Make do_execve() take a const filename pointer
[linux-3.10.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/intrinsics.h>
23 #include <asm/processor.h>
24 #include <asm/uaccess.h>
25
26 fpswa_interface_t *fpswa_interface;
27 EXPORT_SYMBOL(fpswa_interface);
28
29 void __init
30 trap_init (void)
31 {
32         if (ia64_boot_param->fpswa)
33                 /* FPSWA fixup: make the interface pointer a kernel virtual address: */
34                 fpswa_interface = __va(ia64_boot_param->fpswa);
35 }
36
37 int
38 die (const char *str, struct pt_regs *regs, long err)
39 {
40         static struct {
41                 spinlock_t lock;
42                 u32 lock_owner;
43                 int lock_owner_depth;
44         } die = {
45                 .lock = __SPIN_LOCK_UNLOCKED(die.lock),
46                 .lock_owner = -1,
47                 .lock_owner_depth = 0
48         };
49         static int die_counter;
50         int cpu = get_cpu();
51
52         if (die.lock_owner != cpu) {
53                 console_verbose();
54                 spin_lock_irq(&die.lock);
55                 die.lock_owner = cpu;
56                 die.lock_owner_depth = 0;
57                 bust_spinlocks(1);
58         }
59         put_cpu();
60
61         if (++die.lock_owner_depth < 3) {
62                 printk("%s[%d]: %s %ld [%d]\n",
63                 current->comm, task_pid_nr(current), str, err, ++die_counter);
64                 if (notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV)
65                     != NOTIFY_STOP)
66                         show_regs(regs);
67                 else
68                         regs = NULL;
69         } else
70                 printk(KERN_ERR "Recursive die() failure, output suppressed\n");
71
72         bust_spinlocks(0);
73         die.lock_owner = -1;
74         add_taint(TAINT_DIE);
75         spin_unlock_irq(&die.lock);
76
77         if (!regs)
78                 return 1;
79
80         if (panic_on_oops)
81                 panic("Fatal exception");
82
83         do_exit(SIGSEGV);
84         return 0;
85 }
86
87 int
88 die_if_kernel (char *str, struct pt_regs *regs, long err)
89 {
90         if (!user_mode(regs))
91                 return die(str, regs, err);
92         return 0;
93 }
94
95 void
96 __kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
97 {
98         siginfo_t siginfo;
99         int sig, code;
100
101         /* SIGILL, SIGFPE, SIGSEGV, and SIGBUS want these field initialized: */
102         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
103         siginfo.si_imm = break_num;
104         siginfo.si_flags = 0;           /* clear __ISR_VALID */
105         siginfo.si_isr = 0;
106
107         switch (break_num) {
108               case 0: /* unknown error (used by GCC for __builtin_abort()) */
109                 if (notify_die(DIE_BREAK, "break 0", regs, break_num, TRAP_BRKPT, SIGTRAP)
110                                 == NOTIFY_STOP)
111                         return;
112                 if (die_if_kernel("bugcheck!", regs, break_num))
113                         return;
114                 sig = SIGILL; code = ILL_ILLOPC;
115                 break;
116
117               case 1: /* integer divide by zero */
118                 sig = SIGFPE; code = FPE_INTDIV;
119                 break;
120
121               case 2: /* integer overflow */
122                 sig = SIGFPE; code = FPE_INTOVF;
123                 break;
124
125               case 3: /* range check/bounds check */
126                 sig = SIGFPE; code = FPE_FLTSUB;
127                 break;
128
129               case 4: /* null pointer dereference */
130                 sig = SIGSEGV; code = SEGV_MAPERR;
131                 break;
132
133               case 5: /* misaligned data */
134                 sig = SIGSEGV; code = BUS_ADRALN;
135                 break;
136
137               case 6: /* decimal overflow */
138                 sig = SIGFPE; code = __FPE_DECOVF;
139                 break;
140
141               case 7: /* decimal divide by zero */
142                 sig = SIGFPE; code = __FPE_DECDIV;
143                 break;
144
145               case 8: /* packed decimal error */
146                 sig = SIGFPE; code = __FPE_DECERR;
147                 break;
148
149               case 9: /* invalid ASCII digit */
150                 sig = SIGFPE; code = __FPE_INVASC;
151                 break;
152
153               case 10: /* invalid decimal digit */
154                 sig = SIGFPE; code = __FPE_INVDEC;
155                 break;
156
157               case 11: /* paragraph stack overflow */
158                 sig = SIGSEGV; code = __SEGV_PSTKOVF;
159                 break;
160
161               case 0x3f000 ... 0x3ffff: /* bundle-update in progress */
162                 sig = SIGILL; code = __ILL_BNDMOD;
163                 break;
164
165               default:
166                 if ((break_num < 0x40000 || break_num > 0x100000)
167                     && die_if_kernel("Bad break", regs, break_num))
168                         return;
169
170                 if (break_num < 0x80000) {
171                         sig = SIGILL; code = __ILL_BREAK;
172                 } else {
173                         if (notify_die(DIE_BREAK, "bad break", regs, break_num, TRAP_BRKPT, SIGTRAP)
174                                         == NOTIFY_STOP)
175                                 return;
176                         sig = SIGTRAP; code = TRAP_BRKPT;
177                 }
178         }
179         siginfo.si_signo = sig;
180         siginfo.si_errno = 0;
181         siginfo.si_code = code;
182         force_sig_info(sig, &siginfo, current);
183 }
184
185 /*
186  * disabled_fph_fault() is called when a user-level process attempts to access f32..f127
187  * and it doesn't own the fp-high register partition.  When this happens, we save the
188  * current fph partition in the task_struct of the fpu-owner (if necessary) and then load
189  * the fp-high partition of the current task (if necessary).  Note that the kernel has
190  * access to fph by the time we get here, as the IVT's "Disabled FP-Register" handler takes
191  * care of clearing psr.dfh.
192  */
193 static inline void
194 disabled_fph_fault (struct pt_regs *regs)
195 {
196         struct ia64_psr *psr = ia64_psr(regs);
197
198         /* first, grant user-level access to fph partition: */
199         psr->dfh = 0;
200
201         /*
202          * Make sure that no other task gets in on this processor
203          * while we're claiming the FPU
204          */
205         preempt_disable();
206 #ifndef CONFIG_SMP
207         {
208                 struct task_struct *fpu_owner
209                         = (struct task_struct *)ia64_get_kr(IA64_KR_FPU_OWNER);
210
211                 if (ia64_is_local_fpu_owner(current)) {
212                         preempt_enable_no_resched();
213                         return;
214                 }
215
216                 if (fpu_owner)
217                         ia64_flush_fph(fpu_owner);
218         }
219 #endif /* !CONFIG_SMP */
220         ia64_set_local_fpu_owner(current);
221         if ((current->thread.flags & IA64_THREAD_FPH_VALID) != 0) {
222                 __ia64_load_fpu(current->thread.fph);
223                 psr->mfh = 0;
224         } else {
225                 __ia64_init_fpu();
226                 /*
227                  * Set mfh because the state in thread.fph does not match the state in
228                  * the fph partition.
229                  */
230                 psr->mfh = 1;
231         }
232         preempt_enable_no_resched();
233 }
234
235 static inline int
236 fp_emulate (int fp_fault, void *bundle, long *ipsr, long *fpsr, long *isr, long *pr, long *ifs,
237             struct pt_regs *regs)
238 {
239         fp_state_t fp_state;
240         fpswa_ret_t ret;
241
242         if (!fpswa_interface)
243                 return -1;
244
245         memset(&fp_state, 0, sizeof(fp_state_t));
246
247         /*
248          * compute fp_state.  only FP registers f6 - f11 are used by the
249          * kernel, so set those bits in the mask and set the low volatile
250          * pointer to point to these registers.
251          */
252         fp_state.bitmask_low64 = 0xfc0;  /* bit6..bit11 */
253
254         fp_state.fp_state_low_volatile = (fp_state_low_volatile_t *) &regs->f6;
255         /*
256          * unsigned long (*EFI_FPSWA) (
257          *      unsigned long    trap_type,
258          *      void             *Bundle,
259          *      unsigned long    *pipsr,
260          *      unsigned long    *pfsr,
261          *      unsigned long    *pisr,
262          *      unsigned long    *ppreds,
263          *      unsigned long    *pifs,
264          *      void             *fp_state);
265          */
266         ret = (*fpswa_interface->fpswa)((unsigned long) fp_fault, bundle,
267                                         (unsigned long *) ipsr, (unsigned long *) fpsr,
268                                         (unsigned long *) isr, (unsigned long *) pr,
269                                         (unsigned long *) ifs, &fp_state);
270
271         return ret.status;
272 }
273
274 struct fpu_swa_msg {
275         unsigned long count;
276         unsigned long time;
277 };
278 static DEFINE_PER_CPU(struct fpu_swa_msg, cpulast);
279 DECLARE_PER_CPU(struct fpu_swa_msg, cpulast);
280 static struct fpu_swa_msg last __cacheline_aligned;
281
282
283 /*
284  * Handle floating-point assist faults and traps.
285  */
286 static int
287 handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr)
288 {
289         long exception, bundle[2];
290         unsigned long fault_ip;
291         struct siginfo siginfo;
292
293         fault_ip = regs->cr_iip;
294         if (!fp_fault && (ia64_psr(regs)->ri == 0))
295                 fault_ip -= 16;
296         if (copy_from_user(bundle, (void __user *) fault_ip, sizeof(bundle)))
297                 return -1;
298
299         if (!(current->thread.flags & IA64_THREAD_FPEMU_NOPRINT))  {
300                 unsigned long count, current_jiffies = jiffies;
301                 struct fpu_swa_msg *cp = &__get_cpu_var(cpulast);
302
303                 if (unlikely(current_jiffies > cp->time))
304                         cp->count = 0;
305                 if (unlikely(cp->count < 5)) {
306                         cp->count++;
307                         cp->time = current_jiffies + 5 * HZ;
308
309                         /* minimize races by grabbing a copy of count BEFORE checking last.time. */
310                         count = last.count;
311                         barrier();
312
313                         /*
314                          * Lower 4 bits are used as a count. Upper bits are a sequence
315                          * number that is updated when count is reset. The cmpxchg will
316                          * fail is seqno has changed. This minimizes mutiple cpus
317                          * resetting the count.
318                          */
319                         if (current_jiffies > last.time)
320                                 (void) cmpxchg_acq(&last.count, count, 16 + (count & ~15));
321
322                         /* used fetchadd to atomically update the count */
323                         if ((last.count & 15) < 5 && (ia64_fetchadd(1, &last.count, acq) & 15) < 5) {
324                                 last.time = current_jiffies + 5 * HZ;
325                                 printk(KERN_WARNING
326                                         "%s(%d): floating-point assist fault at ip %016lx, isr %016lx\n",
327                                         current->comm, task_pid_nr(current), regs->cr_iip + ia64_psr(regs)->ri, isr);
328                         }
329                 }
330         }
331
332         exception = fp_emulate(fp_fault, bundle, &regs->cr_ipsr, &regs->ar_fpsr, &isr, &regs->pr,
333                                &regs->cr_ifs, regs);
334         if (fp_fault) {
335                 if (exception == 0) {
336                         /* emulation was successful */
337                         ia64_increment_ip(regs);
338                 } else if (exception == -1) {
339                         printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
340                         return -1;
341                 } else {
342                         /* is next instruction a trap? */
343                         if (exception & 2) {
344                                 ia64_increment_ip(regs);
345                         }
346                         siginfo.si_signo = SIGFPE;
347                         siginfo.si_errno = 0;
348                         siginfo.si_code = __SI_FAULT;   /* default code */
349                         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
350                         if (isr & 0x11) {
351                                 siginfo.si_code = FPE_FLTINV;
352                         } else if (isr & 0x22) {
353                                 /* denormal operand gets the same si_code as underflow 
354                                 * see arch/i386/kernel/traps.c:math_error()  */
355                                 siginfo.si_code = FPE_FLTUND;
356                         } else if (isr & 0x44) {
357                                 siginfo.si_code = FPE_FLTDIV;
358                         }
359                         siginfo.si_isr = isr;
360                         siginfo.si_flags = __ISR_VALID;
361                         siginfo.si_imm = 0;
362                         force_sig_info(SIGFPE, &siginfo, current);
363                 }
364         } else {
365                 if (exception == -1) {
366                         printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
367                         return -1;
368                 } else if (exception != 0) {
369                         /* raise exception */
370                         siginfo.si_signo = SIGFPE;
371                         siginfo.si_errno = 0;
372                         siginfo.si_code = __SI_FAULT;   /* default code */
373                         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
374                         if (isr & 0x880) {
375                                 siginfo.si_code = FPE_FLTOVF;
376                         } else if (isr & 0x1100) {
377                                 siginfo.si_code = FPE_FLTUND;
378                         } else if (isr & 0x2200) {
379                                 siginfo.si_code = FPE_FLTRES;
380                         }
381                         siginfo.si_isr = isr;
382                         siginfo.si_flags = __ISR_VALID;
383                         siginfo.si_imm = 0;
384                         force_sig_info(SIGFPE, &siginfo, current);
385                 }
386         }
387         return 0;
388 }
389
390 struct illegal_op_return {
391         unsigned long fkt, arg1, arg2, arg3;
392 };
393
394 struct illegal_op_return
395 ia64_illegal_op_fault (unsigned long ec, long arg1, long arg2, long arg3,
396                        long arg4, long arg5, long arg6, long arg7,
397                        struct pt_regs regs)
398 {
399         struct illegal_op_return rv;
400         struct siginfo si;
401         char buf[128];
402
403 #ifdef CONFIG_IA64_BRL_EMU
404         {
405                 extern struct illegal_op_return ia64_emulate_brl (struct pt_regs *, unsigned long);
406
407                 rv = ia64_emulate_brl(&regs, ec);
408                 if (rv.fkt != (unsigned long) -1)
409                         return rv;
410         }
411 #endif
412
413         sprintf(buf, "IA-64 Illegal operation fault");
414         rv.fkt = 0;
415         if (die_if_kernel(buf, &regs, 0))
416                 return rv;
417
418         memset(&si, 0, sizeof(si));
419         si.si_signo = SIGILL;
420         si.si_code = ILL_ILLOPC;
421         si.si_addr = (void __user *) (regs.cr_iip + ia64_psr(&regs)->ri);
422         force_sig_info(SIGILL, &si, current);
423         return rv;
424 }
425
426 void __kprobes
427 ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
428             unsigned long iim, unsigned long itir, long arg5, long arg6,
429             long arg7, struct pt_regs regs)
430 {
431         unsigned long code, error = isr, iip;
432         struct siginfo siginfo;
433         char buf[128];
434         int result, sig;
435         static const char *reason[] = {
436                 "IA-64 Illegal Operation fault",
437                 "IA-64 Privileged Operation fault",
438                 "IA-64 Privileged Register fault",
439                 "IA-64 Reserved Register/Field fault",
440                 "Disabled Instruction Set Transition fault",
441                 "Unknown fault 5", "Unknown fault 6", "Unknown fault 7", "Illegal Hazard fault",
442                 "Unknown fault 9", "Unknown fault 10", "Unknown fault 11", "Unknown fault 12",
443                 "Unknown fault 13", "Unknown fault 14", "Unknown fault 15"
444         };
445
446         if ((isr & IA64_ISR_NA) && ((isr & IA64_ISR_CODE_MASK) == IA64_ISR_CODE_LFETCH)) {
447                 /*
448                  * This fault was due to lfetch.fault, set "ed" bit in the psr to cancel
449                  * the lfetch.
450                  */
451                 ia64_psr(&regs)->ed = 1;
452                 return;
453         }
454
455         iip = regs.cr_iip + ia64_psr(&regs)->ri;
456
457         switch (vector) {
458               case 24: /* General Exception */
459                 code = (isr >> 4) & 0xf;
460                 sprintf(buf, "General Exception: %s%s", reason[code],
461                         (code == 3) ? ((isr & (1UL << 37))
462                                        ? " (RSE access)" : " (data access)") : "");
463                 if (code == 8) {
464 # ifdef CONFIG_IA64_PRINT_HAZARDS
465                         printk("%s[%d]: possible hazard @ ip=%016lx (pr = %016lx)\n",
466                                current->comm, task_pid_nr(current),
467                                regs.cr_iip + ia64_psr(&regs)->ri, regs.pr);
468 # endif
469                         return;
470                 }
471                 break;
472
473               case 25: /* Disabled FP-Register */
474                 if (isr & 2) {
475                         disabled_fph_fault(&regs);
476                         return;
477                 }
478                 sprintf(buf, "Disabled FPL fault---not supposed to happen!");
479                 break;
480
481               case 26: /* NaT Consumption */
482                 if (user_mode(&regs)) {
483                         void __user *addr;
484
485                         if (((isr >> 4) & 0xf) == 2) {
486                                 /* NaT page consumption */
487                                 sig = SIGSEGV;
488                                 code = SEGV_ACCERR;
489                                 addr = (void __user *) ifa;
490                         } else {
491                                 /* register NaT consumption */
492                                 sig = SIGILL;
493                                 code = ILL_ILLOPN;
494                                 addr = (void __user *) (regs.cr_iip
495                                                         + ia64_psr(&regs)->ri);
496                         }
497                         siginfo.si_signo = sig;
498                         siginfo.si_code = code;
499                         siginfo.si_errno = 0;
500                         siginfo.si_addr = addr;
501                         siginfo.si_imm = vector;
502                         siginfo.si_flags = __ISR_VALID;
503                         siginfo.si_isr = isr;
504                         force_sig_info(sig, &siginfo, current);
505                         return;
506                 } else if (ia64_done_with_exception(&regs))
507                         return;
508                 sprintf(buf, "NaT consumption");
509                 break;
510
511               case 31: /* Unsupported Data Reference */
512                 if (user_mode(&regs)) {
513                         siginfo.si_signo = SIGILL;
514                         siginfo.si_code = ILL_ILLOPN;
515                         siginfo.si_errno = 0;
516                         siginfo.si_addr = (void __user *) iip;
517                         siginfo.si_imm = vector;
518                         siginfo.si_flags = __ISR_VALID;
519                         siginfo.si_isr = isr;
520                         force_sig_info(SIGILL, &siginfo, current);
521                         return;
522                 }
523                 sprintf(buf, "Unsupported data reference");
524                 break;
525
526               case 29: /* Debug */
527               case 35: /* Taken Branch Trap */
528               case 36: /* Single Step Trap */
529                 if (fsys_mode(current, &regs)) {
530                         extern char __kernel_syscall_via_break[];
531                         /*
532                          * Got a trap in fsys-mode: Taken Branch Trap
533                          * and Single Step trap need special handling;
534                          * Debug trap is ignored (we disable it here
535                          * and re-enable it in the lower-privilege trap).
536                          */
537                         if (unlikely(vector == 29)) {
538                                 set_thread_flag(TIF_DB_DISABLED);
539                                 ia64_psr(&regs)->db = 0;
540                                 ia64_psr(&regs)->lp = 1;
541                                 return;
542                         }
543                         /* re-do the system call via break 0x100000: */
544                         regs.cr_iip = (unsigned long) __kernel_syscall_via_break;
545                         ia64_psr(&regs)->ri = 0;
546                         ia64_psr(&regs)->cpl = 3;
547                         return;
548                 }
549                 switch (vector) {
550                       case 29:
551                         siginfo.si_code = TRAP_HWBKPT;
552 #ifdef CONFIG_ITANIUM
553                         /*
554                          * Erratum 10 (IFA may contain incorrect address) now has
555                          * "NoFix" status.  There are no plans for fixing this.
556                          */
557                         if (ia64_psr(&regs)->is == 0)
558                           ifa = regs.cr_iip;
559 #endif
560                         break;
561                       case 35: siginfo.si_code = TRAP_BRANCH; ifa = 0; break;
562                       case 36: siginfo.si_code = TRAP_TRACE; ifa = 0; break;
563                 }
564                 if (notify_die(DIE_FAULT, "ia64_fault", &regs, vector, siginfo.si_code, SIGTRAP)
565                                 == NOTIFY_STOP)
566                         return;
567                 siginfo.si_signo = SIGTRAP;
568                 siginfo.si_errno = 0;
569                 siginfo.si_addr  = (void __user *) ifa;
570                 siginfo.si_imm   = 0;
571                 siginfo.si_flags = __ISR_VALID;
572                 siginfo.si_isr   = isr;
573                 force_sig_info(SIGTRAP, &siginfo, current);
574                 return;
575
576               case 32: /* fp fault */
577               case 33: /* fp trap */
578                 result = handle_fpu_swa((vector == 32) ? 1 : 0, &regs, isr);
579                 if ((result < 0) || (current->thread.flags & IA64_THREAD_FPEMU_SIGFPE)) {
580                         siginfo.si_signo = SIGFPE;
581                         siginfo.si_errno = 0;
582                         siginfo.si_code = FPE_FLTINV;
583                         siginfo.si_addr = (void __user *) iip;
584                         siginfo.si_flags = __ISR_VALID;
585                         siginfo.si_isr = isr;
586                         siginfo.si_imm = 0;
587                         force_sig_info(SIGFPE, &siginfo, current);
588                 }
589                 return;
590
591               case 34:
592                 if (isr & 0x2) {
593                         /* Lower-Privilege Transfer Trap */
594
595                         /* If we disabled debug traps during an fsyscall,
596                          * re-enable them here.
597                          */
598                         if (test_thread_flag(TIF_DB_DISABLED)) {
599                                 clear_thread_flag(TIF_DB_DISABLED);
600                                 ia64_psr(&regs)->db = 1;
601                         }
602
603                         /*
604                          * Just clear PSR.lp and then return immediately:
605                          * all the interesting work (e.g., signal delivery)
606                          * is done in the kernel exit path.
607                          */
608                         ia64_psr(&regs)->lp = 0;
609                         return;
610                 } else {
611                         /* Unimplemented Instr. Address Trap */
612                         if (user_mode(&regs)) {
613                                 siginfo.si_signo = SIGILL;
614                                 siginfo.si_code = ILL_BADIADDR;
615                                 siginfo.si_errno = 0;
616                                 siginfo.si_flags = 0;
617                                 siginfo.si_isr = 0;
618                                 siginfo.si_imm = 0;
619                                 siginfo.si_addr = (void __user *) iip;
620                                 force_sig_info(SIGILL, &siginfo, current);
621                                 return;
622                         }
623                         sprintf(buf, "Unimplemented Instruction Address fault");
624                 }
625                 break;
626
627               case 45:
628                 printk(KERN_ERR "Unexpected IA-32 exception (Trap 45)\n");
629                 printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx\n",
630                        iip, ifa, isr);
631                 force_sig(SIGSEGV, current);
632                 break;
633
634               case 46:
635                 printk(KERN_ERR "Unexpected IA-32 intercept trap (Trap 46)\n");
636                 printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx, iim - 0x%lx\n",
637                        iip, ifa, isr, iim);
638                 force_sig(SIGSEGV, current);
639                 return;
640
641               case 47:
642                 sprintf(buf, "IA-32 Interruption Fault (int 0x%lx)", isr >> 16);
643                 break;
644
645               default:
646                 sprintf(buf, "Fault %lu", vector);
647                 break;
648         }
649         if (!die_if_kernel(buf, &regs, error))
650                 force_sig(SIGILL, current);
651 }