arch/blackfin/kernel/traps.c

   1 /*
   2  * Main exception handling logic.
   3  *
   4  * Copyright 2004-2010 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later
   7  */
   8
   9 #include <linux/bug.h>
  10 #include <linux/uaccess.h>
  11 #include <linux/module.h>
  12 #include <asm/traps.h>
  13 #include <asm/cplb.h>
  14 #include <asm/blackfin.h>
  15 #include <asm/irq_handler.h>
  16 #include <linux/irq.h>
  17 #include <asm/trace.h>
  18 #include <asm/fixed_code.h>
  19 #include <asm/pseudo_instructions.h>
  20
  21 #ifdef CONFIG_KGDB
  22 # include <linux/kgdb.h>
  23
  24 # define CHK_DEBUGGER_TRAP() \
  25         do { \
  26                 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
  27         } while (0)
  28 # define CHK_DEBUGGER_TRAP_MAYBE() \
  29         do { \
  30                 if (kgdb_connected) \
  31                         CHK_DEBUGGER_TRAP(); \
  32         } while (0)
  33 #else
  34 # define CHK_DEBUGGER_TRAP() do { } while (0)
  35 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  36 #endif
  37
  38
  39 #ifdef CONFIG_DEBUG_VERBOSE
  40 #define verbose_printk(fmt, arg...) \
  41         printk(fmt, ##arg)
  42 #else
  43 #define verbose_printk(fmt, arg...) \
  44         ({ if (0) printk(fmt, ##arg); 0; })
  45 #endif
  46
  47 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
  48 u32 last_seqstat;
  49 #ifdef CONFIG_DEBUG_MMRS_MODULE
  50 EXPORT_SYMBOL(last_seqstat);
  51 #endif
  52 #endif
  53
  54 /* Initiate the event table handler */
  55 void __init trap_init(void)
  56 {
  57         CSYNC();
  58         bfin_write_EVT3(trap);
  59         CSYNC();
  60 }
  61
  62 static int kernel_mode_regs(struct pt_regs *regs)
  63 {
  64         return regs->ipend & 0xffc0;
  65 }
  66
  67 asmlinkage notrace void trap_c(struct pt_regs *fp)
  68 {
  69 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
  70         int j;
  71 #endif
  72 #ifdef CONFIG_BFIN_PSEUDODBG_INSNS
  73         int opcode;
  74 #endif
  75         unsigned int cpu = raw_smp_processor_id();
  76         const char *strerror = NULL;
  77         int sig = 0;
  78         siginfo_t info;
  79         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
  80
  81         trace_buffer_save(j);
  82 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
  83         last_seqstat = (u32)fp->seqstat;
  84 #endif
  85
  86         /* Important - be very careful dereferncing pointers - will lead to
  87          * double faults if the stack has become corrupt
  88          */
  89
  90         /* trap_c() will be called for exceptions. During exceptions
  91          * processing, the pc value should be set with retx value.
  92          * With this change we can cleanup some code in signal.c- TODO
  93          */
  94         fp->orig_pc = fp->retx;
  95         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
  96                 trapnr, fp->ipend, fp->pc, fp->retx); */
  97
  98         /* send the appropriate signal to the user program */
  99         switch (trapnr) {
 100
 101         /* This table works in conjuction with the one in ./mach-common/entry.S
 102          * Some exceptions are handled there (in assembly, in exception space)
 103          * Some are handled here, (in C, in interrupt space)
 104          * Some, like CPLB, are handled in both, where the normal path is
 105          * handled in assembly/exception space, and the error path is handled
 106          * here
 107          */
 108
 109         /* 0x00 - Linux Syscall, getting here is an error */
 110         /* 0x01 - userspace gdb breakpoint, handled here */
 111         case VEC_EXCPT01:
 112                 info.si_code = TRAP_ILLTRAP;
 113                 sig = SIGTRAP;
 114                 CHK_DEBUGGER_TRAP_MAYBE();
 115                 /* Check if this is a breakpoint in kernel space */
 116                 if (kernel_mode_regs(fp))
 117                         goto traps_done;
 118                 else
 119                         break;
 120         /* 0x03 - User Defined, userspace stack overflow */
 121         case VEC_EXCPT03:
 122                 info.si_code = SEGV_STACKFLOW;
 123                 sig = SIGSEGV;
 124                 strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
 125                 CHK_DEBUGGER_TRAP_MAYBE();
 126                 break;
 127         /* 0x02 - KGDB initial connection and break signal trap */
 128         case VEC_EXCPT02:
 129 #ifdef CONFIG_KGDB
 130                 info.si_code = TRAP_ILLTRAP;
 131                 sig = SIGTRAP;
 132                 CHK_DEBUGGER_TRAP();
 133                 goto traps_done;
 134 #endif
 135         /* 0x04 - User Defined */
 136         /* 0x05 - User Defined */
 137         /* 0x06 - User Defined */
 138         /* 0x07 - User Defined */
 139         /* 0x08 - User Defined */
 140         /* 0x09 - User Defined */
 141         /* 0x0A - User Defined */
 142         /* 0x0B - User Defined */
 143         /* 0x0C - User Defined */
 144         /* 0x0D - User Defined */
 145         /* 0x0E - User Defined */
 146         /* 0x0F - User Defined */
 147         /* If we got here, it is most likely that someone was trying to use a
 148          * custom exception handler, and it is not actually installed properly
 149          */
 150         case VEC_EXCPT04 ... VEC_EXCPT15:
 151                 info.si_code = ILL_ILLPARAOP;
 152                 sig = SIGILL;
 153                 strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
 154                 CHK_DEBUGGER_TRAP_MAYBE();
 155                 break;
 156         /* 0x10 HW Single step, handled here */
 157         case VEC_STEP:
 158                 info.si_code = TRAP_STEP;
 159                 sig = SIGTRAP;
 160                 CHK_DEBUGGER_TRAP_MAYBE();
 161                 /* Check if this is a single step in kernel space */
 162                 if (kernel_mode_regs(fp))
 163                         goto traps_done;
 164                 else
 165                         break;
 166         /* 0x11 - Trace Buffer Full, handled here */
 167         case VEC_OVFLOW:
 168                 info.si_code = TRAP_TRACEFLOW;
 169                 sig = SIGTRAP;
 170                 strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
 171                 CHK_DEBUGGER_TRAP_MAYBE();
 172                 break;
 173         /* 0x12 - Reserved, Caught by default */
 174         /* 0x13 - Reserved, Caught by default */
 175         /* 0x14 - Reserved, Caught by default */
 176         /* 0x15 - Reserved, Caught by default */
 177         /* 0x16 - Reserved, Caught by default */
 178         /* 0x17 - Reserved, Caught by default */
 179         /* 0x18 - Reserved, Caught by default */
 180         /* 0x19 - Reserved, Caught by default */
 181         /* 0x1A - Reserved, Caught by default */
 182         /* 0x1B - Reserved, Caught by default */
 183         /* 0x1C - Reserved, Caught by default */
 184         /* 0x1D - Reserved, Caught by default */
 185         /* 0x1E - Reserved, Caught by default */
 186         /* 0x1F - Reserved, Caught by default */
 187         /* 0x20 - Reserved, Caught by default */
 188         /* 0x21 - Undefined Instruction, handled here */
 189         case VEC_UNDEF_I:
 190 #ifdef CONFIG_BUG
 191                 if (kernel_mode_regs(fp)) {
 192                         switch (report_bug(fp->pc, fp)) {
 193                         case BUG_TRAP_TYPE_NONE:
 194                                 break;
 195                         case BUG_TRAP_TYPE_WARN:
 196                                 dump_bfin_trace_buffer();
 197                                 fp->pc += 2;
 198                                 goto traps_done;
 199                         case BUG_TRAP_TYPE_BUG:
 200                                 /* call to panic() will dump trace, and it is
 201                                  * off at this point, so it won't be clobbered
 202                                  */
 203                                 panic("BUG()");
 204                         }
 205                 }
 206 #endif
 207 #ifdef CONFIG_BFIN_PSEUDODBG_INSNS
 208                 /*
 209                  * Support for the fake instructions, if the instruction fails,
 210                  * then just execute a illegal opcode failure (like normal).
 211                  * Don't support these instructions inside the kernel
 212                  */
 213                 if (!kernel_mode_regs(fp) && get_instruction(&opcode, (unsigned short *)fp->pc)) {
 214                         if (execute_pseudodbg_assert(fp, opcode))
 215                                 goto traps_done;
 216                 }
 217 #endif
 218                 info.si_code = ILL_ILLOPC;
 219                 sig = SIGILL;
 220                 strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
 221                 CHK_DEBUGGER_TRAP_MAYBE();
 222                 break;
 223         /* 0x22 - Illegal Instruction Combination, handled here */
 224         case VEC_ILGAL_I:
 225                 info.si_code = ILL_ILLPARAOP;
 226                 sig = SIGILL;
 227                 strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
 228                 CHK_DEBUGGER_TRAP_MAYBE();
 229                 break;
 230         /* 0x23 - Data CPLB protection violation, handled here */
 231         case VEC_CPLB_VL:
 232                 info.si_code = ILL_CPLB_VI;
 233                 sig = SIGSEGV;
 234                 strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
 235                 CHK_DEBUGGER_TRAP_MAYBE();
 236                 break;
 237         /* 0x24 - Data access misaligned, handled here */
 238         case VEC_MISALI_D:
 239                 info.si_code = BUS_ADRALN;
 240                 sig = SIGBUS;
 241                 strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
 242                 CHK_DEBUGGER_TRAP_MAYBE();
 243                 break;
 244         /* 0x25 - Unrecoverable Event, handled here */
 245         case VEC_UNCOV:
 246                 info.si_code = ILL_ILLEXCPT;
 247                 sig = SIGILL;
 248                 strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
 249                 CHK_DEBUGGER_TRAP_MAYBE();
 250                 break;
 251         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 252                 error case is handled here */
 253         case VEC_CPLB_M:
 254                 info.si_code = BUS_ADRALN;
 255                 sig = SIGBUS;
 256                 strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
 257                 break;
 258         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 259         case VEC_CPLB_MHIT:
 260                 info.si_code = ILL_CPLB_MULHIT;
 261                 sig = SIGSEGV;
 262 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 263                 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
 264                         strerror = KERN_NOTICE "NULL pointer access\n";
 265                 else
 266 #endif
 267                         strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
 268                 CHK_DEBUGGER_TRAP_MAYBE();
 269                 break;
 270         /* 0x28 - Emulation Watchpoint, handled here */
 271         case VEC_WATCH:
 272                 info.si_code = TRAP_WATCHPT;
 273                 sig = SIGTRAP;
 274                 pr_debug(EXC_0x28(KERN_DEBUG));
 275                 CHK_DEBUGGER_TRAP_MAYBE();
 276                 /* Check if this is a watchpoint in kernel space */
 277                 if (kernel_mode_regs(fp))
 278                         goto traps_done;
 279                 else
 280                         break;
 281 #ifdef CONFIG_BF535
 282         /* 0x29 - Instruction fetch access error (535 only) */
 283         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 284                 info.si_code = BUS_OPFETCH;
 285                 sig = SIGBUS;
 286                 strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
 287                 CHK_DEBUGGER_TRAP_MAYBE();
 288                 break;
 289 #else
 290         /* 0x29 - Reserved, Caught by default */
 291 #endif
 292         /* 0x2A - Instruction fetch misaligned, handled here */
 293         case VEC_MISALI_I:
 294                 info.si_code = BUS_ADRALN;
 295                 sig = SIGBUS;
 296                 strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
 297                 CHK_DEBUGGER_TRAP_MAYBE();
 298                 break;
 299         /* 0x2B - Instruction CPLB protection violation, handled here */
 300         case VEC_CPLB_I_VL:
 301                 info.si_code = ILL_CPLB_VI;
 302                 sig = SIGBUS;
 303                 strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
 304                 CHK_DEBUGGER_TRAP_MAYBE();
 305                 break;
 306         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 307         case VEC_CPLB_I_M:
 308                 info.si_code = ILL_CPLB_MISS;
 309                 sig = SIGBUS;
 310                 strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
 311                 break;
 312         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 313         case VEC_CPLB_I_MHIT:
 314                 info.si_code = ILL_CPLB_MULHIT;
 315                 sig = SIGSEGV;
 316 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 317                 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
 318                         strerror = KERN_NOTICE "Jump to NULL address\n";
 319                 else
 320 #endif
 321                         strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
 322                 CHK_DEBUGGER_TRAP_MAYBE();
 323                 break;
 324         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 325         case VEC_ILL_RES:
 326                 info.si_code = ILL_PRVOPC;
 327                 sig = SIGILL;
 328                 strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
 329                 CHK_DEBUGGER_TRAP_MAYBE();
 330                 break;
 331         /* 0x2F - Reserved, Caught by default */
 332         /* 0x30 - Reserved, Caught by default */
 333         /* 0x31 - Reserved, Caught by default */
 334         /* 0x32 - Reserved, Caught by default */
 335         /* 0x33 - Reserved, Caught by default */
 336         /* 0x34 - Reserved, Caught by default */
 337         /* 0x35 - Reserved, Caught by default */
 338         /* 0x36 - Reserved, Caught by default */
 339         /* 0x37 - Reserved, Caught by default */
 340         /* 0x38 - Reserved, Caught by default */
 341         /* 0x39 - Reserved, Caught by default */
 342         /* 0x3A - Reserved, Caught by default */
 343         /* 0x3B - Reserved, Caught by default */
 344         /* 0x3C - Reserved, Caught by default */
 345         /* 0x3D - Reserved, Caught by default */
 346         /* 0x3E - Reserved, Caught by default */
 347         /* 0x3F - Reserved, Caught by default */
 348         case VEC_HWERR:
 349                 info.si_code = BUS_ADRALN;
 350                 sig = SIGBUS;
 351                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 352                 /* System MMR Error */
 353                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 354                         info.si_code = BUS_ADRALN;
 355                         sig = SIGBUS;
 356                         strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
 357                         break;
 358                 /* External Memory Addressing Error */
 359                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 360                         if (ANOMALY_05000310) {
 361                                 static unsigned long anomaly_rets;
 362
 363                                 if ((fp->pc >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
 364                                     (fp->pc < (L1_CODE_START + L1_CODE_LENGTH))) {
 365                                         /*
 366                                          * A false hardware error will happen while fetching at
 367                                          * the L1 instruction SRAM boundary.  Ignore it.
 368                                          */
 369                                         anomaly_rets = fp->rets;
 370                                         goto traps_done;
 371                                 } else if (fp->rets == anomaly_rets) {
 372                                         /*
 373                                          * While boundary code returns to a function, at the ret
 374                                          * point, a new false hardware error might occur too based
 375                                          * on tests.  Ignore it too.
 376                                          */
 377                                         goto traps_done;
 378                                 } else if ((fp->rets >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
 379                                            (fp->rets < (L1_CODE_START + L1_CODE_LENGTH))) {
 380                                         /*
 381                                          * If boundary code calls a function, at the entry point,
 382                                          * a new false hardware error maybe happen based on tests.
 383                                          * Ignore it too.
 384                                          */
 385                                         goto traps_done;
 386                                 } else
 387                                         anomaly_rets = 0;
 388                         }
 389
 390                         info.si_code = BUS_ADRERR;
 391                         sig = SIGBUS;
 392                         strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
 393                         break;
 394                 /* Performance Monitor Overflow */
 395                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 396                         strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
 397                         break;
 398                 /* RAISE 5 instruction */
 399                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 400                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 401                         break;
 402                 default:        /* Reserved */
 403                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 404                         break;
 405                 }
 406                 CHK_DEBUGGER_TRAP_MAYBE();
 407                 break;
 408         /*
 409          * We should be handling all known exception types above,
 410          * if we get here we hit a reserved one, so panic
 411          */
 412         default:
 413                 info.si_code = ILL_ILLPARAOP;
 414                 sig = SIGILL;
 415                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 416                         (fp->seqstat & SEQSTAT_EXCAUSE));
 417                 CHK_DEBUGGER_TRAP_MAYBE();
 418                 break;
 419         }
 420
 421         BUG_ON(sig == 0);
 422
 423         /* If the fault was caused by a kernel thread, or interrupt handler
 424          * we will kernel panic, so the system reboots.
 425          */
 426         if (kernel_mode_regs(fp) || (current && !current->mm)) {
 427                 console_verbose();
 428                 oops_in_progress = 1;
 429         }
 430
 431         if (sig != SIGTRAP) {
 432                 if (strerror)
 433                         verbose_printk(strerror);
 434
 435                 dump_bfin_process(fp);
 436                 dump_bfin_mem(fp);
 437                 show_regs(fp);
 438
 439                 /* Print out the trace buffer if it makes sense */
 440 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 441                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 442                         verbose_printk(KERN_NOTICE "No trace since you do not have "
 443                                "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n");
 444                 else
 445 #endif
 446                         dump_bfin_trace_buffer();
 447
 448                 if (oops_in_progress) {
 449                         /* Dump the current kernel stack */
 450                         verbose_printk(KERN_NOTICE "Kernel Stack\n");
 451                         show_stack(current, NULL);
 452                         print_modules();
 453 #ifndef CONFIG_ACCESS_CHECK
 454                         verbose_printk(KERN_EMERG "Please turn on "
 455                                "CONFIG_ACCESS_CHECK\n");
 456 #endif
 457                         panic("Kernel exception");
 458                 } else {
 459 #ifdef CONFIG_DEBUG_VERBOSE
 460                         unsigned long *stack;
 461                         /* Dump the user space stack */
 462                         stack = (unsigned long *)rdusp();
 463                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
 464                         show_stack(NULL, stack);
 465 #endif
 466                 }
 467         }
 468
 469 #ifdef CONFIG_IPIPE
 470         if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
 471 #endif
 472         {
 473                 info.si_signo = sig;
 474                 info.si_errno = 0;
 475                 switch (trapnr) {
 476                 case VEC_CPLB_VL:
 477                 case VEC_MISALI_D:
 478                 case VEC_CPLB_M:
 479                 case VEC_CPLB_MHIT:
 480                         info.si_addr = (void __user *)cpu_pda[cpu].dcplb_fault_addr;
 481                         break;
 482                 default:
 483                         info.si_addr = (void __user *)fp->pc;
 484                         break;
 485                 }
 486                 force_sig_info(sig, &info, current);
 487         }
 488
 489         if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
 490             (ANOMALY_05000281 && trapnr == VEC_HWERR) ||
 491             (ANOMALY_05000189 && (trapnr == VEC_CPLB_I_VL || trapnr == VEC_CPLB_VL)))
 492                 fp->pc = SAFE_USER_INSTRUCTION;
 493
 494  traps_done:
 495         trace_buffer_restore(j);
 496 }
 497
 498 asmlinkage void double_fault_c(struct pt_regs *fp)
 499 {
 500 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 501         int j;
 502         trace_buffer_save(j);
 503 #endif
 504
 505         console_verbose();
 506         oops_in_progress = 1;
 507 #ifdef CONFIG_DEBUG_VERBOSE
 508         printk(KERN_EMERG "Double Fault\n");
 509 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 510         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 511                 unsigned int cpu = raw_smp_processor_id();
 512                 char buf[150];
 513                 decode_address(buf, cpu_pda[cpu].retx_doublefault);
 514                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 515                         (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
 516                 decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
 517                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 518                 decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
 519                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 520
 521                 decode_address(buf, fp->retx);
 522                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
 523         } else
 524 #endif
 525         {
 526                 dump_bfin_process(fp);
 527                 dump_bfin_mem(fp);
 528                 show_regs(fp);
 529                 dump_bfin_trace_buffer();
 530         }
 531 #endif
 532         panic("Double Fault - unrecoverable event");
 533
 534 }
 535
 536
 537 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
 538 {
 539         switch (cplb_panic) {
 540         case CPLB_NO_UNLOCKED:
 541                 printk(KERN_EMERG "All CPLBs are locked\n");
 542                 break;
 543         case CPLB_PROT_VIOL:
 544                 return;
 545         case CPLB_NO_ADDR_MATCH:
 546                 return;
 547         case CPLB_UNKNOWN_ERR:
 548                 printk(KERN_EMERG "Unknown CPLB Exception\n");
 549                 break;
 550         }
 551
 552         oops_in_progress = 1;
 553
 554         dump_bfin_process(fp);
 555         dump_bfin_mem(fp);
 556         show_regs(fp);
 557         dump_stack();
 558         panic("Unrecoverable event");
 559 }
 560
 561 #ifdef CONFIG_BUG
 562 int is_valid_bugaddr(unsigned long addr)
 563 {
 564         unsigned int opcode;
 565
 566         if (!get_instruction(&opcode, (unsigned short *)addr))
 567                 return 0;
 568
 569         return opcode == BFIN_BUG_OPCODE;
 570 }
 571 #endif
 572
 573 /* stub this out */
 574 #ifndef CONFIG_DEBUG_VERBOSE
 575 void show_regs(struct pt_regs *fp)
 576 {
 577
 578 }
 579 #endif