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 #include <asm/pda.h>
  21
  22 #ifdef CONFIG_KGDB
  23 # include <linux/kgdb.h>
  24
  25 # define CHK_DEBUGGER_TRAP() \
  26         do { \
  27                 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
  28         } while (0)
  29 # define CHK_DEBUGGER_TRAP_MAYBE() \
  30         do { \
  31                 if (kgdb_connected) \
  32                         CHK_DEBUGGER_TRAP(); \
  33         } while (0)
  34 #else
  35 # define CHK_DEBUGGER_TRAP() do { } while (0)
  36 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  37 #endif
  38
  39
  40 #ifdef CONFIG_DEBUG_VERBOSE
  41 #define verbose_printk(fmt, arg...) \
  42         printk(fmt, ##arg)
  43 #else
  44 #define verbose_printk(fmt, arg...) \
  45         ({ if (0) printk(fmt, ##arg); 0; })
  46 #endif
  47
  48 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
  49 u32 last_seqstat;
  50 #ifdef CONFIG_DEBUG_MMRS_MODULE
  51 EXPORT_SYMBOL(last_seqstat);
  52 #endif
  53 #endif
  54
  55 /* Initiate the event table handler */
  56 void __init trap_init(void)
  57 {
  58         CSYNC();
  59         bfin_write_EVT3(trap);
  60         CSYNC();
  61 }
  62
  63 static int kernel_mode_regs(struct pt_regs *regs)
  64 {
  65         return regs->ipend & 0xffc0;
  66 }
  67
  68 asmlinkage notrace void trap_c(struct pt_regs *fp)
  69 {
  70 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
  71         int j;
  72 #endif
  73 #ifdef CONFIG_BFIN_PSEUDODBG_INSNS
  74         int opcode;
  75 #endif
  76         unsigned int cpu = raw_smp_processor_id();
  77         const char *strerror = NULL;
  78         int sig = 0;
  79         siginfo_t info;
  80         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
  81
  82         trace_buffer_save(j);
  83 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
  84         last_seqstat = (u32)fp->seqstat;
  85 #endif
  86
  87         /* Important - be very careful dereferncing pointers - will lead to
  88          * double faults if the stack has become corrupt
  89          */
  90
  91         /* trap_c() will be called for exceptions. During exceptions
  92          * processing, the pc value should be set with retx value.
  93          * With this change we can cleanup some code in signal.c- TODO
  94          */
  95         fp->orig_pc = fp->retx;
  96         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
  97                 trapnr, fp->ipend, fp->pc, fp->retx); */
  98
  99         /* send the appropriate signal to the user program */
 100         switch (trapnr) {
 101
 102         /* This table works in conjunction with the one in ./mach-common/entry.S
 103          * Some exceptions are handled there (in assembly, in exception space)
 104          * Some are handled here, (in C, in interrupt space)
 105          * Some, like CPLB, are handled in both, where the normal path is
 106          * handled in assembly/exception space, and the error path is handled
 107          * here
 108          */
 109
 110         /* 0x00 - Linux Syscall, getting here is an error */
 111         /* 0x01 - userspace gdb breakpoint, handled here */
 112         case VEC_EXCPT01:
 113                 info.si_code = TRAP_ILLTRAP;
 114                 sig = SIGTRAP;
 115                 CHK_DEBUGGER_TRAP_MAYBE();
 116                 /* Check if this is a breakpoint in kernel space */
 117                 if (kernel_mode_regs(fp))
 118                         goto traps_done;
 119                 else
 120                         break;
 121         /* 0x03 - User Defined, userspace stack overflow */
 122         case VEC_EXCPT03:
 123                 info.si_code = SEGV_STACKFLOW;
 124                 sig = SIGSEGV;
 125                 strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
 126                 CHK_DEBUGGER_TRAP_MAYBE();
 127                 break;
 128         /* 0x02 - KGDB initial connection and break signal trap */
 129         case VEC_EXCPT02:
 130 #ifdef CONFIG_KGDB
 131                 info.si_code = TRAP_ILLTRAP;
 132                 sig = SIGTRAP;
 133                 CHK_DEBUGGER_TRAP();
 134                 goto traps_done;
 135 #endif
 136         /* 0x04 - User Defined */
 137         /* 0x05 - User Defined */
 138         /* 0x06 - User Defined */
 139         /* 0x07 - User Defined */
 140         /* 0x08 - User Defined */
 141         /* 0x09 - User Defined */
 142         /* 0x0A - User Defined */
 143         /* 0x0B - User Defined */
 144         /* 0x0C - User Defined */
 145         /* 0x0D - User Defined */
 146         /* 0x0E - User Defined */
 147         /* 0x0F - User Defined */
 148         /* If we got here, it is most likely that someone was trying to use a
 149          * custom exception handler, and it is not actually installed properly
 150          */
 151         case VEC_EXCPT04 ... VEC_EXCPT15:
 152                 info.si_code = ILL_ILLPARAOP;
 153                 sig = SIGILL;
 154                 strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
 155                 CHK_DEBUGGER_TRAP_MAYBE();
 156                 break;
 157         /* 0x10 HW Single step, handled here */
 158         case VEC_STEP:
 159                 info.si_code = TRAP_STEP;
 160                 sig = SIGTRAP;
 161                 CHK_DEBUGGER_TRAP_MAYBE();
 162                 /* Check if this is a single step in kernel space */
 163                 if (kernel_mode_regs(fp))
 164                         goto traps_done;
 165                 else
 166                         break;
 167         /* 0x11 - Trace Buffer Full, handled here */
 168         case VEC_OVFLOW:
 169                 info.si_code = TRAP_TRACEFLOW;
 170                 sig = SIGTRAP;
 171                 strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
 172                 CHK_DEBUGGER_TRAP_MAYBE();
 173                 break;
 174         /* 0x12 - Reserved, Caught by default */
 175         /* 0x13 - Reserved, Caught by default */
 176         /* 0x14 - Reserved, Caught by default */
 177         /* 0x15 - Reserved, Caught by default */
 178         /* 0x16 - Reserved, Caught by default */
 179         /* 0x17 - Reserved, Caught by default */
 180         /* 0x18 - Reserved, Caught by default */
 181         /* 0x19 - Reserved, Caught by default */
 182         /* 0x1A - Reserved, Caught by default */
 183         /* 0x1B - Reserved, Caught by default */
 184         /* 0x1C - Reserved, Caught by default */
 185         /* 0x1D - Reserved, Caught by default */
 186         /* 0x1E - Reserved, Caught by default */
 187         /* 0x1F - Reserved, Caught by default */
 188         /* 0x20 - Reserved, Caught by default */
 189         /* 0x21 - Undefined Instruction, handled here */
 190         case VEC_UNDEF_I:
 191 #ifdef CONFIG_BUG
 192                 if (kernel_mode_regs(fp)) {
 193                         switch (report_bug(fp->pc, fp)) {
 194                         case BUG_TRAP_TYPE_NONE:
 195                                 break;
 196                         case BUG_TRAP_TYPE_WARN:
 197                                 dump_bfin_trace_buffer();
 198                                 fp->pc += 2;
 199                                 goto traps_done;
 200                         case BUG_TRAP_TYPE_BUG:
 201                                 /* call to panic() will dump trace, and it is
 202                                  * off at this point, so it won't be clobbered
 203                                  */
 204                                 panic("BUG()");
 205                         }
 206                 }
 207 #endif
 208 #ifdef CONFIG_BFIN_PSEUDODBG_INSNS
 209                 /*
 210                  * Support for the fake instructions, if the instruction fails,
 211                  * then just execute a illegal opcode failure (like normal).
 212                  * Don't support these instructions inside the kernel
 213                  */
 214                 if (!kernel_mode_regs(fp) && get_instruction(&opcode, (unsigned short *)fp->pc)) {
 215                         if (execute_pseudodbg_assert(fp, opcode))
 216                                 goto traps_done;
 217                         if (execute_pseudodbg(fp, opcode))
 218                                 goto traps_done;
 219                 }
 220 #endif
 221                 info.si_code = ILL_ILLOPC;
 222                 sig = SIGILL;
 223                 strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
 224                 CHK_DEBUGGER_TRAP_MAYBE();
 225                 break;
 226         /* 0x22 - Illegal Instruction Combination, handled here */
 227         case VEC_ILGAL_I:
 228                 info.si_code = ILL_ILLPARAOP;
 229                 sig = SIGILL;
 230                 strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
 231                 CHK_DEBUGGER_TRAP_MAYBE();
 232                 break;
 233         /* 0x23 - Data CPLB protection violation, handled here */
 234         case VEC_CPLB_VL:
 235                 info.si_code = ILL_CPLB_VI;
 236                 sig = SIGSEGV;
 237                 strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
 238                 CHK_DEBUGGER_TRAP_MAYBE();
 239                 break;
 240         /* 0x24 - Data access misaligned, handled here */
 241         case VEC_MISALI_D:
 242                 info.si_code = BUS_ADRALN;
 243                 sig = SIGBUS;
 244                 strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
 245                 CHK_DEBUGGER_TRAP_MAYBE();
 246                 break;
 247         /* 0x25 - Unrecoverable Event, handled here */
 248         case VEC_UNCOV:
 249                 info.si_code = ILL_ILLEXCPT;
 250                 sig = SIGILL;
 251                 strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
 252                 CHK_DEBUGGER_TRAP_MAYBE();
 253                 break;
 254         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 255                 error case is handled here */
 256         case VEC_CPLB_M:
 257                 info.si_code = BUS_ADRALN;
 258                 sig = SIGBUS;
 259                 strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
 260                 break;
 261         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 262         case VEC_CPLB_MHIT:
 263                 info.si_code = ILL_CPLB_MULHIT;
 264                 sig = SIGSEGV;
 265 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 266                 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
 267                         strerror = KERN_NOTICE "NULL pointer access\n";
 268                 else
 269 #endif
 270                         strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
 271                 CHK_DEBUGGER_TRAP_MAYBE();
 272                 break;
 273         /* 0x28 - Emulation Watchpoint, handled here */
 274         case VEC_WATCH:
 275                 info.si_code = TRAP_WATCHPT;
 276                 sig = SIGTRAP;
 277                 pr_debug(EXC_0x28(KERN_DEBUG));
 278                 CHK_DEBUGGER_TRAP_MAYBE();
 279                 /* Check if this is a watchpoint in kernel space */
 280                 if (kernel_mode_regs(fp))
 281                         goto traps_done;
 282                 else
 283                         break;
 284 #ifdef CONFIG_BF535
 285         /* 0x29 - Instruction fetch access error (535 only) */
 286         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 287                 info.si_code = BUS_OPFETCH;
 288                 sig = SIGBUS;
 289                 strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
 290                 CHK_DEBUGGER_TRAP_MAYBE();
 291                 break;
 292 #else
 293         /* 0x29 - Reserved, Caught by default */
 294 #endif
 295         /* 0x2A - Instruction fetch misaligned, handled here */
 296         case VEC_MISALI_I:
 297                 info.si_code = BUS_ADRALN;
 298                 sig = SIGBUS;
 299                 strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
 300                 CHK_DEBUGGER_TRAP_MAYBE();
 301                 break;
 302         /* 0x2B - Instruction CPLB protection violation, handled here */
 303         case VEC_CPLB_I_VL:
 304                 info.si_code = ILL_CPLB_VI;
 305                 sig = SIGBUS;
 306                 strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
 307                 CHK_DEBUGGER_TRAP_MAYBE();
 308                 break;
 309         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 310         case VEC_CPLB_I_M:
 311                 info.si_code = ILL_CPLB_MISS;
 312                 sig = SIGBUS;
 313                 strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
 314                 break;
 315         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 316         case VEC_CPLB_I_MHIT:
 317                 info.si_code = ILL_CPLB_MULHIT;
 318                 sig = SIGSEGV;
 319 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 320                 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
 321                         strerror = KERN_NOTICE "Jump to NULL address\n";
 322                 else
 323 #endif
 324                         strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
 325                 CHK_DEBUGGER_TRAP_MAYBE();
 326                 break;
 327         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 328         case VEC_ILL_RES:
 329                 info.si_code = ILL_PRVOPC;
 330                 sig = SIGILL;
 331                 strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
 332                 CHK_DEBUGGER_TRAP_MAYBE();
 333                 break;
 334         /* 0x2F - Reserved, Caught by default */
 335         /* 0x30 - Reserved, Caught by default */
 336         /* 0x31 - Reserved, Caught by default */
 337         /* 0x32 - Reserved, Caught by default */
 338         /* 0x33 - Reserved, Caught by default */
 339         /* 0x34 - Reserved, Caught by default */
 340         /* 0x35 - Reserved, Caught by default */
 341         /* 0x36 - Reserved, Caught by default */
 342         /* 0x37 - Reserved, Caught by default */
 343         /* 0x38 - Reserved, Caught by default */
 344         /* 0x39 - Reserved, Caught by default */
 345         /* 0x3A - Reserved, Caught by default */
 346         /* 0x3B - Reserved, Caught by default */
 347         /* 0x3C - Reserved, Caught by default */
 348         /* 0x3D - Reserved, Caught by default */
 349         /* 0x3E - Reserved, Caught by default */
 350         /* 0x3F - Reserved, Caught by default */
 351         case VEC_HWERR:
 352                 info.si_code = BUS_ADRALN;
 353                 sig = SIGBUS;
 354                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 355                 /* System MMR Error */
 356                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 357                         info.si_code = BUS_ADRALN;
 358                         sig = SIGBUS;
 359                         strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
 360                         break;
 361                 /* External Memory Addressing Error */
 362                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 363                         if (ANOMALY_05000310) {
 364                                 static unsigned long anomaly_rets;
 365
 366                                 if ((fp->pc >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
 367                                     (fp->pc < (L1_CODE_START + L1_CODE_LENGTH))) {
 368                                         /*
 369                                          * A false hardware error will happen while fetching at
 370                                          * the L1 instruction SRAM boundary.  Ignore it.
 371                                          */
 372                                         anomaly_rets = fp->rets;
 373                                         goto traps_done;
 374                                 } else if (fp->rets == anomaly_rets) {
 375                                         /*
 376                                          * While boundary code returns to a function, at the ret
 377                                          * point, a new false hardware error might occur too based
 378                                          * on tests.  Ignore it too.
 379                                          */
 380                                         goto traps_done;
 381                                 } else if ((fp->rets >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
 382                                            (fp->rets < (L1_CODE_START + L1_CODE_LENGTH))) {
 383                                         /*
 384                                          * If boundary code calls a function, at the entry point,
 385                                          * a new false hardware error maybe happen based on tests.
 386                                          * Ignore it too.
 387                                          */
 388                                         goto traps_done;
 389                                 } else
 390                                         anomaly_rets = 0;
 391                         }
 392
 393                         info.si_code = BUS_ADRERR;
 394                         sig = SIGBUS;
 395                         strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
 396                         break;
 397                 /* Performance Monitor Overflow */
 398                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 399                         strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
 400                         break;
 401                 /* RAISE 5 instruction */
 402                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 403                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 404                         break;
 405                 default:        /* Reserved */
 406                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 407                         break;
 408                 }
 409                 CHK_DEBUGGER_TRAP_MAYBE();
 410                 break;
 411         /*
 412          * We should be handling all known exception types above,
 413          * if we get here we hit a reserved one, so panic
 414          */
 415         default:
 416                 info.si_code = ILL_ILLPARAOP;
 417                 sig = SIGILL;
 418                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 419                         (fp->seqstat & SEQSTAT_EXCAUSE));
 420                 CHK_DEBUGGER_TRAP_MAYBE();
 421                 break;
 422         }
 423
 424         BUG_ON(sig == 0);
 425
 426         /* If the fault was caused by a kernel thread, or interrupt handler
 427          * we will kernel panic, so the system reboots.
 428          */
 429         if (kernel_mode_regs(fp) || (current && !current->mm)) {
 430                 console_verbose();
 431                 oops_in_progress = 1;
 432         }
 433
 434         if (sig != SIGTRAP) {
 435                 if (strerror)
 436                         verbose_printk(strerror);
 437
 438                 dump_bfin_process(fp);
 439                 dump_bfin_mem(fp);
 440                 show_regs(fp);
 441
 442                 /* Print out the trace buffer if it makes sense */
 443 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 444                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 445                         verbose_printk(KERN_NOTICE "No trace since you do not have "
 446                                "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n");
 447                 else
 448 #endif
 449                         dump_bfin_trace_buffer();
 450
 451                 if (oops_in_progress) {
 452                         /* Dump the current kernel stack */
 453                         verbose_printk(KERN_NOTICE "Kernel Stack\n");
 454                         show_stack(current, NULL);
 455                         print_modules();
 456 #ifndef CONFIG_ACCESS_CHECK
 457                         verbose_printk(KERN_EMERG "Please turn on "
 458                                "CONFIG_ACCESS_CHECK\n");
 459 #endif
 460                         panic("Kernel exception");
 461                 } else {
 462 #ifdef CONFIG_DEBUG_VERBOSE
 463                         unsigned long *stack;
 464                         /* Dump the user space stack */
 465                         stack = (unsigned long *)rdusp();
 466                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
 467                         show_stack(NULL, stack);
 468 #endif
 469                 }
 470         }
 471
 472 #ifdef CONFIG_IPIPE
 473         if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
 474 #endif
 475         {
 476                 info.si_signo = sig;
 477                 info.si_errno = 0;
 478                 switch (trapnr) {
 479                 case VEC_CPLB_VL:
 480                 case VEC_MISALI_D:
 481                 case VEC_CPLB_M:
 482                 case VEC_CPLB_MHIT:
 483                         info.si_addr = (void __user *)cpu_pda[cpu].dcplb_fault_addr;
 484                         break;
 485                 default:
 486                         info.si_addr = (void __user *)fp->pc;
 487                         break;
 488                 }
 489                 force_sig_info(sig, &info, current);
 490         }
 491
 492         if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
 493             (ANOMALY_05000281 && trapnr == VEC_HWERR) ||
 494             (ANOMALY_05000189 && (trapnr == VEC_CPLB_I_VL || trapnr == VEC_CPLB_VL)))
 495                 fp->pc = SAFE_USER_INSTRUCTION;
 496
 497  traps_done:
 498         trace_buffer_restore(j);
 499 }
 500
 501 asmlinkage void double_fault_c(struct pt_regs *fp)
 502 {
 503 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 504         int j;
 505         trace_buffer_save(j);
 506 #endif
 507
 508         console_verbose();
 509         oops_in_progress = 1;
 510 #ifdef CONFIG_DEBUG_VERBOSE
 511         printk(KERN_EMERG "Double Fault\n");
 512 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 513         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 514                 unsigned int cpu = raw_smp_processor_id();
 515                 char buf[150];
 516                 decode_address(buf, cpu_pda[cpu].retx_doublefault);
 517                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 518                         (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
 519                 decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
 520                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 521                 decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
 522                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 523
 524                 decode_address(buf, fp->retx);
 525                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
 526         } else
 527 #endif
 528         {
 529                 dump_bfin_process(fp);
 530                 dump_bfin_mem(fp);
 531                 show_regs(fp);
 532                 dump_bfin_trace_buffer();
 533         }
 534 #endif
 535         panic("Double Fault - unrecoverable event");
 536
 537 }
 538
 539
 540 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
 541 {
 542         switch (cplb_panic) {
 543         case CPLB_NO_UNLOCKED:
 544                 printk(KERN_EMERG "All CPLBs are locked\n");
 545                 break;
 546         case CPLB_PROT_VIOL:
 547                 return;
 548         case CPLB_NO_ADDR_MATCH:
 549                 return;
 550         case CPLB_UNKNOWN_ERR:
 551                 printk(KERN_EMERG "Unknown CPLB Exception\n");
 552                 break;
 553         }
 554
 555         oops_in_progress = 1;
 556
 557         dump_bfin_process(fp);
 558         dump_bfin_mem(fp);
 559         show_regs(fp);
 560         dump_stack();
 561         panic("Unrecoverable event");
 562 }
 563
 564 #ifdef CONFIG_BUG
 565 int is_valid_bugaddr(unsigned long addr)
 566 {
 567         unsigned int opcode;
 568
 569         if (!get_instruction(&opcode, (unsigned short *)addr))
 570                 return 0;
 571
 572         return opcode == BFIN_BUG_OPCODE;
 573 }
 574 #endif
 575
 576 /* stub this out */
 577 #ifndef CONFIG_DEBUG_VERBOSE
 578 void show_regs(struct pt_regs *fp)
 579 {
 580
 581 }
 582 #endif