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 <linux/pgtable.h>
  52#include <asm/asmmacro.h>
  53#include <asm/break.h>
  54#include <asm/kregs.h>
  55#include <asm/asm-offsets.h>
 
  56#include <asm/processor.h>
  57#include <asm/ptrace.h>
  58#include <asm/thread_info.h>
  59#include <asm/unistd.h>
  60#include <asm/errno.h>
  61#include <asm/export.h>
  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)