LXR linux/arch/blackfin/kernel/traps.c

   1/*
   2 * Main exception handling logic.
   3 *
   4 * Copyright 2004-2010 Analog Devices Inc.
   5 *
   6 * Licensed under the GPL-2 or later
   7 */
   8
   9#include <linux/bug.h>
  10#include <linux/uaccess.h>
  11#include <linux/module.h>
  12#include <asm/traps.h>
  13#include <asm/cplb.h>
  14#include <asm/blackfin.h>
  15#include <asm/irq_handler.h>
  16#include <linux/irq.h>
  17#include <asm/trace.h>
  18#include <asm/fixed_code.h>
  19#include <asm/pseudo_instructions.h>
  20#include <asm/pda.h>
  21
  22#ifdef CONFIG_KGDB
  23# include <linux/kgdb.h>
  24
  25# define CHK_DEBUGGER_TRAP() \
  26        do { \
  27                kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
  28        } while (0)
  29# define CHK_DEBUGGER_TRAP_MAYBE() \
  30        do { \
  31                if (kgdb_connected) \
  32                        CHK_DEBUGGER_TRAP(); \
  33        } while (0)
  34#else
  35# define CHK_DEBUGGER_TRAP() do { } while (0)
  36# define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  37#endif
  38
  39
  40#ifdef CONFIG_DEBUG_VERBOSE
  41#define verbose_printk(fmt, arg...) \
  42        printk(fmt, ##arg)
  43#else
  44#define verbose_printk(fmt, arg...) \
  45        ({ if (0) printk(fmt, ##arg); 0; })
  46#endif
  47
  48#if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
  49u32 last_seqstat;
  50#ifdef CONFIG_DEBUG_MMRS_MODULE
  51EXPORT_SYMBOL(last_seqstat);
  52#endif
  53#endif
  54
  55/* Initiate the event table handler */
  56void __init trap_init(void)
  57{
  58        CSYNC();
  59        bfin_write_EVT3(trap);
  60        CSYNC();
  61}
  62
  63static int kernel_mode_regs(struct pt_regs *regs)
  64{
  65        return regs->ipend & 0xffc0;
  66}
  67
  68asmlinkage notrace void trap_c(struct pt_regs *fp)
  69{
  70#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
  71        int j;
  72#endif
  73#ifdef CONFIG_BFIN_PSEUDODBG_INSNS
  74        int opcode;
  75#endif
  76        unsigned int cpu = raw_smp_processor_id();
  77        const char *strerror = NULL;
  78        int sig = 0;
  79        siginfo_t info;
  80        unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
  81
  82        trace_buffer_save(j);
  83#if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
  84        last_seqstat = (u32)fp->seqstat;
  85#endif
  86
  87        /* Important - be very careful dereferncing pointers - will lead to
  88         * double faults if the stack has become corrupt
  89         */
  90
  91        /* trap_c() will be called for exceptions. During exceptions
  92         * processing, the pc value should be set with retx value.
  93         * With this change we can cleanup some code in signal.c- TODO
  94         */
  95        fp->orig_pc = fp->retx;
  96        /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
  97                trapnr, fp->ipend, fp->pc, fp->retx); */
  98
  99        /* send the appropriate signal to the user program */
 100        switch (trapnr) {
 101
 102        /* This table works in conjunction with the one in ./mach-common/entry.S
 103         * Some exceptions are handled there (in assembly, in exception space)
 104         * Some are handled here, (in C, in interrupt space)
 105         * Some, like CPLB, are handled in both, where the normal path is
 106         * handled in assembly/exception space, and the error path is handled
 107         * here
 108         */
 109
 110        /* 0x00 - Linux Syscall, getting here is an error */
 111        /* 0x01 - userspace gdb breakpoint, handled here */
 112        case VEC_EXCPT01:
 113                info.si_code = TRAP_ILLTRAP;
 114                sig = SIGTRAP;
 115                CHK_DEBUGGER_TRAP_MAYBE();
 116                /* Check if this is a breakpoint in kernel space */
 117                if (kernel_mode_regs(fp))
 118                        goto traps_done;
 119                else
 120                        break;
 121        /* 0x03 - User Defined, userspace stack overflow */
 122        case VEC_EXCPT03:
 123                info.si_code = SEGV_STACKFLOW;
 124                sig = SIGSEGV;
 125                strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
 126                CHK_DEBUGGER_TRAP_MAYBE();
 127                break;
 128        /* 0x02 - KGDB initial connection and break signal trap */
 129        case VEC_EXCPT02:
 130#ifdef CONFIG_KGDB
 131                info.si_code = TRAP_ILLTRAP;
 132                sig = SIGTRAP;
 133                CHK_DEBUGGER_TRAP();
 134                goto traps_done;
 135#endif
 136        /* 0x04 - User Defined */
 137        /* 0x05 - User Defined */
 138        /* 0x06 - User Defined */
 139        /* 0x07 - User Defined */
 140        /* 0x08 - User Defined */
 141        /* 0x09 - User Defined */
 142        /* 0x0A - User Defined */
 143        /* 0x0B - User Defined */
 144        /* 0x0C - User Defined */
 145        /* 0x0D - User Defined */
 146        /* 0x0E - User Defined */
 147        /* 0x0F - User Defined */
 148        /* If we got here, it is most likely that someone was trying to use a
 149         * custom exception handler, and it is not actually installed properly
 150         */
 151        case VEC_EXCPT04 ... VEC_EXCPT15:
 152                info.si_code = ILL_ILLPARAOP;
 153                sig = SIGILL;
 154                strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
 155                CHK_DEBUGGER_TRAP_MAYBE();
 156                break;
 157        /* 0x10 HW Single step, handled here */
 158        case VEC_STEP:
 159                info.si_code = TRAP_STEP;
 160                sig = SIGTRAP;
 161                CHK_DEBUGGER_TRAP_MAYBE();
 162                /* Check if this is a single step in kernel space */
 163                if (kernel_mode_regs(fp))
 164                        goto traps_done;
 165                else
 166                        break;
 167        /* 0x11 - Trace Buffer Full, handled here */
 168        case VEC_OVFLOW:
 169                info.si_code = TRAP_TRACEFLOW;
 170                sig = SIGTRAP;
 171                strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
 172                CHK_DEBUGGER_TRAP_MAYBE();
 173                break;
 174        /* 0x12 - Reserved, Caught by default */
 175        /* 0x13 - Reserved, Caught by default */
 176        /* 0x14 - Reserved, Caught by default */
 177        /* 0x15 - Reserved, Caught by default */
 178        /* 0x16 - Reserved, Caught by default */
 179        /* 0x17 - Reserved, Caught by default */
 180        /* 0x18 - Reserved, Caught by default */
 181        /* 0x19 - Reserved, Caught by default */
 182        /* 0x1A - Reserved, Caught by default */
 183        /* 0x1B - Reserved, Caught by default */
 184        /* 0x1C - Reserved, Caught by default */
 185        /* 0x1D - Reserved, Caught by default */
 186        /* 0x1E - Reserved, Caught by default */
 187        /* 0x1F - Reserved, Caught by default */
 188        /* 0x20 - Reserved, Caught by default */
 189        /* 0x21 - Undefined Instruction, handled here */
 190        case VEC_UNDEF_I:
 191#ifdef CONFIG_BUG
 192                if (kernel_mode_regs(fp)) {
 193                        switch (report_bug(fp->pc, fp)) {
 194                        case BUG_TRAP_TYPE_NONE:
 195                                break;
 196                        case BUG_TRAP_TYPE_WARN:
 197                                dump_bfin_trace_buffer();
 198                                fp->pc += 2;
 199                                goto traps_done;
 200                        case BUG_TRAP_TYPE_BUG:
 201                                /* call to panic() will dump trace, and it is
 202                                 * off at this point, so it won't be clobbered
 203                                 */
 204                                panic("BUG()");
 205                        }
 206                }
 207#endif
 208#ifdef CONFIG_BFIN_PSEUDODBG_INSNS
 209                /*
 210                 * Support for the fake instructions, if the instruction fails,
 211                 * then just execute a illegal opcode failure (like normal).
 212                 * Don't support these instructions inside the kernel
 213                 */
 214                if (!kernel_mode_regs(fp) && get_instruction(&opcode, (unsigned short *)fp->pc)) {
 215                        if (execute_pseudodbg_assert(fp, opcode))
 216                                goto traps_done;
 217                        if (execute_pseudodbg(fp, opcode))
 218                                goto traps_done;
 219                }
 220#endif
 221                info.si_code = ILL_ILLOPC;
 222                sig = SIGILL;
 223                strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
 224                CHK_DEBUGGER_TRAP_MAYBE();
 225                break;
 226        /* 0x22 - Illegal Instruction Combination, handled here */
 227        case VEC_ILGAL_I:
 228                info.si_code = ILL_ILLPARAOP;
 229                sig = SIGILL;
 230                strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
 231                CHK_DEBUGGER_TRAP_MAYBE();
 232                break;
 233        /* 0x23 - Data CPLB protection violation, handled here */
 234        case VEC_CPLB_VL:
 235                info.si_code = ILL_CPLB_VI;
 236                sig = SIGSEGV;
 237                strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
 238                CHK_DEBUGGER_TRAP_MAYBE();
 239                break;
 240        /* 0x24 - Data access misaligned, handled here */
 241        case VEC_MISALI_D:
 242                info.si_code = BUS_ADRALN;
 243                sig = SIGBUS;
 244                strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
 245                CHK_DEBUGGER_TRAP_MAYBE();
 246                break;
 247        /* 0x25 - Unrecoverable Event, handled here */
 248        case VEC_UNCOV:
 249                info.si_code = ILL_ILLEXCPT;
 250                sig = SIGILL;
 251                strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
 252                CHK_DEBUGGER_TRAP_MAYBE();
 253                break;
 254        /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 255                error case is handled here */
 256        case VEC_CPLB_M:
 257                info.si_code = BUS_ADRALN;
 258                sig = SIGBUS;
 259                strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
 260                break;
 261        /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 262        case VEC_CPLB_MHIT:
 263                info.si_code = ILL_CPLB_MULHIT;
 264                sig = SIGSEGV;
 265#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 266                if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
 267                        strerror = KERN_NOTICE "NULL pointer access\n";
 268                else
 269#endif
 270                        strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
 271                CHK_DEBUGGER_TRAP_MAYBE();
 272                break;
 273        /* 0x28 - Emulation Watchpoint, handled here */
 274        case VEC_WATCH:
 275                info.si_code = TRAP_WATCHPT;
 276                sig = SIGTRAP;
 277                pr_debug(EXC_0x28(KERN_DEBUG));
 278                CHK_DEBUGGER_TRAP_MAYBE();
 279                /* Check if this is a watchpoint in kernel space */
 280                if (kernel_mode_regs(fp))
 281                        goto traps_done;
 282                else
 283                        break;
 284#ifdef CONFIG_BF535
 285        /* 0x29 - Instruction fetch access error (535 only) */
 286        case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 287                info.si_code = BUS_OPFETCH;
 288                sig = SIGBUS;
 289                strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
 290                CHK_DEBUGGER_TRAP_MAYBE();
 291                break;
 292#else
 293        /* 0x29 - Reserved, Caught by default */
 294#endif
 295        /* 0x2A - Instruction fetch misaligned, handled here */
 296        case VEC_MISALI_I:
 297                info.si_code = BUS_ADRALN;
 298                sig = SIGBUS;
 299                strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
 300                CHK_DEBUGGER_TRAP_MAYBE();
 301                break;
 302        /* 0x2B - Instruction CPLB protection violation, handled here */
 303        case VEC_CPLB_I_VL:
 304                info.si_code = ILL_CPLB_VI;
 305                sig = SIGBUS;
 306                strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
 307                CHK_DEBUGGER_TRAP_MAYBE();
 308                break;
 309        /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 310        case VEC_CPLB_I_M:
 311                info.si_code = ILL_CPLB_MISS;
 312                sig = SIGBUS;
 313                strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
 314                break;
 315        /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 316        case VEC_CPLB_I_MHIT:
 317                info.si_code = ILL_CPLB_MULHIT;
 318                sig = SIGSEGV;
 319#ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 320                if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
 321                        strerror = KERN_NOTICE "Jump to NULL address\n";
 322                else
 323#endif
 324                        strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
 325                CHK_DEBUGGER_TRAP_MAYBE();
 326                break;
 327        /* 0x2E - Illegal use of Supervisor Resource, handled here */
 328        case VEC_ILL_RES:
 329                info.si_code = ILL_PRVOPC;
 330                sig = SIGILL;
 331                strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
 332                CHK_DEBUGGER_TRAP_MAYBE();
 333                break;
 334        /* 0x2F - Reserved, Caught by default */
 335        /* 0x30 - Reserved, Caught by default */
 336        /* 0x31 - Reserved, Caught by default */
 337        /* 0x32 - Reserved, Caught by default */
 338        /* 0x33 - Reserved, Caught by default */
 339        /* 0x34 - Reserved, Caught by default */
 340        /* 0x35 - Reserved, Caught by default */
 341        /* 0x36 - Reserved, Caught by default */
 342        /* 0x37 - Reserved, Caught by default */
 343        /* 0x38 - Reserved, Caught by default */
 344        /* 0x39 - Reserved, Caught by default */
 345        /* 0x3A - Reserved, Caught by default */
 346        /* 0x3B - Reserved, Caught by default */
 347        /* 0x3C - Reserved, Caught by default */
 348        /* 0x3D - Reserved, Caught by default */
 349        /* 0x3E - Reserved, Caught by default */
 350        /* 0x3F - Reserved, Caught by default */
 351        case VEC_HWERR:
 352                info.si_code = BUS_ADRALN;
 353                sig = SIGBUS;
 354                switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 355                /* System MMR Error */
 356                case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 357                        info.si_code = BUS_ADRALN;
 358                        sig = SIGBUS;
 359                        strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
 360                        break;
 361                /* External Memory Addressing Error */
 362                case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 363                        if (ANOMALY_05000310) {
 364                                static unsigned long anomaly_rets;
 365
 366                                if ((fp->pc >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
 367                                    (fp->pc < (L1_CODE_START + L1_CODE_LENGTH))) {
 368                                        /*
 369                                         * A false hardware error will happen while fetching at
 370                                         * the L1 instruction SRAM boundary.  Ignore it.
 371                                         */
 372                                        anomaly_rets = fp->rets;
 373                                        goto traps_done;
 374                                } else if (fp->rets == anomaly_rets) {
 375                                        /*
 376                                         * While boundary code returns to a function, at the ret
 377                                         * point, a new false hardware error might occur too based
 378                                         * on tests.  Ignore it too.
 379                                         */
 380                                        goto traps_done;
 381                                } else if ((fp->rets >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
 382                                           (fp->rets < (L1_CODE_START + L1_CODE_LENGTH))) {
 383                                        /*
 384                                         * If boundary code calls a function, at the entry point,
 385                                         * a new false hardware error maybe happen based on tests.
 386                                         * Ignore it too.
 387                                         */
 388                                        goto traps_done;
 389                                } else
 390                                        anomaly_rets = 0;
 391                        }
 392
 393                        info.si_code = BUS_ADRERR;
 394                        sig = SIGBUS;
 395                        strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
 396                        break;
 397                /* Performance Monitor Overflow */
 398                case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 399                        strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
 400                        break;
 401                /* RAISE 5 instruction */
 402                case (SEQSTAT_HWERRCAUSE_RAISE_5):
 403                        printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 404                        break;
 405                default:        /* Reserved */
 406                        printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 407                        break;
 408                }
 409                CHK_DEBUGGER_TRAP_MAYBE();
 410                break;
 411        /*
 412         * We should be handling all known exception types above,
 413         * if we get here we hit a reserved one, so panic
 414         */
 415        default:
 416                info.si_code = ILL_ILLPARAOP;
 417                sig = SIGILL;
 418                verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 419                        (fp->seqstat & SEQSTAT_EXCAUSE));
 420                CHK_DEBUGGER_TRAP_MAYBE();
 421                break;
 422        }
 423
 424        BUG_ON(sig == 0);
 425
 426        /* If the fault was caused by a kernel thread, or interrupt handler
 427         * we will kernel panic, so the system reboots.
 428         */
 429        if (kernel_mode_regs(fp) || (current && !current->mm)) {
 430                console_verbose();
 431                oops_in_progress = 1;
 432        }
 433
 434        if (sig != SIGTRAP) {
 435                if (strerror)
 436                        verbose_printk(strerror);
 437
 438                dump_bfin_process(fp);
 439                dump_bfin_mem(fp);
 440                show_regs(fp);
 441
 442                /* Print out the trace buffer if it makes sense */
 443#ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 444                if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 445                        verbose_printk(KERN_NOTICE "No trace since you do not have "
 446                               "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n");
 447                else
 448#endif
 449                        dump_bfin_trace_buffer();
 450
 451                if (oops_in_progress) {
 452                        /* Dump the current kernel stack */
 453                        verbose_printk(KERN_NOTICE "Kernel Stack\n");
 454                        show_stack(current, NULL);
 455                        print_modules();
 456#ifndef CONFIG_ACCESS_CHECK
 457                        verbose_printk(KERN_EMERG "Please turn on "
 458                               "CONFIG_ACCESS_CHECK\n");
 459#endif
 460                        panic("Kernel exception");
 461                } else {
 462#ifdef CONFIG_DEBUG_VERBOSE
 463                        unsigned long *stack;
 464                        /* Dump the user space stack */
 465                        stack = (unsigned long *)rdusp();
 466                        verbose_printk(KERN_NOTICE "Userspace Stack\n");
 467                        show_stack(NULL, stack);
 468#endif
 469                }
 470        }
 471
 472#ifdef CONFIG_IPIPE
 473        if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
 474#endif
 475        {
 476                info.si_signo = sig;
 477                info.si_errno = 0;
 478                switch (trapnr) {
 479                case VEC_CPLB_VL:
 480                case VEC_MISALI_D:
 481                case VEC_CPLB_M:
 482                case VEC_CPLB_MHIT:
 483                        info.si_addr = (void __user *)cpu_pda[cpu].dcplb_fault_addr;
 484                        break;
 485                default:
 486                        info.si_addr = (void __user *)fp->pc;
 487                        break;
 488                }
 489                force_sig_info(sig, &info, current);
 490        }
 491
 492        if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
 493            (ANOMALY_05000281 && trapnr == VEC_HWERR) ||
 494            (ANOMALY_05000189 && (trapnr == VEC_CPLB_I_VL || trapnr == VEC_CPLB_VL)))
 495                fp->pc = SAFE_USER_INSTRUCTION;
 496
 497 traps_done:
 498        trace_buffer_restore(j);
 499}
 500
 501asmlinkage void double_fault_c(struct pt_regs *fp)
 502{
 503#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 504        int j;
 505        trace_buffer_save(j);
 506#endif
 507
 508        console_verbose();
 509        oops_in_progress = 1;
 510#ifdef CONFIG_DEBUG_VERBOSE
 511        printk(KERN_EMERG "Double Fault\n");
 512#ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 513        if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 514                unsigned int cpu = raw_smp_processor_id();
 515                char buf[150];
 516                decode_address(buf, cpu_pda[cpu].retx_doublefault);
 517                printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 518                        (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
 519                decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
 520                printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 521                decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
 522                printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 523
 524                decode_address(buf, fp->retx);
 525                printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
 526        } else
 527#endif
 528        {
 529                dump_bfin_process(fp);
 530                dump_bfin_mem(fp);
 531                show_regs(fp);
 532                dump_bfin_trace_buffer();
 533        }
 534#endif
 535        panic("Double Fault - unrecoverable event");
 536
 537}
 538
 539
 540void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
 541{
 542        switch (cplb_panic) {
 543        case CPLB_NO_UNLOCKED:
 544                printk(KERN_EMERG "All CPLBs are locked\n");
 545                break;
 546        case CPLB_PROT_VIOL:
 547                return;
 548        case CPLB_NO_ADDR_MATCH:
 549                return;
 550        case CPLB_UNKNOWN_ERR:
 551                printk(KERN_EMERG "Unknown CPLB Exception\n");
 552                break;
 553        }
 554
 555        oops_in_progress = 1;
 556
 557        dump_bfin_process(fp);
 558        dump_bfin_mem(fp);
 559        show_regs(fp);
 560        dump_stack();
 561        panic("Unrecoverable event");
 562}
 563
 564#ifdef CONFIG_BUG
 565int is_valid_bugaddr(unsigned long addr)
 566{
 567        unsigned int opcode;
 568
 569        if (!get_instruction(&opcode, (unsigned short *)addr))
 570                return 0;
 571
 572        return opcode == BFIN_BUG_OPCODE;
 573}
 574#endif
 575
 576/* stub this out */
 577#ifndef CONFIG_DEBUG_VERBOSE
 578void show_regs(struct pt_regs *fp)
 579{
 580
 581}
 582#endif
 583