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