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 = ¤t_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
