arch/ia64/kernel/traps.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Architecture-specific trap handling.
   4  *
   5  * Copyright (C) 1998-2003 Hewlett-Packard Co
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>
   7  *
   8  * 05/12/00 grao <goutham.rao@intel.com> : added isr in siginfo for SIGFPE
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/sched/signal.h>
  14 #include <linux/sched/debug.h>
  15 #include <linux/tty.h>
  16 #include <linux/vt_kern.h>              /* For unblank_screen() */
  17 #include <linux/export.h>
  18 #include <linux/extable.h>
  19 #include <linux/hardirq.h>
  20 #include <linux/kprobes.h>
  21 #include <linux/delay.h>                /* for ssleep() */
  22 #include <linux/kdebug.h>
  23 #include <linux/uaccess.h>
  24
  25 #include <asm/fpswa.h>
  26 #include <asm/intrinsics.h>
  27 #include <asm/processor.h>
  28 #include <asm/exception.h>
  29 #include <asm/setup.h>
  30
  31 fpswa_interface_t *fpswa_interface;
  32 EXPORT_SYMBOL(fpswa_interface);
  33
  34 void __init
  35 trap_init (void)
  36 {
  37         if (ia64_boot_param->fpswa)
  38                 /* FPSWA fixup: make the interface pointer a kernel virtual address: */
  39                 fpswa_interface = __va(ia64_boot_param->fpswa);
  40 }
  41
  42 int
  43 die (const char *str, struct pt_regs *regs, long err)
  44 {
  45         static struct {
  46                 spinlock_t lock;
  47                 u32 lock_owner;
  48                 int lock_owner_depth;
  49         } die = {
  50                 .lock = __SPIN_LOCK_UNLOCKED(die.lock),
  51                 .lock_owner = -1,
  52                 .lock_owner_depth = 0
  53         };
  54         static int die_counter;
  55         int cpu = get_cpu();
  56
  57         if (die.lock_owner != cpu) {
  58                 console_verbose();
  59                 spin_lock_irq(&die.lock);
  60                 die.lock_owner = cpu;
  61                 die.lock_owner_depth = 0;
  62                 bust_spinlocks(1);
  63         }
  64         put_cpu();
  65
  66         if (++die.lock_owner_depth < 3) {
  67                 printk("%s[%d]: %s %ld [%d]\n",
  68                 current->comm, task_pid_nr(current), str, err, ++die_counter);
  69                 if (notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV)
  70                     != NOTIFY_STOP)
  71                         show_regs(regs);
  72                 else
  73                         regs = NULL;
  74         } else
  75                 printk(KERN_ERR "Recursive die() failure, output suppressed\n");
  76
  77         bust_spinlocks(0);
  78         die.lock_owner = -1;
  79         add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
  80         spin_unlock_irq(&die.lock);
  81
  82         if (!regs)
  83                 return 1;
  84
  85         if (panic_on_oops)
  86                 panic("Fatal exception");
  87
  88         make_task_dead(SIGSEGV);
  89         return 0;
  90 }
  91
  92 int
  93 die_if_kernel (char *str, struct pt_regs *regs, long err)
  94 {
  95         if (!user_mode(regs))
  96                 return die(str, regs, err);
  97         return 0;
  98 }
  99
 100 void
 101 __kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
 102 {
 103         siginfo_t siginfo;
 104         int sig, code;
 105
 106         /* SIGILL, SIGFPE, SIGSEGV, and SIGBUS want these field initialized: */
 107         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
 108         siginfo.si_imm = break_num;
 109         siginfo.si_flags = 0;           /* clear __ISR_VALID */
 110         siginfo.si_isr = 0;
 111
 112         switch (break_num) {
 113               case 0: /* unknown error (used by GCC for __builtin_abort()) */
 114                 if (notify_die(DIE_BREAK, "break 0", regs, break_num, TRAP_BRKPT, SIGTRAP)
 115                                 == NOTIFY_STOP)
 116                         return;
 117                 if (die_if_kernel("bugcheck!", regs, break_num))
 118                         return;
 119                 sig = SIGILL; code = ILL_ILLOPC;
 120                 break;
 121
 122               case 1: /* integer divide by zero */
 123                 sig = SIGFPE; code = FPE_INTDIV;
 124                 break;
 125
 126               case 2: /* integer overflow */
 127                 sig = SIGFPE; code = FPE_INTOVF;
 128                 break;
 129
 130               case 3: /* range check/bounds check */
 131                 sig = SIGFPE; code = FPE_FLTSUB;
 132                 break;
 133
 134               case 4: /* null pointer dereference */
 135                 sig = SIGSEGV; code = SEGV_MAPERR;
 136                 break;
 137
 138               case 5: /* misaligned data */
 139                 sig = SIGSEGV; code = BUS_ADRALN;
 140                 break;
 141
 142               case 6: /* decimal overflow */
 143                 sig = SIGFPE; code = __FPE_DECOVF;
 144                 break;
 145
 146               case 7: /* decimal divide by zero */
 147                 sig = SIGFPE; code = __FPE_DECDIV;
 148                 break;
 149
 150               case 8: /* packed decimal error */
 151                 sig = SIGFPE; code = __FPE_DECERR;
 152                 break;
 153
 154               case 9: /* invalid ASCII digit */
 155                 sig = SIGFPE; code = __FPE_INVASC;
 156                 break;
 157
 158               case 10: /* invalid decimal digit */
 159                 sig = SIGFPE; code = __FPE_INVDEC;
 160                 break;
 161
 162               case 11: /* paragraph stack overflow */
 163                 sig = SIGSEGV; code = __SEGV_PSTKOVF;
 164                 break;
 165
 166               case 0x3f000 ... 0x3ffff: /* bundle-update in progress */
 167                 sig = SIGILL; code = __ILL_BNDMOD;
 168                 break;
 169
 170               default:
 171                 if ((break_num < 0x40000 || break_num > 0x100000)
 172                     && die_if_kernel("Bad break", regs, break_num))
 173                         return;
 174
 175                 if (break_num < 0x80000) {
 176                         sig = SIGILL; code = __ILL_BREAK;
 177                 } else {
 178                         if (notify_die(DIE_BREAK, "bad break", regs, break_num, TRAP_BRKPT, SIGTRAP)
 179                                         == NOTIFY_STOP)
 180                                 return;
 181                         sig = SIGTRAP; code = TRAP_BRKPT;
 182                 }
 183         }
 184         siginfo.si_signo = sig;
 185         siginfo.si_errno = 0;
 186         siginfo.si_code = code;
 187         force_sig_info(sig, &siginfo, current);
 188 }
 189
 190 /*
 191  * disabled_fph_fault() is called when a user-level process attempts to access f32..f127
 192  * and it doesn't own the fp-high register partition.  When this happens, we save the
 193  * current fph partition in the task_struct of the fpu-owner (if necessary) and then load
 194  * the fp-high partition of the current task (if necessary).  Note that the kernel has
 195  * access to fph by the time we get here, as the IVT's "Disabled FP-Register" handler takes
 196  * care of clearing psr.dfh.
 197  */
 198 static inline void
 199 disabled_fph_fault (struct pt_regs *regs)
 200 {
 201         struct ia64_psr *psr = ia64_psr(regs);
 202
 203         /* first, grant user-level access to fph partition: */
 204         psr->dfh = 0;
 205
 206         /*
 207          * Make sure that no other task gets in on this processor
 208          * while we're claiming the FPU
 209          */
 210         preempt_disable();
 211 #ifndef CONFIG_SMP
 212         {
 213                 struct task_struct *fpu_owner
 214                         = (struct task_struct *)ia64_get_kr(IA64_KR_FPU_OWNER);
 215
 216                 if (ia64_is_local_fpu_owner(current)) {
 217                         preempt_enable_no_resched();
 218                         return;
 219                 }
 220
 221                 if (fpu_owner)
 222                         ia64_flush_fph(fpu_owner);
 223         }
 224 #endif /* !CONFIG_SMP */
 225         ia64_set_local_fpu_owner(current);
 226         if ((current->thread.flags & IA64_THREAD_FPH_VALID) != 0) {
 227                 __ia64_load_fpu(current->thread.fph);
 228                 psr->mfh = 0;
 229         } else {
 230                 __ia64_init_fpu();
 231                 /*
 232                  * Set mfh because the state in thread.fph does not match the state in
 233                  * the fph partition.
 234                  */
 235                 psr->mfh = 1;
 236         }
 237         preempt_enable_no_resched();
 238 }
 239
 240 static inline int
 241 fp_emulate (int fp_fault, void *bundle, long *ipsr, long *fpsr, long *isr, long *pr, long *ifs,
 242             struct pt_regs *regs)
 243 {
 244         fp_state_t fp_state;
 245         fpswa_ret_t ret;
 246
 247         if (!fpswa_interface)
 248                 return -1;
 249
 250         memset(&fp_state, 0, sizeof(fp_state_t));
 251
 252         /*
 253          * compute fp_state.  only FP registers f6 - f11 are used by the
 254          * kernel, so set those bits in the mask and set the low volatile
 255          * pointer to point to these registers.
 256          */
 257         fp_state.bitmask_low64 = 0xfc0;  /* bit6..bit11 */
 258
 259         fp_state.fp_state_low_volatile = (fp_state_low_volatile_t *) &regs->f6;
 260         /*
 261          * unsigned long (*EFI_FPSWA) (
 262          *      unsigned long    trap_type,
 263          *      void             *Bundle,
 264          *      unsigned long    *pipsr,
 265          *      unsigned long    *pfsr,
 266          *      unsigned long    *pisr,
 267          *      unsigned long    *ppreds,
 268          *      unsigned long    *pifs,
 269          *      void             *fp_state);
 270          */
 271         ret = (*fpswa_interface->fpswa)((unsigned long) fp_fault, bundle,
 272                                         (unsigned long *) ipsr, (unsigned long *) fpsr,
 273                                         (unsigned long *) isr, (unsigned long *) pr,
 274                                         (unsigned long *) ifs, &fp_state);
 275
 276         return ret.status;
 277 }
 278
 279 struct fpu_swa_msg {
 280         unsigned long count;
 281         unsigned long time;
 282 };
 283 static DEFINE_PER_CPU(struct fpu_swa_msg, cpulast);
 284 DECLARE_PER_CPU(struct fpu_swa_msg, cpulast);
 285 static struct fpu_swa_msg last __cacheline_aligned;
 286
 287
 288 /*
 289  * Handle floating-point assist faults and traps.
 290  */
 291 static int
 292 handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr)
 293 {
 294         long exception, bundle[2];
 295         unsigned long fault_ip;
 296         struct siginfo siginfo;
 297
 298         fault_ip = regs->cr_iip;
 299         if (!fp_fault && (ia64_psr(regs)->ri == 0))
 300                 fault_ip -= 16;
 301         if (copy_from_user(bundle, (void __user *) fault_ip, sizeof(bundle)))
 302                 return -1;
 303
 304         if (!(current->thread.flags & IA64_THREAD_FPEMU_NOPRINT))  {
 305                 unsigned long count, current_jiffies = jiffies;
 306                 struct fpu_swa_msg *cp = this_cpu_ptr(&cpulast);
 307
 308                 if (unlikely(current_jiffies > cp->time))
 309                         cp->count = 0;
 310                 if (unlikely(cp->count < 5)) {
 311                         cp->count++;
 312                         cp->time = current_jiffies + 5 * HZ;
 313
 314                         /* minimize races by grabbing a copy of count BEFORE checking last.time. */
 315                         count = last.count;
 316                         barrier();
 317
 318                         /*
 319                          * Lower 4 bits are used as a count. Upper bits are a sequence
 320                          * number that is updated when count is reset. The cmpxchg will
 321                          * fail is seqno has changed. This minimizes mutiple cpus
 322                          * resetting the count.
 323                          */
 324                         if (current_jiffies > last.time)
 325                                 (void) cmpxchg_acq(&last.count, count, 16 + (count & ~15));
 326
 327                         /* used fetchadd to atomically update the count */
 328                         if ((last.count & 15) < 5 && (ia64_fetchadd(1, &last.count, acq) & 15) < 5) {
 329                                 last.time = current_jiffies + 5 * HZ;
 330                                 printk(KERN_WARNING
 331                                         "%s(%d): floating-point assist fault at ip %016lx, isr %016lx\n",
 332                                         current->comm, task_pid_nr(current), regs->cr_iip + ia64_psr(regs)->ri, isr);
 333                         }
 334                 }
 335         }
 336
 337         exception = fp_emulate(fp_fault, bundle, &regs->cr_ipsr, &regs->ar_fpsr, &isr, &regs->pr,
 338                                &regs->cr_ifs, regs);
 339         if (fp_fault) {
 340                 if (exception == 0) {
 341                         /* emulation was successful */
 342                         ia64_increment_ip(regs);
 343                 } else if (exception == -1) {
 344                         printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
 345                         return -1;
 346                 } else {
 347                         /* is next instruction a trap? */
 348                         if (exception & 2) {
 349                                 ia64_increment_ip(regs);
 350                         }
 351                         siginfo.si_signo = SIGFPE;
 352                         siginfo.si_errno = 0;
 353                         siginfo.si_code = FPE_FIXME;    /* default code */
 354                         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
 355                         if (isr & 0x11) {
 356                                 siginfo.si_code = FPE_FLTINV;
 357                         } else if (isr & 0x22) {
 358                                 /* denormal operand gets the same si_code as underflow
 359                                 * see arch/i386/kernel/traps.c:math_error()  */
 360                                 siginfo.si_code = FPE_FLTUND;
 361                         } else if (isr & 0x44) {
 362                                 siginfo.si_code = FPE_FLTDIV;
 363                         }
 364                         siginfo.si_isr = isr;
 365                         siginfo.si_flags = __ISR_VALID;
 366                         siginfo.si_imm = 0;
 367                         force_sig_info(SIGFPE, &siginfo, current);
 368                 }
 369         } else {
 370                 if (exception == -1) {
 371                         printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
 372                         return -1;
 373                 } else if (exception != 0) {
 374                         /* raise exception */
 375                         siginfo.si_signo = SIGFPE;
 376                         siginfo.si_errno = 0;
 377                         siginfo.si_code = FPE_FIXME;    /* default code */
 378                         siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
 379                         if (isr & 0x880) {
 380                                 siginfo.si_code = FPE_FLTOVF;
 381                         } else if (isr & 0x1100) {
 382                                 siginfo.si_code = FPE_FLTUND;
 383                         } else if (isr & 0x2200) {
 384                                 siginfo.si_code = FPE_FLTRES;
 385                         }
 386                         siginfo.si_isr = isr;
 387                         siginfo.si_flags = __ISR_VALID;
 388                         siginfo.si_imm = 0;
 389                         force_sig_info(SIGFPE, &siginfo, current);
 390                 }
 391         }
 392         return 0;
 393 }
 394
 395 struct illegal_op_return {
 396         unsigned long fkt, arg1, arg2, arg3;
 397 };
 398
 399 struct illegal_op_return
 400 ia64_illegal_op_fault (unsigned long ec, long arg1, long arg2, long arg3,
 401                        long arg4, long arg5, long arg6, long arg7,
 402                        struct pt_regs regs)
 403 {
 404         struct illegal_op_return rv;
 405         struct siginfo si;
 406         char buf[128];
 407
 408 #ifdef CONFIG_IA64_BRL_EMU
 409         {
 410                 extern struct illegal_op_return ia64_emulate_brl (struct pt_regs *, unsigned long);
 411
 412                 rv = ia64_emulate_brl(&regs, ec);
 413                 if (rv.fkt != (unsigned long) -1)
 414                         return rv;
 415         }
 416 #endif
 417
 418         sprintf(buf, "IA-64 Illegal operation fault");
 419         rv.fkt = 0;
 420         if (die_if_kernel(buf, &regs, 0))
 421                 return rv;
 422
 423         memset(&si, 0, sizeof(si));
 424         si.si_signo = SIGILL;
 425         si.si_code = ILL_ILLOPC;
 426         si.si_addr = (void __user *) (regs.cr_iip + ia64_psr(&regs)->ri);
 427         force_sig_info(SIGILL, &si, current);
 428         return rv;
 429 }
 430
 431 void __kprobes
 432 ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
 433             unsigned long iim, unsigned long itir, long arg5, long arg6,
 434             long arg7, struct pt_regs regs)
 435 {
 436         unsigned long code, error = isr, iip;
 437         struct siginfo siginfo;
 438         char buf[128];
 439         int result, sig;
 440         static const char *reason[] = {
 441                 "IA-64 Illegal Operation fault",
 442                 "IA-64 Privileged Operation fault",
 443                 "IA-64 Privileged Register fault",
 444                 "IA-64 Reserved Register/Field fault",
 445                 "Disabled Instruction Set Transition fault",
 446                 "Unknown fault 5", "Unknown fault 6", "Unknown fault 7", "Illegal Hazard fault",
 447                 "Unknown fault 9", "Unknown fault 10", "Unknown fault 11", "Unknown fault 12",
 448                 "Unknown fault 13", "Unknown fault 14", "Unknown fault 15"
 449         };
 450
 451         if ((isr & IA64_ISR_NA) && ((isr & IA64_ISR_CODE_MASK) == IA64_ISR_CODE_LFETCH)) {
 452                 /*
 453                  * This fault was due to lfetch.fault, set "ed" bit in the psr to cancel
 454                  * the lfetch.
 455                  */
 456                 ia64_psr(&regs)->ed = 1;
 457                 return;
 458         }
 459
 460         iip = regs.cr_iip + ia64_psr(&regs)->ri;
 461
 462         switch (vector) {
 463               case 24: /* General Exception */
 464                 code = (isr >> 4) & 0xf;
 465                 sprintf(buf, "General Exception: %s%s", reason[code],
 466                         (code == 3) ? ((isr & (1UL << 37))
 467                                        ? " (RSE access)" : " (data access)") : "");
 468                 if (code == 8) {
 469 # ifdef CONFIG_IA64_PRINT_HAZARDS
 470                         printk("%s[%d]: possible hazard @ ip=%016lx (pr = %016lx)\n",
 471                                current->comm, task_pid_nr(current),
 472                                regs.cr_iip + ia64_psr(&regs)->ri, regs.pr);
 473 # endif
 474                         return;
 475                 }
 476                 break;
 477
 478               case 25: /* Disabled FP-Register */
 479                 if (isr & 2) {
 480                         disabled_fph_fault(&regs);
 481                         return;
 482                 }
 483                 sprintf(buf, "Disabled FPL fault---not supposed to happen!");
 484                 break;
 485
 486               case 26: /* NaT Consumption */
 487                 if (user_mode(&regs)) {
 488                         void __user *addr;
 489
 490                         if (((isr >> 4) & 0xf) == 2) {
 491                                 /* NaT page consumption */
 492                                 sig = SIGSEGV;
 493                                 code = SEGV_ACCERR;
 494                                 addr = (void __user *) ifa;
 495                         } else {
 496                                 /* register NaT consumption */
 497                                 sig = SIGILL;
 498                                 code = ILL_ILLOPN;
 499                                 addr = (void __user *) (regs.cr_iip
 500                                                         + ia64_psr(&regs)->ri);
 501                         }
 502                         siginfo.si_signo = sig;
 503                         siginfo.si_code = code;
 504                         siginfo.si_errno = 0;
 505                         siginfo.si_addr = addr;
 506                         siginfo.si_imm = vector;
 507                         siginfo.si_flags = __ISR_VALID;
 508                         siginfo.si_isr = isr;
 509                         force_sig_info(sig, &siginfo, current);
 510                         return;
 511                 } else if (ia64_done_with_exception(&regs))
 512                         return;
 513                 sprintf(buf, "NaT consumption");
 514                 break;
 515
 516               case 31: /* Unsupported Data Reference */
 517                 if (user_mode(&regs)) {
 518                         siginfo.si_signo = SIGILL;
 519                         siginfo.si_code = ILL_ILLOPN;
 520                         siginfo.si_errno = 0;
 521                         siginfo.si_addr = (void __user *) iip;
 522                         siginfo.si_imm = vector;
 523                         siginfo.si_flags = __ISR_VALID;
 524                         siginfo.si_isr = isr;
 525                         force_sig_info(SIGILL, &siginfo, current);
 526                         return;
 527                 }
 528                 sprintf(buf, "Unsupported data reference");
 529                 break;
 530
 531               case 29: /* Debug */
 532               case 35: /* Taken Branch Trap */
 533               case 36: /* Single Step Trap */
 534                 if (fsys_mode(current, &regs)) {
 535                         extern char __kernel_syscall_via_break[];
 536                         /*
 537                          * Got a trap in fsys-mode: Taken Branch Trap
 538                          * and Single Step trap need special handling;
 539                          * Debug trap is ignored (we disable it here
 540                          * and re-enable it in the lower-privilege trap).
 541                          */
 542                         if (unlikely(vector == 29)) {
 543                                 set_thread_flag(TIF_DB_DISABLED);
 544                                 ia64_psr(&regs)->db = 0;
 545                                 ia64_psr(&regs)->lp = 1;
 546                                 return;
 547                         }
 548                         /* re-do the system call via break 0x100000: */
 549                         regs.cr_iip = (unsigned long) __kernel_syscall_via_break;
 550                         ia64_psr(&regs)->ri = 0;
 551                         ia64_psr(&regs)->cpl = 3;
 552                         return;
 553                 }
 554                 switch (vector) {
 555                       default:
 556                       case 29:
 557                         siginfo.si_code = TRAP_HWBKPT;
 558 #ifdef CONFIG_ITANIUM
 559                         /*
 560                          * Erratum 10 (IFA may contain incorrect address) now has
 561                          * "NoFix" status.  There are no plans for fixing this.
 562                          */
 563                         if (ia64_psr(&regs)->is == 0)
 564                           ifa = regs.cr_iip;
 565 #endif
 566                         break;
 567                       case 35: siginfo.si_code = TRAP_BRANCH; ifa = 0; break;
 568                       case 36: siginfo.si_code = TRAP_TRACE; ifa = 0; break;
 569                 }
 570                 if (notify_die(DIE_FAULT, "ia64_fault", &regs, vector, siginfo.si_code, SIGTRAP)
 571                                 == NOTIFY_STOP)
 572                         return;
 573                 siginfo.si_signo = SIGTRAP;
 574                 siginfo.si_errno = 0;
 575                 siginfo.si_addr  = (void __user *) ifa;
 576                 siginfo.si_imm   = 0;
 577                 siginfo.si_flags = __ISR_VALID;
 578                 siginfo.si_isr   = isr;
 579                 force_sig_info(SIGTRAP, &siginfo, current);
 580                 return;
 581
 582               case 32: /* fp fault */
 583               case 33: /* fp trap */
 584                 result = handle_fpu_swa((vector == 32) ? 1 : 0, &regs, isr);
 585                 if ((result < 0) || (current->thread.flags & IA64_THREAD_FPEMU_SIGFPE)) {
 586                         siginfo.si_signo = SIGFPE;
 587                         siginfo.si_errno = 0;
 588                         siginfo.si_code = FPE_FLTINV;
 589                         siginfo.si_addr = (void __user *) iip;
 590                         siginfo.si_flags = __ISR_VALID;
 591                         siginfo.si_isr = isr;
 592                         siginfo.si_imm = 0;
 593                         force_sig_info(SIGFPE, &siginfo, current);
 594                 }
 595                 return;
 596
 597               case 34:
 598                 if (isr & 0x2) {
 599                         /* Lower-Privilege Transfer Trap */
 600
 601                         /* If we disabled debug traps during an fsyscall,
 602                          * re-enable them here.
 603                          */
 604                         if (test_thread_flag(TIF_DB_DISABLED)) {
 605                                 clear_thread_flag(TIF_DB_DISABLED);
 606                                 ia64_psr(&regs)->db = 1;
 607                         }
 608
 609                         /*
 610                          * Just clear PSR.lp and then return immediately:
 611                          * all the interesting work (e.g., signal delivery)
 612                          * is done in the kernel exit path.
 613                          */
 614                         ia64_psr(&regs)->lp = 0;
 615                         return;
 616                 } else {
 617                         /* Unimplemented Instr. Address Trap */
 618                         if (user_mode(&regs)) {
 619                                 siginfo.si_signo = SIGILL;
 620                                 siginfo.si_code = ILL_BADIADDR;
 621                                 siginfo.si_errno = 0;
 622                                 siginfo.si_flags = 0;
 623                                 siginfo.si_isr = 0;
 624                                 siginfo.si_imm = 0;
 625                                 siginfo.si_addr = (void __user *) iip;
 626                                 force_sig_info(SIGILL, &siginfo, current);
 627                                 return;
 628                         }
 629                         sprintf(buf, "Unimplemented Instruction Address fault");
 630                 }
 631                 break;
 632
 633               case 45:
 634                 printk(KERN_ERR "Unexpected IA-32 exception (Trap 45)\n");
 635                 printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx\n",
 636                        iip, ifa, isr);
 637                 force_sig(SIGSEGV, current);
 638                 return;
 639
 640               case 46:
 641                 printk(KERN_ERR "Unexpected IA-32 intercept trap (Trap 46)\n");
 642                 printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx, iim - 0x%lx\n",
 643                        iip, ifa, isr, iim);
 644                 force_sig(SIGSEGV, current);
 645                 return;
 646
 647               case 47:
 648                 sprintf(buf, "IA-32 Interruption Fault (int 0x%lx)", isr >> 16);
 649                 break;
 650
 651               default:
 652                 sprintf(buf, "Fault %lu", vector);
 653                 break;
 654         }
 655         if (!die_if_kernel(buf, &regs, error))
 656                 force_sig(SIGILL, current);
 657 }