linux/arch/ia64/kernel/traps.c
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   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#include <asm/setup.h>
  26
  27fpswa_interface_t *fpswa_interface;
  28EXPORT_SYMBOL(fpswa_interface);
  29
  30void __init
  31trap_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
  38int
  39die (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, task_pid_nr(current), str, err, ++die_counter);
  65                if (notify_die(DIE_OOPS, str, regs, err, 255, SIGSEGV)
  66                    != NOTIFY_STOP)
  67                        show_regs(regs);
  68                else
  69                        regs = NULL;
  70        } else
  71                printk(KERN_ERR "Recursive die() failure, output suppressed\n");
  72
  73        bust_spinlocks(0);
  74        die.lock_owner = -1;
  75        add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
  76        spin_unlock_irq(&die.lock);
  77
  78        if (!regs)
  79                return 1;
  80
  81        if (panic_on_oops)
  82                panic("Fatal exception");
  83
  84        do_exit(SIGSEGV);
  85        return 0;
  86}
  87
  88int
  89die_if_kernel (char *str, struct pt_regs *regs, long err)
  90{
  91        if (!user_mode(regs))
  92                return die(str, regs, err);
  93        return 0;
  94}
  95
  96void
  97__kprobes ia64_bad_break (unsigned long break_num, struct pt_regs *regs)
  98{
  99        siginfo_t siginfo;
 100        int sig, code;
 101
 102        /* SIGILL, SIGFPE, SIGSEGV, and SIGBUS want these field initialized: */
 103        siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
 104        siginfo.si_imm = break_num;
 105        siginfo.si_flags = 0;           /* clear __ISR_VALID */
 106        siginfo.si_isr = 0;
 107
 108        switch (break_num) {
 109              case 0: /* unknown error (used by GCC for __builtin_abort()) */
 110                if (notify_die(DIE_BREAK, "break 0", regs, break_num, TRAP_BRKPT, SIGTRAP)
 111                                == NOTIFY_STOP)
 112                        return;
 113                if (die_if_kernel("bugcheck!", regs, break_num))
 114                        return;
 115                sig = SIGILL; code = ILL_ILLOPC;
 116                break;
 117
 118              case 1: /* integer divide by zero */
 119                sig = SIGFPE; code = FPE_INTDIV;
 120                break;
 121
 122              case 2: /* integer overflow */
 123                sig = SIGFPE; code = FPE_INTOVF;
 124                break;
 125
 126              case 3: /* range check/bounds check */
 127                sig = SIGFPE; code = FPE_FLTSUB;
 128                break;
 129
 130              case 4: /* null pointer dereference */
 131                sig = SIGSEGV; code = SEGV_MAPERR;
 132                break;
 133
 134              case 5: /* misaligned data */
 135                sig = SIGSEGV; code = BUS_ADRALN;
 136                break;
 137
 138              case 6: /* decimal overflow */
 139                sig = SIGFPE; code = __FPE_DECOVF;
 140                break;
 141
 142              case 7: /* decimal divide by zero */
 143                sig = SIGFPE; code = __FPE_DECDIV;
 144                break;
 145
 146              case 8: /* packed decimal error */
 147                sig = SIGFPE; code = __FPE_DECERR;
 148                break;
 149
 150              case 9: /* invalid ASCII digit */
 151                sig = SIGFPE; code = __FPE_INVASC;
 152                break;
 153
 154              case 10: /* invalid decimal digit */
 155                sig = SIGFPE; code = __FPE_INVDEC;
 156                break;
 157
 158              case 11: /* paragraph stack overflow */
 159                sig = SIGSEGV; code = __SEGV_PSTKOVF;
 160                break;
 161
 162              case 0x3f000 ... 0x3ffff: /* bundle-update in progress */
 163                sig = SIGILL; code = __ILL_BNDMOD;
 164                break;
 165
 166              default:
 167                if ((break_num < 0x40000 || break_num > 0x100000)
 168                    && die_if_kernel("Bad break", regs, break_num))
 169                        return;
 170
 171                if (break_num < 0x80000) {
 172                        sig = SIGILL; code = __ILL_BREAK;
 173                } else {
 174                        if (notify_die(DIE_BREAK, "bad break", regs, break_num, TRAP_BRKPT, SIGTRAP)
 175                                        == NOTIFY_STOP)
 176                                return;
 177                        sig = SIGTRAP; code = TRAP_BRKPT;
 178                }
 179        }
 180        siginfo.si_signo = sig;
 181        siginfo.si_errno = 0;
 182        siginfo.si_code = code;
 183        force_sig_info(sig, &siginfo, current);
 184}
 185
 186/*
 187 * disabled_fph_fault() is called when a user-level process attempts to access f32..f127
 188 * and it doesn't own the fp-high register partition.  When this happens, we save the
 189 * current fph partition in the task_struct of the fpu-owner (if necessary) and then load
 190 * the fp-high partition of the current task (if necessary).  Note that the kernel has
 191 * access to fph by the time we get here, as the IVT's "Disabled FP-Register" handler takes
 192 * care of clearing psr.dfh.
 193 */
 194static inline void
 195disabled_fph_fault (struct pt_regs *regs)
 196{
 197        struct ia64_psr *psr = ia64_psr(regs);
 198
 199        /* first, grant user-level access to fph partition: */
 200        psr->dfh = 0;
 201
 202        /*
 203         * Make sure that no other task gets in on this processor
 204         * while we're claiming the FPU
 205         */
 206        preempt_disable();
 207#ifndef CONFIG_SMP
 208        {
 209                struct task_struct *fpu_owner
 210                        = (struct task_struct *)ia64_get_kr(IA64_KR_FPU_OWNER);
 211
 212                if (ia64_is_local_fpu_owner(current)) {
 213                        preempt_enable_no_resched();
 214                        return;
 215                }
 216
 217                if (fpu_owner)
 218                        ia64_flush_fph(fpu_owner);
 219        }
 220#endif /* !CONFIG_SMP */
 221        ia64_set_local_fpu_owner(current);
 222        if ((current->thread.flags & IA64_THREAD_FPH_VALID) != 0) {
 223                __ia64_load_fpu(current->thread.fph);
 224                psr->mfh = 0;
 225        } else {
 226                __ia64_init_fpu();
 227                /*
 228                 * Set mfh because the state in thread.fph does not match the state in
 229                 * the fph partition.
 230                 */
 231                psr->mfh = 1;
 232        }
 233        preempt_enable_no_resched();
 234}
 235
 236static inline int
 237fp_emulate (int fp_fault, void *bundle, long *ipsr, long *fpsr, long *isr, long *pr, long *ifs,
 238            struct pt_regs *regs)
 239{
 240        fp_state_t fp_state;
 241        fpswa_ret_t ret;
 242
 243        if (!fpswa_interface)
 244                return -1;
 245
 246        memset(&fp_state, 0, sizeof(fp_state_t));
 247
 248        /*
 249         * compute fp_state.  only FP registers f6 - f11 are used by the
 250         * kernel, so set those bits in the mask and set the low volatile
 251         * pointer to point to these registers.
 252         */
 253        fp_state.bitmask_low64 = 0xfc0;  /* bit6..bit11 */
 254
 255        fp_state.fp_state_low_volatile = (fp_state_low_volatile_t *) &regs->f6;
 256        /*
 257         * unsigned long (*EFI_FPSWA) (
 258         *      unsigned long    trap_type,
 259         *      void             *Bundle,
 260         *      unsigned long    *pipsr,
 261         *      unsigned long    *pfsr,
 262         *      unsigned long    *pisr,
 263         *      unsigned long    *ppreds,
 264         *      unsigned long    *pifs,
 265         *      void             *fp_state);
 266         */
 267        ret = (*fpswa_interface->fpswa)((unsigned long) fp_fault, bundle,
 268                                        (unsigned long *) ipsr, (unsigned long *) fpsr,
 269                                        (unsigned long *) isr, (unsigned long *) pr,
 270                                        (unsigned long *) ifs, &fp_state);
 271
 272        return ret.status;
 273}
 274
 275struct fpu_swa_msg {
 276        unsigned long count;
 277        unsigned long time;
 278};
 279static DEFINE_PER_CPU(struct fpu_swa_msg, cpulast);
 280DECLARE_PER_CPU(struct fpu_swa_msg, cpulast);
 281static struct fpu_swa_msg last __cacheline_aligned;
 282
 283
 284/*
 285 * Handle floating-point assist faults and traps.
 286 */
 287static int
 288handle_fpu_swa (int fp_fault, struct pt_regs *regs, unsigned long isr)
 289{
 290        long exception, bundle[2];
 291        unsigned long fault_ip;
 292        struct siginfo siginfo;
 293
 294        fault_ip = regs->cr_iip;
 295        if (!fp_fault && (ia64_psr(regs)->ri == 0))
 296                fault_ip -= 16;
 297        if (copy_from_user(bundle, (void __user *) fault_ip, sizeof(bundle)))
 298                return -1;
 299
 300        if (!(current->thread.flags & IA64_THREAD_FPEMU_NOPRINT))  {
 301                unsigned long count, current_jiffies = jiffies;
 302                struct fpu_swa_msg *cp = this_cpu_ptr(&cpulast);
 303
 304                if (unlikely(current_jiffies > cp->time))
 305                        cp->count = 0;
 306                if (unlikely(cp->count < 5)) {
 307                        cp->count++;
 308                        cp->time = current_jiffies + 5 * HZ;
 309
 310                        /* minimize races by grabbing a copy of count BEFORE checking last.time. */
 311                        count = last.count;
 312                        barrier();
 313
 314                        /*
 315                         * Lower 4 bits are used as a count. Upper bits are a sequence
 316                         * number that is updated when count is reset. The cmpxchg will
 317                         * fail is seqno has changed. This minimizes mutiple cpus
 318                         * resetting the count.
 319                         */
 320                        if (current_jiffies > last.time)
 321                                (void) cmpxchg_acq(&last.count, count, 16 + (count & ~15));
 322
 323                        /* used fetchadd to atomically update the count */
 324                        if ((last.count & 15) < 5 && (ia64_fetchadd(1, &last.count, acq) & 15) < 5) {
 325                                last.time = current_jiffies + 5 * HZ;
 326                                printk(KERN_WARNING
 327                                        "%s(%d): floating-point assist fault at ip %016lx, isr %016lx\n",
 328                                        current->comm, task_pid_nr(current), regs->cr_iip + ia64_psr(regs)->ri, isr);
 329                        }
 330                }
 331        }
 332
 333        exception = fp_emulate(fp_fault, bundle, &regs->cr_ipsr, &regs->ar_fpsr, &isr, &regs->pr,
 334                               &regs->cr_ifs, regs);
 335        if (fp_fault) {
 336                if (exception == 0) {
 337                        /* emulation was successful */
 338                        ia64_increment_ip(regs);
 339                } else if (exception == -1) {
 340                        printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
 341                        return -1;
 342                } else {
 343                        /* is next instruction a trap? */
 344                        if (exception & 2) {
 345                                ia64_increment_ip(regs);
 346                        }
 347                        siginfo.si_signo = SIGFPE;
 348                        siginfo.si_errno = 0;
 349                        siginfo.si_code = __SI_FAULT;   /* default code */
 350                        siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
 351                        if (isr & 0x11) {
 352                                siginfo.si_code = FPE_FLTINV;
 353                        } else if (isr & 0x22) {
 354                                /* denormal operand gets the same si_code as underflow 
 355                                * see arch/i386/kernel/traps.c:math_error()  */
 356                                siginfo.si_code = FPE_FLTUND;
 357                        } else if (isr & 0x44) {
 358                                siginfo.si_code = FPE_FLTDIV;
 359                        }
 360                        siginfo.si_isr = isr;
 361                        siginfo.si_flags = __ISR_VALID;
 362                        siginfo.si_imm = 0;
 363                        force_sig_info(SIGFPE, &siginfo, current);
 364                }
 365        } else {
 366                if (exception == -1) {
 367                        printk(KERN_ERR "handle_fpu_swa: fp_emulate() returned -1\n");
 368                        return -1;
 369                } else if (exception != 0) {
 370                        /* raise exception */
 371                        siginfo.si_signo = SIGFPE;
 372                        siginfo.si_errno = 0;
 373                        siginfo.si_code = __SI_FAULT;   /* default code */
 374                        siginfo.si_addr = (void __user *) (regs->cr_iip + ia64_psr(regs)->ri);
 375                        if (isr & 0x880) {
 376                                siginfo.si_code = FPE_FLTOVF;
 377                        } else if (isr & 0x1100) {
 378                                siginfo.si_code = FPE_FLTUND;
 379                        } else if (isr & 0x2200) {
 380                                siginfo.si_code = FPE_FLTRES;
 381                        }
 382                        siginfo.si_isr = isr;
 383                        siginfo.si_flags = __ISR_VALID;
 384                        siginfo.si_imm = 0;
 385                        force_sig_info(SIGFPE, &siginfo, current);
 386                }
 387        }
 388        return 0;
 389}
 390
 391struct illegal_op_return {
 392        unsigned long fkt, arg1, arg2, arg3;
 393};
 394
 395struct illegal_op_return
 396ia64_illegal_op_fault (unsigned long ec, long arg1, long arg2, long arg3,
 397                       long arg4, long arg5, long arg6, long arg7,
 398                       struct pt_regs regs)
 399{
 400        struct illegal_op_return rv;
 401        struct siginfo si;
 402        char buf[128];
 403
 404#ifdef CONFIG_IA64_BRL_EMU
 405        {
 406                extern struct illegal_op_return ia64_emulate_brl (struct pt_regs *, unsigned long);
 407
 408                rv = ia64_emulate_brl(&regs, ec);
 409                if (rv.fkt != (unsigned long) -1)
 410                        return rv;
 411        }
 412#endif
 413
 414        sprintf(buf, "IA-64 Illegal operation fault");
 415        rv.fkt = 0;
 416        if (die_if_kernel(buf, &regs, 0))
 417                return rv;
 418
 419        memset(&si, 0, sizeof(si));
 420        si.si_signo = SIGILL;
 421        si.si_code = ILL_ILLOPC;
 422        si.si_addr = (void __user *) (regs.cr_iip + ia64_psr(&regs)->ri);
 423        force_sig_info(SIGILL, &si, current);
 424        return rv;
 425}
 426
 427void __kprobes
 428ia64_fault (unsigned long vector, unsigned long isr, unsigned long ifa,
 429            unsigned long iim, unsigned long itir, long arg5, long arg6,
 430            long arg7, struct pt_regs regs)
 431{
 432        unsigned long code, error = isr, iip;
 433        struct siginfo siginfo;
 434        char buf[128];
 435        int result, sig;
 436        static const char *reason[] = {
 437                "IA-64 Illegal Operation fault",
 438                "IA-64 Privileged Operation fault",
 439                "IA-64 Privileged Register fault",
 440                "IA-64 Reserved Register/Field fault",
 441                "Disabled Instruction Set Transition fault",
 442                "Unknown fault 5", "Unknown fault 6", "Unknown fault 7", "Illegal Hazard fault",
 443                "Unknown fault 9", "Unknown fault 10", "Unknown fault 11", "Unknown fault 12",
 444                "Unknown fault 13", "Unknown fault 14", "Unknown fault 15"
 445        };
 446
 447        if ((isr & IA64_ISR_NA) && ((isr & IA64_ISR_CODE_MASK) == IA64_ISR_CODE_LFETCH)) {
 448                /*
 449                 * This fault was due to lfetch.fault, set "ed" bit in the psr to cancel
 450                 * the lfetch.
 451                 */
 452                ia64_psr(&regs)->ed = 1;
 453                return;
 454        }
 455
 456        iip = regs.cr_iip + ia64_psr(&regs)->ri;
 457
 458        switch (vector) {
 459              case 24: /* General Exception */
 460                code = (isr >> 4) & 0xf;
 461                sprintf(buf, "General Exception: %s%s", reason[code],
 462                        (code == 3) ? ((isr & (1UL << 37))
 463                                       ? " (RSE access)" : " (data access)") : "");
 464                if (code == 8) {
 465# ifdef CONFIG_IA64_PRINT_HAZARDS
 466                        printk("%s[%d]: possible hazard @ ip=%016lx (pr = %016lx)\n",
 467                               current->comm, task_pid_nr(current),
 468                               regs.cr_iip + ia64_psr(&regs)->ri, regs.pr);
 469# endif
 470                        return;
 471                }
 472                break;
 473
 474              case 25: /* Disabled FP-Register */
 475                if (isr & 2) {
 476                        disabled_fph_fault(&regs);
 477                        return;
 478                }
 479                sprintf(buf, "Disabled FPL fault---not supposed to happen!");
 480                break;
 481
 482              case 26: /* NaT Consumption */
 483                if (user_mode(&regs)) {
 484                        void __user *addr;
 485
 486                        if (((isr >> 4) & 0xf) == 2) {
 487                                /* NaT page consumption */
 488                                sig = SIGSEGV;
 489                                code = SEGV_ACCERR;
 490                                addr = (void __user *) ifa;
 491                        } else {
 492                                /* register NaT consumption */
 493                                sig = SIGILL;
 494                                code = ILL_ILLOPN;
 495                                addr = (void __user *) (regs.cr_iip
 496                                                        + ia64_psr(&regs)->ri);
 497                        }
 498                        siginfo.si_signo = sig;
 499                        siginfo.si_code = code;
 500                        siginfo.si_errno = 0;
 501                        siginfo.si_addr = addr;
 502                        siginfo.si_imm = vector;
 503                        siginfo.si_flags = __ISR_VALID;
 504                        siginfo.si_isr = isr;
 505                        force_sig_info(sig, &siginfo, current);
 506                        return;
 507                } else if (ia64_done_with_exception(&regs))
 508                        return;
 509                sprintf(buf, "NaT consumption");
 510                break;
 511
 512              case 31: /* Unsupported Data Reference */
 513                if (user_mode(&regs)) {
 514                        siginfo.si_signo = SIGILL;
 515                        siginfo.si_code = ILL_ILLOPN;
 516                        siginfo.si_errno = 0;
 517                        siginfo.si_addr = (void __user *) iip;
 518                        siginfo.si_imm = vector;
 519                        siginfo.si_flags = __ISR_VALID;
 520                        siginfo.si_isr = isr;
 521                        force_sig_info(SIGILL, &siginfo, current);
 522                        return;
 523                }
 524                sprintf(buf, "Unsupported data reference");
 525                break;
 526
 527              case 29: /* Debug */
 528              case 35: /* Taken Branch Trap */
 529              case 36: /* Single Step Trap */
 530                if (fsys_mode(current, &regs)) {
 531                        extern char __kernel_syscall_via_break[];
 532                        /*
 533                         * Got a trap in fsys-mode: Taken Branch Trap
 534                         * and Single Step trap need special handling;
 535                         * Debug trap is ignored (we disable it here
 536                         * and re-enable it in the lower-privilege trap).
 537                         */
 538                        if (unlikely(vector == 29)) {
 539                                set_thread_flag(TIF_DB_DISABLED);
 540                                ia64_psr(&regs)->db = 0;
 541                                ia64_psr(&regs)->lp = 1;
 542                                return;
 543                        }
 544                        /* re-do the system call via break 0x100000: */
 545                        regs.cr_iip = (unsigned long) __kernel_syscall_via_break;
 546                        ia64_psr(&regs)->ri = 0;
 547                        ia64_psr(&regs)->cpl = 3;
 548                        return;
 549                }
 550                switch (vector) {
 551                      case 29:
 552                        siginfo.si_code = TRAP_HWBKPT;
 553#ifdef CONFIG_ITANIUM
 554                        /*
 555                         * Erratum 10 (IFA may contain incorrect address) now has
 556                         * "NoFix" status.  There are no plans for fixing this.
 557                         */
 558                        if (ia64_psr(&regs)->is == 0)
 559                          ifa = regs.cr_iip;
 560#endif
 561                        break;
 562                      case 35: siginfo.si_code = TRAP_BRANCH; ifa = 0; break;
 563                      case 36: siginfo.si_code = TRAP_TRACE; ifa = 0; break;
 564                }
 565                if (notify_die(DIE_FAULT, "ia64_fault", &regs, vector, siginfo.si_code, SIGTRAP)
 566                                == NOTIFY_STOP)
 567                        return;
 568                siginfo.si_signo = SIGTRAP;
 569                siginfo.si_errno = 0;
 570                siginfo.si_addr  = (void __user *) ifa;
 571                siginfo.si_imm   = 0;
 572                siginfo.si_flags = __ISR_VALID;
 573                siginfo.si_isr   = isr;
 574                force_sig_info(SIGTRAP, &siginfo, current);
 575                return;
 576
 577              case 32: /* fp fault */
 578              case 33: /* fp trap */
 579                result = handle_fpu_swa((vector == 32) ? 1 : 0, &regs, isr);
 580                if ((result < 0) || (current->thread.flags & IA64_THREAD_FPEMU_SIGFPE)) {
 581                        siginfo.si_signo = SIGFPE;
 582                        siginfo.si_errno = 0;
 583                        siginfo.si_code = FPE_FLTINV;
 584                        siginfo.si_addr = (void __user *) iip;
 585                        siginfo.si_flags = __ISR_VALID;
 586                        siginfo.si_isr = isr;
 587                        siginfo.si_imm = 0;
 588                        force_sig_info(SIGFPE, &siginfo, current);
 589                }
 590                return;
 591
 592              case 34:
 593                if (isr & 0x2) {
 594                        /* Lower-Privilege Transfer Trap */
 595
 596                        /* If we disabled debug traps during an fsyscall,
 597                         * re-enable them here.
 598                         */
 599                        if (test_thread_flag(TIF_DB_DISABLED)) {
 600                                clear_thread_flag(TIF_DB_DISABLED);
 601                                ia64_psr(&regs)->db = 1;
 602                        }
 603
 604                        /*
 605                         * Just clear PSR.lp and then return immediately:
 606                         * all the interesting work (e.g., signal delivery)
 607                         * is done in the kernel exit path.
 608                         */
 609                        ia64_psr(&regs)->lp = 0;
 610                        return;
 611                } else {
 612                        /* Unimplemented Instr. Address Trap */
 613                        if (user_mode(&regs)) {
 614                                siginfo.si_signo = SIGILL;
 615                                siginfo.si_code = ILL_BADIADDR;
 616                                siginfo.si_errno = 0;
 617                                siginfo.si_flags = 0;
 618                                siginfo.si_isr = 0;
 619                                siginfo.si_imm = 0;
 620                                siginfo.si_addr = (void __user *) iip;
 621                                force_sig_info(SIGILL, &siginfo, current);
 622                                return;
 623                        }
 624                        sprintf(buf, "Unimplemented Instruction Address fault");
 625                }
 626                break;
 627
 628              case 45:
 629                printk(KERN_ERR "Unexpected IA-32 exception (Trap 45)\n");
 630                printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx\n",
 631                       iip, ifa, isr);
 632                force_sig(SIGSEGV, current);
 633                return;
 634
 635              case 46:
 636                printk(KERN_ERR "Unexpected IA-32 intercept trap (Trap 46)\n");
 637                printk(KERN_ERR "  iip - 0x%lx, ifa - 0x%lx, isr - 0x%lx, iim - 0x%lx\n",
 638                       iip, ifa, isr, iim);
 639                force_sig(SIGSEGV, current);
 640                return;
 641
 642              case 47:
 643                sprintf(buf, "IA-32 Interruption Fault (int 0x%lx)", isr >> 16);
 644                break;
 645
 646              default:
 647                sprintf(buf, "Fault %lu", vector);
 648                break;
 649        }
 650        if (!die_if_kernel(buf, &regs, error))
 651                force_sig(SIGILL, current);
 652}
 653