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