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