Merge git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux-2.6
[linux-2.6.git] / arch / ia64 / kernel / traps.c
1 /*
2  * Architecture-specific trap handling.
3  *
4  * Copyright (C) 1998-2003 Hewlett-Packard Co
5  *      David Mosberger-Tang <davidm@hpl.hp.com>
6  *
7  * 05/12/00 grao <goutham.rao@intel.com> : added isr in siginfo for SIGFPE
8  */
9
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/sched.h>
13 #include <linux/tty.h>
14 #include <linux/vt_kern.h>              /* For unblank_screen() */
15 #include <linux/module.h>       /* for EXPORT_SYMBOL */
16 #include <linux/hardirq.h>
17 #include <linux/kprobes.h>
18 #include <linux/delay.h>                /* for ssleep() */
19 #include <linux/kdebug.h>
20
21 #include <asm/fpswa.h>
22 #include <asm/ia32.h>
23 #include <asm/intrinsics.h>
24 #include <asm/processor.h>
25 #include <asm/uaccess.h>
26
27 fpswa_interface_t *fpswa_interface;
28 EXPORT_SYMBOL(fpswa_interface);
29
30 void __init
31 trap_init (void)
32 {
33         if (ia64_boot_param->fpswa)
34                 /* FPSWA fixup: make the interface pointer a kernel virtual address: */
35                 fpswa_interface = __va(ia64_boot_param->fpswa);
36 }
37
38 void
39 die (const char *str, struct pt_regs *regs, long err)
40 {
41         static struct {
42                 spinlock_t lock;
43                 u32 lock_owner;
44                 int lock_owner_depth;
45         } die = {
46                 .lock = __SPIN_LOCK_UNLOCKED(die.lock),
47                 .lock_owner = -1,
48                 .lock_owner_depth = 0
49         };
50         static int die_counter;
51         int cpu = get_cpu();
52
53         if (die.lock_owner != cpu) {
54                 console_verbose();
55                 spin_lock_irq(&die.lock);
56                 die.lock_owner = cpu;
57                 die.lock_owner_depth = 0;
58                 bust_spinlocks(1);
59         }
60         put_cpu();
61
62         if (++die.lock_owner_depth < 3) {
63                 printk("%s[%d]: %s %ld [%d]\n",
64                         current->comm, current->pid, str, err, ++die_counter);
65                 (void) notify_die(DIE_OOPS, (char *)str, regs, err, 255, SIGSEGV);
66                 show_regs(regs);
67         } else
68                 printk(KERN_ERR "Recursive die() failure, output suppressed\n");
69
70         bust_spinlocks(0);
71         die.lock_owner = -1;
72         spin_unlock_irq(&die.lock);
73
74         if (panic_on_oops)
75                 panic("Fatal exception");
76
77         do_exit(SIGSEGV);
78 }
79
80 void
81 die_if_kernel (char *str, struct pt_regs *regs, long err)
82 {
83         if (!user_mode(regs))
84                 die(str, regs, err);
85 }
86
87 void
88 __kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
89 {
90         siginfo_t siginfo;
91         int sig, code;
92
93         /* SIGILL, SIGFPE, SIGSEGV, and SIGBUS want these field initialized: */
94         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
95         siginfo.si_imm = break_num;
96         siginfo.si_flags = 0;           /* clear __ISR_VALID */
97         siginfo.si_isr = 0;
98
99         switch (break_num) {
100               case 0: /* unknown error (used by GCC for __builtin_abort()) */
101                 if (notify_die(DIE_BREAK, "break 0", regs, break_num, TRAP_BRKPT, SIGTRAP)
102                                 == NOTIFY_STOP)
103                         return;
104                 die_if_kernel("bugcheck!", regs, break_num);
105                 sig = SIGILL; code = ILL_ILLOPC;
106                 break;
107
108               case 1: /* integer divide by zero */
109                 sig = SIGFPE; code = FPE_INTDIV;
110                 break;
111
112               case 2: /* integer overflow */
113                 sig = SIGFPE; code = FPE_INTOVF;
114                 break;
115
116               case 3: /* range check/bounds check */
117                 sig = SIGFPE; code = FPE_FLTSUB;
118                 break;
119
120               case 4: /* null pointer dereference */
121                 sig = SIGSEGV; code = SEGV_MAPERR;
122                 break;
123
124               case 5: /* misaligned data */
125                 sig = SIGSEGV; code = BUS_ADRALN;
126                 break;
127
128               case 6: /* decimal overflow */
129                 sig = SIGFPE; code = __FPE_DECOVF;
130                 break;
131
132               case 7: /* decimal divide by zero */
133                 sig = SIGFPE; code = __FPE_DECDIV;
134                 break;
135
136               case 8: /* packed decimal error */
137                 sig = SIGFPE; code = __FPE_DECERR;
138                 break;
139
140               case 9: /* invalid ASCII digit */
141                 sig = SIGFPE; code = __FPE_INVASC;
142                 break;
143
144               case 10: /* invalid decimal digit */
145                 sig = SIGFPE; code = __FPE_INVDEC;
146                 break;
147
148               case 11: /* paragraph stack overflow */
149                 sig = SIGSEGV; code = __SEGV_PSTKOVF;
150                 break;
151
152               case 0x3f000 ... 0x3ffff: /* bundle-update in progress */
153                 sig = SIGILL; code = __ILL_BNDMOD;
154                 break;
155
156               default:
157                 if (break_num < 0x40000 || break_num > 0x100000)
158                         die_if_kernel("Bad break", regs, break_num);
159
160                 if (break_num < 0x80000) {
161                         sig = SIGILL; code = __ILL_BREAK;
162                 } else {
163                         if (notify_die(DIE_BREAK, "bad break", regs, break_num, TRAP_BRKPT, SIGTRAP)
164                                         == NOTIFY_STOP)
165                                 return;
166                         sig = SIGTRAP; code = TRAP_BRKPT;
167                 }
168         }
169         siginfo.si_signo = sig;
170         siginfo.si_errno = 0;
171         siginfo.si_code = code;
172         force_sig_info(sig, &siginfo, current);
173 }
174
175 /*
176  * disabled_fph_fault() is called when a user-level process attempts to access f32..f127
177  * and it doesn't own the fp-high register partition.  When this happens, we save the
178  * current fph partition in the task_struct of the fpu-owner (if necessary) and then load
179  * the fp-high partition of the current task (if necessary).  Note that the kernel has
180  * access to fph by the time we get here, as the IVT's "Disabled FP-Register" handler takes
181  * care of clearing psr.dfh.
182  */
183 static inline void
184 disabled_fph_fault (struct pt_regs *regs)
185 {
186         struct ia64_psr *psr = ia64_psr(regs);
187
188         /* first, grant user-level access to fph partition: */
189         psr->dfh = 0;
190
191         /*
192          * Make sure that no other task gets in on this processor
193          * while we're claiming the FPU
194          */
195         preempt_disable();
196 #ifndef CONFIG_SMP
197         {
198                 struct task_struct *fpu_owner
199                         = (struct task_struct *)ia64_get_kr(IA64_KR_FPU_OWNER);
200
201                 if (ia64_is_local_fpu_owner(current)) {
202                         preempt_enable_no_resched();
203                         return;
204                 }
205
206                 if (fpu_owner)
207                         ia64_flush_fph(fpu_owner);
208         }
209 #endif /* !CONFIG_SMP */
210         ia64_set_local_fpu_owner(current);
211         if ((current->thread.flags & IA64_THREAD_FPH_VALID) != 0) {
212                 __ia64_load_fpu(current->thread.fph);
213                 psr->mfh = 0;
214         } else {
215                 __ia64_init_fpu();
216                 /*
217                  * Set mfh because the state in thread.fph does not match the state in
218                  * the fph partition.
219                  */
220                 psr->mfh = 1;
221         }
222         preempt_enable_no_resched();
223 }
224
225 static inline int
226 fp_emulate (int fp_fault, void *bundle, long *ipsr, long *fpsr, long *isr, long *pr, long *ifs,
227             struct pt_regs *regs)
228 {
229         fp_state_t fp_state;
230         fpswa_ret_t ret;
231
232         if (!fpswa_interface)
233                 return -1;
234
235         memset(&fp_state, 0, sizeof(fp_state_t));
236
237         /*
238          * compute fp_state.  only FP registers f6 - f11 are used by the
239          * kernel, so set those bits in the mask and set the low volatile
240          * pointer to point to these registers.
241          */
242         fp_state.bitmask_low64 = 0xfc0;  /* bit6..bit11 */
243
244         fp_state.fp_state_low_volatile = (fp_state_low_volatile_t *) &regs->f6;
245         /*
246          * unsigned long (*EFI_FPSWA) (
247          *      unsigned long    trap_type,
248          *      void             *Bundle,
249          *      unsigned long    *pipsr,
250          *      unsigned long    *pfsr,
251          *      unsigned long    *pisr,
252          *      unsigned long    *ppreds,
253          *      unsigned long    *pifs,
254          *      void             *fp_state);
255          */
256         ret = (*fpswa_interface->fpswa)((unsigned long) fp_fault, bundle,
257                                         (unsigned long *) ipsr, (unsigned long *) fpsr,
258                                         (unsigned long *) isr, (unsigned long *) pr,
259                                         (unsigned long *) ifs, &fp_state);
260
261         return ret.status;
262 }
263
264 struct fpu_swa_msg {
265         unsigned long count;
266         unsigned long time;
267 };
268 static DEFINE_PER_CPU(struct fpu_swa_msg, cpulast);
269 DECLARE_PER_CPU(struct fpu_swa_msg, cpulast);
270 static struct fpu_swa_msg last __cacheline_aligned;
271
272
273 /*
274  * Handle floating-point assist faults and traps.
275  */
276 static int
277 handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr)
278 {
279         long exception, bundle[2];
280         unsigned long fault_ip;
281         struct siginfo siginfo;
282
283         fault_ip = regs->cr_iip;
284         if (!fp_fault && (ia64_psr(regs)->ri == 0))
285                 fault_ip -= 16;
286         if (copy_from_user(bundle, (void __user *) fault_ip, sizeof(bundle)))
287                 return -1;
288
289         if (!(current->thread.flags & IA64_THREAD_FPEMU_NOPRINT))  {
290                 unsigned long count, current_jiffies = jiffies;
291                 struct fpu_swa_msg *cp = &__get_cpu_var(cpulast);
292
293                 if (unlikely(current_jiffies > cp->time))
294                         cp->count = 0;
295                 if (unlikely(cp->count < 5)) {
296                         cp->count++;
297                         cp->time = current_jiffies + 5 * HZ;
298
299                         /* minimize races by grabbing a copy of count BEFORE checking last.time. */
300                         count = last.count;
301                         barrier();
302
303                         /*
304                          * Lower 4 bits are used as a count. Upper bits are a sequence
305                          * number that is updated when count is reset. The cmpxchg will
306                          * fail is seqno has changed. This minimizes mutiple cpus
307                          * reseting the count.
308                          */
309                         if (current_jiffies > last.time)
310                                 (void) cmpxchg_acq(&last.count, count, 16 + (count & ~15));
311
312                         /* used fetchadd to atomically update the count */
313                         if ((last.count & 15) < 5 && (ia64_fetchadd(1, &last.count, acq) & 15) < 5) {
314                                 last.time = current_jiffies + 5 * HZ;
315                                 printk(KERN_WARNING
316                                         "%s(%d): floating-point assist fault at ip %016lx, isr %016lx\n",
317                                         current->comm, current->pid, regs->cr_iip + ia64_psr(regs)->ri, isr);
318                         }
319                 }
320         }
321
322         exception = fp_emulate(fp_fault, bundle, &regs->cr_ipsr, &regs->ar_fpsr, &isr, &regs->pr,
323                                &regs->cr_ifs, regs);
324         if (fp_fault) {
325                 if (exception == 0) {
326                         /* emulation was successful */
327                         ia64_increment_ip(regs);
328                 } else if (exception == -1) {
329                         printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
330                         return -1;
331                 } else {
332                         /* is next instruction a trap? */
333                         if (exception & 2) {
334                                 ia64_increment_ip(regs);
335                         }
336                         siginfo.si_signo = SIGFPE;
337                         siginfo.si_errno = 0;
338                         siginfo.si_code = __SI_FAULT;   /* default code */
339                         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
340                         if (isr & 0x11) {
341                                 siginfo.si_code = FPE_FLTINV;
342                         } else if (isr & 0x22) {
343                                 /* denormal operand gets the same si_code as underflow 
344                                 * see arch/i386/kernel/traps.c:math_error()  */
345                                 siginfo.si_code = FPE_FLTUND;
346                         } else if (isr & 0x44) {
347                                 siginfo.si_code = FPE_FLTDIV;
348                         }
349                         siginfo.si_isr = isr;
350                         siginfo.si_flags = __ISR_VALID;
351                         siginfo.si_imm = 0;
352                         force_sig_info(SIGFPE, &siginfo, current);
353                 }
354         } else {
355                 if (exception == -1) {
356                         printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
357                         return -1;
358                 } else if (exception != 0) {
359                         /* raise exception */
360                         siginfo.si_signo = SIGFPE;
361                         siginfo.si_errno = 0;
362                         siginfo.si_code = __SI_FAULT;   /* default code */
363                         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
364                         if (isr & 0x880) {
365                                 siginfo.si_code = FPE_FLTOVF;
366                         } else if (isr & 0x1100) {
367                                 siginfo.si_code = FPE_FLTUND;
368                         } else if (isr & 0x2200) {
369                                 siginfo.si_code = FPE_FLTRES;
370                         }
371                         siginfo.si_isr = isr;
372                         siginfo.si_flags = __ISR_VALID;
373                         siginfo.si_imm = 0;
374                         force_sig_info(SIGFPE, &siginfo, current);
375                 }
376         }
377         return 0;
378 }
379
380 struct illegal_op_return {
381         unsigned long fkt, arg1, arg2, arg3;
382 };
383
384 struct illegal_op_return
385 ia64_illegal_op_fault (unsigned long ec, long arg1, long arg2, long arg3,
386                        long arg4, long arg5, long arg6, long arg7,
387                        struct pt_regs regs)
388 {
389         struct illegal_op_return rv;
390         struct siginfo si;
391         char buf[128];
392
393 #ifdef CONFIG_IA64_BRL_EMU
394         {
395                 extern struct illegal_op_return ia64_emulate_brl (struct pt_regs *, unsigned long);
396
397                 rv = ia64_emulate_brl(&regs, ec);
398                 if (rv.fkt != (unsigned long) -1)
399                         return rv;
400         }
401 #endif
402
403         sprintf(buf, "IA-64 Illegal operation fault");
404         die_if_kernel(buf, &regs, 0);
405
406         memset(&si, 0, sizeof(si));
407         si.si_signo = SIGILL;
408         si.si_code = ILL_ILLOPC;
409         si.si_addr = (void __user *) (regs.cr_iip + ia64_psr(&regs)->ri);
410         force_sig_info(SIGILL, &si, current);
411         rv.fkt = 0;
412         return rv;
413 }
414
415 void __kprobes
416 ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
417             unsigned long iim, unsigned long itir, long arg5, long arg6,
418             long arg7, struct pt_regs regs)
419 {
420         unsigned long code, error = isr, iip;
421         struct siginfo siginfo;
422         char buf[128];
423         int result, sig;
424         static const char *reason[] = {
425                 "IA-64 Illegal Operation fault",
426                 "IA-64 Privileged Operation fault",
427                 "IA-64 Privileged Register fault",
428                 "IA-64 Reserved Register/Field fault",
429                 "Disabled Instruction Set Transition fault",
430                 "Unknown fault 5", "Unknown fault 6", "Unknown fault 7", "Illegal Hazard fault",
431                 "Unknown fault 9", "Unknown fault 10", "Unknown fault 11", "Unknown fault 12",
432                 "Unknown fault 13", "Unknown fault 14", "Unknown fault 15"
433         };
434
435         if ((isr & IA64_ISR_NA) && ((isr & IA64_ISR_CODE_MASK) == IA64_ISR_CODE_LFETCH)) {
436                 /*
437                  * This fault was due to lfetch.fault, set "ed" bit in the psr to cancel
438                  * the lfetch.
439                  */
440                 ia64_psr(&regs)->ed = 1;
441                 return;
442         }
443
444         iip = regs.cr_iip + ia64_psr(&regs)->ri;
445
446         switch (vector) {
447               case 24: /* General Exception */
448                 code = (isr >> 4) & 0xf;
449                 sprintf(buf, "General Exception: %s%s", reason[code],
450                         (code == 3) ? ((isr & (1UL << 37))
451                                        ? " (RSE access)" : " (data access)") : "");
452                 if (code == 8) {
453 # ifdef CONFIG_IA64_PRINT_HAZARDS
454                         printk("%s[%d]: possible hazard @ ip=%016lx (pr = %016lx)\n",
455                                current->comm, current->pid,
456                                regs.cr_iip + ia64_psr(&regs)->ri, regs.pr);
457 # endif
458                         return;
459                 }
460                 break;
461
462               case 25: /* Disabled FP-Register */
463                 if (isr & 2) {
464                         disabled_fph_fault(&regs);
465                         return;
466                 }
467                 sprintf(buf, "Disabled FPL fault---not supposed to happen!");
468                 break;
469
470               case 26: /* NaT Consumption */
471                 if (user_mode(&regs)) {
472                         void __user *addr;
473
474                         if (((isr >> 4) & 0xf) == 2) {
475                                 /* NaT page consumption */
476                                 sig = SIGSEGV;
477                                 code = SEGV_ACCERR;
478                                 addr = (void __user *) ifa;
479                         } else {
480                                 /* register NaT consumption */
481                                 sig = SIGILL;
482                                 code = ILL_ILLOPN;
483                                 addr = (void __user *) (regs.cr_iip
484                                                         + ia64_psr(&regs)->ri);
485                         }
486                         siginfo.si_signo = sig;
487                         siginfo.si_code = code;
488                         siginfo.si_errno = 0;
489                         siginfo.si_addr = addr;
490                         siginfo.si_imm = vector;
491                         siginfo.si_flags = __ISR_VALID;
492                         siginfo.si_isr = isr;
493                         force_sig_info(sig, &siginfo, current);
494                         return;
495                 } else if (ia64_done_with_exception(&regs))
496                         return;
497                 sprintf(buf, "NaT consumption");
498                 break;
499
500               case 31: /* Unsupported Data Reference */
501                 if (user_mode(&regs)) {
502                         siginfo.si_signo = SIGILL;
503                         siginfo.si_code = ILL_ILLOPN;
504                         siginfo.si_errno = 0;
505                         siginfo.si_addr = (void __user *) iip;
506                         siginfo.si_imm = vector;
507                         siginfo.si_flags = __ISR_VALID;
508                         siginfo.si_isr = isr;
509                         force_sig_info(SIGILL, &siginfo, current);
510                         return;
511                 }
512                 sprintf(buf, "Unsupported data reference");
513                 break;
514
515               case 29: /* Debug */
516               case 35: /* Taken Branch Trap */
517               case 36: /* Single Step Trap */
518                 if (fsys_mode(current, &regs)) {
519                         extern char __kernel_syscall_via_break[];
520                         /*
521                          * Got a trap in fsys-mode: Taken Branch Trap
522                          * and Single Step trap need special handling;
523                          * Debug trap is ignored (we disable it here
524                          * and re-enable it in the lower-privilege trap).
525                          */
526                         if (unlikely(vector == 29)) {
527                                 set_thread_flag(TIF_DB_DISABLED);
528                                 ia64_psr(&regs)->db = 0;
529                                 ia64_psr(&regs)->lp = 1;
530                                 return;
531                         }
532                         /* re-do the system call via break 0x100000: */
533                         regs.cr_iip = (unsigned long) __kernel_syscall_via_break;
534                         ia64_psr(&regs)->ri = 0;
535                         ia64_psr(&regs)->cpl = 3;
536                         return;
537                 }
538                 switch (vector) {
539                       case 29:
540                         siginfo.si_code = TRAP_HWBKPT;
541 #ifdef CONFIG_ITANIUM
542                         /*
543                          * Erratum 10 (IFA may contain incorrect address) now has
544                          * "NoFix" status.  There are no plans for fixing this.
545                          */
546                         if (ia64_psr(&regs)->is == 0)
547                           ifa = regs.cr_iip;
548 #endif
549                         break;
550                       case 35: siginfo.si_code = TRAP_BRANCH; ifa = 0; break;
551                       case 36: siginfo.si_code = TRAP_TRACE; ifa = 0; break;
552                 }
553                 if (notify_die(DIE_FAULT, "ia64_fault", &regs, vector, siginfo.si_code, SIGTRAP)
554                                 == NOTIFY_STOP)
555                         return;
556                 siginfo.si_signo = SIGTRAP;
557                 siginfo.si_errno = 0;
558                 siginfo.si_addr  = (void __user *) ifa;
559                 siginfo.si_imm   = 0;
560                 siginfo.si_flags = __ISR_VALID;
561                 siginfo.si_isr   = isr;
562                 force_sig_info(SIGTRAP, &siginfo, current);
563                 return;
564
565               case 32: /* fp fault */
566               case 33: /* fp trap */
567                 result = handle_fpu_swa((vector == 32) ? 1 : 0, &regs, isr);
568                 if ((result < 0) || (current->thread.flags & IA64_THREAD_FPEMU_SIGFPE)) {
569                         siginfo.si_signo = SIGFPE;
570                         siginfo.si_errno = 0;
571                         siginfo.si_code = FPE_FLTINV;
572                         siginfo.si_addr = (void __user *) iip;
573                         siginfo.si_flags = __ISR_VALID;
574                         siginfo.si_isr = isr;
575                         siginfo.si_imm = 0;
576                         force_sig_info(SIGFPE, &siginfo, current);
577                 }
578                 return;
579
580               case 34:
581                 if (isr & 0x2) {
582                         /* Lower-Privilege Transfer Trap */
583
584                         /* If we disabled debug traps during an fsyscall,
585                          * re-enable them here.
586                          */
587                         if (test_thread_flag(TIF_DB_DISABLED)) {
588                                 clear_thread_flag(TIF_DB_DISABLED);
589                                 ia64_psr(&regs)->db = 1;
590                         }
591
592                         /*
593                          * Just clear PSR.lp and then return immediately:
594                          * all the interesting work (e.g., signal delivery)
595                          * is done in the kernel exit path.
596                          */
597                         ia64_psr(&regs)->lp = 0;
598                         return;
599                 } else {
600                         /* Unimplemented Instr. Address Trap */
601                         if (user_mode(&regs)) {
602                                 siginfo.si_signo = SIGILL;
603                                 siginfo.si_code = ILL_BADIADDR;
604                                 siginfo.si_errno = 0;
605                                 siginfo.si_flags = 0;
606                                 siginfo.si_isr = 0;
607                                 siginfo.si_imm = 0;
608                                 siginfo.si_addr = (void __user *) iip;
609                                 force_sig_info(SIGILL, &siginfo, current);
610                                 return;
611                         }
612                         sprintf(buf, "Unimplemented Instruction Address fault");
613                 }
614                 break;
615
616               case 45:
617 #ifdef CONFIG_IA32_SUPPORT
618                 if (ia32_exception(&regs, isr) == 0)
619                         return;
620 #endif
621                 printk(KERN_ERR "Unexpected IA-32 exception (Trap 45)\n");
622                 printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx\n",
623                        iip, ifa, isr);
624                 force_sig(SIGSEGV, current);
625                 break;
626
627               case 46:
628 #ifdef CONFIG_IA32_SUPPORT
629                 if (ia32_intercept(&regs, isr) == 0)
630                         return;
631 #endif
632                 printk(KERN_ERR "Unexpected IA-32 intercept trap (Trap 46)\n");
633                 printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx, iim - 0x%lx\n",
634                        iip, ifa, isr, iim);
635                 force_sig(SIGSEGV, current);
636                 return;
637
638               case 47:
639                 sprintf(buf, "IA-32 Interruption Fault (int 0x%lx)", isr >> 16);
640                 break;
641
642               default:
643                 sprintf(buf, "Fault %lu", vector);
644                 break;
645         }
646         die_if_kernel(buf, &regs, error);
647         force_sig(SIGILL, current);
648 }