xref: /openbmc/linux/arch/ia64/kernel/ivt.S (revision 8bd1369b)
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * arch/ia64/kernel/ivt.S
4 *
5 * Copyright (C) 1998-2001, 2003, 2005 Hewlett-Packard Co
6 *	Stephane Eranian <eranian@hpl.hp.com>
7 *	David Mosberger <davidm@hpl.hp.com>
8 * Copyright (C) 2000, 2002-2003 Intel Co
9 *	Asit Mallick <asit.k.mallick@intel.com>
10 *      Suresh Siddha <suresh.b.siddha@intel.com>
11 *      Kenneth Chen <kenneth.w.chen@intel.com>
12 *      Fenghua Yu <fenghua.yu@intel.com>
13 *
14 * 00/08/23 Asit Mallick <asit.k.mallick@intel.com> TLB handling for SMP
15 * 00/12/20 David Mosberger-Tang <davidm@hpl.hp.com> DTLB/ITLB handler now uses virtual PT.
16 *
17 * Copyright (C) 2005 Hewlett-Packard Co
18 *	Dan Magenheimer <dan.magenheimer@hp.com>
19 *      Xen paravirtualization
20 * Copyright (c) 2008 Isaku Yamahata <yamahata at valinux co jp>
21 *                    VA Linux Systems Japan K.K.
22 *                    pv_ops.
23 *      Yaozu (Eddie) Dong <eddie.dong@intel.com>
24 */
25/*
26 * This file defines the interruption vector table used by the CPU.
27 * It does not include one entry per possible cause of interruption.
28 *
29 * The first 20 entries of the table contain 64 bundles each while the
30 * remaining 48 entries contain only 16 bundles each.
31 *
32 * The 64 bundles are used to allow inlining the whole handler for critical
33 * interruptions like TLB misses.
34 *
35 *  For each entry, the comment is as follows:
36 *
37 *		// 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
38 *  entry offset ----/     /         /                  /          /
39 *  entry number ---------/         /                  /          /
40 *  size of the entry -------------/                  /          /
41 *  vector name -------------------------------------/          /
42 *  interruptions triggering this vector ----------------------/
43 *
44 * The table is 32KB in size and must be aligned on 32KB boundary.
45 * (The CPU ignores the 15 lower bits of the address)
46 *
47 * Table is based upon EAS2.6 (Oct 1999)
48 */
49
50
51#include <asm/asmmacro.h>
52#include <asm/break.h>
53#include <asm/kregs.h>
54#include <asm/asm-offsets.h>
55#include <asm/pgtable.h>
56#include <asm/processor.h>
57#include <asm/ptrace.h>
58#include <asm/thread_info.h>
59#include <asm/unistd.h>
60#include <asm/errno.h>
61#include <asm/export.h>
62
63#if 0
64# define PSR_DEFAULT_BITS	psr.ac
65#else
66# define PSR_DEFAULT_BITS	0
67#endif
68
69#if 0
70  /*
71   * This lets you track the last eight faults that occurred on the CPU.  Make sure ar.k2 isn't
72   * needed for something else before enabling this...
73   */
74# define DBG_FAULT(i)	mov r16=ar.k2;;	shl r16=r16,8;;	add r16=(i),r16;;mov ar.k2=r16
75#else
76# define DBG_FAULT(i)
77#endif
78
79#include "minstate.h"
80
81#define FAULT(n)									\
82	mov r31=pr;									\
83	mov r19=n;;			/* prepare to save predicates */		\
84	br.sptk.many dispatch_to_fault_handler
85
86	.section .text..ivt,"ax"
87
88	.align 32768	// align on 32KB boundary
89	.global ia64_ivt
90	EXPORT_DATA_SYMBOL(ia64_ivt)
91ia64_ivt:
92/////////////////////////////////////////////////////////////////////////////////////////
93// 0x0000 Entry 0 (size 64 bundles) VHPT Translation (8,20,47)
94ENTRY(vhpt_miss)
95	DBG_FAULT(0)
96	/*
97	 * The VHPT vector is invoked when the TLB entry for the virtual page table
98	 * is missing.  This happens only as a result of a previous
99	 * (the "original") TLB miss, which may either be caused by an instruction
100	 * fetch or a data access (or non-access).
101	 *
102	 * What we do here is normal TLB miss handing for the _original_ miss,
103	 * followed by inserting the TLB entry for the virtual page table page
104	 * that the VHPT walker was attempting to access.  The latter gets
105	 * inserted as long as page table entry above pte level have valid
106	 * mappings for the faulting address.  The TLB entry for the original
107	 * miss gets inserted only if the pte entry indicates that the page is
108	 * present.
109	 *
110	 * do_page_fault gets invoked in the following cases:
111	 *	- the faulting virtual address uses unimplemented address bits
112	 *	- the faulting virtual address has no valid page table mapping
113	 */
114	MOV_FROM_IFA(r16)			// get address that caused the TLB miss
115#ifdef CONFIG_HUGETLB_PAGE
116	movl r18=PAGE_SHIFT
117	MOV_FROM_ITIR(r25)
118#endif
119	;;
120	RSM_PSR_DT				// use physical addressing for data
121	mov r31=pr				// save the predicate registers
122	mov r19=IA64_KR(PT_BASE)		// get page table base address
123	shl r21=r16,3				// shift bit 60 into sign bit
124	shr.u r17=r16,61			// get the region number into r17
125	;;
126	shr.u r22=r21,3
127#ifdef CONFIG_HUGETLB_PAGE
128	extr.u r26=r25,2,6
129	;;
130	cmp.ne p8,p0=r18,r26
131	sub r27=r26,r18
132	;;
133(p8)	dep r25=r18,r25,2,6
134(p8)	shr r22=r22,r27
135#endif
136	;;
137	cmp.eq p6,p7=5,r17			// is IFA pointing into to region 5?
138	shr.u r18=r22,PGDIR_SHIFT		// get bottom portion of pgd index bit
139	;;
140(p7)	dep r17=r17,r19,(PAGE_SHIFT-3),3	// put region number bits in place
141
142	srlz.d
143	LOAD_PHYSICAL(p6, r19, swapper_pg_dir)	// region 5 is rooted at swapper_pg_dir
144
145	.pred.rel "mutex", p6, p7
146(p6)	shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
147(p7)	shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
148	;;
149(p6)	dep r17=r18,r19,3,(PAGE_SHIFT-3)	// r17=pgd_offset for region 5
150(p7)	dep r17=r18,r17,3,(PAGE_SHIFT-6)	// r17=pgd_offset for region[0-4]
151	cmp.eq p7,p6=0,r21			// unused address bits all zeroes?
152#if CONFIG_PGTABLE_LEVELS == 4
153	shr.u r28=r22,PUD_SHIFT			// shift pud index into position
154#else
155	shr.u r18=r22,PMD_SHIFT			// shift pmd index into position
156#endif
157	;;
158	ld8 r17=[r17]				// get *pgd (may be 0)
159	;;
160(p7)	cmp.eq p6,p7=r17,r0			// was pgd_present(*pgd) == NULL?
161#if CONFIG_PGTABLE_LEVELS == 4
162	dep r28=r28,r17,3,(PAGE_SHIFT-3)	// r28=pud_offset(pgd,addr)
163	;;
164	shr.u r18=r22,PMD_SHIFT			// shift pmd index into position
165(p7)	ld8 r29=[r28]				// get *pud (may be 0)
166	;;
167(p7)	cmp.eq.or.andcm p6,p7=r29,r0		// was pud_present(*pud) == NULL?
168	dep r17=r18,r29,3,(PAGE_SHIFT-3)	// r17=pmd_offset(pud,addr)
169#else
170	dep r17=r18,r17,3,(PAGE_SHIFT-3)	// r17=pmd_offset(pgd,addr)
171#endif
172	;;
173(p7)	ld8 r20=[r17]				// get *pmd (may be 0)
174	shr.u r19=r22,PAGE_SHIFT		// shift pte index into position
175	;;
176(p7)	cmp.eq.or.andcm p6,p7=r20,r0		// was pmd_present(*pmd) == NULL?
177	dep r21=r19,r20,3,(PAGE_SHIFT-3)	// r21=pte_offset(pmd,addr)
178	;;
179(p7)	ld8 r18=[r21]				// read *pte
180	MOV_FROM_ISR(r19)			// cr.isr bit 32 tells us if this is an insn miss
181	;;
182(p7)	tbit.z p6,p7=r18,_PAGE_P_BIT		// page present bit cleared?
183	MOV_FROM_IHA(r22)			// get the VHPT address that caused the TLB miss
184	;;					// avoid RAW on p7
185(p7)	tbit.nz.unc p10,p11=r19,32		// is it an instruction TLB miss?
186	dep r23=0,r20,0,PAGE_SHIFT		// clear low bits to get page address
187	;;
188	ITC_I_AND_D(p10, p11, r18, r24)		// insert the instruction TLB entry and
189						// insert the data TLB entry
190(p6)	br.cond.spnt.many page_fault		// handle bad address/page not present (page fault)
191	MOV_TO_IFA(r22, r24)
192
193#ifdef CONFIG_HUGETLB_PAGE
194	MOV_TO_ITIR(p8, r25, r24)		// change to default page-size for VHPT
195#endif
196
197	/*
198	 * Now compute and insert the TLB entry for the virtual page table.  We never
199	 * execute in a page table page so there is no need to set the exception deferral
200	 * bit.
201	 */
202	adds r24=__DIRTY_BITS_NO_ED|_PAGE_PL_0|_PAGE_AR_RW,r23
203	;;
204	ITC_D(p7, r24, r25)
205	;;
206#ifdef CONFIG_SMP
207	/*
208	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
209	 * cannot possibly affect the following loads:
210	 */
211	dv_serialize_data
212
213	/*
214	 * Re-check pagetable entry.  If they changed, we may have received a ptc.g
215	 * between reading the pagetable and the "itc".  If so, flush the entry we
216	 * inserted and retry.  At this point, we have:
217	 *
218	 * r28 = equivalent of pud_offset(pgd, ifa)
219	 * r17 = equivalent of pmd_offset(pud, ifa)
220	 * r21 = equivalent of pte_offset(pmd, ifa)
221	 *
222	 * r29 = *pud
223	 * r20 = *pmd
224	 * r18 = *pte
225	 */
226	ld8 r25=[r21]				// read *pte again
227	ld8 r26=[r17]				// read *pmd again
228#if CONFIG_PGTABLE_LEVELS == 4
229	ld8 r19=[r28]				// read *pud again
230#endif
231	cmp.ne p6,p7=r0,r0
232	;;
233	cmp.ne.or.andcm p6,p7=r26,r20		// did *pmd change
234#if CONFIG_PGTABLE_LEVELS == 4
235	cmp.ne.or.andcm p6,p7=r19,r29		// did *pud change
236#endif
237	mov r27=PAGE_SHIFT<<2
238	;;
239(p6)	ptc.l r22,r27				// purge PTE page translation
240(p7)	cmp.ne.or.andcm p6,p7=r25,r18		// did *pte change
241	;;
242(p6)	ptc.l r16,r27				// purge translation
243#endif
244
245	mov pr=r31,-1				// restore predicate registers
246	RFI
247END(vhpt_miss)
248
249	.org ia64_ivt+0x400
250/////////////////////////////////////////////////////////////////////////////////////////
251// 0x0400 Entry 1 (size 64 bundles) ITLB (21)
252ENTRY(itlb_miss)
253	DBG_FAULT(1)
254	/*
255	 * The ITLB handler accesses the PTE via the virtually mapped linear
256	 * page table.  If a nested TLB miss occurs, we switch into physical
257	 * mode, walk the page table, and then re-execute the PTE read and
258	 * go on normally after that.
259	 */
260	MOV_FROM_IFA(r16)			// get virtual address
261	mov r29=b0				// save b0
262	mov r31=pr				// save predicates
263.itlb_fault:
264	MOV_FROM_IHA(r17)			// get virtual address of PTE
265	movl r30=1f				// load nested fault continuation point
266	;;
2671:	ld8 r18=[r17]				// read *pte
268	;;
269	mov b0=r29
270	tbit.z p6,p0=r18,_PAGE_P_BIT		// page present bit cleared?
271(p6)	br.cond.spnt page_fault
272	;;
273	ITC_I(p0, r18, r19)
274	;;
275#ifdef CONFIG_SMP
276	/*
277	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
278	 * cannot possibly affect the following loads:
279	 */
280	dv_serialize_data
281
282	ld8 r19=[r17]				// read *pte again and see if same
283	mov r20=PAGE_SHIFT<<2			// setup page size for purge
284	;;
285	cmp.ne p7,p0=r18,r19
286	;;
287(p7)	ptc.l r16,r20
288#endif
289	mov pr=r31,-1
290	RFI
291END(itlb_miss)
292
293	.org ia64_ivt+0x0800
294/////////////////////////////////////////////////////////////////////////////////////////
295// 0x0800 Entry 2 (size 64 bundles) DTLB (9,48)
296ENTRY(dtlb_miss)
297	DBG_FAULT(2)
298	/*
299	 * The DTLB handler accesses the PTE via the virtually mapped linear
300	 * page table.  If a nested TLB miss occurs, we switch into physical
301	 * mode, walk the page table, and then re-execute the PTE read and
302	 * go on normally after that.
303	 */
304	MOV_FROM_IFA(r16)			// get virtual address
305	mov r29=b0				// save b0
306	mov r31=pr				// save predicates
307dtlb_fault:
308	MOV_FROM_IHA(r17)			// get virtual address of PTE
309	movl r30=1f				// load nested fault continuation point
310	;;
3111:	ld8 r18=[r17]				// read *pte
312	;;
313	mov b0=r29
314	tbit.z p6,p0=r18,_PAGE_P_BIT		// page present bit cleared?
315(p6)	br.cond.spnt page_fault
316	;;
317	ITC_D(p0, r18, r19)
318	;;
319#ifdef CONFIG_SMP
320	/*
321	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
322	 * cannot possibly affect the following loads:
323	 */
324	dv_serialize_data
325
326	ld8 r19=[r17]				// read *pte again and see if same
327	mov r20=PAGE_SHIFT<<2			// setup page size for purge
328	;;
329	cmp.ne p7,p0=r18,r19
330	;;
331(p7)	ptc.l r16,r20
332#endif
333	mov pr=r31,-1
334	RFI
335END(dtlb_miss)
336
337	.org ia64_ivt+0x0c00
338/////////////////////////////////////////////////////////////////////////////////////////
339// 0x0c00 Entry 3 (size 64 bundles) Alt ITLB (19)
340ENTRY(alt_itlb_miss)
341	DBG_FAULT(3)
342	MOV_FROM_IFA(r16)	// get address that caused the TLB miss
343	movl r17=PAGE_KERNEL
344	MOV_FROM_IPSR(p0, r21)
345	movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
346	mov r31=pr
347	;;
348#ifdef CONFIG_DISABLE_VHPT
349	shr.u r22=r16,61			// get the region number into r21
350	;;
351	cmp.gt p8,p0=6,r22			// user mode
352	;;
353	THASH(p8, r17, r16, r23)
354	;;
355	MOV_TO_IHA(p8, r17, r23)
356(p8)	mov r29=b0				// save b0
357(p8)	br.cond.dptk .itlb_fault
358#endif
359	extr.u r23=r21,IA64_PSR_CPL0_BIT,2	// extract psr.cpl
360	and r19=r19,r16		// clear ed, reserved bits, and PTE control bits
361	shr.u r18=r16,57	// move address bit 61 to bit 4
362	;;
363	andcm r18=0x10,r18	// bit 4=~address-bit(61)
364	cmp.ne p8,p0=r0,r23	// psr.cpl != 0?
365	or r19=r17,r19		// insert PTE control bits into r19
366	;;
367	or r19=r19,r18		// set bit 4 (uncached) if the access was to region 6
368(p8)	br.cond.spnt page_fault
369	;;
370	ITC_I(p0, r19, r18)	// insert the TLB entry
371	mov pr=r31,-1
372	RFI
373END(alt_itlb_miss)
374
375	.org ia64_ivt+0x1000
376/////////////////////////////////////////////////////////////////////////////////////////
377// 0x1000 Entry 4 (size 64 bundles) Alt DTLB (7,46)
378ENTRY(alt_dtlb_miss)
379	DBG_FAULT(4)
380	MOV_FROM_IFA(r16)	// get address that caused the TLB miss
381	movl r17=PAGE_KERNEL
382	MOV_FROM_ISR(r20)
383	movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
384	MOV_FROM_IPSR(p0, r21)
385	mov r31=pr
386	mov r24=PERCPU_ADDR
387	;;
388#ifdef CONFIG_DISABLE_VHPT
389	shr.u r22=r16,61			// get the region number into r21
390	;;
391	cmp.gt p8,p0=6,r22			// access to region 0-5
392	;;
393	THASH(p8, r17, r16, r25)
394	;;
395	MOV_TO_IHA(p8, r17, r25)
396(p8)	mov r29=b0				// save b0
397(p8)	br.cond.dptk dtlb_fault
398#endif
399	cmp.ge p10,p11=r16,r24			// access to per_cpu_data?
400	tbit.z p12,p0=r16,61			// access to region 6?
401	mov r25=PERCPU_PAGE_SHIFT << 2
402	mov r26=PERCPU_PAGE_SIZE
403	nop.m 0
404	nop.b 0
405	;;
406(p10)	mov r19=IA64_KR(PER_CPU_DATA)
407(p11)	and r19=r19,r16				// clear non-ppn fields
408	extr.u r23=r21,IA64_PSR_CPL0_BIT,2	// extract psr.cpl
409	and r22=IA64_ISR_CODE_MASK,r20		// get the isr.code field
410	tbit.nz p6,p7=r20,IA64_ISR_SP_BIT	// is speculation bit on?
411	tbit.nz p9,p0=r20,IA64_ISR_NA_BIT	// is non-access bit on?
412	;;
413(p10)	sub r19=r19,r26
414	MOV_TO_ITIR(p10, r25, r24)
415	cmp.ne p8,p0=r0,r23
416(p9)	cmp.eq.or.andcm p6,p7=IA64_ISR_CODE_LFETCH,r22	// check isr.code field
417(p12)	dep r17=-1,r17,4,1			// set ma=UC for region 6 addr
418(p8)	br.cond.spnt page_fault
419
420	dep r21=-1,r21,IA64_PSR_ED_BIT,1
421	;;
422	or r19=r19,r17		// insert PTE control bits into r19
423	MOV_TO_IPSR(p6, r21, r24)
424	;;
425	ITC_D(p7, r19, r18)	// insert the TLB entry
426	mov pr=r31,-1
427	RFI
428END(alt_dtlb_miss)
429
430	.org ia64_ivt+0x1400
431/////////////////////////////////////////////////////////////////////////////////////////
432// 0x1400 Entry 5 (size 64 bundles) Data nested TLB (6,45)
433ENTRY(nested_dtlb_miss)
434	/*
435	 * In the absence of kernel bugs, we get here when the virtually mapped linear
436	 * page table is accessed non-speculatively (e.g., in the Dirty-bit, Instruction
437	 * Access-bit, or Data Access-bit faults).  If the DTLB entry for the virtual page
438	 * table is missing, a nested TLB miss fault is triggered and control is
439	 * transferred to this point.  When this happens, we lookup the pte for the
440	 * faulting address by walking the page table in physical mode and return to the
441	 * continuation point passed in register r30 (or call page_fault if the address is
442	 * not mapped).
443	 *
444	 * Input:	r16:	faulting address
445	 *		r29:	saved b0
446	 *		r30:	continuation address
447	 *		r31:	saved pr
448	 *
449	 * Output:	r17:	physical address of PTE of faulting address
450	 *		r29:	saved b0
451	 *		r30:	continuation address
452	 *		r31:	saved pr
453	 *
454	 * Clobbered:	b0, r18, r19, r21, r22, psr.dt (cleared)
455	 */
456	RSM_PSR_DT				// switch to using physical data addressing
457	mov r19=IA64_KR(PT_BASE)		// get the page table base address
458	shl r21=r16,3				// shift bit 60 into sign bit
459	MOV_FROM_ITIR(r18)
460	;;
461	shr.u r17=r16,61			// get the region number into r17
462	extr.u r18=r18,2,6			// get the faulting page size
463	;;
464	cmp.eq p6,p7=5,r17			// is faulting address in region 5?
465	add r22=-PAGE_SHIFT,r18			// adjustment for hugetlb address
466	add r18=PGDIR_SHIFT-PAGE_SHIFT,r18
467	;;
468	shr.u r22=r16,r22
469	shr.u r18=r16,r18
470(p7)	dep r17=r17,r19,(PAGE_SHIFT-3),3	// put region number bits in place
471
472	srlz.d
473	LOAD_PHYSICAL(p6, r19, swapper_pg_dir)	// region 5 is rooted at swapper_pg_dir
474
475	.pred.rel "mutex", p6, p7
476(p6)	shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
477(p7)	shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
478	;;
479(p6)	dep r17=r18,r19,3,(PAGE_SHIFT-3)	// r17=pgd_offset for region 5
480(p7)	dep r17=r18,r17,3,(PAGE_SHIFT-6)	// r17=pgd_offset for region[0-4]
481	cmp.eq p7,p6=0,r21			// unused address bits all zeroes?
482#if CONFIG_PGTABLE_LEVELS == 4
483	shr.u r18=r22,PUD_SHIFT			// shift pud index into position
484#else
485	shr.u r18=r22,PMD_SHIFT			// shift pmd index into position
486#endif
487	;;
488	ld8 r17=[r17]				// get *pgd (may be 0)
489	;;
490(p7)	cmp.eq p6,p7=r17,r0			// was pgd_present(*pgd) == NULL?
491	dep r17=r18,r17,3,(PAGE_SHIFT-3)	// r17=p[u|m]d_offset(pgd,addr)
492	;;
493#if CONFIG_PGTABLE_LEVELS == 4
494(p7)	ld8 r17=[r17]				// get *pud (may be 0)
495	shr.u r18=r22,PMD_SHIFT			// shift pmd index into position
496	;;
497(p7)	cmp.eq.or.andcm p6,p7=r17,r0		// was pud_present(*pud) == NULL?
498	dep r17=r18,r17,3,(PAGE_SHIFT-3)	// r17=pmd_offset(pud,addr)
499	;;
500#endif
501(p7)	ld8 r17=[r17]				// get *pmd (may be 0)
502	shr.u r19=r22,PAGE_SHIFT		// shift pte index into position
503	;;
504(p7)	cmp.eq.or.andcm p6,p7=r17,r0		// was pmd_present(*pmd) == NULL?
505	dep r17=r19,r17,3,(PAGE_SHIFT-3)	// r17=pte_offset(pmd,addr);
506(p6)	br.cond.spnt page_fault
507	mov b0=r30
508	br.sptk.many b0				// return to continuation point
509END(nested_dtlb_miss)
510
511	.org ia64_ivt+0x1800
512/////////////////////////////////////////////////////////////////////////////////////////
513// 0x1800 Entry 6 (size 64 bundles) Instruction Key Miss (24)
514ENTRY(ikey_miss)
515	DBG_FAULT(6)
516	FAULT(6)
517END(ikey_miss)
518
519	.org ia64_ivt+0x1c00
520/////////////////////////////////////////////////////////////////////////////////////////
521// 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
522ENTRY(dkey_miss)
523	DBG_FAULT(7)
524	FAULT(7)
525END(dkey_miss)
526
527	.org ia64_ivt+0x2000
528/////////////////////////////////////////////////////////////////////////////////////////
529// 0x2000 Entry 8 (size 64 bundles) Dirty-bit (54)
530ENTRY(dirty_bit)
531	DBG_FAULT(8)
532	/*
533	 * What we do here is to simply turn on the dirty bit in the PTE.  We need to
534	 * update both the page-table and the TLB entry.  To efficiently access the PTE,
535	 * we address it through the virtual page table.  Most likely, the TLB entry for
536	 * the relevant virtual page table page is still present in the TLB so we can
537	 * normally do this without additional TLB misses.  In case the necessary virtual
538	 * page table TLB entry isn't present, we take a nested TLB miss hit where we look
539	 * up the physical address of the L3 PTE and then continue at label 1 below.
540	 */
541	MOV_FROM_IFA(r16)			// get the address that caused the fault
542	movl r30=1f				// load continuation point in case of nested fault
543	;;
544	THASH(p0, r17, r16, r18)		// compute virtual address of L3 PTE
545	mov r29=b0				// save b0 in case of nested fault
546	mov r31=pr				// save pr
547#ifdef CONFIG_SMP
548	mov r28=ar.ccv				// save ar.ccv
549	;;
5501:	ld8 r18=[r17]
551	;;					// avoid RAW on r18
552	mov ar.ccv=r18				// set compare value for cmpxchg
553	or r25=_PAGE_D|_PAGE_A,r18		// set the dirty and accessed bits
554	tbit.z p7,p6 = r18,_PAGE_P_BIT		// Check present bit
555	;;
556(p6)	cmpxchg8.acq r26=[r17],r25,ar.ccv	// Only update if page is present
557	mov r24=PAGE_SHIFT<<2
558	;;
559(p6)	cmp.eq p6,p7=r26,r18			// Only compare if page is present
560	;;
561	ITC_D(p6, r25, r18)			// install updated PTE
562	;;
563	/*
564	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
565	 * cannot possibly affect the following loads:
566	 */
567	dv_serialize_data
568
569	ld8 r18=[r17]				// read PTE again
570	;;
571	cmp.eq p6,p7=r18,r25			// is it same as the newly installed
572	;;
573(p7)	ptc.l r16,r24
574	mov b0=r29				// restore b0
575	mov ar.ccv=r28
576#else
577	;;
5781:	ld8 r18=[r17]
579	;;					// avoid RAW on r18
580	or r18=_PAGE_D|_PAGE_A,r18		// set the dirty and accessed bits
581	mov b0=r29				// restore b0
582	;;
583	st8 [r17]=r18				// store back updated PTE
584	ITC_D(p0, r18, r16)			// install updated PTE
585#endif
586	mov pr=r31,-1				// restore pr
587	RFI
588END(dirty_bit)
589
590	.org ia64_ivt+0x2400
591/////////////////////////////////////////////////////////////////////////////////////////
592// 0x2400 Entry 9 (size 64 bundles) Instruction Access-bit (27)
593ENTRY(iaccess_bit)
594	DBG_FAULT(9)
595	// Like Entry 8, except for instruction access
596	MOV_FROM_IFA(r16)			// get the address that caused the fault
597	movl r30=1f				// load continuation point in case of nested fault
598	mov r31=pr				// save predicates
599#ifdef CONFIG_ITANIUM
600	/*
601	 * Erratum 10 (IFA may contain incorrect address) has "NoFix" status.
602	 */
603	MOV_FROM_IPSR(p0, r17)
604	;;
605	MOV_FROM_IIP(r18)
606	tbit.z p6,p0=r17,IA64_PSR_IS_BIT	// IA64 instruction set?
607	;;
608(p6)	mov r16=r18				// if so, use cr.iip instead of cr.ifa
609#endif /* CONFIG_ITANIUM */
610	;;
611	THASH(p0, r17, r16, r18)		// compute virtual address of L3 PTE
612	mov r29=b0				// save b0 in case of nested fault)
613#ifdef CONFIG_SMP
614	mov r28=ar.ccv				// save ar.ccv
615	;;
6161:	ld8 r18=[r17]
617	;;
618	mov ar.ccv=r18				// set compare value for cmpxchg
619	or r25=_PAGE_A,r18			// set the accessed bit
620	tbit.z p7,p6 = r18,_PAGE_P_BIT	 	// Check present bit
621	;;
622(p6)	cmpxchg8.acq r26=[r17],r25,ar.ccv	// Only if page present
623	mov r24=PAGE_SHIFT<<2
624	;;
625(p6)	cmp.eq p6,p7=r26,r18			// Only if page present
626	;;
627	ITC_I(p6, r25, r26)			// install updated PTE
628	;;
629	/*
630	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
631	 * cannot possibly affect the following loads:
632	 */
633	dv_serialize_data
634
635	ld8 r18=[r17]				// read PTE again
636	;;
637	cmp.eq p6,p7=r18,r25			// is it same as the newly installed
638	;;
639(p7)	ptc.l r16,r24
640	mov b0=r29				// restore b0
641	mov ar.ccv=r28
642#else /* !CONFIG_SMP */
643	;;
6441:	ld8 r18=[r17]
645	;;
646	or r18=_PAGE_A,r18			// set the accessed bit
647	mov b0=r29				// restore b0
648	;;
649	st8 [r17]=r18				// store back updated PTE
650	ITC_I(p0, r18, r16)			// install updated PTE
651#endif /* !CONFIG_SMP */
652	mov pr=r31,-1
653	RFI
654END(iaccess_bit)
655
656	.org ia64_ivt+0x2800
657/////////////////////////////////////////////////////////////////////////////////////////
658// 0x2800 Entry 10 (size 64 bundles) Data Access-bit (15,55)
659ENTRY(daccess_bit)
660	DBG_FAULT(10)
661	// Like Entry 8, except for data access
662	MOV_FROM_IFA(r16)			// get the address that caused the fault
663	movl r30=1f				// load continuation point in case of nested fault
664	;;
665	THASH(p0, r17, r16, r18)		// compute virtual address of L3 PTE
666	mov r31=pr
667	mov r29=b0				// save b0 in case of nested fault)
668#ifdef CONFIG_SMP
669	mov r28=ar.ccv				// save ar.ccv
670	;;
6711:	ld8 r18=[r17]
672	;;					// avoid RAW on r18
673	mov ar.ccv=r18				// set compare value for cmpxchg
674	or r25=_PAGE_A,r18			// set the dirty bit
675	tbit.z p7,p6 = r18,_PAGE_P_BIT		// Check present bit
676	;;
677(p6)	cmpxchg8.acq r26=[r17],r25,ar.ccv	// Only if page is present
678	mov r24=PAGE_SHIFT<<2
679	;;
680(p6)	cmp.eq p6,p7=r26,r18			// Only if page is present
681	;;
682	ITC_D(p6, r25, r26)			// install updated PTE
683	/*
684	 * Tell the assemblers dependency-violation checker that the above "itc" instructions
685	 * cannot possibly affect the following loads:
686	 */
687	dv_serialize_data
688	;;
689	ld8 r18=[r17]				// read PTE again
690	;;
691	cmp.eq p6,p7=r18,r25			// is it same as the newly installed
692	;;
693(p7)	ptc.l r16,r24
694	mov ar.ccv=r28
695#else
696	;;
6971:	ld8 r18=[r17]
698	;;					// avoid RAW on r18
699	or r18=_PAGE_A,r18			// set the accessed bit
700	;;
701	st8 [r17]=r18				// store back updated PTE
702	ITC_D(p0, r18, r16)			// install updated PTE
703#endif
704	mov b0=r29				// restore b0
705	mov pr=r31,-1
706	RFI
707END(daccess_bit)
708
709	.org ia64_ivt+0x2c00
710/////////////////////////////////////////////////////////////////////////////////////////
711// 0x2c00 Entry 11 (size 64 bundles) Break instruction (33)
712ENTRY(break_fault)
713	/*
714	 * The streamlined system call entry/exit paths only save/restore the initial part
715	 * of pt_regs.  This implies that the callers of system-calls must adhere to the
716	 * normal procedure calling conventions.
717	 *
718	 *   Registers to be saved & restored:
719	 *	CR registers: cr.ipsr, cr.iip, cr.ifs
720	 *	AR registers: ar.unat, ar.pfs, ar.rsc, ar.rnat, ar.bspstore, ar.fpsr
721	 * 	others: pr, b0, b6, loadrs, r1, r11, r12, r13, r15
722	 *   Registers to be restored only:
723	 * 	r8-r11: output value from the system call.
724	 *
725	 * During system call exit, scratch registers (including r15) are modified/cleared
726	 * to prevent leaking bits from kernel to user level.
727	 */
728	DBG_FAULT(11)
729	mov.m r16=IA64_KR(CURRENT)		// M2 r16 <- current task (12 cyc)
730	MOV_FROM_IPSR(p0, r29)			// M2 (12 cyc)
731	mov r31=pr				// I0 (2 cyc)
732
733	MOV_FROM_IIM(r17)			// M2 (2 cyc)
734	mov.m r27=ar.rsc			// M2 (12 cyc)
735	mov r18=__IA64_BREAK_SYSCALL		// A
736
737	mov.m ar.rsc=0				// M2
738	mov.m r21=ar.fpsr			// M2 (12 cyc)
739	mov r19=b6				// I0 (2 cyc)
740	;;
741	mov.m r23=ar.bspstore			// M2 (12 cyc)
742	mov.m r24=ar.rnat			// M2 (5 cyc)
743	mov.i r26=ar.pfs			// I0 (2 cyc)
744
745	invala					// M0|1
746	nop.m 0					// M
747	mov r20=r1				// A			save r1
748
749	nop.m 0
750	movl r30=sys_call_table			// X
751
752	MOV_FROM_IIP(r28)			// M2 (2 cyc)
753	cmp.eq p0,p7=r18,r17			// I0 is this a system call?
754(p7)	br.cond.spnt non_syscall		// B  no ->
755	//
756	// From this point on, we are definitely on the syscall-path
757	// and we can use (non-banked) scratch registers.
758	//
759///////////////////////////////////////////////////////////////////////
760	mov r1=r16				// A    move task-pointer to "addl"-addressable reg
761	mov r2=r16				// A    setup r2 for ia64_syscall_setup
762	add r9=TI_FLAGS+IA64_TASK_SIZE,r16	// A	r9 = &current_thread_info()->flags
763
764	adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16
765	adds r15=-1024,r15			// A    subtract 1024 from syscall number
766	mov r3=NR_syscalls - 1
767	;;
768	ld1.bias r17=[r16]			// M0|1 r17 = current->thread.on_ustack flag
769	ld4 r9=[r9]				// M0|1 r9 = current_thread_info()->flags
770	extr.u r8=r29,41,2			// I0   extract ei field from cr.ipsr
771
772	shladd r30=r15,3,r30			// A    r30 = sys_call_table + 8*(syscall-1024)
773	addl r22=IA64_RBS_OFFSET,r1		// A    compute base of RBS
774	cmp.leu p6,p7=r15,r3			// A    syscall number in range?
775	;;
776
777	lfetch.fault.excl.nt1 [r22]		// M0|1 prefetch RBS
778(p6)	ld8 r30=[r30]				// M0|1 load address of syscall entry point
779	tnat.nz.or p7,p0=r15			// I0	is syscall nr a NaT?
780
781	mov.m ar.bspstore=r22			// M2   switch to kernel RBS
782	cmp.eq p8,p9=2,r8			// A    isr.ei==2?
783	;;
784
785(p8)	mov r8=0				// A    clear ei to 0
786(p7)	movl r30=sys_ni_syscall			// X
787
788(p8)	adds r28=16,r28				// A    switch cr.iip to next bundle
789(p9)	adds r8=1,r8				// A    increment ei to next slot
790#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
791	;;
792	mov b6=r30				// I0   setup syscall handler branch reg early
793#else
794	nop.i 0
795	;;
796#endif
797
798	mov.m r25=ar.unat			// M2 (5 cyc)
799	dep r29=r8,r29,41,2			// I0   insert new ei into cr.ipsr
800	adds r15=1024,r15			// A    restore original syscall number
801	//
802	// If any of the above loads miss in L1D, we'll stall here until
803	// the data arrives.
804	//
805///////////////////////////////////////////////////////////////////////
806	st1 [r16]=r0				// M2|3 clear current->thread.on_ustack flag
807#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
808	MOV_FROM_ITC(p0, p14, r30, r18)		// M    get cycle for accounting
809#else
810	mov b6=r30				// I0   setup syscall handler branch reg early
811#endif
812	cmp.eq pKStk,pUStk=r0,r17		// A    were we on kernel stacks already?
813
814	and r9=_TIF_SYSCALL_TRACEAUDIT,r9	// A    mask trace or audit
815	mov r18=ar.bsp				// M2 (12 cyc)
816(pKStk)	br.cond.spnt .break_fixup		// B	we're already in kernel-mode -- fix up RBS
817	;;
818.back_from_break_fixup:
819(pUStk)	addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1 // A    compute base of memory stack
820	cmp.eq p14,p0=r9,r0			// A    are syscalls being traced/audited?
821	br.call.sptk.many b7=ia64_syscall_setup	// B
8221:
823#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
824	// mov.m r30=ar.itc is called in advance, and r13 is current
825	add r16=TI_AC_STAMP+IA64_TASK_SIZE,r13	// A
826	add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r13	// A
827(pKStk)	br.cond.spnt .skip_accounting		// B	unlikely skip
828	;;
829	ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP	// M  get last stamp
830	ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE	// M  time at leave
831	;;
832	ld8 r20=[r16],TI_AC_STAMP-TI_AC_STIME	// M  cumulated stime
833	ld8 r21=[r17]				// M  cumulated utime
834	sub r22=r19,r18				// A  stime before leave
835	;;
836	st8 [r16]=r30,TI_AC_STIME-TI_AC_STAMP	// M  update stamp
837	sub r18=r30,r19				// A  elapsed time in user
838	;;
839	add r20=r20,r22				// A  sum stime
840	add r21=r21,r18				// A  sum utime
841	;;
842	st8 [r16]=r20				// M  update stime
843	st8 [r17]=r21				// M  update utime
844	;;
845.skip_accounting:
846#endif
847	mov ar.rsc=0x3				// M2   set eager mode, pl 0, LE, loadrs=0
848	nop 0
849	BSW_1(r2, r14)				// B (6 cyc) regs are saved, switch to bank 1
850	;;
851
852	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r16)	// M2	now it's safe to re-enable intr.-collection
853						// M0   ensure interruption collection is on
854	movl r3=ia64_ret_from_syscall		// X
855	;;
856	mov rp=r3				// I0   set the real return addr
857(p10)	br.cond.spnt.many ia64_ret_from_syscall	// B    return if bad call-frame or r15 is a NaT
858
859	SSM_PSR_I(p15, p15, r16)		// M2   restore psr.i
860(p14)	br.call.sptk.many b6=b6			// B    invoke syscall-handker (ignore return addr)
861	br.cond.spnt.many ia64_trace_syscall	// B	do syscall-tracing thingamagic
862	// NOT REACHED
863///////////////////////////////////////////////////////////////////////
864	// On entry, we optimistically assumed that we're coming from user-space.
865	// For the rare cases where a system-call is done from within the kernel,
866	// we fix things up at this point:
867.break_fixup:
868	add r1=-IA64_PT_REGS_SIZE,sp		// A    allocate space for pt_regs structure
869	mov ar.rnat=r24				// M2	restore kernel's AR.RNAT
870	;;
871	mov ar.bspstore=r23			// M2	restore kernel's AR.BSPSTORE
872	br.cond.sptk .back_from_break_fixup
873END(break_fault)
874
875	.org ia64_ivt+0x3000
876/////////////////////////////////////////////////////////////////////////////////////////
877// 0x3000 Entry 12 (size 64 bundles) External Interrupt (4)
878ENTRY(interrupt)
879	/* interrupt handler has become too big to fit this area. */
880	br.sptk.many __interrupt
881END(interrupt)
882
883	.org ia64_ivt+0x3400
884/////////////////////////////////////////////////////////////////////////////////////////
885// 0x3400 Entry 13 (size 64 bundles) Reserved
886	DBG_FAULT(13)
887	FAULT(13)
888
889	.org ia64_ivt+0x3800
890/////////////////////////////////////////////////////////////////////////////////////////
891// 0x3800 Entry 14 (size 64 bundles) Reserved
892	DBG_FAULT(14)
893	FAULT(14)
894
895	/*
896	 * There is no particular reason for this code to be here, other than that
897	 * there happens to be space here that would go unused otherwise.  If this
898	 * fault ever gets "unreserved", simply moved the following code to a more
899	 * suitable spot...
900	 *
901	 * ia64_syscall_setup() is a separate subroutine so that it can
902	 *	allocate stacked registers so it can safely demine any
903	 *	potential NaT values from the input registers.
904	 *
905	 * On entry:
906	 *	- executing on bank 0 or bank 1 register set (doesn't matter)
907	 *	-  r1: stack pointer
908	 *	-  r2: current task pointer
909	 *	-  r3: preserved
910	 *	- r11: original contents (saved ar.pfs to be saved)
911	 *	- r12: original contents (sp to be saved)
912	 *	- r13: original contents (tp to be saved)
913	 *	- r15: original contents (syscall # to be saved)
914	 *	- r18: saved bsp (after switching to kernel stack)
915	 *	- r19: saved b6
916	 *	- r20: saved r1 (gp)
917	 *	- r21: saved ar.fpsr
918	 *	- r22: kernel's register backing store base (krbs_base)
919	 *	- r23: saved ar.bspstore
920	 *	- r24: saved ar.rnat
921	 *	- r25: saved ar.unat
922	 *	- r26: saved ar.pfs
923	 *	- r27: saved ar.rsc
924	 *	- r28: saved cr.iip
925	 *	- r29: saved cr.ipsr
926	 *	- r30: ar.itc for accounting (don't touch)
927	 *	- r31: saved pr
928	 *	-  b0: original contents (to be saved)
929	 * On exit:
930	 *	-  p10: TRUE if syscall is invoked with more than 8 out
931	 *		registers or r15's Nat is true
932	 *	-  r1: kernel's gp
933	 *	-  r3: preserved (same as on entry)
934	 *	-  r8: -EINVAL if p10 is true
935	 *	- r12: points to kernel stack
936	 *	- r13: points to current task
937	 *	- r14: preserved (same as on entry)
938	 *	- p13: preserved
939	 *	- p15: TRUE if interrupts need to be re-enabled
940	 *	- ar.fpsr: set to kernel settings
941	 *	-  b6: preserved (same as on entry)
942	 */
943GLOBAL_ENTRY(ia64_syscall_setup)
944#if PT(B6) != 0
945# error This code assumes that b6 is the first field in pt_regs.
946#endif
947	st8 [r1]=r19				// save b6
948	add r16=PT(CR_IPSR),r1			// initialize first base pointer
949	add r17=PT(R11),r1			// initialize second base pointer
950	;;
951	alloc r19=ar.pfs,8,0,0,0		// ensure in0-in7 are writable
952	st8 [r16]=r29,PT(AR_PFS)-PT(CR_IPSR)	// save cr.ipsr
953	tnat.nz p8,p0=in0
954
955	st8.spill [r17]=r11,PT(CR_IIP)-PT(R11)	// save r11
956	tnat.nz p9,p0=in1
957(pKStk)	mov r18=r0				// make sure r18 isn't NaT
958	;;
959
960	st8 [r16]=r26,PT(CR_IFS)-PT(AR_PFS)	// save ar.pfs
961	st8 [r17]=r28,PT(AR_UNAT)-PT(CR_IIP)	// save cr.iip
962	mov r28=b0				// save b0 (2 cyc)
963	;;
964
965	st8 [r17]=r25,PT(AR_RSC)-PT(AR_UNAT)	// save ar.unat
966	dep r19=0,r19,38,26			// clear all bits but 0..37 [I0]
967(p8)	mov in0=-1
968	;;
969
970	st8 [r16]=r19,PT(AR_RNAT)-PT(CR_IFS)	// store ar.pfs.pfm in cr.ifs
971	extr.u r11=r19,7,7	// I0		// get sol of ar.pfs
972	and r8=0x7f,r19		// A		// get sof of ar.pfs
973
974	st8 [r17]=r27,PT(AR_BSPSTORE)-PT(AR_RSC)// save ar.rsc
975	tbit.nz p15,p0=r29,IA64_PSR_I_BIT // I0
976(p9)	mov in1=-1
977	;;
978
979(pUStk) sub r18=r18,r22				// r18=RSE.ndirty*8
980	tnat.nz p10,p0=in2
981	add r11=8,r11
982	;;
983(pKStk) adds r16=PT(PR)-PT(AR_RNAT),r16		// skip over ar_rnat field
984(pKStk) adds r17=PT(B0)-PT(AR_BSPSTORE),r17	// skip over ar_bspstore field
985	tnat.nz p11,p0=in3
986	;;
987(p10)	mov in2=-1
988	tnat.nz p12,p0=in4				// [I0]
989(p11)	mov in3=-1
990	;;
991(pUStk) st8 [r16]=r24,PT(PR)-PT(AR_RNAT)	// save ar.rnat
992(pUStk) st8 [r17]=r23,PT(B0)-PT(AR_BSPSTORE)	// save ar.bspstore
993	shl r18=r18,16				// compute ar.rsc to be used for "loadrs"
994	;;
995	st8 [r16]=r31,PT(LOADRS)-PT(PR)		// save predicates
996	st8 [r17]=r28,PT(R1)-PT(B0)		// save b0
997	tnat.nz p13,p0=in5				// [I0]
998	;;
999	st8 [r16]=r18,PT(R12)-PT(LOADRS)	// save ar.rsc value for "loadrs"
1000	st8.spill [r17]=r20,PT(R13)-PT(R1)	// save original r1
1001(p12)	mov in4=-1
1002	;;
1003
1004.mem.offset 0,0; st8.spill [r16]=r12,PT(AR_FPSR)-PT(R12)	// save r12
1005.mem.offset 8,0; st8.spill [r17]=r13,PT(R15)-PT(R13)		// save r13
1006(p13)	mov in5=-1
1007	;;
1008	st8 [r16]=r21,PT(R8)-PT(AR_FPSR)	// save ar.fpsr
1009	tnat.nz p13,p0=in6
1010	cmp.lt p10,p9=r11,r8	// frame size can't be more than local+8
1011	;;
1012	mov r8=1
1013(p9)	tnat.nz p10,p0=r15
1014	adds r12=-16,r1		// switch to kernel memory stack (with 16 bytes of scratch)
1015
1016	st8.spill [r17]=r15			// save r15
1017	tnat.nz p8,p0=in7
1018	nop.i 0
1019
1020	mov r13=r2				// establish `current'
1021	movl r1=__gp				// establish kernel global pointer
1022	;;
1023	st8 [r16]=r8		// ensure pt_regs.r8 != 0 (see handle_syscall_error)
1024(p13)	mov in6=-1
1025(p8)	mov in7=-1
1026
1027	cmp.eq pSys,pNonSys=r0,r0		// set pSys=1, pNonSys=0
1028	movl r17=FPSR_DEFAULT
1029	;;
1030	mov.m ar.fpsr=r17			// set ar.fpsr to kernel default value
1031(p10)	mov r8=-EINVAL
1032	br.ret.sptk.many b7
1033END(ia64_syscall_setup)
1034
1035	.org ia64_ivt+0x3c00
1036/////////////////////////////////////////////////////////////////////////////////////////
1037// 0x3c00 Entry 15 (size 64 bundles) Reserved
1038	DBG_FAULT(15)
1039	FAULT(15)
1040
1041	.org ia64_ivt+0x4000
1042/////////////////////////////////////////////////////////////////////////////////////////
1043// 0x4000 Entry 16 (size 64 bundles) Reserved
1044	DBG_FAULT(16)
1045	FAULT(16)
1046
1047#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE)
1048	/*
1049	 * There is no particular reason for this code to be here, other than
1050	 * that there happens to be space here that would go unused otherwise.
1051	 * If this fault ever gets "unreserved", simply moved the following
1052	 * code to a more suitable spot...
1053	 *
1054	 * account_sys_enter is called from SAVE_MIN* macros if accounting is
1055	 * enabled and if the macro is entered from user mode.
1056	 */
1057GLOBAL_ENTRY(account_sys_enter)
1058	// mov.m r20=ar.itc is called in advance, and r13 is current
1059	add r16=TI_AC_STAMP+IA64_TASK_SIZE,r13
1060	add r17=TI_AC_LEAVE+IA64_TASK_SIZE,r13
1061	;;
1062	ld8 r18=[r16],TI_AC_STIME-TI_AC_STAMP	// time at last check in kernel
1063	ld8 r19=[r17],TI_AC_UTIME-TI_AC_LEAVE	// time at left from kernel
1064        ;;
1065	ld8 r23=[r16],TI_AC_STAMP-TI_AC_STIME	// cumulated stime
1066	ld8 r21=[r17]				// cumulated utime
1067	sub r22=r19,r18				// stime before leave kernel
1068	;;
1069	st8 [r16]=r20,TI_AC_STIME-TI_AC_STAMP	// update stamp
1070	sub r18=r20,r19				// elapsed time in user mode
1071	;;
1072	add r23=r23,r22				// sum stime
1073	add r21=r21,r18				// sum utime
1074	;;
1075	st8 [r16]=r23				// update stime
1076	st8 [r17]=r21				// update utime
1077	;;
1078	br.ret.sptk.many rp
1079END(account_sys_enter)
1080#endif
1081
1082	.org ia64_ivt+0x4400
1083/////////////////////////////////////////////////////////////////////////////////////////
1084// 0x4400 Entry 17 (size 64 bundles) Reserved
1085	DBG_FAULT(17)
1086	FAULT(17)
1087
1088	.org ia64_ivt+0x4800
1089/////////////////////////////////////////////////////////////////////////////////////////
1090// 0x4800 Entry 18 (size 64 bundles) Reserved
1091	DBG_FAULT(18)
1092	FAULT(18)
1093
1094	.org ia64_ivt+0x4c00
1095/////////////////////////////////////////////////////////////////////////////////////////
1096// 0x4c00 Entry 19 (size 64 bundles) Reserved
1097	DBG_FAULT(19)
1098	FAULT(19)
1099
1100//
1101// --- End of long entries, Beginning of short entries
1102//
1103
1104	.org ia64_ivt+0x5000
1105/////////////////////////////////////////////////////////////////////////////////////////
1106// 0x5000 Entry 20 (size 16 bundles) Page Not Present (10,22,49)
1107ENTRY(page_not_present)
1108	DBG_FAULT(20)
1109	MOV_FROM_IFA(r16)
1110	RSM_PSR_DT
1111	/*
1112	 * The Linux page fault handler doesn't expect non-present pages to be in
1113	 * the TLB.  Flush the existing entry now, so we meet that expectation.
1114	 */
1115	mov r17=PAGE_SHIFT<<2
1116	;;
1117	ptc.l r16,r17
1118	;;
1119	mov r31=pr
1120	srlz.d
1121	br.sptk.many page_fault
1122END(page_not_present)
1123
1124	.org ia64_ivt+0x5100
1125/////////////////////////////////////////////////////////////////////////////////////////
1126// 0x5100 Entry 21 (size 16 bundles) Key Permission (13,25,52)
1127ENTRY(key_permission)
1128	DBG_FAULT(21)
1129	MOV_FROM_IFA(r16)
1130	RSM_PSR_DT
1131	mov r31=pr
1132	;;
1133	srlz.d
1134	br.sptk.many page_fault
1135END(key_permission)
1136
1137	.org ia64_ivt+0x5200
1138/////////////////////////////////////////////////////////////////////////////////////////
1139// 0x5200 Entry 22 (size 16 bundles) Instruction Access Rights (26)
1140ENTRY(iaccess_rights)
1141	DBG_FAULT(22)
1142	MOV_FROM_IFA(r16)
1143	RSM_PSR_DT
1144	mov r31=pr
1145	;;
1146	srlz.d
1147	br.sptk.many page_fault
1148END(iaccess_rights)
1149
1150	.org ia64_ivt+0x5300
1151/////////////////////////////////////////////////////////////////////////////////////////
1152// 0x5300 Entry 23 (size 16 bundles) Data Access Rights (14,53)
1153ENTRY(daccess_rights)
1154	DBG_FAULT(23)
1155	MOV_FROM_IFA(r16)
1156	RSM_PSR_DT
1157	mov r31=pr
1158	;;
1159	srlz.d
1160	br.sptk.many page_fault
1161END(daccess_rights)
1162
1163	.org ia64_ivt+0x5400
1164/////////////////////////////////////////////////////////////////////////////////////////
1165// 0x5400 Entry 24 (size 16 bundles) General Exception (5,32,34,36,38,39)
1166ENTRY(general_exception)
1167	DBG_FAULT(24)
1168	MOV_FROM_ISR(r16)
1169	mov r31=pr
1170	;;
1171	cmp4.eq p6,p0=0,r16
1172(p6)	br.sptk.many dispatch_illegal_op_fault
1173	;;
1174	mov r19=24		// fault number
1175	br.sptk.many dispatch_to_fault_handler
1176END(general_exception)
1177
1178	.org ia64_ivt+0x5500
1179/////////////////////////////////////////////////////////////////////////////////////////
1180// 0x5500 Entry 25 (size 16 bundles) Disabled FP-Register (35)
1181ENTRY(disabled_fp_reg)
1182	DBG_FAULT(25)
1183	rsm psr.dfh		// ensure we can access fph
1184	;;
1185	srlz.d
1186	mov r31=pr
1187	mov r19=25
1188	br.sptk.many dispatch_to_fault_handler
1189END(disabled_fp_reg)
1190
1191	.org ia64_ivt+0x5600
1192/////////////////////////////////////////////////////////////////////////////////////////
1193// 0x5600 Entry 26 (size 16 bundles) Nat Consumption (11,23,37,50)
1194ENTRY(nat_consumption)
1195	DBG_FAULT(26)
1196
1197	MOV_FROM_IPSR(p0, r16)
1198	MOV_FROM_ISR(r17)
1199	mov r31=pr				// save PR
1200	;;
1201	and r18=0xf,r17				// r18 = cr.ipsr.code{3:0}
1202	tbit.z p6,p0=r17,IA64_ISR_NA_BIT
1203	;;
1204	cmp.ne.or p6,p0=IA64_ISR_CODE_LFETCH,r18
1205	dep r16=-1,r16,IA64_PSR_ED_BIT,1
1206(p6)	br.cond.spnt 1f		// branch if (cr.ispr.na == 0 || cr.ipsr.code{3:0} != LFETCH)
1207	;;
1208	MOV_TO_IPSR(p0, r16, r18)
1209	mov pr=r31,-1
1210	;;
1211	RFI
1212
12131:	mov pr=r31,-1
1214	;;
1215	FAULT(26)
1216END(nat_consumption)
1217
1218	.org ia64_ivt+0x5700
1219/////////////////////////////////////////////////////////////////////////////////////////
1220// 0x5700 Entry 27 (size 16 bundles) Speculation (40)
1221ENTRY(speculation_vector)
1222	DBG_FAULT(27)
1223	/*
1224	 * A [f]chk.[as] instruction needs to take the branch to the recovery code but
1225	 * this part of the architecture is not implemented in hardware on some CPUs, such
1226	 * as Itanium.  Thus, in general we need to emulate the behavior.  IIM contains
1227	 * the relative target (not yet sign extended).  So after sign extending it we
1228	 * simply add it to IIP.  We also need to reset the EI field of the IPSR to zero,
1229	 * i.e., the slot to restart into.
1230	 *
1231	 * cr.imm contains zero_ext(imm21)
1232	 */
1233	MOV_FROM_IIM(r18)
1234	;;
1235	MOV_FROM_IIP(r17)
1236	shl r18=r18,43			// put sign bit in position (43=64-21)
1237	;;
1238
1239	MOV_FROM_IPSR(p0, r16)
1240	shr r18=r18,39			// sign extend (39=43-4)
1241	;;
1242
1243	add r17=r17,r18			// now add the offset
1244	;;
1245	MOV_TO_IIP(r17, r19)
1246	dep r16=0,r16,41,2		// clear EI
1247	;;
1248
1249	MOV_TO_IPSR(p0, r16, r19)
1250	;;
1251
1252	RFI
1253END(speculation_vector)
1254
1255	.org ia64_ivt+0x5800
1256/////////////////////////////////////////////////////////////////////////////////////////
1257// 0x5800 Entry 28 (size 16 bundles) Reserved
1258	DBG_FAULT(28)
1259	FAULT(28)
1260
1261	.org ia64_ivt+0x5900
1262/////////////////////////////////////////////////////////////////////////////////////////
1263// 0x5900 Entry 29 (size 16 bundles) Debug (16,28,56)
1264ENTRY(debug_vector)
1265	DBG_FAULT(29)
1266	FAULT(29)
1267END(debug_vector)
1268
1269	.org ia64_ivt+0x5a00
1270/////////////////////////////////////////////////////////////////////////////////////////
1271// 0x5a00 Entry 30 (size 16 bundles) Unaligned Reference (57)
1272ENTRY(unaligned_access)
1273	DBG_FAULT(30)
1274	mov r31=pr		// prepare to save predicates
1275	;;
1276	br.sptk.many dispatch_unaligned_handler
1277END(unaligned_access)
1278
1279	.org ia64_ivt+0x5b00
1280/////////////////////////////////////////////////////////////////////////////////////////
1281// 0x5b00 Entry 31 (size 16 bundles) Unsupported Data Reference (57)
1282ENTRY(unsupported_data_reference)
1283	DBG_FAULT(31)
1284	FAULT(31)
1285END(unsupported_data_reference)
1286
1287	.org ia64_ivt+0x5c00
1288/////////////////////////////////////////////////////////////////////////////////////////
1289// 0x5c00 Entry 32 (size 16 bundles) Floating-Point Fault (64)
1290ENTRY(floating_point_fault)
1291	DBG_FAULT(32)
1292	FAULT(32)
1293END(floating_point_fault)
1294
1295	.org ia64_ivt+0x5d00
1296/////////////////////////////////////////////////////////////////////////////////////////
1297// 0x5d00 Entry 33 (size 16 bundles) Floating Point Trap (66)
1298ENTRY(floating_point_trap)
1299	DBG_FAULT(33)
1300	FAULT(33)
1301END(floating_point_trap)
1302
1303	.org ia64_ivt+0x5e00
1304/////////////////////////////////////////////////////////////////////////////////////////
1305// 0x5e00 Entry 34 (size 16 bundles) Lower Privilege Transfer Trap (66)
1306ENTRY(lower_privilege_trap)
1307	DBG_FAULT(34)
1308	FAULT(34)
1309END(lower_privilege_trap)
1310
1311	.org ia64_ivt+0x5f00
1312/////////////////////////////////////////////////////////////////////////////////////////
1313// 0x5f00 Entry 35 (size 16 bundles) Taken Branch Trap (68)
1314ENTRY(taken_branch_trap)
1315	DBG_FAULT(35)
1316	FAULT(35)
1317END(taken_branch_trap)
1318
1319	.org ia64_ivt+0x6000
1320/////////////////////////////////////////////////////////////////////////////////////////
1321// 0x6000 Entry 36 (size 16 bundles) Single Step Trap (69)
1322ENTRY(single_step_trap)
1323	DBG_FAULT(36)
1324	FAULT(36)
1325END(single_step_trap)
1326
1327	.org ia64_ivt+0x6100
1328/////////////////////////////////////////////////////////////////////////////////////////
1329// 0x6100 Entry 37 (size 16 bundles) Reserved
1330	DBG_FAULT(37)
1331	FAULT(37)
1332
1333	.org ia64_ivt+0x6200
1334/////////////////////////////////////////////////////////////////////////////////////////
1335// 0x6200 Entry 38 (size 16 bundles) Reserved
1336	DBG_FAULT(38)
1337	FAULT(38)
1338
1339	.org ia64_ivt+0x6300
1340/////////////////////////////////////////////////////////////////////////////////////////
1341// 0x6300 Entry 39 (size 16 bundles) Reserved
1342	DBG_FAULT(39)
1343	FAULT(39)
1344
1345	.org ia64_ivt+0x6400
1346/////////////////////////////////////////////////////////////////////////////////////////
1347// 0x6400 Entry 40 (size 16 bundles) Reserved
1348	DBG_FAULT(40)
1349	FAULT(40)
1350
1351	.org ia64_ivt+0x6500
1352/////////////////////////////////////////////////////////////////////////////////////////
1353// 0x6500 Entry 41 (size 16 bundles) Reserved
1354	DBG_FAULT(41)
1355	FAULT(41)
1356
1357	.org ia64_ivt+0x6600
1358/////////////////////////////////////////////////////////////////////////////////////////
1359// 0x6600 Entry 42 (size 16 bundles) Reserved
1360	DBG_FAULT(42)
1361	FAULT(42)
1362
1363	.org ia64_ivt+0x6700
1364/////////////////////////////////////////////////////////////////////////////////////////
1365// 0x6700 Entry 43 (size 16 bundles) Reserved
1366	DBG_FAULT(43)
1367	FAULT(43)
1368
1369	.org ia64_ivt+0x6800
1370/////////////////////////////////////////////////////////////////////////////////////////
1371// 0x6800 Entry 44 (size 16 bundles) Reserved
1372	DBG_FAULT(44)
1373	FAULT(44)
1374
1375	.org ia64_ivt+0x6900
1376/////////////////////////////////////////////////////////////////////////////////////////
1377// 0x6900 Entry 45 (size 16 bundles) IA-32 Exeception (17,18,29,41,42,43,44,58,60,61,62,72,73,75,76,77)
1378ENTRY(ia32_exception)
1379	DBG_FAULT(45)
1380	FAULT(45)
1381END(ia32_exception)
1382
1383	.org ia64_ivt+0x6a00
1384/////////////////////////////////////////////////////////////////////////////////////////
1385// 0x6a00 Entry 46 (size 16 bundles) IA-32 Intercept  (30,31,59,70,71)
1386ENTRY(ia32_intercept)
1387	DBG_FAULT(46)
1388	FAULT(46)
1389END(ia32_intercept)
1390
1391	.org ia64_ivt+0x6b00
1392/////////////////////////////////////////////////////////////////////////////////////////
1393// 0x6b00 Entry 47 (size 16 bundles) IA-32 Interrupt  (74)
1394ENTRY(ia32_interrupt)
1395	DBG_FAULT(47)
1396	FAULT(47)
1397END(ia32_interrupt)
1398
1399	.org ia64_ivt+0x6c00
1400/////////////////////////////////////////////////////////////////////////////////////////
1401// 0x6c00 Entry 48 (size 16 bundles) Reserved
1402	DBG_FAULT(48)
1403	FAULT(48)
1404
1405	.org ia64_ivt+0x6d00
1406/////////////////////////////////////////////////////////////////////////////////////////
1407// 0x6d00 Entry 49 (size 16 bundles) Reserved
1408	DBG_FAULT(49)
1409	FAULT(49)
1410
1411	.org ia64_ivt+0x6e00
1412/////////////////////////////////////////////////////////////////////////////////////////
1413// 0x6e00 Entry 50 (size 16 bundles) Reserved
1414	DBG_FAULT(50)
1415	FAULT(50)
1416
1417	.org ia64_ivt+0x6f00
1418/////////////////////////////////////////////////////////////////////////////////////////
1419// 0x6f00 Entry 51 (size 16 bundles) Reserved
1420	DBG_FAULT(51)
1421	FAULT(51)
1422
1423	.org ia64_ivt+0x7000
1424/////////////////////////////////////////////////////////////////////////////////////////
1425// 0x7000 Entry 52 (size 16 bundles) Reserved
1426	DBG_FAULT(52)
1427	FAULT(52)
1428
1429	.org ia64_ivt+0x7100
1430/////////////////////////////////////////////////////////////////////////////////////////
1431// 0x7100 Entry 53 (size 16 bundles) Reserved
1432	DBG_FAULT(53)
1433	FAULT(53)
1434
1435	.org ia64_ivt+0x7200
1436/////////////////////////////////////////////////////////////////////////////////////////
1437// 0x7200 Entry 54 (size 16 bundles) Reserved
1438	DBG_FAULT(54)
1439	FAULT(54)
1440
1441	.org ia64_ivt+0x7300
1442/////////////////////////////////////////////////////////////////////////////////////////
1443// 0x7300 Entry 55 (size 16 bundles) Reserved
1444	DBG_FAULT(55)
1445	FAULT(55)
1446
1447	.org ia64_ivt+0x7400
1448/////////////////////////////////////////////////////////////////////////////////////////
1449// 0x7400 Entry 56 (size 16 bundles) Reserved
1450	DBG_FAULT(56)
1451	FAULT(56)
1452
1453	.org ia64_ivt+0x7500
1454/////////////////////////////////////////////////////////////////////////////////////////
1455// 0x7500 Entry 57 (size 16 bundles) Reserved
1456	DBG_FAULT(57)
1457	FAULT(57)
1458
1459	.org ia64_ivt+0x7600
1460/////////////////////////////////////////////////////////////////////////////////////////
1461// 0x7600 Entry 58 (size 16 bundles) Reserved
1462	DBG_FAULT(58)
1463	FAULT(58)
1464
1465	.org ia64_ivt+0x7700
1466/////////////////////////////////////////////////////////////////////////////////////////
1467// 0x7700 Entry 59 (size 16 bundles) Reserved
1468	DBG_FAULT(59)
1469	FAULT(59)
1470
1471	.org ia64_ivt+0x7800
1472/////////////////////////////////////////////////////////////////////////////////////////
1473// 0x7800 Entry 60 (size 16 bundles) Reserved
1474	DBG_FAULT(60)
1475	FAULT(60)
1476
1477	.org ia64_ivt+0x7900
1478/////////////////////////////////////////////////////////////////////////////////////////
1479// 0x7900 Entry 61 (size 16 bundles) Reserved
1480	DBG_FAULT(61)
1481	FAULT(61)
1482
1483	.org ia64_ivt+0x7a00
1484/////////////////////////////////////////////////////////////////////////////////////////
1485// 0x7a00 Entry 62 (size 16 bundles) Reserved
1486	DBG_FAULT(62)
1487	FAULT(62)
1488
1489	.org ia64_ivt+0x7b00
1490/////////////////////////////////////////////////////////////////////////////////////////
1491// 0x7b00 Entry 63 (size 16 bundles) Reserved
1492	DBG_FAULT(63)
1493	FAULT(63)
1494
1495	.org ia64_ivt+0x7c00
1496/////////////////////////////////////////////////////////////////////////////////////////
1497// 0x7c00 Entry 64 (size 16 bundles) Reserved
1498	DBG_FAULT(64)
1499	FAULT(64)
1500
1501	.org ia64_ivt+0x7d00
1502/////////////////////////////////////////////////////////////////////////////////////////
1503// 0x7d00 Entry 65 (size 16 bundles) Reserved
1504	DBG_FAULT(65)
1505	FAULT(65)
1506
1507	.org ia64_ivt+0x7e00
1508/////////////////////////////////////////////////////////////////////////////////////////
1509// 0x7e00 Entry 66 (size 16 bundles) Reserved
1510	DBG_FAULT(66)
1511	FAULT(66)
1512
1513	.org ia64_ivt+0x7f00
1514/////////////////////////////////////////////////////////////////////////////////////////
1515// 0x7f00 Entry 67 (size 16 bundles) Reserved
1516	DBG_FAULT(67)
1517	FAULT(67)
1518
1519	//-----------------------------------------------------------------------------------
1520	// call do_page_fault (predicates are in r31, psr.dt may be off, r16 is faulting address)
1521ENTRY(page_fault)
1522	SSM_PSR_DT_AND_SRLZ_I
1523	;;
1524	SAVE_MIN_WITH_COVER
1525	alloc r15=ar.pfs,0,0,3,0
1526	MOV_FROM_IFA(out0)
1527	MOV_FROM_ISR(out1)
1528	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r14, r3)
1529	adds r3=8,r2				// set up second base pointer
1530	SSM_PSR_I(p15, p15, r14)		// restore psr.i
1531	movl r14=ia64_leave_kernel
1532	;;
1533	SAVE_REST
1534	mov rp=r14
1535	;;
1536	adds out2=16,r12			// out2 = pointer to pt_regs
1537	br.call.sptk.many b6=ia64_do_page_fault	// ignore return address
1538END(page_fault)
1539
1540ENTRY(non_syscall)
1541	mov ar.rsc=r27			// restore ar.rsc before SAVE_MIN_WITH_COVER
1542	;;
1543	SAVE_MIN_WITH_COVER
1544
1545	// There is no particular reason for this code to be here, other than that
1546	// there happens to be space here that would go unused otherwise.  If this
1547	// fault ever gets "unreserved", simply moved the following code to a more
1548	// suitable spot...
1549
1550	alloc r14=ar.pfs,0,0,2,0
1551	MOV_FROM_IIM(out0)
1552	add out1=16,sp
1553	adds r3=8,r2			// set up second base pointer for SAVE_REST
1554
1555	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r15, r24)
1556					// guarantee that interruption collection is on
1557	SSM_PSR_I(p15, p15, r15)	// restore psr.i
1558	movl r15=ia64_leave_kernel
1559	;;
1560	SAVE_REST
1561	mov rp=r15
1562	;;
1563	br.call.sptk.many b6=ia64_bad_break	// avoid WAW on CFM and ignore return addr
1564END(non_syscall)
1565
1566ENTRY(__interrupt)
1567	DBG_FAULT(12)
1568	mov r31=pr		// prepare to save predicates
1569	;;
1570	SAVE_MIN_WITH_COVER	// uses r31; defines r2 and r3
1571	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r14)
1572				// ensure everybody knows psr.ic is back on
1573	adds r3=8,r2		// set up second base pointer for SAVE_REST
1574	;;
1575	SAVE_REST
1576	;;
1577	MCA_RECOVER_RANGE(interrupt)
1578	alloc r14=ar.pfs,0,0,2,0 // must be first in an insn group
1579	MOV_FROM_IVR(out0, r8)	// pass cr.ivr as first arg
1580	add out1=16,sp		// pass pointer to pt_regs as second arg
1581	;;
1582	srlz.d			// make sure we see the effect of cr.ivr
1583	movl r14=ia64_leave_kernel
1584	;;
1585	mov rp=r14
1586	br.call.sptk.many b6=ia64_handle_irq
1587END(__interrupt)
1588
1589	/*
1590	 * There is no particular reason for this code to be here, other than that
1591	 * there happens to be space here that would go unused otherwise.  If this
1592	 * fault ever gets "unreserved", simply moved the following code to a more
1593	 * suitable spot...
1594	 */
1595
1596ENTRY(dispatch_unaligned_handler)
1597	SAVE_MIN_WITH_COVER
1598	;;
1599	alloc r14=ar.pfs,0,0,2,0		// now it's safe (must be first in insn group!)
1600	MOV_FROM_IFA(out0)
1601	adds out1=16,sp
1602
1603	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r24)
1604						// guarantee that interruption collection is on
1605	SSM_PSR_I(p15, p15, r3)			// restore psr.i
1606	adds r3=8,r2				// set up second base pointer
1607	;;
1608	SAVE_REST
1609	movl r14=ia64_leave_kernel
1610	;;
1611	mov rp=r14
1612	br.sptk.many ia64_prepare_handle_unaligned
1613END(dispatch_unaligned_handler)
1614
1615	/*
1616	 * There is no particular reason for this code to be here, other than that
1617	 * there happens to be space here that would go unused otherwise.  If this
1618	 * fault ever gets "unreserved", simply moved the following code to a more
1619	 * suitable spot...
1620	 */
1621
1622ENTRY(dispatch_to_fault_handler)
1623	/*
1624	 * Input:
1625	 *	psr.ic:	off
1626	 *	r19:	fault vector number (e.g., 24 for General Exception)
1627	 *	r31:	contains saved predicates (pr)
1628	 */
1629	SAVE_MIN_WITH_COVER_R19
1630	alloc r14=ar.pfs,0,0,5,0
1631	MOV_FROM_ISR(out1)
1632	MOV_FROM_IFA(out2)
1633	MOV_FROM_IIM(out3)
1634	MOV_FROM_ITIR(out4)
1635	;;
1636	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, out0)
1637						// guarantee that interruption collection is on
1638	mov out0=r15
1639	;;
1640	SSM_PSR_I(p15, p15, r3)			// restore psr.i
1641	adds r3=8,r2				// set up second base pointer for SAVE_REST
1642	;;
1643	SAVE_REST
1644	movl r14=ia64_leave_kernel
1645	;;
1646	mov rp=r14
1647	br.call.sptk.many b6=ia64_fault
1648END(dispatch_to_fault_handler)
1649
1650	/*
1651	 * Squatting in this space ...
1652	 *
1653	 * This special case dispatcher for illegal operation faults allows preserved
1654	 * registers to be modified through a callback function (asm only) that is handed
1655	 * back from the fault handler in r8. Up to three arguments can be passed to the
1656	 * callback function by returning an aggregate with the callback as its first
1657	 * element, followed by the arguments.
1658	 */
1659ENTRY(dispatch_illegal_op_fault)
1660	.prologue
1661	.body
1662	SAVE_MIN_WITH_COVER
1663	SSM_PSR_IC_AND_DEFAULT_BITS_AND_SRLZ_I(r3, r24)
1664				// guarantee that interruption collection is on
1665	;;
1666	SSM_PSR_I(p15, p15, r3)	// restore psr.i
1667	adds r3=8,r2	// set up second base pointer for SAVE_REST
1668	;;
1669	alloc r14=ar.pfs,0,0,1,0	// must be first in insn group
1670	mov out0=ar.ec
1671	;;
1672	SAVE_REST
1673	PT_REGS_UNWIND_INFO(0)
1674	;;
1675	br.call.sptk.many rp=ia64_illegal_op_fault
1676.ret0:	;;
1677	alloc r14=ar.pfs,0,0,3,0	// must be first in insn group
1678	mov out0=r9
1679	mov out1=r10
1680	mov out2=r11
1681	movl r15=ia64_leave_kernel
1682	;;
1683	mov rp=r15
1684	mov b6=r8
1685	;;
1686	cmp.ne p6,p0=0,r8
1687(p6)	br.call.dpnt.many b6=b6		// call returns to ia64_leave_kernel
1688	br.sptk.many ia64_leave_kernel
1689END(dispatch_illegal_op_fault)
1690