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