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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/ia64/kernel/ivt.S
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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1/*
2 * arch/ia64/kernel/ivt.S
3 *
4 * Copyright (C) 1998-2001, 2003 Hewlett-Packard Co
5 * Stephane Eranian <eranian@hpl.hp.com>
6 * David Mosberger <davidm@hpl.hp.com>
7 * Copyright (C) 2000, 2002-2003 Intel Co
8 * Asit Mallick <asit.k.mallick@intel.com>
9 * Suresh Siddha <suresh.b.siddha@intel.com>
10 * Kenneth Chen <kenneth.w.chen@intel.com>
11 * Fenghua Yu <fenghua.yu@intel.com>
12 *
13 * 00/08/23 Asit Mallick <asit.k.mallick@intel.com> TLB handling for SMP
14 * 00/12/20 David Mosberger-Tang <davidm@hpl.hp.com> DTLB/ITLB handler now uses virtual PT.
15 */
16/*
17 * This file defines the interruption vector table used by the CPU.
18 * It does not include one entry per possible cause of interruption.
19 *
20 * The first 20 entries of the table contain 64 bundles each while the
21 * remaining 48 entries contain only 16 bundles each.
22 *
23 * The 64 bundles are used to allow inlining the whole handler for critical
24 * interruptions like TLB misses.
25 *
26 * For each entry, the comment is as follows:
27 *
28 * // 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
29 * entry offset ----/ / / / /
30 * entry number ---------/ / / /
31 * size of the entry -------------/ / /
32 * vector name -------------------------------------/ /
33 * interruptions triggering this vector ----------------------/
34 *
35 * The table is 32KB in size and must be aligned on 32KB boundary.
36 * (The CPU ignores the 15 lower bits of the address)
37 *
38 * Table is based upon EAS2.6 (Oct 1999)
39 */
40
41#include <linux/config.h>
42
43#include <asm/asmmacro.h>
44#include <asm/break.h>
45#include <asm/ia32.h>
46#include <asm/kregs.h>
47#include <asm/offsets.h>
48#include <asm/pgtable.h>
49#include <asm/processor.h>
50#include <asm/ptrace.h>
51#include <asm/system.h>
52#include <asm/thread_info.h>
53#include <asm/unistd.h>
54#include <asm/errno.h>
55
56#if 1
57# define PSR_DEFAULT_BITS psr.ac
58#else
59# define PSR_DEFAULT_BITS 0
60#endif
61
62#if 0
63 /*
64 * This lets you track the last eight faults that occurred on the CPU. Make sure ar.k2 isn't
65 * needed for something else before enabling this...
66 */
67# define DBG_FAULT(i) mov r16=ar.k2;; shl r16=r16,8;; add r16=(i),r16;;mov ar.k2=r16
68#else
69# define DBG_FAULT(i)
70#endif
71
72#define MINSTATE_VIRT /* needed by minstate.h */
73#include "minstate.h"
74
75#define FAULT(n) \
76 mov r31=pr; \
77 mov r19=n;; /* prepare to save predicates */ \
78 br.sptk.many dispatch_to_fault_handler
79
80 .section .text.ivt,"ax"
81
82 .align 32768 // align on 32KB boundary
83 .global ia64_ivt
84ia64_ivt:
85/////////////////////////////////////////////////////////////////////////////////////////
86// 0x0000 Entry 0 (size 64 bundles) VHPT Translation (8,20,47)
87ENTRY(vhpt_miss)
88 DBG_FAULT(0)
89 /*
90 * The VHPT vector is invoked when the TLB entry for the virtual page table
91 * is missing. This happens only as a result of a previous
92 * (the "original") TLB miss, which may either be caused by an instruction
93 * fetch or a data access (or non-access).
94 *
95 * What we do here is normal TLB miss handing for the _original_ miss, followed
96 * by inserting the TLB entry for the virtual page table page that the VHPT
97 * walker was attempting to access. The latter gets inserted as long
98 * as both L1 and L2 have valid mappings for the faulting address.
99 * The TLB entry for the original miss gets inserted only if
100 * the L3 entry indicates that the page is present.
101 *
102 * do_page_fault gets invoked in the following cases:
103 * - the faulting virtual address uses unimplemented address bits
104 * - the faulting virtual address has no L1, L2, or L3 mapping
105 */
106 mov r16=cr.ifa // get address that caused the TLB miss
107#ifdef CONFIG_HUGETLB_PAGE
108 movl r18=PAGE_SHIFT
109 mov r25=cr.itir
110#endif
111 ;;
112 rsm psr.dt // use physical addressing for data
113 mov r31=pr // save the predicate registers
114 mov r19=IA64_KR(PT_BASE) // get page table base address
115 shl r21=r16,3 // shift bit 60 into sign bit
116 shr.u r17=r16,61 // get the region number into r17
117 ;;
118 shr r22=r21,3
119#ifdef CONFIG_HUGETLB_PAGE
120 extr.u r26=r25,2,6
121 ;;
122 cmp.ne p8,p0=r18,r26
123 sub r27=r26,r18
124 ;;
125(p8) dep r25=r18,r25,2,6
126(p8) shr r22=r22,r27
127#endif
128 ;;
129 cmp.eq p6,p7=5,r17 // is IFA pointing into to region 5?
130 shr.u r18=r22,PGDIR_SHIFT // get bits 33-63 of the faulting address
131 ;;
132(p7) dep r17=r17,r19,(PAGE_SHIFT-3),3 // put region number bits in place
133
134 srlz.d
135 LOAD_PHYSICAL(p6, r19, swapper_pg_dir) // region 5 is rooted at swapper_pg_dir
136
137 .pred.rel "mutex", p6, p7
138(p6) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
139(p7) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
140 ;;
141(p6) dep r17=r18,r19,3,(PAGE_SHIFT-3) // r17=PTA + IFA(33,42)*8
142(p7) dep r17=r18,r17,3,(PAGE_SHIFT-6) // r17=PTA + (((IFA(61,63) << 7) | IFA(33,39))*8)
143 cmp.eq p7,p6=0,r21 // unused address bits all zeroes?
144 shr.u r18=r22,PMD_SHIFT // shift L2 index into position
145 ;;
146 ld8 r17=[r17] // fetch the L1 entry (may be 0)
147 ;;
148(p7) cmp.eq p6,p7=r17,r0 // was L1 entry NULL?
149 dep r17=r18,r17,3,(PAGE_SHIFT-3) // compute address of L2 page table entry
150 ;;
151(p7) ld8 r20=[r17] // fetch the L2 entry (may be 0)
152 shr.u r19=r22,PAGE_SHIFT // shift L3 index into position
153 ;;
154(p7) cmp.eq.or.andcm p6,p7=r20,r0 // was L2 entry NULL?
155 dep r21=r19,r20,3,(PAGE_SHIFT-3) // compute address of L3 page table entry
156 ;;
157(p7) ld8 r18=[r21] // read the L3 PTE
158 mov r19=cr.isr // cr.isr bit 0 tells us if this is an insn miss
159 ;;
160(p7) tbit.z p6,p7=r18,_PAGE_P_BIT // page present bit cleared?
161 mov r22=cr.iha // get the VHPT address that caused the TLB miss
162 ;; // avoid RAW on p7
163(p7) tbit.nz.unc p10,p11=r19,32 // is it an instruction TLB miss?
164 dep r23=0,r20,0,PAGE_SHIFT // clear low bits to get page address
165 ;;
166(p10) itc.i r18 // insert the instruction TLB entry
167(p11) itc.d r18 // insert the data TLB entry
168(p6) br.cond.spnt.many page_fault // handle bad address/page not present (page fault)
169 mov cr.ifa=r22
170
171#ifdef CONFIG_HUGETLB_PAGE
172(p8) mov cr.itir=r25 // change to default page-size for VHPT
173#endif
174
175 /*
176 * Now compute and insert the TLB entry for the virtual page table. We never
177 * execute in a page table page so there is no need to set the exception deferral
178 * bit.
179 */
180 adds r24=__DIRTY_BITS_NO_ED|_PAGE_PL_0|_PAGE_AR_RW,r23
181 ;;
182(p7) itc.d r24
183 ;;
184#ifdef CONFIG_SMP
185 /*
186 * Tell the assemblers dependency-violation checker that the above "itc" instructions
187 * cannot possibly affect the following loads:
188 */
189 dv_serialize_data
190
191 /*
192 * Re-check L2 and L3 pagetable. If they changed, we may have received a ptc.g
193 * between reading the pagetable and the "itc". If so, flush the entry we
194 * inserted and retry.
195 */
196 ld8 r25=[r21] // read L3 PTE again
197 ld8 r26=[r17] // read L2 entry again
198 ;;
199 cmp.ne p6,p7=r26,r20 // did L2 entry change
200 mov r27=PAGE_SHIFT<<2
201 ;;
202(p6) ptc.l r22,r27 // purge PTE page translation
203(p7) cmp.ne.or.andcm p6,p7=r25,r18 // did L3 PTE change
204 ;;
205(p6) ptc.l r16,r27 // purge translation
206#endif
207
208 mov pr=r31,-1 // restore predicate registers
209 rfi
210END(vhpt_miss)
211
212 .org ia64_ivt+0x400
213/////////////////////////////////////////////////////////////////////////////////////////
214// 0x0400 Entry 1 (size 64 bundles) ITLB (21)
215ENTRY(itlb_miss)
216 DBG_FAULT(1)
217 /*
218 * The ITLB handler accesses the L3 PTE via the virtually mapped linear
219 * page table. If a nested TLB miss occurs, we switch into physical
220 * mode, walk the page table, and then re-execute the L3 PTE read
221 * and go on normally after that.
222 */
223 mov r16=cr.ifa // get virtual address
224 mov r29=b0 // save b0
225 mov r31=pr // save predicates
226.itlb_fault:
227 mov r17=cr.iha // get virtual address of L3 PTE
228 movl r30=1f // load nested fault continuation point
229 ;;
2301: ld8 r18=[r17] // read L3 PTE
231 ;;
232 mov b0=r29
233 tbit.z p6,p0=r18,_PAGE_P_BIT // page present bit cleared?
234(p6) br.cond.spnt page_fault
235 ;;
236 itc.i r18
237 ;;
238#ifdef CONFIG_SMP
239 /*
240 * Tell the assemblers dependency-violation checker that the above "itc" instructions
241 * cannot possibly affect the following loads:
242 */
243 dv_serialize_data
244
245 ld8 r19=[r17] // read L3 PTE again and see if same
246 mov r20=PAGE_SHIFT<<2 // setup page size for purge
247 ;;
248 cmp.ne p7,p0=r18,r19
249 ;;
250(p7) ptc.l r16,r20
251#endif
252 mov pr=r31,-1
253 rfi
254END(itlb_miss)
255
256 .org ia64_ivt+0x0800
257/////////////////////////////////////////////////////////////////////////////////////////
258// 0x0800 Entry 2 (size 64 bundles) DTLB (9,48)
259ENTRY(dtlb_miss)
260 DBG_FAULT(2)
261 /*
262 * The DTLB handler accesses the L3 PTE via the virtually mapped linear
263 * page table. If a nested TLB miss occurs, we switch into physical
264 * mode, walk the page table, and then re-execute the L3 PTE read
265 * and go on normally after that.
266 */
267 mov r16=cr.ifa // get virtual address
268 mov r29=b0 // save b0
269 mov r31=pr // save predicates
270dtlb_fault:
271 mov r17=cr.iha // get virtual address of L3 PTE
272 movl r30=1f // load nested fault continuation point
273 ;;
2741: ld8 r18=[r17] // read L3 PTE
275 ;;
276 mov b0=r29
277 tbit.z p6,p0=r18,_PAGE_P_BIT // page present bit cleared?
278(p6) br.cond.spnt page_fault
279 ;;
280 itc.d r18
281 ;;
282#ifdef CONFIG_SMP
283 /*
284 * Tell the assemblers dependency-violation checker that the above "itc" instructions
285 * cannot possibly affect the following loads:
286 */
287 dv_serialize_data
288
289 ld8 r19=[r17] // read L3 PTE again and see if same
290 mov r20=PAGE_SHIFT<<2 // setup page size for purge
291 ;;
292 cmp.ne p7,p0=r18,r19
293 ;;
294(p7) ptc.l r16,r20
295#endif
296 mov pr=r31,-1
297 rfi
298END(dtlb_miss)
299
300 .org ia64_ivt+0x0c00
301/////////////////////////////////////////////////////////////////////////////////////////
302// 0x0c00 Entry 3 (size 64 bundles) Alt ITLB (19)
303ENTRY(alt_itlb_miss)
304 DBG_FAULT(3)
305 mov r16=cr.ifa // get address that caused the TLB miss
306 movl r17=PAGE_KERNEL
307 mov r21=cr.ipsr
308 movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
309 mov r31=pr
310 ;;
311#ifdef CONFIG_DISABLE_VHPT
312 shr.u r22=r16,61 // get the region number into r21
313 ;;
314 cmp.gt p8,p0=6,r22 // user mode
315 ;;
316(p8) thash r17=r16
317 ;;
318(p8) mov cr.iha=r17
319(p8) mov r29=b0 // save b0
320(p8) br.cond.dptk .itlb_fault
321#endif
322 extr.u r23=r21,IA64_PSR_CPL0_BIT,2 // extract psr.cpl
323 and r19=r19,r16 // clear ed, reserved bits, and PTE control bits
324 shr.u r18=r16,57 // move address bit 61 to bit 4
325 ;;
326 andcm r18=0x10,r18 // bit 4=~address-bit(61)
327 cmp.ne p8,p0=r0,r23 // psr.cpl != 0?
328 or r19=r17,r19 // insert PTE control bits into r19
329 ;;
330 or r19=r19,r18 // set bit 4 (uncached) if the access was to region 6
331(p8) br.cond.spnt page_fault
332 ;;
333 itc.i r19 // insert the TLB entry
334 mov pr=r31,-1
335 rfi
336END(alt_itlb_miss)
337
338 .org ia64_ivt+0x1000
339/////////////////////////////////////////////////////////////////////////////////////////
340// 0x1000 Entry 4 (size 64 bundles) Alt DTLB (7,46)
341ENTRY(alt_dtlb_miss)
342 DBG_FAULT(4)
343 mov r16=cr.ifa // get address that caused the TLB miss
344 movl r17=PAGE_KERNEL
345 mov r20=cr.isr
346 movl r19=(((1 << IA64_MAX_PHYS_BITS) - 1) & ~0xfff)
347 mov r21=cr.ipsr
348 mov r31=pr
349 ;;
350#ifdef CONFIG_DISABLE_VHPT
351 shr.u r22=r16,61 // get the region number into r21
352 ;;
353 cmp.gt p8,p0=6,r22 // access to region 0-5
354 ;;
355(p8) thash r17=r16
356 ;;
357(p8) mov cr.iha=r17
358(p8) mov r29=b0 // save b0
359(p8) br.cond.dptk dtlb_fault
360#endif
361 extr.u r23=r21,IA64_PSR_CPL0_BIT,2 // extract psr.cpl
362 and r22=IA64_ISR_CODE_MASK,r20 // get the isr.code field
363 tbit.nz p6,p7=r20,IA64_ISR_SP_BIT // is speculation bit on?
364 shr.u r18=r16,57 // move address bit 61 to bit 4
365 and r19=r19,r16 // clear ed, reserved bits, and PTE control bits
366 tbit.nz p9,p0=r20,IA64_ISR_NA_BIT // is non-access bit on?
367 ;;
368 andcm r18=0x10,r18 // bit 4=~address-bit(61)
369 cmp.ne p8,p0=r0,r23
370(p9) cmp.eq.or.andcm p6,p7=IA64_ISR_CODE_LFETCH,r22 // check isr.code field
371(p8) br.cond.spnt page_fault
372
373 dep r21=-1,r21,IA64_PSR_ED_BIT,1
374 or r19=r19,r17 // insert PTE control bits into r19
375 ;;
376 or r19=r19,r18 // set bit 4 (uncached) if the access was to region 6
377(p6) mov cr.ipsr=r21
378 ;;
379(p7) itc.d r19 // insert the TLB entry
380 mov pr=r31,-1
381 rfi
382END(alt_dtlb_miss)
383
384 .org ia64_ivt+0x1400
385/////////////////////////////////////////////////////////////////////////////////////////
386// 0x1400 Entry 5 (size 64 bundles) Data nested TLB (6,45)
387ENTRY(nested_dtlb_miss)
388 /*
389 * In the absence of kernel bugs, we get here when the virtually mapped linear
390 * page table is accessed non-speculatively (e.g., in the Dirty-bit, Instruction
391 * Access-bit, or Data Access-bit faults). If the DTLB entry for the virtual page
392 * table is missing, a nested TLB miss fault is triggered and control is
393 * transferred to this point. When this happens, we lookup the pte for the
394 * faulting address by walking the page table in physical mode and return to the
395 * continuation point passed in register r30 (or call page_fault if the address is
396 * not mapped).
397 *
398 * Input: r16: faulting address
399 * r29: saved b0
400 * r30: continuation address
401 * r31: saved pr
402 *
403 * Output: r17: physical address of L3 PTE of faulting address
404 * r29: saved b0
405 * r30: continuation address
406 * r31: saved pr
407 *
408 * Clobbered: b0, r18, r19, r21, psr.dt (cleared)
409 */
410 rsm psr.dt // switch to using physical data addressing
411 mov r19=IA64_KR(PT_BASE) // get the page table base address
412 shl r21=r16,3 // shift bit 60 into sign bit
413 ;;
414 shr.u r17=r16,61 // get the region number into r17
415 ;;
416 cmp.eq p6,p7=5,r17 // is faulting address in region 5?
417 shr.u r18=r16,PGDIR_SHIFT // get bits 33-63 of faulting address
418 ;;
419(p7) dep r17=r17,r19,(PAGE_SHIFT-3),3 // put region number bits in place
420
421 srlz.d
422 LOAD_PHYSICAL(p6, r19, swapper_pg_dir) // region 5 is rooted at swapper_pg_dir
423
424 .pred.rel "mutex", p6, p7
425(p6) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT
426(p7) shr.u r21=r21,PGDIR_SHIFT+PAGE_SHIFT-3
427 ;;
428(p6) dep r17=r18,r19,3,(PAGE_SHIFT-3) // r17=PTA + IFA(33,42)*8
429(p7) dep r17=r18,r17,3,(PAGE_SHIFT-6) // r17=PTA + (((IFA(61,63) << 7) | IFA(33,39))*8)
430 cmp.eq p7,p6=0,r21 // unused address bits all zeroes?
431 shr.u r18=r16,PMD_SHIFT // shift L2 index into position
432 ;;
433 ld8 r17=[r17] // fetch the L1 entry (may be 0)
434 ;;
435(p7) cmp.eq p6,p7=r17,r0 // was L1 entry NULL?
436 dep r17=r18,r17,3,(PAGE_SHIFT-3) // compute address of L2 page table entry
437 ;;
438(p7) ld8 r17=[r17] // fetch the L2 entry (may be 0)
439 shr.u r19=r16,PAGE_SHIFT // shift L3 index into position
440 ;;
441(p7) cmp.eq.or.andcm p6,p7=r17,r0 // was L2 entry NULL?
442 dep r17=r19,r17,3,(PAGE_SHIFT-3) // compute address of L3 page table entry
443(p6) br.cond.spnt page_fault
444 mov b0=r30
445 br.sptk.many b0 // return to continuation point
446END(nested_dtlb_miss)
447
448 .org ia64_ivt+0x1800
449/////////////////////////////////////////////////////////////////////////////////////////
450// 0x1800 Entry 6 (size 64 bundles) Instruction Key Miss (24)
451ENTRY(ikey_miss)
452 DBG_FAULT(6)
453 FAULT(6)
454END(ikey_miss)
455
456 //-----------------------------------------------------------------------------------
457 // call do_page_fault (predicates are in r31, psr.dt may be off, r16 is faulting address)
458ENTRY(page_fault)
459 ssm psr.dt
460 ;;
461 srlz.i
462 ;;
463 SAVE_MIN_WITH_COVER
464 alloc r15=ar.pfs,0,0,3,0
465 mov out0=cr.ifa
466 mov out1=cr.isr
467 adds r3=8,r2 // set up second base pointer
468 ;;
469 ssm psr.ic | PSR_DEFAULT_BITS
470 ;;
471 srlz.i // guarantee that interruption collectin is on
472 ;;
473(p15) ssm psr.i // restore psr.i
474 movl r14=ia64_leave_kernel
475 ;;
476 SAVE_REST
477 mov rp=r14
478 ;;
479 adds out2=16,r12 // out2 = pointer to pt_regs
480 br.call.sptk.many b6=ia64_do_page_fault // ignore return address
481END(page_fault)
482
483 .org ia64_ivt+0x1c00
484/////////////////////////////////////////////////////////////////////////////////////////
485// 0x1c00 Entry 7 (size 64 bundles) Data Key Miss (12,51)
486ENTRY(dkey_miss)
487 DBG_FAULT(7)
488 FAULT(7)
489END(dkey_miss)
490
491 .org ia64_ivt+0x2000
492/////////////////////////////////////////////////////////////////////////////////////////
493// 0x2000 Entry 8 (size 64 bundles) Dirty-bit (54)
494ENTRY(dirty_bit)
495 DBG_FAULT(8)
496 /*
497 * What we do here is to simply turn on the dirty bit in the PTE. We need to
498 * update both the page-table and the TLB entry. To efficiently access the PTE,
499 * we address it through the virtual page table. Most likely, the TLB entry for
500 * the relevant virtual page table page is still present in the TLB so we can
501 * normally do this without additional TLB misses. In case the necessary virtual
502 * page table TLB entry isn't present, we take a nested TLB miss hit where we look
503 * up the physical address of the L3 PTE and then continue at label 1 below.
504 */
505 mov r16=cr.ifa // get the address that caused the fault
506 movl r30=1f // load continuation point in case of nested fault
507 ;;
508 thash r17=r16 // compute virtual address of L3 PTE
509 mov r29=b0 // save b0 in case of nested fault
510 mov r31=pr // save pr
511#ifdef CONFIG_SMP
512 mov r28=ar.ccv // save ar.ccv
513 ;;
5141: ld8 r18=[r17]
515 ;; // avoid RAW on r18
516 mov ar.ccv=r18 // set compare value for cmpxchg
517 or r25=_PAGE_D|_PAGE_A,r18 // set the dirty and accessed bits
518 ;;
519 cmpxchg8.acq r26=[r17],r25,ar.ccv
520 mov r24=PAGE_SHIFT<<2
521 ;;
522 cmp.eq p6,p7=r26,r18
523 ;;
524(p6) itc.d r25 // install updated PTE
525 ;;
526 /*
527 * Tell the assemblers dependency-violation checker that the above "itc" instructions
528 * cannot possibly affect the following loads:
529 */
530 dv_serialize_data
531
532 ld8 r18=[r17] // read PTE again
533 ;;
534 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
535 ;;
536(p7) ptc.l r16,r24
537 mov b0=r29 // restore b0
538 mov ar.ccv=r28
539#else
540 ;;
5411: ld8 r18=[r17]
542 ;; // avoid RAW on r18
543 or r18=_PAGE_D|_PAGE_A,r18 // set the dirty and accessed bits
544 mov b0=r29 // restore b0
545 ;;
546 st8 [r17]=r18 // store back updated PTE
547 itc.d r18 // install updated PTE
548#endif
549 mov pr=r31,-1 // restore pr
550 rfi
551END(dirty_bit)
552
553 .org ia64_ivt+0x2400
554/////////////////////////////////////////////////////////////////////////////////////////
555// 0x2400 Entry 9 (size 64 bundles) Instruction Access-bit (27)
556ENTRY(iaccess_bit)
557 DBG_FAULT(9)
558 // Like Entry 8, except for instruction access
559 mov r16=cr.ifa // get the address that caused the fault
560 movl r30=1f // load continuation point in case of nested fault
561 mov r31=pr // save predicates
562#ifdef CONFIG_ITANIUM
563 /*
564 * Erratum 10 (IFA may contain incorrect address) has "NoFix" status.
565 */
566 mov r17=cr.ipsr
567 ;;
568 mov r18=cr.iip
569 tbit.z p6,p0=r17,IA64_PSR_IS_BIT // IA64 instruction set?
570 ;;
571(p6) mov r16=r18 // if so, use cr.iip instead of cr.ifa
572#endif /* CONFIG_ITANIUM */
573 ;;
574 thash r17=r16 // compute virtual address of L3 PTE
575 mov r29=b0 // save b0 in case of nested fault)
576#ifdef CONFIG_SMP
577 mov r28=ar.ccv // save ar.ccv
578 ;;
5791: ld8 r18=[r17]
580 ;;
581 mov ar.ccv=r18 // set compare value for cmpxchg
582 or r25=_PAGE_A,r18 // set the accessed bit
583 ;;
584 cmpxchg8.acq r26=[r17],r25,ar.ccv
585 mov r24=PAGE_SHIFT<<2
586 ;;
587 cmp.eq p6,p7=r26,r18
588 ;;
589(p6) itc.i r25 // install updated PTE
590 ;;
591 /*
592 * Tell the assemblers dependency-violation checker that the above "itc" instructions
593 * cannot possibly affect the following loads:
594 */
595 dv_serialize_data
596
597 ld8 r18=[r17] // read PTE again
598 ;;
599 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
600 ;;
601(p7) ptc.l r16,r24
602 mov b0=r29 // restore b0
603 mov ar.ccv=r28
604#else /* !CONFIG_SMP */
605 ;;
6061: ld8 r18=[r17]
607 ;;
608 or r18=_PAGE_A,r18 // set the accessed bit
609 mov b0=r29 // restore b0
610 ;;
611 st8 [r17]=r18 // store back updated PTE
612 itc.i r18 // install updated PTE
613#endif /* !CONFIG_SMP */
614 mov pr=r31,-1
615 rfi
616END(iaccess_bit)
617
618 .org ia64_ivt+0x2800
619/////////////////////////////////////////////////////////////////////////////////////////
620// 0x2800 Entry 10 (size 64 bundles) Data Access-bit (15,55)
621ENTRY(daccess_bit)
622 DBG_FAULT(10)
623 // Like Entry 8, except for data access
624 mov r16=cr.ifa // get the address that caused the fault
625 movl r30=1f // load continuation point in case of nested fault
626 ;;
627 thash r17=r16 // compute virtual address of L3 PTE
628 mov r31=pr
629 mov r29=b0 // save b0 in case of nested fault)
630#ifdef CONFIG_SMP
631 mov r28=ar.ccv // save ar.ccv
632 ;;
6331: ld8 r18=[r17]
634 ;; // avoid RAW on r18
635 mov ar.ccv=r18 // set compare value for cmpxchg
636 or r25=_PAGE_A,r18 // set the dirty bit
637 ;;
638 cmpxchg8.acq r26=[r17],r25,ar.ccv
639 mov r24=PAGE_SHIFT<<2
640 ;;
641 cmp.eq p6,p7=r26,r18
642 ;;
643(p6) itc.d r25 // install updated PTE
644 /*
645 * Tell the assemblers dependency-violation checker that the above "itc" instructions
646 * cannot possibly affect the following loads:
647 */
648 dv_serialize_data
649 ;;
650 ld8 r18=[r17] // read PTE again
651 ;;
652 cmp.eq p6,p7=r18,r25 // is it same as the newly installed
653 ;;
654(p7) ptc.l r16,r24
655 mov ar.ccv=r28
656#else
657 ;;
6581: ld8 r18=[r17]
659 ;; // avoid RAW on r18
660 or r18=_PAGE_A,r18 // set the accessed bit
661 ;;
662 st8 [r17]=r18 // store back updated PTE
663 itc.d r18 // install updated PTE
664#endif
665 mov b0=r29 // restore b0
666 mov pr=r31,-1
667 rfi
668END(daccess_bit)
669
670 .org ia64_ivt+0x2c00
671/////////////////////////////////////////////////////////////////////////////////////////
672// 0x2c00 Entry 11 (size 64 bundles) Break instruction (33)
673ENTRY(break_fault)
674 /*
675 * The streamlined system call entry/exit paths only save/restore the initial part
676 * of pt_regs. This implies that the callers of system-calls must adhere to the
677 * normal procedure calling conventions.
678 *
679 * Registers to be saved & restored:
680 * CR registers: cr.ipsr, cr.iip, cr.ifs
681 * AR registers: ar.unat, ar.pfs, ar.rsc, ar.rnat, ar.bspstore, ar.fpsr
682 * others: pr, b0, b6, loadrs, r1, r11, r12, r13, r15
683 * Registers to be restored only:
684 * r8-r11: output value from the system call.
685 *
686 * During system call exit, scratch registers (including r15) are modified/cleared
687 * to prevent leaking bits from kernel to user level.
688 */
689 DBG_FAULT(11)
690 mov r16=IA64_KR(CURRENT) // r16 = current task; 12 cycle read lat.
691 mov r17=cr.iim
692 mov r18=__IA64_BREAK_SYSCALL
693 mov r21=ar.fpsr
694 mov r29=cr.ipsr
695 mov r19=b6
696 mov r25=ar.unat
697 mov r27=ar.rsc
698 mov r26=ar.pfs
699 mov r28=cr.iip
700 mov r31=pr // prepare to save predicates
701 mov r20=r1
702 ;;
703 adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16
704 cmp.eq p0,p7=r18,r17 // is this a system call? (p7 <- false, if so)
705(p7) br.cond.spnt non_syscall
706 ;;
707 ld1 r17=[r16] // load current->thread.on_ustack flag
708 st1 [r16]=r0 // clear current->thread.on_ustack flag
709 add r1=-IA64_TASK_THREAD_ON_USTACK_OFFSET,r16 // set r1 for MINSTATE_START_SAVE_MIN_VIRT
710 ;;
711 invala
712
713 /* adjust return address so we skip over the break instruction: */
714
715 extr.u r8=r29,41,2 // extract ei field from cr.ipsr
716 ;;
717 cmp.eq p6,p7=2,r8 // isr.ei==2?
718 mov r2=r1 // setup r2 for ia64_syscall_setup
719 ;;
720(p6) mov r8=0 // clear ei to 0
721(p6) adds r28=16,r28 // switch cr.iip to next bundle cr.ipsr.ei wrapped
722(p7) adds r8=1,r8 // increment ei to next slot
723 ;;
724 cmp.eq pKStk,pUStk=r0,r17 // are we in kernel mode already?
725 dep r29=r8,r29,41,2 // insert new ei into cr.ipsr
726 ;;
727
728 // switch from user to kernel RBS:
729 MINSTATE_START_SAVE_MIN_VIRT
730 br.call.sptk.many b7=ia64_syscall_setup
731 ;;
732 MINSTATE_END_SAVE_MIN_VIRT // switch to bank 1
733 ssm psr.ic | PSR_DEFAULT_BITS
734 ;;
735 srlz.i // guarantee that interruption collection is on
736 mov r3=NR_syscalls - 1
737 ;;
738(p15) ssm psr.i // restore psr.i
739 // p10==true means out registers are more than 8 or r15's Nat is true
740(p10) br.cond.spnt.many ia64_ret_from_syscall
741 ;;
742 movl r16=sys_call_table
743
744 adds r15=-1024,r15 // r15 contains the syscall number---subtract 1024
745 movl r2=ia64_ret_from_syscall
746 ;;
747 shladd r20=r15,3,r16 // r20 = sys_call_table + 8*(syscall-1024)
748 cmp.leu p6,p7=r15,r3 // (syscall > 0 && syscall < 1024 + NR_syscalls) ?
749 mov rp=r2 // set the real return addr
750 ;;
751(p6) ld8 r20=[r20] // load address of syscall entry point
752(p7) movl r20=sys_ni_syscall
753
754 add r2=TI_FLAGS+IA64_TASK_SIZE,r13
755 ;;
756 ld4 r2=[r2] // r2 = current_thread_info()->flags
757 ;;
758 and r2=_TIF_SYSCALL_TRACEAUDIT,r2 // mask trace or audit
759 ;;
760 cmp.eq p8,p0=r2,r0
761 mov b6=r20
762 ;;
763(p8) br.call.sptk.many b6=b6 // ignore this return addr
764 br.cond.sptk ia64_trace_syscall
765 // NOT REACHED
766END(break_fault)
767
768 .org ia64_ivt+0x3000
769/////////////////////////////////////////////////////////////////////////////////////////
770// 0x3000 Entry 12 (size 64 bundles) External Interrupt (4)
771ENTRY(interrupt)
772 DBG_FAULT(12)
773 mov r31=pr // prepare to save predicates
774 ;;
775 SAVE_MIN_WITH_COVER // uses r31; defines r2 and r3
776 ssm psr.ic | PSR_DEFAULT_BITS
777 ;;
778 adds r3=8,r2 // set up second base pointer for SAVE_REST
779 srlz.i // ensure everybody knows psr.ic is back on
780 ;;
781 SAVE_REST
782 ;;
783 alloc r14=ar.pfs,0,0,2,0 // must be first in an insn group
784 mov out0=cr.ivr // pass cr.ivr as first arg
785 add out1=16,sp // pass pointer to pt_regs as second arg
786 ;;
787 srlz.d // make sure we see the effect of cr.ivr
788 movl r14=ia64_leave_kernel
789 ;;
790 mov rp=r14
791 br.call.sptk.many b6=ia64_handle_irq
792END(interrupt)
793
794 .org ia64_ivt+0x3400
795/////////////////////////////////////////////////////////////////////////////////////////
796// 0x3400 Entry 13 (size 64 bundles) Reserved
797 DBG_FAULT(13)
798 FAULT(13)
799
800 .org ia64_ivt+0x3800
801/////////////////////////////////////////////////////////////////////////////////////////
802// 0x3800 Entry 14 (size 64 bundles) Reserved
803 DBG_FAULT(14)
804 FAULT(14)
805
806 /*
807 * There is no particular reason for this code to be here, other than that
808 * there happens to be space here that would go unused otherwise. If this
809 * fault ever gets "unreserved", simply moved the following code to a more
810 * suitable spot...
811 *
812 * ia64_syscall_setup() is a separate subroutine so that it can
813 * allocate stacked registers so it can safely demine any
814 * potential NaT values from the input registers.
815 *
816 * On entry:
817 * - executing on bank 0 or bank 1 register set (doesn't matter)
818 * - r1: stack pointer
819 * - r2: current task pointer
820 * - r3: preserved
821 * - r11: original contents (saved ar.pfs to be saved)
822 * - r12: original contents (sp to be saved)
823 * - r13: original contents (tp to be saved)
824 * - r15: original contents (syscall # to be saved)
825 * - r18: saved bsp (after switching to kernel stack)
826 * - r19: saved b6
827 * - r20: saved r1 (gp)
828 * - r21: saved ar.fpsr
829 * - r22: kernel's register backing store base (krbs_base)
830 * - r23: saved ar.bspstore
831 * - r24: saved ar.rnat
832 * - r25: saved ar.unat
833 * - r26: saved ar.pfs
834 * - r27: saved ar.rsc
835 * - r28: saved cr.iip
836 * - r29: saved cr.ipsr
837 * - r31: saved pr
838 * - b0: original contents (to be saved)
839 * On exit:
840 * - executing on bank 1 registers
841 * - psr.ic enabled, interrupts restored
842 * - p10: TRUE if syscall is invoked with more than 8 out
843 * registers or r15's Nat is true
844 * - r1: kernel's gp
845 * - r3: preserved (same as on entry)
846 * - r8: -EINVAL if p10 is true
847 * - r12: points to kernel stack
848 * - r13: points to current task
849 * - p15: TRUE if interrupts need to be re-enabled
850 * - ar.fpsr: set to kernel settings
851 */
852GLOBAL_ENTRY(ia64_syscall_setup)
853#if PT(B6) != 0
854# error This code assumes that b6 is the first field in pt_regs.
855#endif
856 st8 [r1]=r19 // save b6
857 add r16=PT(CR_IPSR),r1 // initialize first base pointer
858 add r17=PT(R11),r1 // initialize second base pointer
859 ;;
860 alloc r19=ar.pfs,8,0,0,0 // ensure in0-in7 are writable
861 st8 [r16]=r29,PT(AR_PFS)-PT(CR_IPSR) // save cr.ipsr
862 tnat.nz p8,p0=in0
863
864 st8.spill [r17]=r11,PT(CR_IIP)-PT(R11) // save r11
865 tnat.nz p9,p0=in1
866(pKStk) mov r18=r0 // make sure r18 isn't NaT
867 ;;
868
869 st8 [r16]=r26,PT(CR_IFS)-PT(AR_PFS) // save ar.pfs
870 st8 [r17]=r28,PT(AR_UNAT)-PT(CR_IIP) // save cr.iip
871 mov r28=b0 // save b0 (2 cyc)
872 ;;
873
874 st8 [r17]=r25,PT(AR_RSC)-PT(AR_UNAT) // save ar.unat
875 dep r19=0,r19,38,26 // clear all bits but 0..37 [I0]
876(p8) mov in0=-1
877 ;;
878
879 st8 [r16]=r19,PT(AR_RNAT)-PT(CR_IFS) // store ar.pfs.pfm in cr.ifs
880 extr.u r11=r19,7,7 // I0 // get sol of ar.pfs
881 and r8=0x7f,r19 // A // get sof of ar.pfs
882
883 st8 [r17]=r27,PT(AR_BSPSTORE)-PT(AR_RSC)// save ar.rsc
884 tbit.nz p15,p0=r29,IA64_PSR_I_BIT // I0
885(p9) mov in1=-1
886 ;;
887
888(pUStk) sub r18=r18,r22 // r18=RSE.ndirty*8
889 tnat.nz p10,p0=in2
890 add r11=8,r11
891 ;;
892(pKStk) adds r16=PT(PR)-PT(AR_RNAT),r16 // skip over ar_rnat field
893(pKStk) adds r17=PT(B0)-PT(AR_BSPSTORE),r17 // skip over ar_bspstore field
894 tnat.nz p11,p0=in3
895 ;;
896(p10) mov in2=-1
897 tnat.nz p12,p0=in4 // [I0]
898(p11) mov in3=-1
899 ;;
900(pUStk) st8 [r16]=r24,PT(PR)-PT(AR_RNAT) // save ar.rnat
901(pUStk) st8 [r17]=r23,PT(B0)-PT(AR_BSPSTORE) // save ar.bspstore
902 shl r18=r18,16 // compute ar.rsc to be used for "loadrs"
903 ;;
904 st8 [r16]=r31,PT(LOADRS)-PT(PR) // save predicates
905 st8 [r17]=r28,PT(R1)-PT(B0) // save b0
906 tnat.nz p13,p0=in5 // [I0]
907 ;;
908 st8 [r16]=r18,PT(R12)-PT(LOADRS) // save ar.rsc value for "loadrs"
909 st8.spill [r17]=r20,PT(R13)-PT(R1) // save original r1
910(p12) mov in4=-1
911 ;;
912
913.mem.offset 0,0; st8.spill [r16]=r12,PT(AR_FPSR)-PT(R12) // save r12
914.mem.offset 8,0; st8.spill [r17]=r13,PT(R15)-PT(R13) // save r13
915(p13) mov in5=-1
916 ;;
917 st8 [r16]=r21,PT(R8)-PT(AR_FPSR) // save ar.fpsr
918 tnat.nz p14,p0=in6
919 cmp.lt p10,p9=r11,r8 // frame size can't be more than local+8
920 ;;
921 stf8 [r16]=f1 // ensure pt_regs.r8 != 0 (see handle_syscall_error)
922(p9) tnat.nz p10,p0=r15
923 adds r12=-16,r1 // switch to kernel memory stack (with 16 bytes of scratch)
924
925 st8.spill [r17]=r15 // save r15
926 tnat.nz p8,p0=in7
927 nop.i 0
928
929 mov r13=r2 // establish `current'
930 movl r1=__gp // establish kernel global pointer
931 ;;
932(p14) mov in6=-1
933(p8) mov in7=-1
934 nop.i 0
935
936 cmp.eq pSys,pNonSys=r0,r0 // set pSys=1, pNonSys=0
937 movl r17=FPSR_DEFAULT
938 ;;
939 mov.m ar.fpsr=r17 // set ar.fpsr to kernel default value
940(p10) mov r8=-EINVAL
941 br.ret.sptk.many b7
942END(ia64_syscall_setup)
943
944 .org ia64_ivt+0x3c00
945/////////////////////////////////////////////////////////////////////////////////////////
946// 0x3c00 Entry 15 (size 64 bundles) Reserved
947 DBG_FAULT(15)
948 FAULT(15)
949
950 /*
951 * Squatting in this space ...
952 *
953 * This special case dispatcher for illegal operation faults allows preserved
954 * registers to be modified through a callback function (asm only) that is handed
955 * back from the fault handler in r8. Up to three arguments can be passed to the
956 * callback function by returning an aggregate with the callback as its first
957 * element, followed by the arguments.
958 */
959ENTRY(dispatch_illegal_op_fault)
960 .prologue
961 .body
962 SAVE_MIN_WITH_COVER
963 ssm psr.ic | PSR_DEFAULT_BITS
964 ;;
965 srlz.i // guarantee that interruption collection is on
966 ;;
967(p15) ssm psr.i // restore psr.i
968 adds r3=8,r2 // set up second base pointer for SAVE_REST
969 ;;
970 alloc r14=ar.pfs,0,0,1,0 // must be first in insn group
971 mov out0=ar.ec
972 ;;
973 SAVE_REST
974 PT_REGS_UNWIND_INFO(0)
975 ;;
976 br.call.sptk.many rp=ia64_illegal_op_fault
977.ret0: ;;
978 alloc r14=ar.pfs,0,0,3,0 // must be first in insn group
979 mov out0=r9
980 mov out1=r10
981 mov out2=r11
982 movl r15=ia64_leave_kernel
983 ;;
984 mov rp=r15
985 mov b6=r8
986 ;;
987 cmp.ne p6,p0=0,r8
988(p6) br.call.dpnt.many b6=b6 // call returns to ia64_leave_kernel
989 br.sptk.many ia64_leave_kernel
990END(dispatch_illegal_op_fault)
991
992 .org ia64_ivt+0x4000
993/////////////////////////////////////////////////////////////////////////////////////////
994// 0x4000 Entry 16 (size 64 bundles) Reserved
995 DBG_FAULT(16)
996 FAULT(16)
997
998 .org ia64_ivt+0x4400
999/////////////////////////////////////////////////////////////////////////////////////////
1000// 0x4400 Entry 17 (size 64 bundles) Reserved
1001 DBG_FAULT(17)
1002 FAULT(17)
1003
1004ENTRY(non_syscall)
1005 SAVE_MIN_WITH_COVER
1006
1007 // There is no particular reason for this code to be here, other than that
1008 // there happens to be space here that would go unused otherwise. If this
1009 // fault ever gets "unreserved", simply moved the following code to a more
1010 // suitable spot...
1011
1012 alloc r14=ar.pfs,0,0,2,0
1013 mov out0=cr.iim
1014 add out1=16,sp
1015 adds r3=8,r2 // set up second base pointer for SAVE_REST
1016
1017 ssm psr.ic | PSR_DEFAULT_BITS
1018 ;;
1019 srlz.i // guarantee that interruption collection is on
1020 ;;
1021(p15) ssm psr.i // restore psr.i
1022 movl r15=ia64_leave_kernel
1023 ;;
1024 SAVE_REST
1025 mov rp=r15
1026 ;;
1027 br.call.sptk.many b6=ia64_bad_break // avoid WAW on CFM and ignore return addr
1028END(non_syscall)
1029
1030 .org ia64_ivt+0x4800
1031/////////////////////////////////////////////////////////////////////////////////////////
1032// 0x4800 Entry 18 (size 64 bundles) Reserved
1033 DBG_FAULT(18)
1034 FAULT(18)
1035
1036 /*
1037 * There is no particular reason for this code to be here, other than that
1038 * there happens to be space here that would go unused otherwise. If this
1039 * fault ever gets "unreserved", simply moved the following code to a more
1040 * suitable spot...
1041 */
1042
1043ENTRY(dispatch_unaligned_handler)
1044 SAVE_MIN_WITH_COVER
1045 ;;
1046 alloc r14=ar.pfs,0,0,2,0 // now it's safe (must be first in insn group!)
1047 mov out0=cr.ifa
1048 adds out1=16,sp
1049
1050 ssm psr.ic | PSR_DEFAULT_BITS
1051 ;;
1052 srlz.i // guarantee that interruption collection is on
1053 ;;
1054(p15) ssm psr.i // restore psr.i
1055 adds r3=8,r2 // set up second base pointer
1056 ;;
1057 SAVE_REST
1058 movl r14=ia64_leave_kernel
1059 ;;
1060 mov rp=r14
1061 br.sptk.many ia64_prepare_handle_unaligned
1062END(dispatch_unaligned_handler)
1063
1064 .org ia64_ivt+0x4c00
1065/////////////////////////////////////////////////////////////////////////////////////////
1066// 0x4c00 Entry 19 (size 64 bundles) Reserved
1067 DBG_FAULT(19)
1068 FAULT(19)
1069
1070 /*
1071 * There is no particular reason for this code to be here, other than that
1072 * there happens to be space here that would go unused otherwise. If this
1073 * fault ever gets "unreserved", simply moved the following code to a more
1074 * suitable spot...
1075 */
1076
1077ENTRY(dispatch_to_fault_handler)
1078 /*
1079 * Input:
1080 * psr.ic: off
1081 * r19: fault vector number (e.g., 24 for General Exception)
1082 * r31: contains saved predicates (pr)
1083 */
1084 SAVE_MIN_WITH_COVER_R19
1085 alloc r14=ar.pfs,0,0,5,0
1086 mov out0=r15
1087 mov out1=cr.isr
1088 mov out2=cr.ifa
1089 mov out3=cr.iim
1090 mov out4=cr.itir
1091 ;;
1092 ssm psr.ic | PSR_DEFAULT_BITS
1093 ;;
1094 srlz.i // guarantee that interruption collection is on
1095 ;;
1096(p15) ssm psr.i // restore psr.i
1097 adds r3=8,r2 // set up second base pointer for SAVE_REST
1098 ;;
1099 SAVE_REST
1100 movl r14=ia64_leave_kernel
1101 ;;
1102 mov rp=r14
1103 br.call.sptk.many b6=ia64_fault
1104END(dispatch_to_fault_handler)
1105
1106//
1107// --- End of long entries, Beginning of short entries
1108//
1109
1110 .org ia64_ivt+0x5000
1111/////////////////////////////////////////////////////////////////////////////////////////
1112// 0x5000 Entry 20 (size 16 bundles) Page Not Present (10,22,49)
1113ENTRY(page_not_present)
1114 DBG_FAULT(20)
1115 mov r16=cr.ifa
1116 rsm psr.dt
1117 /*
1118 * The Linux page fault handler doesn't expect non-present pages to be in
1119 * the TLB. Flush the existing entry now, so we meet that expectation.
1120 */
1121 mov r17=PAGE_SHIFT<<2
1122 ;;
1123 ptc.l r16,r17
1124 ;;
1125 mov r31=pr
1126 srlz.d
1127 br.sptk.many page_fault
1128END(page_not_present)
1129
1130 .org ia64_ivt+0x5100
1131/////////////////////////////////////////////////////////////////////////////////////////
1132// 0x5100 Entry 21 (size 16 bundles) Key Permission (13,25,52)
1133ENTRY(key_permission)
1134 DBG_FAULT(21)
1135 mov r16=cr.ifa
1136 rsm psr.dt
1137 mov r31=pr
1138 ;;
1139 srlz.d
1140 br.sptk.many page_fault
1141END(key_permission)
1142
1143 .org ia64_ivt+0x5200
1144/////////////////////////////////////////////////////////////////////////////////////////
1145// 0x5200 Entry 22 (size 16 bundles) Instruction Access Rights (26)
1146ENTRY(iaccess_rights)
1147 DBG_FAULT(22)
1148 mov r16=cr.ifa
1149 rsm psr.dt
1150 mov r31=pr
1151 ;;
1152 srlz.d
1153 br.sptk.many page_fault
1154END(iaccess_rights)
1155
1156 .org ia64_ivt+0x5300
1157/////////////////////////////////////////////////////////////////////////////////////////
1158// 0x5300 Entry 23 (size 16 bundles) Data Access Rights (14,53)
1159ENTRY(daccess_rights)
1160 DBG_FAULT(23)
1161 mov r16=cr.ifa
1162 rsm psr.dt
1163 mov r31=pr
1164 ;;
1165 srlz.d
1166 br.sptk.many page_fault
1167END(daccess_rights)
1168
1169 .org ia64_ivt+0x5400
1170/////////////////////////////////////////////////////////////////////////////////////////
1171// 0x5400 Entry 24 (size 16 bundles) General Exception (5,32,34,36,38,39)
1172ENTRY(general_exception)
1173 DBG_FAULT(24)
1174 mov r16=cr.isr
1175 mov r31=pr
1176 ;;
1177 cmp4.eq p6,p0=0,r16
1178(p6) br.sptk.many dispatch_illegal_op_fault
1179 ;;
1180 mov r19=24 // fault number
1181 br.sptk.many dispatch_to_fault_handler
1182END(general_exception)
1183
1184 .org ia64_ivt+0x5500
1185/////////////////////////////////////////////////////////////////////////////////////////
1186// 0x5500 Entry 25 (size 16 bundles) Disabled FP-Register (35)
1187ENTRY(disabled_fp_reg)
1188 DBG_FAULT(25)
1189 rsm psr.dfh // ensure we can access fph
1190 ;;
1191 srlz.d
1192 mov r31=pr
1193 mov r19=25
1194 br.sptk.many dispatch_to_fault_handler
1195END(disabled_fp_reg)
1196
1197 .org ia64_ivt+0x5600
1198/////////////////////////////////////////////////////////////////////////////////////////
1199// 0x5600 Entry 26 (size 16 bundles) Nat Consumption (11,23,37,50)
1200ENTRY(nat_consumption)
1201 DBG_FAULT(26)
1202 FAULT(26)
1203END(nat_consumption)
1204
1205 .org ia64_ivt+0x5700
1206/////////////////////////////////////////////////////////////////////////////////////////
1207// 0x5700 Entry 27 (size 16 bundles) Speculation (40)
1208ENTRY(speculation_vector)
1209 DBG_FAULT(27)
1210 /*
1211 * A [f]chk.[as] instruction needs to take the branch to the recovery code but
1212 * this part of the architecture is not implemented in hardware on some CPUs, such
1213 * as Itanium. Thus, in general we need to emulate the behavior. IIM contains
1214 * the relative target (not yet sign extended). So after sign extending it we
1215 * simply add it to IIP. We also need to reset the EI field of the IPSR to zero,
1216 * i.e., the slot to restart into.
1217 *
1218 * cr.imm contains zero_ext(imm21)
1219 */
1220 mov r18=cr.iim
1221 ;;
1222 mov r17=cr.iip
1223 shl r18=r18,43 // put sign bit in position (43=64-21)
1224 ;;
1225
1226 mov r16=cr.ipsr
1227 shr r18=r18,39 // sign extend (39=43-4)
1228 ;;
1229
1230 add r17=r17,r18 // now add the offset
1231 ;;
1232 mov cr.iip=r17
1233 dep r16=0,r16,41,2 // clear EI
1234 ;;
1235
1236 mov cr.ipsr=r16
1237 ;;
1238
1239 rfi // and go back
1240END(speculation_vector)
1241
1242 .org ia64_ivt+0x5800
1243/////////////////////////////////////////////////////////////////////////////////////////
1244// 0x5800 Entry 28 (size 16 bundles) Reserved
1245 DBG_FAULT(28)
1246 FAULT(28)
1247
1248 .org ia64_ivt+0x5900
1249/////////////////////////////////////////////////////////////////////////////////////////
1250// 0x5900 Entry 29 (size 16 bundles) Debug (16,28,56)
1251ENTRY(debug_vector)
1252 DBG_FAULT(29)
1253 FAULT(29)
1254END(debug_vector)
1255
1256 .org ia64_ivt+0x5a00
1257/////////////////////////////////////////////////////////////////////////////////////////
1258// 0x5a00 Entry 30 (size 16 bundles) Unaligned Reference (57)
1259ENTRY(unaligned_access)
1260 DBG_FAULT(30)
1261 mov r16=cr.ipsr
1262 mov r31=pr // prepare to save predicates
1263 ;;
1264 br.sptk.many dispatch_unaligned_handler
1265END(unaligned_access)
1266
1267 .org ia64_ivt+0x5b00
1268/////////////////////////////////////////////////////////////////////////////////////////
1269// 0x5b00 Entry 31 (size 16 bundles) Unsupported Data Reference (57)
1270ENTRY(unsupported_data_reference)
1271 DBG_FAULT(31)
1272 FAULT(31)
1273END(unsupported_data_reference)
1274
1275 .org ia64_ivt+0x5c00
1276/////////////////////////////////////////////////////////////////////////////////////////
1277// 0x5c00 Entry 32 (size 16 bundles) Floating-Point Fault (64)
1278ENTRY(floating_point_fault)
1279 DBG_FAULT(32)
1280 FAULT(32)
1281END(floating_point_fault)
1282
1283 .org ia64_ivt+0x5d00
1284/////////////////////////////////////////////////////////////////////////////////////////
1285// 0x5d00 Entry 33 (size 16 bundles) Floating Point Trap (66)
1286ENTRY(floating_point_trap)
1287 DBG_FAULT(33)
1288 FAULT(33)
1289END(floating_point_trap)
1290
1291 .org ia64_ivt+0x5e00
1292/////////////////////////////////////////////////////////////////////////////////////////
1293// 0x5e00 Entry 34 (size 16 bundles) Lower Privilege Transfer Trap (66)
1294ENTRY(lower_privilege_trap)
1295 DBG_FAULT(34)
1296 FAULT(34)
1297END(lower_privilege_trap)
1298
1299 .org ia64_ivt+0x5f00
1300/////////////////////////////////////////////////////////////////////////////////////////
1301// 0x5f00 Entry 35 (size 16 bundles) Taken Branch Trap (68)
1302ENTRY(taken_branch_trap)
1303 DBG_FAULT(35)
1304 FAULT(35)
1305END(taken_branch_trap)
1306
1307 .org ia64_ivt+0x6000
1308/////////////////////////////////////////////////////////////////////////////////////////
1309// 0x6000 Entry 36 (size 16 bundles) Single Step Trap (69)
1310ENTRY(single_step_trap)
1311 DBG_FAULT(36)
1312 FAULT(36)
1313END(single_step_trap)
1314
1315 .org ia64_ivt+0x6100
1316/////////////////////////////////////////////////////////////////////////////////////////
1317// 0x6100 Entry 37 (size 16 bundles) Reserved
1318 DBG_FAULT(37)
1319 FAULT(37)
1320
1321 .org ia64_ivt+0x6200
1322/////////////////////////////////////////////////////////////////////////////////////////
1323// 0x6200 Entry 38 (size 16 bundles) Reserved
1324 DBG_FAULT(38)
1325 FAULT(38)
1326
1327 .org ia64_ivt+0x6300
1328/////////////////////////////////////////////////////////////////////////////////////////
1329// 0x6300 Entry 39 (size 16 bundles) Reserved
1330 DBG_FAULT(39)
1331 FAULT(39)
1332
1333 .org ia64_ivt+0x6400
1334/////////////////////////////////////////////////////////////////////////////////////////
1335// 0x6400 Entry 40 (size 16 bundles) Reserved
1336 DBG_FAULT(40)
1337 FAULT(40)
1338
1339 .org ia64_ivt+0x6500
1340/////////////////////////////////////////////////////////////////////////////////////////
1341// 0x6500 Entry 41 (size 16 bundles) Reserved
1342 DBG_FAULT(41)
1343 FAULT(41)
1344
1345 .org ia64_ivt+0x6600
1346/////////////////////////////////////////////////////////////////////////////////////////
1347// 0x6600 Entry 42 (size 16 bundles) Reserved
1348 DBG_FAULT(42)
1349 FAULT(42)
1350
1351 .org ia64_ivt+0x6700
1352/////////////////////////////////////////////////////////////////////////////////////////
1353// 0x6700 Entry 43 (size 16 bundles) Reserved
1354 DBG_FAULT(43)
1355 FAULT(43)
1356
1357 .org ia64_ivt+0x6800
1358/////////////////////////////////////////////////////////////////////////////////////////
1359// 0x6800 Entry 44 (size 16 bundles) Reserved
1360 DBG_FAULT(44)
1361 FAULT(44)
1362
1363 .org ia64_ivt+0x6900
1364/////////////////////////////////////////////////////////////////////////////////////////
1365// 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)
1366ENTRY(ia32_exception)
1367 DBG_FAULT(45)
1368 FAULT(45)
1369END(ia32_exception)
1370
1371 .org ia64_ivt+0x6a00
1372/////////////////////////////////////////////////////////////////////////////////////////
1373// 0x6a00 Entry 46 (size 16 bundles) IA-32 Intercept (30,31,59,70,71)
1374ENTRY(ia32_intercept)
1375 DBG_FAULT(46)
1376#ifdef CONFIG_IA32_SUPPORT
1377 mov r31=pr
1378 mov r16=cr.isr
1379 ;;
1380 extr.u r17=r16,16,8 // get ISR.code
1381 mov r18=ar.eflag
1382 mov r19=cr.iim // old eflag value
1383 ;;
1384 cmp.ne p6,p0=2,r17
1385(p6) br.cond.spnt 1f // not a system flag fault
1386 xor r16=r18,r19
1387 ;;
1388 extr.u r17=r16,18,1 // get the eflags.ac bit
1389 ;;
1390 cmp.eq p6,p0=0,r17
1391(p6) br.cond.spnt 1f // eflags.ac bit didn't change
1392 ;;
1393 mov pr=r31,-1 // restore predicate registers
1394 rfi
1395
13961:
1397#endif // CONFIG_IA32_SUPPORT
1398 FAULT(46)
1399END(ia32_intercept)
1400
1401 .org ia64_ivt+0x6b00
1402/////////////////////////////////////////////////////////////////////////////////////////
1403// 0x6b00 Entry 47 (size 16 bundles) IA-32 Interrupt (74)
1404ENTRY(ia32_interrupt)
1405 DBG_FAULT(47)
1406#ifdef CONFIG_IA32_SUPPORT
1407 mov r31=pr
1408 br.sptk.many dispatch_to_ia32_handler
1409#else
1410 FAULT(47)
1411#endif
1412END(ia32_interrupt)
1413
1414 .org ia64_ivt+0x6c00
1415/////////////////////////////////////////////////////////////////////////////////////////
1416// 0x6c00 Entry 48 (size 16 bundles) Reserved
1417 DBG_FAULT(48)
1418 FAULT(48)
1419
1420 .org ia64_ivt+0x6d00
1421/////////////////////////////////////////////////////////////////////////////////////////
1422// 0x6d00 Entry 49 (size 16 bundles) Reserved
1423 DBG_FAULT(49)
1424 FAULT(49)
1425
1426 .org ia64_ivt+0x6e00
1427/////////////////////////////////////////////////////////////////////////////////////////
1428// 0x6e00 Entry 50 (size 16 bundles) Reserved
1429 DBG_FAULT(50)
1430 FAULT(50)
1431
1432 .org ia64_ivt+0x6f00
1433/////////////////////////////////////////////////////////////////////////////////////////
1434// 0x6f00 Entry 51 (size 16 bundles) Reserved
1435 DBG_FAULT(51)
1436 FAULT(51)
1437
1438 .org ia64_ivt+0x7000
1439/////////////////////////////////////////////////////////////////////////////////////////
1440// 0x7000 Entry 52 (size 16 bundles) Reserved
1441 DBG_FAULT(52)
1442 FAULT(52)
1443
1444 .org ia64_ivt+0x7100
1445/////////////////////////////////////////////////////////////////////////////////////////
1446// 0x7100 Entry 53 (size 16 bundles) Reserved
1447 DBG_FAULT(53)
1448 FAULT(53)
1449
1450 .org ia64_ivt+0x7200
1451/////////////////////////////////////////////////////////////////////////////////////////
1452// 0x7200 Entry 54 (size 16 bundles) Reserved
1453 DBG_FAULT(54)
1454 FAULT(54)
1455
1456 .org ia64_ivt+0x7300
1457/////////////////////////////////////////////////////////////////////////////////////////
1458// 0x7300 Entry 55 (size 16 bundles) Reserved
1459 DBG_FAULT(55)
1460 FAULT(55)
1461
1462 .org ia64_ivt+0x7400
1463/////////////////////////////////////////////////////////////////////////////////////////
1464// 0x7400 Entry 56 (size 16 bundles) Reserved
1465 DBG_FAULT(56)
1466 FAULT(56)
1467
1468 .org ia64_ivt+0x7500
1469/////////////////////////////////////////////////////////////////////////////////////////
1470// 0x7500 Entry 57 (size 16 bundles) Reserved
1471 DBG_FAULT(57)
1472 FAULT(57)
1473
1474 .org ia64_ivt+0x7600
1475/////////////////////////////////////////////////////////////////////////////////////////
1476// 0x7600 Entry 58 (size 16 bundles) Reserved
1477 DBG_FAULT(58)
1478 FAULT(58)
1479
1480 .org ia64_ivt+0x7700
1481/////////////////////////////////////////////////////////////////////////////////////////
1482// 0x7700 Entry 59 (size 16 bundles) Reserved
1483 DBG_FAULT(59)
1484 FAULT(59)
1485
1486 .org ia64_ivt+0x7800
1487/////////////////////////////////////////////////////////////////////////////////////////
1488// 0x7800 Entry 60 (size 16 bundles) Reserved
1489 DBG_FAULT(60)
1490 FAULT(60)
1491
1492 .org ia64_ivt+0x7900
1493/////////////////////////////////////////////////////////////////////////////////////////
1494// 0x7900 Entry 61 (size 16 bundles) Reserved
1495 DBG_FAULT(61)
1496 FAULT(61)
1497
1498 .org ia64_ivt+0x7a00
1499/////////////////////////////////////////////////////////////////////////////////////////
1500// 0x7a00 Entry 62 (size 16 bundles) Reserved
1501 DBG_FAULT(62)
1502 FAULT(62)
1503
1504 .org ia64_ivt+0x7b00
1505/////////////////////////////////////////////////////////////////////////////////////////
1506// 0x7b00 Entry 63 (size 16 bundles) Reserved
1507 DBG_FAULT(63)
1508 FAULT(63)
1509
1510 .org ia64_ivt+0x7c00
1511/////////////////////////////////////////////////////////////////////////////////////////
1512// 0x7c00 Entry 64 (size 16 bundles) Reserved
1513 DBG_FAULT(64)
1514 FAULT(64)
1515
1516 .org ia64_ivt+0x7d00
1517/////////////////////////////////////////////////////////////////////////////////////////
1518// 0x7d00 Entry 65 (size 16 bundles) Reserved
1519 DBG_FAULT(65)
1520 FAULT(65)
1521
1522 .org ia64_ivt+0x7e00
1523/////////////////////////////////////////////////////////////////////////////////////////
1524// 0x7e00 Entry 66 (size 16 bundles) Reserved
1525 DBG_FAULT(66)
1526 FAULT(66)
1527
1528 .org ia64_ivt+0x7f00
1529/////////////////////////////////////////////////////////////////////////////////////////
1530// 0x7f00 Entry 67 (size 16 bundles) Reserved
1531 DBG_FAULT(67)
1532 FAULT(67)
1533
1534#ifdef CONFIG_IA32_SUPPORT
1535
1536 /*
1537 * There is no particular reason for this code to be here, other than that
1538 * there happens to be space here that would go unused otherwise. If this
1539 * fault ever gets "unreserved", simply moved the following code to a more
1540 * suitable spot...
1541 */
1542
1543 // IA32 interrupt entry point
1544
1545ENTRY(dispatch_to_ia32_handler)
1546 SAVE_MIN
1547 ;;
1548 mov r14=cr.isr
1549 ssm psr.ic | PSR_DEFAULT_BITS
1550 ;;
1551 srlz.i // guarantee that interruption collection is on
1552 ;;
1553(p15) ssm psr.i
1554 adds r3=8,r2 // Base pointer for SAVE_REST
1555 ;;
1556 SAVE_REST
1557 ;;
1558 mov r15=0x80
1559 shr r14=r14,16 // Get interrupt number
1560 ;;
1561 cmp.ne p6,p0=r14,r15
1562(p6) br.call.dpnt.many b6=non_ia32_syscall
1563
1564 adds r14=IA64_PT_REGS_R8_OFFSET + 16,sp // 16 byte hole per SW conventions
1565 adds r15=IA64_PT_REGS_R1_OFFSET + 16,sp
1566 ;;
1567 cmp.eq pSys,pNonSys=r0,r0 // set pSys=1, pNonSys=0
1568 ld8 r8=[r14] // get r8
1569 ;;
1570 st8 [r15]=r8 // save original EAX in r1 (IA32 procs don't use the GP)
1571 ;;
1572 alloc r15=ar.pfs,0,0,6,0 // must first in an insn group
1573 ;;
1574 ld4 r8=[r14],8 // r8 == eax (syscall number)
1575 mov r15=IA32_NR_syscalls
1576 ;;
1577 cmp.ltu.unc p6,p7=r8,r15
1578 ld4 out1=[r14],8 // r9 == ecx
1579 ;;
1580 ld4 out2=[r14],8 // r10 == edx
1581 ;;
1582 ld4 out0=[r14] // r11 == ebx
1583 adds r14=(IA64_PT_REGS_R13_OFFSET) + 16,sp
1584 ;;
1585 ld4 out5=[r14],PT(R14)-PT(R13) // r13 == ebp
1586 ;;
1587 ld4 out3=[r14],PT(R15)-PT(R14) // r14 == esi
1588 adds r2=TI_FLAGS+IA64_TASK_SIZE,r13
1589 ;;
1590 ld4 out4=[r14] // r15 == edi
1591 movl r16=ia32_syscall_table
1592 ;;
1593(p6) shladd r16=r8,3,r16 // force ni_syscall if not valid syscall number
1594 ld4 r2=[r2] // r2 = current_thread_info()->flags
1595 ;;
1596 ld8 r16=[r16]
1597 and r2=_TIF_SYSCALL_TRACEAUDIT,r2 // mask trace or audit
1598 ;;
1599 mov b6=r16
1600 movl r15=ia32_ret_from_syscall
1601 cmp.eq p8,p0=r2,r0
1602 ;;
1603 mov rp=r15
1604(p8) br.call.sptk.many b6=b6
1605 br.cond.sptk ia32_trace_syscall
1606
1607non_ia32_syscall:
1608 alloc r15=ar.pfs,0,0,2,0
1609 mov out0=r14 // interrupt #
1610 add out1=16,sp // pointer to pt_regs
1611 ;; // avoid WAW on CFM
1612 br.call.sptk.many rp=ia32_bad_interrupt
1613.ret1: movl r15=ia64_leave_kernel
1614 ;;
1615 mov rp=r15
1616 br.ret.sptk.many rp
1617END(dispatch_to_ia32_handler)
1618
1619#endif /* CONFIG_IA32_SUPPORT */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-26 16:52:03 -0500