Report that kernel is tainted if there was an OOPS
[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         add_taint(TAINT_DIE);
73         spin_unlock_irq(&die.lock);
74
75         if (panic_on_oops)
76                 panic("Fatal exception");
77
78         do_exit(SIGSEGV);
79 }
80
81 void
82 die_if_kernel (char *str, struct pt_regs *regs, long err)
83 {
84         if (!user_mode(regs))
85                 die(str, regs, err);
86 }
87
88 void
89 __kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
90 {
91         siginfo_t siginfo;
92         int sig, code;
93
94         /* SIGILL, SIGFPE, SIGSEGV, and SIGBUS want these field initialized: */
95         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
96         siginfo.si_imm = break_num;
97         siginfo.si_flags = 0;           /* clear __ISR_VALID */
98         siginfo.si_isr = 0;
99
100         switch (break_num) {
101               case 0: /* unknown error (used by GCC for __builtin_abort()) */
102                 if (notify_die(DIE_BREAK, "break 0", regs, break_num, TRAP_BRKPT, SIGTRAP)
103                                 == NOTIFY_STOP)
104                         return;
105                 die_if_kernel("bugcheck!", regs, break_num);
106                 sig = SIGILL; code = ILL_ILLOPC;
107                 break;
108
109               case 1: /* integer divide by zero */
110                 sig = SIGFPE; code = FPE_INTDIV;
111                 break;
112
113               case 2: /* integer overflow */
114                 sig = SIGFPE; code = FPE_INTOVF;
115                 break;
116
117               case 3: /* range check/bounds check */
118                 sig = SIGFPE; code = FPE_FLTSUB;
119                 break;
120
121               case 4: /* null pointer dereference */
122                 sig = SIGSEGV; code = SEGV_MAPERR;
123                 break;
124
125               case 5: /* misaligned data */
126                 sig = SIGSEGV; code = BUS_ADRALN;
127                 break;
128
129               case 6: /* decimal overflow */
130                 sig = SIGFPE; code = __FPE_DECOVF;
131                 break;
132
133               case 7: /* decimal divide by zero */
134                 sig = SIGFPE; code = __FPE_DECDIV;
135                 break;
136
137               case 8: /* packed decimal error */
138                 sig = SIGFPE; code = __FPE_DECERR;
139                 break;
140
141               case 9: /* invalid ASCII digit */
142                 sig = SIGFPE; code = __FPE_INVASC;
143                 break;
144
145               case 10: /* invalid decimal digit */
146                 sig = SIGFPE; code = __FPE_INVDEC;
147                 break;
148
149               case 11: /* paragraph stack overflow */
150                 sig = SIGSEGV; code = __SEGV_PSTKOVF;
151                 break;
152
153               case 0x3f000 ... 0x3ffff: /* bundle-update in progress */
154                 sig = SIGILL; code = __ILL_BNDMOD;
155                 break;
156
157               default:
158                 if (break_num < 0x40000 || break_num > 0x100000)
159                         die_if_kernel("Bad break", regs, break_num);
160
161                 if (break_num < 0x80000) {
162                         sig = SIGILL; code = __ILL_BREAK;
163                 } else {
164                         if (notify_die(DIE_BREAK, "bad break", regs, break_num, TRAP_BRKPT, SIGTRAP)
165                                         == NOTIFY_STOP)
166                                 return;
167                         sig = SIGTRAP; code = TRAP_BRKPT;
168                 }
169         }
170         siginfo.si_signo = sig;
171         siginfo.si_errno = 0;
172         siginfo.si_code = code;
173         force_sig_info(sig, &siginfo, current);
174 }
175
176 /*
177  * disabled_fph_fault() is called when a user-level process attempts to access f32..f127
178  * and it doesn't own the fp-high register partition.  When this happens, we save the
179  * current fph partition in the task_struct of the fpu-owner (if necessary) and then load
180  * the fp-high partition of the current task (if necessary).  Note that the kernel has
181  * access to fph by the time we get here, as the IVT's "Disabled FP-Register" handler takes
182  * care of clearing psr.dfh.
183  */
184 static inline void
185 disabled_fph_fault (struct pt_regs *regs)
186 {
187         struct ia64_psr *psr = ia64_psr(regs);
188
189         /* first, grant user-level access to fph partition: */
190         psr->dfh = 0;
191
192         /*
193          * Make sure that no other task gets in on this processor
194          * while we're claiming the FPU
195          */
196         preempt_disable();
197 #ifndef CONFIG_SMP
198         {
199                 struct task_struct *fpu_owner
200                         = (struct task_struct *)ia64_get_kr(IA64_KR_FPU_OWNER);
201
202                 if (ia64_is_local_fpu_owner(current)) {
203                         preempt_enable_no_resched();
204                         return;
205                 }
206
207                 if (fpu_owner)
208                         ia64_flush_fph(fpu_owner);
209         }
210 #endif /* !CONFIG_SMP */
211         ia64_set_local_fpu_owner(current);
212         if ((current->thread.flags & IA64_THREAD_FPH_VALID) != 0) {
213                 __ia64_load_fpu(current->thread.fph);
214                 psr->mfh = 0;
215         } else {
216                 __ia64_init_fpu();
217                 /*
218                  * Set mfh because the state in thread.fph does not match the state in
219                  * the fph partition.
220                  */
221                 psr->mfh = 1;
222         }
223         preempt_enable_no_resched();
224 }
225
226 static inline int
227 fp_emulate (int fp_fault, void *bundle, long *ipsr, long *fpsr, long *isr, long *pr, long *ifs,
228             struct pt_regs *regs)
229 {
230         fp_state_t fp_state;
231         fpswa_ret_t ret;
232
233         if (!fpswa_interface)
234                 return -1;
235
236         memset(&fp_state, 0, sizeof(fp_state_t));
237
238         /*
239          * compute fp_state.  only FP registers f6 - f11 are used by the
240          * kernel, so set those bits in the mask and set the low volatile
241          * pointer to point to these registers.
242          */
243         fp_state.bitmask_low64 = 0xfc0;  /* bit6..bit11 */
244
245         fp_state.fp_state_low_volatile = (fp_state_low_volatile_t *) &regs->f6;
246         /*
247          * unsigned long (*EFI_FPSWA) (
248          *      unsigned long    trap_type,
249          *      void             *Bundle,
250          *      unsigned long    *pipsr,
251          *      unsigned long    *pfsr,
252          *      unsigned long    *pisr,
253          *      unsigned long    *ppreds,
254          *      unsigned long    *pifs,
255          *      void             *fp_state);
256          */
257         ret = (*fpswa_interface->fpswa)((unsigned long) fp_fault, bundle,
258                                         (unsigned long *) ipsr, (unsigned long *) fpsr,
259                                         (unsigned long *) isr, (unsigned long *) pr,
260                                         (unsigned long *) ifs, &fp_state);
261
262         return ret.status;
263 }
264
265 struct fpu_swa_msg {
266         unsigned long count;
267         unsigned long time;
268 };
269 static DEFINE_PER_CPU(struct fpu_swa_msg, cpulast);
270 DECLARE_PER_CPU(struct fpu_swa_msg, cpulast);
271 static struct fpu_swa_msg last __cacheline_aligned;
272
273
274 /*
275  * Handle floating-point assist faults and traps.
276  */
277 static int
278 handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr)
279 {
280         long exception, bundle[2];
281         unsigned long fault_ip;
282         struct siginfo siginfo;
283
284         fault_ip = regs->cr_iip;
285         if (!fp_fault && (ia64_psr(regs)->ri == 0))
286                 fault_ip -= 16;
287         if (copy_from_user(bundle, (void __user *) fault_ip, sizeof(bundle)))
288                 return -1;
289
290         if (!(current->thread.flags & IA64_THREAD_FPEMU_NOPRINT))  {
291                 unsigned long count, current_jiffies = jiffies;
292                 struct fpu_swa_msg *cp = &__get_cpu_var(cpulast);
293
294                 if (unlikely(current_jiffies > cp->time))
295                         cp->count = 0;
296                 if (unlikely(cp->count < 5)) {
297                         cp->count++;
298                         cp->time = current_jiffies + 5 * HZ;
299
300                         /* minimize races by grabbing a copy of count BEFORE checking last.time. */
301                         count = last.count;
302                         barrier();
303
304                         /*
305                          * Lower 4 bits are used as a count. Upper bits are a sequence
306                          * number that is updated when count is reset. The cmpxchg will
307                          * fail is seqno has changed. This minimizes mutiple cpus
308                          * resetting the count.
309                          */
310                         if (current_jiffies > last.time)
311                                 (void) cmpxchg_acq(&last.count, count, 16 + (count & ~15));
312
313                         /* used fetchadd to atomically update the count */
314                         if ((last.count & 15) < 5 && (ia64_fetchadd(1, &last.count, acq) & 15) < 5) {
315                                 last.time = current_jiffies + 5 * HZ;
316                                 printk(KERN_WARNING
317                                         "%s(%d): floating-point assist fault at ip %016lx, isr %016lx\n",
318                                         current->comm, current->pid, regs->cr_iip + ia64_psr(regs)->ri, isr);
319                         }
320                 }
321         }
322
323         exception = fp_emulate(fp_fault, bundle, &regs->cr_ipsr, &regs->ar_fpsr, &isr, &regs->pr,
324                                &regs->cr_ifs, regs);
325         if (fp_fault) {
326                 if (exception == 0) {
327                         /* emulation was successful */
328                         ia64_increment_ip(regs);
329                 } else if (exception == -1) {
330                         printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
331                         return -1;
332                 } else {
333                         /* is next instruction a trap? */
334                         if (exception & 2) {
335                                 ia64_increment_ip(regs);
336                         }
337                         siginfo.si_signo = SIGFPE;
338                         siginfo.si_errno = 0;
339                         siginfo.si_code = __SI_FAULT;   /* default code */
340                         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
341                         if (isr & 0x11) {
342                                 siginfo.si_code = FPE_FLTINV;
343                         } else if (isr & 0x22) {
344                                 /* denormal operand gets the same si_code as underflow 
345                                 * see arch/i386/kernel/traps.c:math_error()  */
346                                 siginfo.si_code = FPE_FLTUND;
347                         } else if (isr & 0x44) {
348                                 siginfo.si_code = FPE_FLTDIV;
349                         }
350                         siginfo.si_isr = isr;
351                         siginfo.si_flags = __ISR_VALID;
352                         siginfo.si_imm = 0;
353                         force_sig_info(SIGFPE, &siginfo, current);
354                 }
355         } else {
356                 if (exception == -1) {
357                         printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
358                         return -1;
359                 } else if (exception != 0) {
360                         /* raise exception */
361                         siginfo.si_signo = SIGFPE;
362                         siginfo.si_errno = 0;
363                         siginfo.si_code = __SI_FAULT;   /* default code */
364                         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
365                         if (isr & 0x880) {
366                                 siginfo.si_code = FPE_FLTOVF;
367                         } else if (isr & 0x1100) {
368                                 siginfo.si_code = FPE_FLTUND;
369                         } else if (isr & 0x2200) {
370                                 siginfo.si_code = FPE_FLTRES;
371                         }
372                         siginfo.si_isr = isr;
373                         siginfo.si_flags = __ISR_VALID;
374                         siginfo.si_imm = 0;
375                         force_sig_info(SIGFPE, &siginfo, current);
376                 }
377         }
378         return 0;
379 }
380
381 struct illegal_op_return {
382         unsigned long fkt, arg1, arg2, arg3;
383 };
384
385 struct illegal_op_return
386 ia64_illegal_op_fault (unsigned long ec, long arg1, long arg2, long arg3,
387                        long arg4, long arg5, long arg6, long arg7,
388                        struct pt_regs regs)
389 {
390         struct illegal_op_return rv;
391         struct siginfo si;
392         char buf[128];
393
394 #ifdef CONFIG_IA64_BRL_EMU
395         {
396                 extern struct illegal_op_return ia64_emulate_brl (struct pt_regs *, unsigned long);
397
398                 rv = ia64_emulate_brl(&regs, ec);
399                 if (rv.fkt != (unsigned long) -1)
400                         return rv;
401         }
402 #endif
403
404         sprintf(buf, "IA-64 Illegal operation fault");
405         die_if_kernel(buf, &regs, 0);
406
407         memset(&si, 0, sizeof(si));
408         si.si_signo = SIGILL;
409         si.si_code = ILL_ILLOPC;
410         si.si_addr = (void __user *) (regs.cr_iip + ia64_psr(&regs)->ri);
411         force_sig_info(SIGILL, &si, current);
412         rv.fkt = 0;
413         return rv;
414 }
415
416 void __kprobes
417 ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
418             unsigned long iim, unsigned long itir, long arg5, long arg6,
419             long arg7, struct pt_regs regs)
420 {
421         unsigned long code, error = isr, iip;
422         struct siginfo siginfo;
423         char buf[128];
424         int result, sig;
425         static const char *reason[] = {
426                 "IA-64 Illegal Operation fault",
427                 "IA-64 Privileged Operation fault",
428                 "IA-64 Privileged Register fault",
429                 "IA-64 Reserved Register/Field fault",
430                 "Disabled Instruction Set Transition fault",
431                 "Unknown fault 5", "Unknown fault 6", "Unknown fault 7", "Illegal Hazard fault",
432                 "Unknown fault 9", "Unknown fault 10", "Unknown fault 11", "Unknown fault 12",
433                 "Unknown fault 13", "Unknown fault 14", "Unknown fault 15"
434         };
435
436         if ((isr & IA64_ISR_NA) && ((isr & IA64_ISR_CODE_MASK) == IA64_ISR_CODE_LFETCH)) {
437                 /*
438                  * This fault was due to lfetch.fault, set "ed" bit in the psr to cancel
439                  * the lfetch.
440                  */
441                 ia64_psr(&regs)->ed = 1;
442                 return;
443         }
444
445         iip = regs.cr_iip + ia64_psr(&regs)->ri;
446
447         switch (vector) {
448               case 24: /* General Exception */
449                 code = (isr >> 4) & 0xf;
450                 sprintf(buf, "General Exception: %s%s", reason[code],
451                         (code == 3) ? ((isr & (1UL << 37))
452                                        ? " (RSE access)" : " (data access)") : "");
453                 if (code == 8) {
454 # ifdef CONFIG_IA64_PRINT_HAZARDS
455                         printk("%s[%d]: possible hazard @ ip=%016lx (pr = %016lx)\n",
456                                current->comm, current->pid,
457                                regs.cr_iip + ia64_psr(&regs)->ri, regs.pr);
458 # endif
459                         return;
460                 }
461                 break;
462
463               case 25: /* Disabled FP-Register */
464                 if (isr & 2) {
465                         disabled_fph_fault(&regs);
466                         return;
467                 }
468                 sprintf(buf, "Disabled FPL fault---not supposed to happen!");
469                 break;
470
471               case 26: /* NaT Consumption */
472                 if (user_mode(&regs)) {
473                         void __user *addr;
474
475                         if (((isr >> 4) & 0xf) == 2) {
476                                 /* NaT page consumption */
477                                 sig = SIGSEGV;
478                                 code = SEGV_ACCERR;
479                                 addr = (void __user *) ifa;
480                         } else {
481                                 /* register NaT consumption */
482                                 sig = SIGILL;
483                                 code = ILL_ILLOPN;
484                                 addr = (void __user *) (regs.cr_iip
485                                                         + ia64_psr(&regs)->ri);
486                         }
487                         siginfo.si_signo = sig;
488                         siginfo.si_code = code;
489                         siginfo.si_errno = 0;
490                         siginfo.si_addr = addr;
491                         siginfo.si_imm = vector;
492                         siginfo.si_flags = __ISR_VALID;
493                         siginfo.si_isr = isr;
494                         force_sig_info(sig, &siginfo, current);
495                         return;
496                 } else if (ia64_done_with_exception(&regs))
497                         return;
498                 sprintf(buf, "NaT consumption");
499                 break;
500
501               case 31: /* Unsupported Data Reference */
502                 if (user_mode(&regs)) {
503                         siginfo.si_signo = SIGILL;
504                         siginfo.si_code = ILL_ILLOPN;
505                         siginfo.si_errno = 0;
506                         siginfo.si_addr = (void __user *) iip;
507                         siginfo.si_imm = vector;
508                         siginfo.si_flags = __ISR_VALID;
509                         siginfo.si_isr = isr;
510                         force_sig_info(SIGILL, &siginfo, current);
511                         return;
512                 }
513                 sprintf(buf, "Unsupported data reference");
514                 break;
515
516               case 29: /* Debug */
517               case 35: /* Taken Branch Trap */
518               case 36: /* Single Step Trap */
519                 if (fsys_mode(current, &regs)) {
520                         extern char __kernel_syscall_via_break[];
521                         /*
522                          * Got a trap in fsys-mode: Taken Branch Trap
523                          * and Single Step trap need special handling;
524                          * Debug trap is ignored (we disable it here
525                          * and re-enable it in the lower-privilege trap).
526                          */
527                         if (unlikely(vector == 29)) {
528                                 set_thread_flag(TIF_DB_DISABLED);
529                                 ia64_psr(&regs)->db = 0;
530                                 ia64_psr(&regs)->lp = 1;
531                                 return;
532                         }
533                         /* re-do the system call via break 0x100000: */
534                         regs.cr_iip = (unsigned long) __kernel_syscall_via_break;
535                         ia64_psr(&regs)->ri = 0;
536                         ia64_psr(&regs)->cpl = 3;
537                         return;
538                 }
539                 switch (vector) {
540                       case 29:
541                         siginfo.si_code = TRAP_HWBKPT;
542 #ifdef CONFIG_ITANIUM
543                         /*
544                          * Erratum 10 (IFA may contain incorrect address) now has
545                          * "NoFix" status.  There are no plans for fixing this.
546                          */
547                         if (ia64_psr(&regs)->is == 0)
548                           ifa = regs.cr_iip;
549 #endif
550                         break;
551                       case 35: siginfo.si_code = TRAP_BRANCH; ifa = 0; break;
552                       case 36: siginfo.si_code = TRAP_TRACE; ifa = 0; break;
553                 }
554                 if (notify_die(DIE_FAULT, "ia64_fault", &regs, vector, siginfo.si_code, SIGTRAP)
555                                 == NOTIFY_STOP)
556                         return;
557                 siginfo.si_signo = SIGTRAP;
558                 siginfo.si_errno = 0;
559                 siginfo.si_addr  = (void __user *) ifa;
560                 siginfo.si_imm   = 0;
561                 siginfo.si_flags = __ISR_VALID;
562                 siginfo.si_isr   = isr;
563                 force_sig_info(SIGTRAP, &siginfo, current);
564                 return;
565
566               case 32: /* fp fault */
567               case 33: /* fp trap */
568                 result = handle_fpu_swa((vector == 32) ? 1 : 0, &regs, isr);
569                 if ((result < 0) || (current->thread.flags & IA64_THREAD_FPEMU_SIGFPE)) {
570                         siginfo.si_signo = SIGFPE;
571                         siginfo.si_errno = 0;
572                         siginfo.si_code = FPE_FLTINV;
573                         siginfo.si_addr = (void __user *) iip;
574                         siginfo.si_flags = __ISR_VALID;
575                         siginfo.si_isr = isr;
576                         siginfo.si_imm = 0;
577                         force_sig_info(SIGFPE, &siginfo, current);
578                 }
579                 return;
580
581               case 34:
582                 if (isr & 0x2) {
583                         /* Lower-Privilege Transfer Trap */
584
585                         /* If we disabled debug traps during an fsyscall,
586                          * re-enable them here.
587                          */
588                         if (test_thread_flag(TIF_DB_DISABLED)) {
589                                 clear_thread_flag(TIF_DB_DISABLED);
590                                 ia64_psr(&regs)->db = 1;
591                         }
592
593                         /*
594                          * Just clear PSR.lp and then return immediately:
595                          * all the interesting work (e.g., signal delivery)
596                          * is done in the kernel exit path.
597                          */
598                         ia64_psr(&regs)->lp = 0;
599                         return;
600                 } else {
601                         /* Unimplemented Instr. Address Trap */
602                         if (user_mode(&regs)) {
603                                 siginfo.si_signo = SIGILL;
604                                 siginfo.si_code = ILL_BADIADDR;
605                                 siginfo.si_errno = 0;
606                                 siginfo.si_flags = 0;
607                                 siginfo.si_isr = 0;
608                                 siginfo.si_imm = 0;
609                                 siginfo.si_addr = (void __user *) iip;
610                                 force_sig_info(SIGILL, &siginfo, current);
611                                 return;
612                         }
613                         sprintf(buf, "Unimplemented Instruction Address fault");
614                 }
615                 break;
616
617               case 45:
618 #ifdef CONFIG_IA32_SUPPORT
619                 if (ia32_exception(&regs, isr) == 0)
620                         return;
621 #endif
622                 printk(KERN_ERR "Unexpected IA-32 exception (Trap 45)\n");
623                 printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx\n",
624                        iip, ifa, isr);
625                 force_sig(SIGSEGV, current);
626                 break;
627
628               case 46:
629 #ifdef CONFIG_IA32_SUPPORT
630                 if (ia32_intercept(&regs, isr) == 0)
631                         return;
632 #endif
633                 printk(KERN_ERR "Unexpected IA-32 intercept trap (Trap 46)\n");
634                 printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx, iim - 0x%lx\n",
635                        iip, ifa, isr, iim);
636                 force_sig(SIGSEGV, current);
637                 return;
638
639               case 47:
640                 sprintf(buf, "IA-32 Interruption Fault (int 0x%lx)", isr >> 16);
641                 break;
642
643               default:
644                 sprintf(buf, "Fault %lu", vector);
645                 break;
646         }
647         die_if_kernel(buf, &regs, error);
648         force_sig(SIGILL, current);
649 }