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