arch/mn10300/kernel/traps.c

   1 /* MN10300 Exception handling
   2  *
   3  * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
   4  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   5  * Modified by David Howells (dhowells@redhat.com)
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public Licence
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the Licence, or (at your option) any later version.
  11  */
  12 #include <linux/sched.h>
  13 #include <linux/sched/debug.h>
  14 #include <linux/kernel.h>
  15 #include <linux/string.h>
  16 #include <linux/errno.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/timer.h>
  19 #include <linux/mm.h>
  20 #include <linux/smp.h>
  21 #include <linux/init.h>
  22 #include <linux/delay.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/kallsyms.h>
  26 #include <linux/pci.h>
  27 #include <linux/kdebug.h>
  28 #include <linux/bug.h>
  29 #include <linux/irq.h>
  30 #include <linux/export.h>
  31 #include <asm/processor.h>
  32 #include <linux/uaccess.h>
  33 #include <asm/io.h>
  34 #include <linux/atomic.h>
  35 #include <asm/smp.h>
  36 #include <asm/pgalloc.h>
  37 #include <asm/cacheflush.h>
  38 #include <asm/cpu-regs.h>
  39 #include <asm/busctl-regs.h>
  40 #include <unit/leds.h>
  41 #include <asm/fpu.h>
  42 #include <asm/sections.h>
  43 #include <asm/debugger.h>
  44 #include "internal.h"
  45
  46 #if (CONFIG_INTERRUPT_VECTOR_BASE & 0xffffff)
  47 #error "INTERRUPT_VECTOR_BASE not aligned to 16MiB boundary!"
  48 #endif
  49
  50 int kstack_depth_to_print = 24;
  51
  52 spinlock_t die_lock = __SPIN_LOCK_UNLOCKED(die_lock);
  53
  54 struct exception_to_signal_map {
  55         u8      signo;
  56         u32     si_code;
  57 };
  58
  59 static const struct exception_to_signal_map exception_to_signal_map[256] = {
  60         /* MMU exceptions */
  61         [EXCEP_ITLBMISS >> 3]   = { 0, 0 },
  62         [EXCEP_DTLBMISS >> 3]   = { 0, 0 },
  63         [EXCEP_IAERROR >> 3]    = { 0, 0 },
  64         [EXCEP_DAERROR >> 3]    = { 0, 0 },
  65
  66         /* system exceptions */
  67         [EXCEP_TRAP >> 3]       = { SIGTRAP,    TRAP_BRKPT },
  68         [EXCEP_ISTEP >> 3]      = { SIGTRAP,    TRAP_TRACE },   /* Monitor */
  69         [EXCEP_IBREAK >> 3]     = { SIGTRAP,    TRAP_HWBKPT },  /* Monitor */
  70         [EXCEP_OBREAK >> 3]     = { SIGTRAP,    TRAP_HWBKPT },  /* Monitor */
  71         [EXCEP_PRIVINS >> 3]    = { SIGILL,     ILL_PRVOPC },
  72         [EXCEP_UNIMPINS >> 3]   = { SIGILL,     ILL_ILLOPC },
  73         [EXCEP_UNIMPEXINS >> 3] = { SIGILL,     ILL_ILLOPC },
  74         [EXCEP_MEMERR >> 3]     = { SIGSEGV,    SEGV_ACCERR },
  75         [EXCEP_MISALIGN >> 3]   = { SIGBUS,     BUS_ADRALN },
  76         [EXCEP_BUSERROR >> 3]   = { SIGBUS,     BUS_ADRERR },
  77         [EXCEP_ILLINSACC >> 3]  = { SIGSEGV,    SEGV_ACCERR },
  78         [EXCEP_ILLDATACC >> 3]  = { SIGSEGV,    SEGV_ACCERR },
  79         [EXCEP_IOINSACC >> 3]   = { SIGSEGV,    SEGV_ACCERR },
  80         [EXCEP_PRIVINSACC >> 3] = { SIGSEGV,    SEGV_ACCERR }, /* userspace */
  81         [EXCEP_PRIVDATACC >> 3] = { SIGSEGV,    SEGV_ACCERR }, /* userspace */
  82         [EXCEP_DATINSACC >> 3]  = { SIGSEGV,    SEGV_ACCERR },
  83         [EXCEP_DOUBLE_FAULT >> 3] = { SIGILL,   ILL_BADSTK },
  84
  85         /* FPU exceptions */
  86         [EXCEP_FPU_DISABLED >> 3] = { SIGILL,   ILL_COPROC },
  87         [EXCEP_FPU_UNIMPINS >> 3] = { SIGILL,   ILL_COPROC },
  88         [EXCEP_FPU_OPERATION >> 3] = { SIGFPE,  FPE_INTDIV },
  89
  90         /* interrupts */
  91         [EXCEP_WDT >> 3]        = { SIGALRM,    0 },
  92         [EXCEP_NMI >> 3]        = { SIGQUIT,    0 },
  93         [EXCEP_IRQ_LEVEL0 >> 3] = { SIGINT,     0 },
  94         [EXCEP_IRQ_LEVEL1 >> 3] = { 0, 0 },
  95         [EXCEP_IRQ_LEVEL2 >> 3] = { 0, 0 },
  96         [EXCEP_IRQ_LEVEL3 >> 3] = { 0, 0 },
  97         [EXCEP_IRQ_LEVEL4 >> 3] = { 0, 0 },
  98         [EXCEP_IRQ_LEVEL5 >> 3] = { 0, 0 },
  99         [EXCEP_IRQ_LEVEL6 >> 3] = { 0, 0 },
 100
 101         /* system calls */
 102         [EXCEP_SYSCALL0 >> 3]   = { 0, 0 },
 103         [EXCEP_SYSCALL1 >> 3]   = { SIGILL,     ILL_ILLTRP },
 104         [EXCEP_SYSCALL2 >> 3]   = { SIGILL,     ILL_ILLTRP },
 105         [EXCEP_SYSCALL3 >> 3]   = { SIGILL,     ILL_ILLTRP },
 106         [EXCEP_SYSCALL4 >> 3]   = { SIGILL,     ILL_ILLTRP },
 107         [EXCEP_SYSCALL5 >> 3]   = { SIGILL,     ILL_ILLTRP },
 108         [EXCEP_SYSCALL6 >> 3]   = { SIGILL,     ILL_ILLTRP },
 109         [EXCEP_SYSCALL7 >> 3]   = { SIGILL,     ILL_ILLTRP },
 110         [EXCEP_SYSCALL8 >> 3]   = { SIGILL,     ILL_ILLTRP },
 111         [EXCEP_SYSCALL9 >> 3]   = { SIGILL,     ILL_ILLTRP },
 112         [EXCEP_SYSCALL10 >> 3]  = { SIGILL,     ILL_ILLTRP },
 113         [EXCEP_SYSCALL11 >> 3]  = { SIGILL,     ILL_ILLTRP },
 114         [EXCEP_SYSCALL12 >> 3]  = { SIGILL,     ILL_ILLTRP },
 115         [EXCEP_SYSCALL13 >> 3]  = { SIGILL,     ILL_ILLTRP },
 116         [EXCEP_SYSCALL14 >> 3]  = { SIGILL,     ILL_ILLTRP },
 117         [EXCEP_SYSCALL15 >> 3]  = { SIGABRT,    0 },
 118 };
 119
 120 /*
 121  * Handle kernel exceptions.
 122  *
 123  * See if there's a fixup handler we can force a jump to when an exception
 124  * happens due to something kernel code did
 125  */
 126 int die_if_no_fixup(const char *str, struct pt_regs *regs,
 127                     enum exception_code code)
 128 {
 129         u8 opcode;
 130         int signo, si_code;
 131
 132         if (user_mode(regs))
 133                 return 0;
 134
 135         peripheral_leds_display_exception(code);
 136
 137         signo = exception_to_signal_map[code >> 3].signo;
 138         si_code = exception_to_signal_map[code >> 3].si_code;
 139
 140         switch (code) {
 141                 /* see if we can fixup the kernel accessing memory */
 142         case EXCEP_ITLBMISS:
 143         case EXCEP_DTLBMISS:
 144         case EXCEP_IAERROR:
 145         case EXCEP_DAERROR:
 146         case EXCEP_MEMERR:
 147         case EXCEP_MISALIGN:
 148         case EXCEP_BUSERROR:
 149         case EXCEP_ILLDATACC:
 150         case EXCEP_IOINSACC:
 151         case EXCEP_PRIVINSACC:
 152         case EXCEP_PRIVDATACC:
 153         case EXCEP_DATINSACC:
 154                 if (fixup_exception(regs))
 155                         return 1;
 156                 break;
 157
 158         case EXCEP_TRAP:
 159         case EXCEP_UNIMPINS:
 160                 if (probe_kernel_read(&opcode, (u8 *)regs->pc, 1) < 0)
 161                         break;
 162                 if (opcode == 0xff) {
 163                         if (notify_die(DIE_BREAKPOINT, str, regs, code, 0, 0))
 164                                 return 1;
 165                         if (at_debugger_breakpoint(regs))
 166                                 regs->pc++;
 167                         signo = SIGTRAP;
 168                         si_code = TRAP_BRKPT;
 169                 }
 170                 break;
 171
 172         case EXCEP_SYSCALL1 ... EXCEP_SYSCALL14:
 173                 /* syscall return addr is _after_ the instruction */
 174                 regs->pc -= 2;
 175                 break;
 176
 177         case EXCEP_SYSCALL15:
 178                 if (report_bug(regs->pc, regs) == BUG_TRAP_TYPE_WARN)
 179                         return 1;
 180
 181                 /* syscall return addr is _after_ the instruction */
 182                 regs->pc -= 2;
 183                 break;
 184
 185         default:
 186                 break;
 187         }
 188
 189         if (debugger_intercept(code, signo, si_code, regs) == 0)
 190                 return 1;
 191
 192         if (notify_die(DIE_GPF, str, regs, code, 0, 0))
 193                 return 1;
 194
 195         /* make the process die as the last resort */
 196         die(str, regs, code);
 197 }
 198
 199 /*
 200  * General exception handler
 201  */
 202 asmlinkage void handle_exception(struct pt_regs *regs, u32 intcode)
 203 {
 204         siginfo_t info;
 205
 206         /* deal with kernel exceptions here */
 207         if (die_if_no_fixup(NULL, regs, intcode))
 208                 return;
 209
 210         /* otherwise it's a userspace exception */
 211         info.si_signo = exception_to_signal_map[intcode >> 3].signo;
 212         info.si_code = exception_to_signal_map[intcode >> 3].si_code;
 213         info.si_errno = 0;
 214         info.si_addr = (void *) regs->pc;
 215         force_sig_info(info.si_signo, &info, current);
 216 }
 217
 218 /*
 219  * handle NMI
 220  */
 221 asmlinkage void nmi(struct pt_regs *regs, enum exception_code code)
 222 {
 223         /* see if gdbstub wants to deal with it */
 224         if (debugger_intercept(code, SIGQUIT, 0, regs))
 225                 return;
 226
 227         printk(KERN_WARNING "--- Register Dump ---\n");
 228         show_registers(regs);
 229         printk(KERN_WARNING "---------------------\n");
 230 }
 231
 232 /*
 233  * show a stack trace from the specified stack pointer
 234  */
 235 void show_trace(unsigned long *sp)
 236 {
 237         unsigned long bottom, stack, addr, fp, raslot;
 238
 239         printk(KERN_EMERG "\nCall Trace:\n");
 240
 241         //stack = (unsigned long)sp;
 242         asm("mov sp,%0" : "=a"(stack));
 243         asm("mov a3,%0" : "=r"(fp));
 244
 245         raslot = ULONG_MAX;
 246         bottom = (stack + THREAD_SIZE) & ~(THREAD_SIZE - 1);
 247         for (; stack < bottom; stack += sizeof(addr)) {
 248                 addr = *(unsigned long *)stack;
 249                 if (stack == fp) {
 250                         if (addr > stack && addr < bottom) {
 251                                 fp = addr;
 252                                 raslot = stack + sizeof(addr);
 253                                 continue;
 254                         }
 255                         fp = 0;
 256                         raslot = ULONG_MAX;
 257                 }
 258
 259                 if (__kernel_text_address(addr)) {
 260                         printk(" [<%08lx>]", addr);
 261                         if (stack >= raslot)
 262                                 raslot = ULONG_MAX;
 263                         else
 264                                 printk(" ?");
 265                         print_symbol(" %s", addr);
 266                         printk("\n");
 267                 }
 268         }
 269
 270         printk("\n");
 271 }
 272
 273 /*
 274  * show the raw stack from the specified stack pointer
 275  */
 276 void show_stack(struct task_struct *task, unsigned long *sp)
 277 {
 278         unsigned long *stack;
 279         int i;
 280
 281         if (!sp)
 282                 sp = (unsigned long *) &sp;
 283
 284         stack = sp;
 285         printk(KERN_EMERG "Stack:");
 286         for (i = 0; i < kstack_depth_to_print; i++) {
 287                 if (((long) stack & (THREAD_SIZE - 1)) == 0)
 288                         break;
 289                 if ((i % 8) == 0)
 290                         printk(KERN_EMERG "  ");
 291                 printk("%08lx ", *stack++);
 292         }
 293
 294         show_trace(sp);
 295 }
 296
 297 /*
 298  * dump the register file in the specified exception frame
 299  */
 300 void show_registers_only(struct pt_regs *regs)
 301 {
 302         unsigned long ssp;
 303
 304         ssp = (unsigned long) regs + sizeof(*regs);
 305
 306         printk(KERN_EMERG "PC:  %08lx EPSW:  %08lx  SSP: %08lx mode: %s\n",
 307                regs->pc, regs->epsw, ssp, user_mode(regs) ? "User" : "Super");
 308         printk(KERN_EMERG "d0:  %08lx   d1:  %08lx   d2: %08lx   d3: %08lx\n",
 309                regs->d0, regs->d1, regs->d2, regs->d3);
 310         printk(KERN_EMERG "a0:  %08lx   a1:  %08lx   a2: %08lx   a3: %08lx\n",
 311                regs->a0, regs->a1, regs->a2, regs->a3);
 312         printk(KERN_EMERG "e0:  %08lx   e1:  %08lx   e2: %08lx   e3: %08lx\n",
 313                regs->e0, regs->e1, regs->e2, regs->e3);
 314         printk(KERN_EMERG "e4:  %08lx   e5:  %08lx   e6: %08lx   e7: %08lx\n",
 315                regs->e4, regs->e5, regs->e6, regs->e7);
 316         printk(KERN_EMERG "lar: %08lx   lir: %08lx  mdr: %08lx  usp: %08lx\n",
 317                regs->lar, regs->lir, regs->mdr, regs->sp);
 318         printk(KERN_EMERG "cvf: %08lx   crl: %08lx  crh: %08lx  drq: %08lx\n",
 319                regs->mcvf, regs->mcrl, regs->mcrh, regs->mdrq);
 320         printk(KERN_EMERG "threadinfo=%p task=%p)\n",
 321                current_thread_info(), current);
 322
 323         if ((unsigned long) current >= PAGE_OFFSET &&
 324             (unsigned long) current < (unsigned long)high_memory)
 325                 printk(KERN_EMERG "Process %s (pid: %d)\n",
 326                        current->comm, current->pid);
 327
 328 #ifdef CONFIG_SMP
 329         printk(KERN_EMERG "CPUID:  %08x\n", CPUID);
 330 #endif
 331         printk(KERN_EMERG "CPUP:   %04hx\n", CPUP);
 332         printk(KERN_EMERG "TBR:    %08x\n", TBR);
 333         printk(KERN_EMERG "DEAR:   %08x\n", DEAR);
 334         printk(KERN_EMERG "sISR:   %08x\n", sISR);
 335         printk(KERN_EMERG "NMICR:  %04hx\n", NMICR);
 336         printk(KERN_EMERG "BCBERR: %08x\n", BCBERR);
 337         printk(KERN_EMERG "BCBEAR: %08x\n", BCBEAR);
 338         printk(KERN_EMERG "MMUFCR: %08x\n", MMUFCR);
 339         printk(KERN_EMERG "IPTEU : %08x  IPTEL2: %08x\n", IPTEU, IPTEL2);
 340         printk(KERN_EMERG "DPTEU:  %08x  DPTEL2: %08x\n", DPTEU, DPTEL2);
 341 }
 342
 343 /*
 344  * dump the registers and the stack
 345  */
 346 void show_registers(struct pt_regs *regs)
 347 {
 348         unsigned long sp;
 349         int i;
 350
 351         show_registers_only(regs);
 352
 353         if (!user_mode(regs))
 354                 sp = (unsigned long) regs + sizeof(*regs);
 355         else
 356                 sp = regs->sp;
 357
 358         /* when in-kernel, we also print out the stack and code at the
 359          * time of the fault..
 360          */
 361         if (!user_mode(regs)) {
 362                 printk(KERN_EMERG "\n");
 363                 show_stack(current, (unsigned long *) sp);
 364
 365 #if 0
 366                 printk(KERN_EMERG "\nCode: ");
 367                 if (regs->pc < PAGE_OFFSET)
 368                         goto bad;
 369
 370                 for (i = 0; i < 20; i++) {
 371                         unsigned char c;
 372                         if (__get_user(c, &((unsigned char *) regs->pc)[i]))
 373                                 goto bad;
 374                         printk("%02x ", c);
 375                 }
 376 #else
 377                 i = 0;
 378 #endif
 379         }
 380
 381         printk("\n");
 382         return;
 383
 384 #if 0
 385 bad:
 386         printk(KERN_EMERG " Bad PC value.");
 387         break;
 388 #endif
 389 }
 390
 391 /*
 392  *
 393  */
 394 void show_trace_task(struct task_struct *tsk)
 395 {
 396         unsigned long sp = tsk->thread.sp;
 397
 398         /* User space on another CPU? */
 399         if ((sp ^ (unsigned long) tsk) & (PAGE_MASK << 1))
 400                 return;
 401
 402         show_trace((unsigned long *) sp);
 403 }
 404
 405 /*
 406  * note the untimely death of part of the kernel
 407  */
 408 void die(const char *str, struct pt_regs *regs, enum exception_code code)
 409 {
 410         console_verbose();
 411         spin_lock_irq(&die_lock);
 412         printk(KERN_EMERG "\n%s: %04x\n",
 413                str, code & 0xffff);
 414         show_registers(regs);
 415
 416         if (regs->pc >= 0x02000000 && regs->pc < 0x04000000 &&
 417             (regs->epsw & (EPSW_IM | EPSW_IE)) != (EPSW_IM | EPSW_IE)) {
 418                 printk(KERN_EMERG "Exception in usermode interrupt handler\n");
 419                 printk(KERN_EMERG "\nPlease connect to kernel debugger !!\n");
 420                 asm volatile ("0: bra 0b");
 421         }
 422
 423         spin_unlock_irq(&die_lock);
 424         do_exit(SIGSEGV);
 425 }
 426
 427 /*
 428  * display the register file when the stack pointer gets clobbered
 429  */
 430 asmlinkage void do_double_fault(struct pt_regs *regs)
 431 {
 432         struct task_struct *tsk = current;
 433
 434         strcpy(tsk->comm, "emergency tsk");
 435         tsk->pid = 0;
 436         console_verbose();
 437         printk(KERN_EMERG "--- double fault ---\n");
 438         show_registers(regs);
 439 }
 440
 441 /*
 442  * asynchronous bus error (external, usually I/O DMA)
 443  */
 444 asmlinkage void io_bus_error(u32 bcberr, u32 bcbear, struct pt_regs *regs)
 445 {
 446         console_verbose();
 447
 448         printk(KERN_EMERG "Asynchronous I/O Bus Error\n");
 449         printk(KERN_EMERG "==========================\n");
 450
 451         if (bcberr & BCBERR_BEME)
 452                 printk(KERN_EMERG "- Multiple recorded errors\n");
 453
 454         printk(KERN_EMERG "- Faulting Buses:%s%s%s\n",
 455                bcberr & BCBERR_BEMR_CI  ? " CPU-Ins-Fetch" : "",
 456                bcberr & BCBERR_BEMR_CD  ? " CPU-Data" : "",
 457                bcberr & BCBERR_BEMR_DMA ? " DMA" : "");
 458
 459         printk(KERN_EMERG "- %s %s access made to %s at address %08x\n",
 460                bcberr & BCBERR_BEBST ? "Burst" : "Single",
 461                bcberr & BCBERR_BERW ? "Read" : "Write",
 462                bcberr & BCBERR_BESB_MON  ? "Monitor Space" :
 463                bcberr & BCBERR_BESB_IO   ? "Internal CPU I/O Space" :
 464                bcberr & BCBERR_BESB_EX   ? "External I/O Bus" :
 465                bcberr & BCBERR_BESB_OPEX ? "External Memory Bus" :
 466                "On Chip Memory",
 467                bcbear
 468                );
 469
 470         printk(KERN_EMERG "- Detected by the %s\n",
 471                bcberr&BCBERR_BESD ? "Bus Control Unit" : "Slave Bus");
 472
 473 #ifdef CONFIG_PCI
 474 #define BRIDGEREGB(X) (*(volatile __u8  *)(0xBE040000 + (X)))
 475 #define BRIDGEREGW(X) (*(volatile __u16 *)(0xBE040000 + (X)))
 476 #define BRIDGEREGL(X) (*(volatile __u32 *)(0xBE040000 + (X)))
 477
 478         printk(KERN_EMERG "- PCI Memory Paging Reg:         %08x\n",
 479                *(volatile __u32 *) (0xBFFFFFF4));
 480         printk(KERN_EMERG "- PCI Bridge Base Address 0:     %08x\n",
 481                BRIDGEREGL(PCI_BASE_ADDRESS_0));
 482         printk(KERN_EMERG "- PCI Bridge AMPCI Base Address: %08x\n",
 483                BRIDGEREGL(0x48));
 484         printk(KERN_EMERG "- PCI Bridge Command:                %04hx\n",
 485                BRIDGEREGW(PCI_COMMAND));
 486         printk(KERN_EMERG "- PCI Bridge Status:                 %04hx\n",
 487                BRIDGEREGW(PCI_STATUS));
 488         printk(KERN_EMERG "- PCI Bridge Int Status:         %08hx\n",
 489                BRIDGEREGL(0x4c));
 490 #endif
 491
 492         printk(KERN_EMERG "\n");
 493         show_registers(regs);
 494
 495         panic("Halted due to asynchronous I/O Bus Error\n");
 496 }
 497
 498 /*
 499  * handle an exception for which a handler has not yet been installed
 500  */
 501 asmlinkage void uninitialised_exception(struct pt_regs *regs,
 502                                         enum exception_code code)
 503 {
 504
 505         /* see if gdbstub wants to deal with it */
 506         if (debugger_intercept(code, SIGSYS, 0, regs) == 0)
 507                 return;
 508
 509         peripheral_leds_display_exception(code);
 510         printk(KERN_EMERG "Uninitialised Exception 0x%04x\n", code & 0xFFFF);
 511         show_registers(regs);
 512
 513         for (;;)
 514                 continue;
 515 }
 516
 517 /*
 518  * set an interrupt stub to jump to a handler
 519  * ! NOTE: this does *not* flush the caches
 520  */
 521 void __init __set_intr_stub(enum exception_code code, void *handler)
 522 {
 523         unsigned long addr;
 524         u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
 525
 526         addr = (unsigned long) handler - (unsigned long) vector;
 527         vector[0] = 0xdc;               /* JMP handler */
 528         vector[1] = addr;
 529         vector[2] = addr >> 8;
 530         vector[3] = addr >> 16;
 531         vector[4] = addr >> 24;
 532         vector[5] = 0xcb;
 533         vector[6] = 0xcb;
 534         vector[7] = 0xcb;
 535 }
 536
 537 /*
 538  * set an interrupt stub to jump to a handler
 539  */
 540 void __init set_intr_stub(enum exception_code code, void *handler)
 541 {
 542         unsigned long addr;
 543         u8 *vector = (u8 *)(CONFIG_INTERRUPT_VECTOR_BASE + code);
 544         unsigned long flags;
 545
 546         addr = (unsigned long) handler - (unsigned long) vector;
 547
 548         flags = arch_local_cli_save();
 549
 550         vector[0] = 0xdc;               /* JMP handler */
 551         vector[1] = addr;
 552         vector[2] = addr >> 8;
 553         vector[3] = addr >> 16;
 554         vector[4] = addr >> 24;
 555         vector[5] = 0xcb;
 556         vector[6] = 0xcb;
 557         vector[7] = 0xcb;
 558
 559         arch_local_irq_restore(flags);
 560
 561 #ifndef CONFIG_MN10300_CACHE_SNOOP
 562         mn10300_dcache_flush_inv();
 563         mn10300_icache_inv();
 564 #endif
 565 }
 566
 567 /*
 568  * initialise the exception table
 569  */
 570 void __init trap_init(void)
 571 {
 572         set_excp_vector(EXCEP_TRAP,             handle_exception);
 573         set_excp_vector(EXCEP_ISTEP,            handle_exception);
 574         set_excp_vector(EXCEP_IBREAK,           handle_exception);
 575         set_excp_vector(EXCEP_OBREAK,           handle_exception);
 576
 577         set_excp_vector(EXCEP_PRIVINS,          handle_exception);
 578         set_excp_vector(EXCEP_UNIMPINS,         handle_exception);
 579         set_excp_vector(EXCEP_UNIMPEXINS,       handle_exception);
 580         set_excp_vector(EXCEP_MEMERR,           handle_exception);
 581         set_excp_vector(EXCEP_MISALIGN,         misalignment);
 582         set_excp_vector(EXCEP_BUSERROR,         handle_exception);
 583         set_excp_vector(EXCEP_ILLINSACC,        handle_exception);
 584         set_excp_vector(EXCEP_ILLDATACC,        handle_exception);
 585         set_excp_vector(EXCEP_IOINSACC,         handle_exception);
 586         set_excp_vector(EXCEP_PRIVINSACC,       handle_exception);
 587         set_excp_vector(EXCEP_PRIVDATACC,       handle_exception);
 588         set_excp_vector(EXCEP_DATINSACC,        handle_exception);
 589         set_excp_vector(EXCEP_FPU_UNIMPINS,     handle_exception);
 590         set_excp_vector(EXCEP_FPU_OPERATION,    fpu_exception);
 591
 592         set_excp_vector(EXCEP_NMI,              nmi);
 593
 594         set_excp_vector(EXCEP_SYSCALL1,         handle_exception);
 595         set_excp_vector(EXCEP_SYSCALL2,         handle_exception);
 596         set_excp_vector(EXCEP_SYSCALL3,         handle_exception);
 597         set_excp_vector(EXCEP_SYSCALL4,         handle_exception);
 598         set_excp_vector(EXCEP_SYSCALL5,         handle_exception);
 599         set_excp_vector(EXCEP_SYSCALL6,         handle_exception);
 600         set_excp_vector(EXCEP_SYSCALL7,         handle_exception);
 601         set_excp_vector(EXCEP_SYSCALL8,         handle_exception);
 602         set_excp_vector(EXCEP_SYSCALL9,         handle_exception);
 603         set_excp_vector(EXCEP_SYSCALL10,        handle_exception);
 604         set_excp_vector(EXCEP_SYSCALL11,        handle_exception);
 605         set_excp_vector(EXCEP_SYSCALL12,        handle_exception);
 606         set_excp_vector(EXCEP_SYSCALL13,        handle_exception);
 607         set_excp_vector(EXCEP_SYSCALL14,        handle_exception);
 608         set_excp_vector(EXCEP_SYSCALL15,        handle_exception);
 609 }
 610
 611 /*
 612  * determine if a program counter value is a valid bug address
 613  */
 614 int is_valid_bugaddr(unsigned long pc)
 615 {
 616         return pc >= PAGE_OFFSET;
 617 }