arch/blackfin/kernel/traps.c

   1 /*
   2  * File:         arch/blackfin/kernel/traps.c
   3  * Based on:
   4  * Author:       Hamish Macdonald
   5  *
   6  * Created:
   7  * Description:  uses S/W interrupt 15 for the system calls
   8  *
   9  * Modified:
  10  *               Copyright 2004-2006 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 #include <linux/uaccess.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/module.h>
  33 #include <linux/kallsyms.h>
  34 #include <linux/fs.h>
  35 #include <asm/traps.h>
  36 #include <asm/cacheflush.h>
  37 #include <asm/cplb.h>
  38 #include <asm/blackfin.h>
  39 #include <asm/irq_handler.h>
  40 #include <linux/irq.h>
  41 #include <asm/trace.h>
  42 #include <asm/fixed_code.h>
  43 #include <asm/dma.h>
  44
  45 #ifdef CONFIG_KGDB
  46 # include <linux/debugger.h>
  47 # include <linux/kgdb.h>
  48
  49 # define CHK_DEBUGGER_TRAP() \
  50         do { \
  51                 CHK_DEBUGGER(trapnr, sig, info.si_code, fp, ); \
  52         } while (0)
  53 # define CHK_DEBUGGER_TRAP_MAYBE() \
  54         do { \
  55                 if (kgdb_connected) \
  56                         CHK_DEBUGGER_TRAP(); \
  57         } while (0)
  58 #else
  59 # define CHK_DEBUGGER_TRAP() do { } while (0)
  60 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  61 #endif
  62
  63 /* Initiate the event table handler */
  64 void __init trap_init(void)
  65 {
  66         CSYNC();
  67         bfin_write_EVT3(trap);
  68         CSYNC();
  69 }
  70
  71 unsigned long saved_icplb_fault_addr, saved_dcplb_fault_addr;
  72
  73 static void decode_address(char *buf, unsigned long address)
  74 {
  75         struct vm_list_struct *vml;
  76         struct task_struct *p;
  77         struct mm_struct *mm;
  78         unsigned long flags, offset;
  79         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
  80
  81 #ifdef CONFIG_KALLSYMS
  82         unsigned long symsize;
  83         const char *symname;
  84         char *modname;
  85         char *delim = ":";
  86         char namebuf[128];
  87
  88         /* look up the address and see if we are in kernel space */
  89         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
  90
  91         if (symname) {
  92                 /* yeah! kernel space! */
  93                 if (!modname)
  94                         modname = delim = "";
  95                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
  96                               (void *)address, delim, modname, delim, symname,
  97                               (unsigned long)offset);
  98                 return;
  99
 100         }
 101 #endif
 102
 103         /* Problem in fixed code section? */
 104         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 105                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
 106                 return;
 107         }
 108
 109         /* Problem somewhere before the kernel start address */
 110         if (address < CONFIG_BOOT_LOAD) {
 111                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
 112                 return;
 113         }
 114
 115         /* looks like we're off in user-land, so let's walk all the
 116          * mappings of all our processes and see if we can't be a whee
 117          * bit more specific
 118          */
 119         write_lock_irqsave(&tasklist_lock, flags);
 120         for_each_process(p) {
 121                 mm = (in_atomic ? p->mm : get_task_mm(p));
 122                 if (!mm)
 123                         continue;
 124
 125                 vml = mm->context.vmlist;
 126                 while (vml) {
 127                         struct vm_area_struct *vma = vml->vma;
 128
 129                         if (address >= vma->vm_start && address < vma->vm_end) {
 130                                 char _tmpbuf[256];
 131                                 char *name = p->comm;
 132                                 struct file *file = vma->vm_file;
 133
 134                                 if (file)
 135                                         name = d_path(&file->f_path, _tmpbuf,
 136                                                       sizeof(_tmpbuf));
 137
 138                                 /* FLAT does not have its text aligned to the start of
 139                                  * the map while FDPIC ELF does ...
 140                                  */
 141
 142                                 /* before we can check flat/fdpic, we need to
 143                                  * make sure current is valid
 144                                  */
 145                                 if ((unsigned long)current >= FIXED_CODE_START &&
 146                                     !((unsigned long)current & 0x3)) {
 147                                         if (current->mm &&
 148                                             (address > current->mm->start_code) &&
 149                                             (address < current->mm->end_code))
 150                                                 offset = address - current->mm->start_code;
 151                                         else
 152                                                 offset = (address - vma->vm_start) +
 153                                                          (vma->vm_pgoff << PAGE_SHIFT);
 154
 155                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 156                                                 (void *)address, name, offset);
 157                                 } else
 158                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
 159                                                 (void *)address, name,
 160                                                 vma->vm_start, vma->vm_end);
 161
 162                                 if (!in_atomic)
 163                                         mmput(mm);
 164
 165                                 if (!strlen(buf))
 166                                         sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
 167
 168                                 goto done;
 169                         }
 170
 171                         vml = vml->next;
 172                 }
 173                 if (!in_atomic)
 174                         mmput(mm);
 175         }
 176
 177         /* we were unable to find this address anywhere */
 178         sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
 179
 180 done:
 181         write_unlock_irqrestore(&tasklist_lock, flags);
 182 }
 183
 184 asmlinkage void double_fault_c(struct pt_regs *fp)
 185 {
 186         console_verbose();
 187         oops_in_progress = 1;
 188         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 189         dump_bfin_process(fp);
 190         dump_bfin_mem(fp);
 191         show_regs(fp);
 192         panic("Double Fault - unrecoverable event\n");
 193
 194 }
 195
 196 asmlinkage void trap_c(struct pt_regs *fp)
 197 {
 198 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 199         int j;
 200 #endif
 201         int sig = 0;
 202         siginfo_t info;
 203         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 204
 205         trace_buffer_save(j);
 206
 207         /* Important - be very careful dereferncing pointers - will lead to
 208          * double faults if the stack has become corrupt
 209          */
 210
 211         /* If the fault was caused by a kernel thread, or interrupt handler
 212          * we will kernel panic, so the system reboots.
 213          * If KGDB is enabled, don't set this for kernel breakpoints
 214         */
 215
 216         /* TODO: check to see if we are in some sort of deferred HWERR
 217          * that we should be able to recover from, not kernel panic
 218          */
 219         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
 220 #ifdef CONFIG_KGDB
 221                 && (trapnr != VEC_EXCPT02)
 222 #endif
 223         ){
 224                 console_verbose();
 225                 oops_in_progress = 1;
 226         } else if (current) {
 227                 if (current->mm == NULL) {
 228                         console_verbose();
 229                         oops_in_progress = 1;
 230                 }
 231         }
 232
 233         /* trap_c() will be called for exceptions. During exceptions
 234          * processing, the pc value should be set with retx value.
 235          * With this change we can cleanup some code in signal.c- TODO
 236          */
 237         fp->orig_pc = fp->retx;
 238         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 239                 trapnr, fp->ipend, fp->pc, fp->retx); */
 240
 241         /* send the appropriate signal to the user program */
 242         switch (trapnr) {
 243
 244         /* This table works in conjuction with the one in ./mach-common/entry.S
 245          * Some exceptions are handled there (in assembly, in exception space)
 246          * Some are handled here, (in C, in interrupt space)
 247          * Some, like CPLB, are handled in both, where the normal path is
 248          * handled in assembly/exception space, and the error path is handled
 249          * here
 250          */
 251
 252         /* 0x00 - Linux Syscall, getting here is an error */
 253         /* 0x01 - userspace gdb breakpoint, handled here */
 254         case VEC_EXCPT01:
 255                 info.si_code = TRAP_ILLTRAP;
 256                 sig = SIGTRAP;
 257                 CHK_DEBUGGER_TRAP_MAYBE();
 258                 /* Check if this is a breakpoint in kernel space */
 259                 if (fp->ipend & 0xffc0)
 260                         return;
 261                 else
 262                         break;
 263 #ifdef CONFIG_KGDB
 264         case VEC_EXCPT02 :               /* gdb connection */
 265                 info.si_code = TRAP_ILLTRAP;
 266                 sig = SIGTRAP;
 267                 CHK_DEBUGGER_TRAP();
 268                 return;
 269 #else
 270         /* 0x02 - User Defined, Caught by default */
 271 #endif
 272         /* 0x03 - User Defined, userspace stack overflow */
 273         case VEC_EXCPT03:
 274                 info.si_code = SEGV_STACKFLOW;
 275                 sig = SIGSEGV;
 276                 printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
 277                 CHK_DEBUGGER_TRAP();
 278                 break;
 279         /* 0x04 - User Defined, Caught by default */
 280         /* 0x05 - User Defined, Caught by default */
 281         /* 0x06 - User Defined, Caught by default */
 282         /* 0x07 - User Defined, Caught by default */
 283         /* 0x08 - User Defined, Caught by default */
 284         /* 0x09 - User Defined, Caught by default */
 285         /* 0x0A - User Defined, Caught by default */
 286         /* 0x0B - User Defined, Caught by default */
 287         /* 0x0C - User Defined, Caught by default */
 288         /* 0x0D - User Defined, Caught by default */
 289         /* 0x0E - User Defined, Caught by default */
 290         /* 0x0F - User Defined, Caught by default */
 291         /* 0x10 HW Single step, handled here */
 292         case VEC_STEP:
 293                 info.si_code = TRAP_STEP;
 294                 sig = SIGTRAP;
 295                 CHK_DEBUGGER_TRAP_MAYBE();
 296                 /* Check if this is a single step in kernel space */
 297                 if (fp->ipend & 0xffc0)
 298                         return;
 299                 else
 300                         break;
 301         /* 0x11 - Trace Buffer Full, handled here */
 302         case VEC_OVFLOW:
 303                 info.si_code = TRAP_TRACEFLOW;
 304                 sig = SIGTRAP;
 305                 printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
 306                 CHK_DEBUGGER_TRAP();
 307                 break;
 308         /* 0x12 - Reserved, Caught by default */
 309         /* 0x13 - Reserved, Caught by default */
 310         /* 0x14 - Reserved, Caught by default */
 311         /* 0x15 - Reserved, Caught by default */
 312         /* 0x16 - Reserved, Caught by default */
 313         /* 0x17 - Reserved, Caught by default */
 314         /* 0x18 - Reserved, Caught by default */
 315         /* 0x19 - Reserved, Caught by default */
 316         /* 0x1A - Reserved, Caught by default */
 317         /* 0x1B - Reserved, Caught by default */
 318         /* 0x1C - Reserved, Caught by default */
 319         /* 0x1D - Reserved, Caught by default */
 320         /* 0x1E - Reserved, Caught by default */
 321         /* 0x1F - Reserved, Caught by default */
 322         /* 0x20 - Reserved, Caught by default */
 323         /* 0x21 - Undefined Instruction, handled here */
 324         case VEC_UNDEF_I:
 325                 info.si_code = ILL_ILLOPC;
 326                 sig = SIGILL;
 327                 printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
 328                 CHK_DEBUGGER_TRAP();
 329                 break;
 330         /* 0x22 - Illegal Instruction Combination, handled here */
 331         case VEC_ILGAL_I:
 332                 info.si_code = ILL_ILLPARAOP;
 333                 sig = SIGILL;
 334                 printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
 335                 CHK_DEBUGGER_TRAP();
 336                 break;
 337         /* 0x23 - Data CPLB protection violation, handled here */
 338         case VEC_CPLB_VL:
 339                 info.si_code = ILL_CPLB_VI;
 340                 sig = SIGBUS;
 341                 printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
 342                 CHK_DEBUGGER_TRAP();
 343                 break;
 344         /* 0x24 - Data access misaligned, handled here */
 345         case VEC_MISALI_D:
 346                 info.si_code = BUS_ADRALN;
 347                 sig = SIGBUS;
 348                 printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
 349                 CHK_DEBUGGER_TRAP();
 350                 break;
 351         /* 0x25 - Unrecoverable Event, handled here */
 352         case VEC_UNCOV:
 353                 info.si_code = ILL_ILLEXCPT;
 354                 sig = SIGILL;
 355                 printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
 356                 CHK_DEBUGGER_TRAP();
 357                 break;
 358         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 359                 error case is handled here */
 360         case VEC_CPLB_M:
 361                 info.si_code = BUS_ADRALN;
 362                 sig = SIGBUS;
 363                 printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
 364                 CHK_DEBUGGER_TRAP();
 365                 break;
 366         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 367         case VEC_CPLB_MHIT:
 368                 info.si_code = ILL_CPLB_MULHIT;
 369                 sig = SIGSEGV;
 370 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 371                 if (saved_dcplb_fault_addr < FIXED_CODE_START)
 372                         printk(KERN_NOTICE "NULL pointer access\n");
 373                 else
 374 #endif
 375                         printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
 376                 CHK_DEBUGGER_TRAP();
 377                 break;
 378         /* 0x28 - Emulation Watchpoint, handled here */
 379         case VEC_WATCH:
 380                 info.si_code = TRAP_WATCHPT;
 381                 sig = SIGTRAP;
 382                 pr_debug(EXC_0x28(KERN_DEBUG));
 383                 CHK_DEBUGGER_TRAP_MAYBE();
 384                 /* Check if this is a watchpoint in kernel space */
 385                 if (fp->ipend & 0xffc0)
 386                         return;
 387                 else
 388                         break;
 389 #ifdef CONFIG_BF535
 390         /* 0x29 - Instruction fetch access error (535 only) */
 391         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 392                 info.si_code = BUS_OPFETCH;
 393                 sig = SIGBUS;
 394                 printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 395                 CHK_DEBUGGER_TRAP();
 396                 break;
 397 #else
 398         /* 0x29 - Reserved, Caught by default */
 399 #endif
 400         /* 0x2A - Instruction fetch misaligned, handled here */
 401         case VEC_MISALI_I:
 402                 info.si_code = BUS_ADRALN;
 403                 sig = SIGBUS;
 404                 printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
 405                 CHK_DEBUGGER_TRAP();
 406                 break;
 407         /* 0x2B - Instruction CPLB protection violation, handled here */
 408         case VEC_CPLB_I_VL:
 409                 info.si_code = ILL_CPLB_VI;
 410                 sig = SIGBUS;
 411                 printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
 412                 CHK_DEBUGGER_TRAP();
 413                 break;
 414         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 415         case VEC_CPLB_I_M:
 416                 info.si_code = ILL_CPLB_MISS;
 417                 sig = SIGBUS;
 418                 printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
 419                 CHK_DEBUGGER_TRAP();
 420                 break;
 421         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 422         case VEC_CPLB_I_MHIT:
 423                 info.si_code = ILL_CPLB_MULHIT;
 424                 sig = SIGSEGV;
 425 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 426                 if (saved_icplb_fault_addr < FIXED_CODE_START)
 427                         printk(KERN_NOTICE "Jump to NULL address\n");
 428                 else
 429 #endif
 430                         printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
 431                 CHK_DEBUGGER_TRAP();
 432                 break;
 433         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 434         case VEC_ILL_RES:
 435                 info.si_code = ILL_PRVOPC;
 436                 sig = SIGILL;
 437                 printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
 438                 CHK_DEBUGGER_TRAP();
 439                 break;
 440         /* 0x2F - Reserved, Caught by default */
 441         /* 0x30 - Reserved, Caught by default */
 442         /* 0x31 - Reserved, Caught by default */
 443         /* 0x32 - Reserved, Caught by default */
 444         /* 0x33 - Reserved, Caught by default */
 445         /* 0x34 - Reserved, Caught by default */
 446         /* 0x35 - Reserved, Caught by default */
 447         /* 0x36 - Reserved, Caught by default */
 448         /* 0x37 - Reserved, Caught by default */
 449         /* 0x38 - Reserved, Caught by default */
 450         /* 0x39 - Reserved, Caught by default */
 451         /* 0x3A - Reserved, Caught by default */
 452         /* 0x3B - Reserved, Caught by default */
 453         /* 0x3C - Reserved, Caught by default */
 454         /* 0x3D - Reserved, Caught by default */
 455         /* 0x3E - Reserved, Caught by default */
 456         /* 0x3F - Reserved, Caught by default */
 457         case VEC_HWERR:
 458                 info.si_code = BUS_ADRALN;
 459                 sig = SIGBUS;
 460                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 461                 /* System MMR Error */
 462                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 463                         info.si_code = BUS_ADRALN;
 464                         sig = SIGBUS;
 465                         printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
 466                         break;
 467                 /* External Memory Addressing Error */
 468                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 469                         info.si_code = BUS_ADRERR;
 470                         sig = SIGBUS;
 471                         printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
 472                         break;
 473                 /* Performance Monitor Overflow */
 474                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 475                         printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
 476                         break;
 477                 /* RAISE 5 instruction */
 478                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 479                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 480                         break;
 481                 default:        /* Reserved */
 482                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 483                         break;
 484                 }
 485                 CHK_DEBUGGER_TRAP();
 486                 break;
 487         default:
 488                 info.si_code = TRAP_ILLTRAP;
 489                 sig = SIGTRAP;
 490                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 491                         (fp->seqstat & SEQSTAT_EXCAUSE));
 492                 CHK_DEBUGGER_TRAP();
 493                 break;
 494         }
 495
 496         BUG_ON(sig == 0);
 497
 498         if (sig != SIGTRAP) {
 499                 unsigned long *stack;
 500                 dump_bfin_process(fp);
 501                 dump_bfin_mem(fp);
 502                 show_regs(fp);
 503
 504                 /* Print out the trace buffer if it makes sense */
 505 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 506                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 507                         printk(KERN_NOTICE "No trace since you do not have "
 508                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 509                                 KERN_NOTICE "\n");
 510                 else
 511 #endif
 512                         dump_bfin_trace_buffer();
 513
 514                 if (oops_in_progress) {
 515                         /* Dump the current kernel stack */
 516                         printk(KERN_NOTICE "\n" KERN_NOTICE "Kernel Stack\n");
 517                         show_stack(current, NULL);
 518
 519                         print_modules();
 520 #ifndef CONFIG_ACCESS_CHECK
 521                         printk(KERN_EMERG "Please turn on "
 522                                "CONFIG_ACCESS_CHECK\n");
 523 #endif
 524                         panic("Kernel exception");
 525                 } else {
 526                         /* Dump the user space stack */
 527                         stack = (unsigned long *)rdusp();
 528                         printk(KERN_NOTICE "Userspace Stack\n");
 529                         show_stack(NULL, stack);
 530                 }
 531         }
 532
 533         info.si_signo = sig;
 534         info.si_errno = 0;
 535         info.si_addr = (void __user *)fp->pc;
 536         force_sig_info(sig, &info, current);
 537
 538         trace_buffer_restore(j);
 539         return;
 540 }
 541
 542 /* Typical exception handling routines  */
 543
 544 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 545
 546 /*
 547  * Similar to get_user, do some address checking, then dereference
 548  * Return true on sucess, false on bad address
 549  */
 550 bool get_instruction(unsigned short *val, unsigned short *address)
 551 {
 552
 553         unsigned long addr;
 554
 555         addr = (unsigned long)address;
 556
 557         /* Check for odd addresses */
 558         if (addr & 0x1)
 559                 return false;
 560
 561         /* Check that things do not wrap around */
 562         if (addr > (addr + 2))
 563                 return false;
 564
 565         /*
 566          * Since we are in exception context, we need to do a little address checking
 567          * We need to make sure we are only accessing valid memory, and
 568          * we don't read something in the async space that can hang forever
 569          */
 570         if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
 571 #if L2_LENGTH != 0
 572             (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
 573 #endif
 574             (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||
 575 #if L1_DATA_A_LENGTH != 0
 576             (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) ||
 577 #endif
 578 #if L1_DATA_B_LENGTH != 0
 579             (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) ||
 580 #endif
 581             (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) ||
 582             (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) &&
 583                addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) ||
 584             (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) &&
 585                addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) ||
 586             (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) &&
 587                addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) ||
 588             (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) &&
 589               addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) {
 590                 *val = *address;
 591                 return true;
 592         }
 593
 594 #if L1_CODE_LENGTH != 0
 595         if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) {
 596                 dma_memcpy(val, address, 2);
 597                 return true;
 598         }
 599 #endif
 600
 601
 602         return false;
 603 }
 604
 605 /*
 606  * decode the instruction if we are printing out the trace, as it
 607  * makes things easier to follow, without running it through objdump
 608  * These are the normal instructions which cause change of flow, which
 609  * would be at the source of the trace buffer
 610  */
 611 void decode_instruction(unsigned short *address)
 612 {
 613         unsigned short opcode;
 614
 615         if (get_instruction(&opcode, address)) {
 616                 if (opcode == 0x0010)
 617                         printk("RTS");
 618                 else if (opcode == 0x0011)
 619                         printk("RTI");
 620                 else if (opcode == 0x0012)
 621                         printk("RTX");
 622                 else if (opcode >= 0x0050 && opcode <= 0x0057)
 623                         printk("JUMP (P%i)", opcode & 7);
 624                 else if (opcode >= 0x0060 && opcode <= 0x0067)
 625                         printk("CALL (P%i)", opcode & 7);
 626                 else if (opcode >= 0x0070 && opcode <= 0x0077)
 627                         printk("CALL (PC+P%i)", opcode & 7);
 628                 else if (opcode >= 0x0080 && opcode <= 0x0087)
 629                         printk("JUMP (PC+P%i)", opcode & 7);
 630                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
 631                         printk("IF !CC JUMP");
 632                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
 633                         printk("IF CC JUMP");
 634                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
 635                         printk("JUMP.S");
 636                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
 637                         printk("LSETUP");
 638                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
 639                         printk("JUMP.L");
 640                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
 641                         printk("CALL pcrel");
 642                 else
 643                         printk("0x%04x", opcode);
 644         }
 645
 646 }
 647
 648 void dump_bfin_trace_buffer(void)
 649 {
 650 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 651         int tflags, i = 0;
 652         char buf[150];
 653         unsigned short *addr;
 654 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 655         int j, index;
 656 #endif
 657
 658         trace_buffer_save(tflags);
 659
 660         printk(KERN_NOTICE "Hardware Trace:\n");
 661
 662 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 663         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
 664 #endif
 665
 666         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 667                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 668                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 669                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 670                         addr = (unsigned short *)bfin_read_TBUF();
 671                         decode_address(buf, (unsigned long)addr);
 672                         printk(KERN_NOTICE "     Source : %s ", buf);
 673                         decode_instruction(addr);
 674                         printk("\n");
 675                 }
 676         }
 677
 678 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 679         if (trace_buff_offset)
 680                 index = trace_buff_offset / 4;
 681         else
 682                 index = EXPAND_LEN;
 683
 684         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 685         while (j) {
 686                 decode_address(buf, software_trace_buff[index]);
 687                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 688                 index -= 1;
 689                 if (index < 0 )
 690                         index = EXPAND_LEN;
 691                 decode_address(buf, software_trace_buff[index]);
 692                 printk(KERN_NOTICE "     Source : %s ", buf);
 693                 decode_instruction((unsigned short *)software_trace_buff[index]);
 694                 printk("\n");
 695                 index -= 1;
 696                 if (index < 0)
 697                         index = EXPAND_LEN;
 698                 j--;
 699                 i++;
 700         }
 701 #endif
 702
 703         trace_buffer_restore(tflags);
 704 #endif
 705 }
 706 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 707
 708 /*
 709  * Checks to see if the address pointed to is either a
 710  * 16-bit CALL instruction, or a 32-bit CALL instruction
 711  */
 712 bool is_bfin_call(unsigned short *addr)
 713 {
 714         unsigned short opcode = 0, *ins_addr;
 715         ins_addr = (unsigned short *)addr;
 716
 717         if (!get_instruction(&opcode, ins_addr))
 718                 return false;
 719
 720         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
 721             (opcode >= 0x0070 && opcode <= 0x0077))
 722                 return true;
 723
 724         ins_addr--;
 725         if (!get_instruction(&opcode, ins_addr))
 726                 return false;
 727
 728         if (opcode >= 0xE300 && opcode <= 0xE3FF)
 729                 return true;
 730
 731         return false;
 732
 733 }
 734 void show_stack(struct task_struct *task, unsigned long *stack)
 735 {
 736         unsigned int *addr, *endstack, *fp = 0, *frame;
 737         unsigned short *ins_addr;
 738         char buf[150];
 739         unsigned int i, j, ret_addr, frame_no = 0;
 740
 741         /*
 742          * If we have been passed a specific stack, use that one otherwise
 743          *    if we have been passed a task structure, use that, otherwise
 744          *    use the stack of where the variable "stack" exists
 745          */
 746
 747         if (stack == NULL) {
 748                 if (task) {
 749                         /* We know this is a kernel stack, so this is the start/end */
 750                         stack = (unsigned long *)task->thread.ksp;
 751                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
 752                 } else {
 753                         /* print out the existing stack info */
 754                         stack = (unsigned long *)&stack;
 755                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 756                 }
 757         } else
 758                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 759
 760         decode_address(buf, (unsigned int)stack);
 761         printk(KERN_NOTICE "Stack info:\n" KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
 762         addr = (unsigned int *)((unsigned int)stack & ~0x3F);
 763
 764         /* First thing is to look for a frame pointer */
 765         for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 766                 addr < endstack; addr++, i++) {
 767                 if (*addr & 0x1)
 768                         continue;
 769                 ins_addr = (unsigned short *)*addr;
 770                 ins_addr--;
 771                 if (is_bfin_call(ins_addr))
 772                         fp = addr - 1;
 773
 774                 if (fp) {
 775                         /* Let's check to see if it is a frame pointer */
 776                         while (fp >= (addr - 1) && fp < endstack && fp)
 777                                 fp = (unsigned int *)*fp;
 778                         if (fp == 0 || fp == endstack) {
 779                                 fp = addr - 1;
 780                                 break;
 781                         }
 782                         fp = 0;
 783                 }
 784         }
 785         if (fp) {
 786                 frame = fp;
 787                 printk(" FP: (0x%p)\n", fp);
 788         } else
 789                 frame = 0;
 790
 791         /*
 792          * Now that we think we know where things are, we
 793          * walk the stack again, this time printing things out
 794          * incase there is no frame pointer, we still look for
 795          * valid return addresses
 796          */
 797
 798         /* First time print out data, next time, print out symbols */
 799         for (j = 0; j <= 1; j++) {
 800                 if (j)
 801                         printk(KERN_NOTICE "Return addresses in stack:\n");
 802                 else
 803                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
 804
 805                 fp = frame;
 806                 frame_no = 0;
 807
 808                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 809                      addr <= endstack; addr++, i++) {
 810
 811                         ret_addr = 0;
 812                         if (!j && i % 8 == 0)
 813                                 printk("\n" KERN_NOTICE "%p:",addr);
 814
 815                         /* if it is an odd address, or zero, just skip it */
 816                         if (*addr & 0x1 || !*addr)
 817                                 goto print;
 818
 819                         ins_addr = (unsigned short *)*addr;
 820
 821                         /* Go back one instruction, and see if it is a CALL */
 822                         ins_addr--;
 823                         ret_addr = is_bfin_call(ins_addr);
 824  print:
 825                         if (!j && stack == (unsigned long *)addr)
 826                                 printk("[%08x]", *addr);
 827                         else if (ret_addr)
 828                                 if (j) {
 829                                         decode_address(buf, (unsigned int)*addr);
 830                                         if (frame == addr) {
 831                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
 832                                                 continue;
 833                                         }
 834                                         printk(KERN_NOTICE "    address : %s\n", buf);
 835                                 } else
 836                                         printk("<%08x>", *addr);
 837                         else if (fp == addr) {
 838                                 if (j)
 839                                         frame = addr+1;
 840                                 else
 841                                         printk("(%08x)", *addr);
 842
 843                                 fp = (unsigned int *)*addr;
 844                                 frame_no++;
 845
 846                         } else if (!j)
 847                                 printk(" %08x ", *addr);
 848                 }
 849                 if (!j)
 850                         printk("\n");
 851         }
 852
 853 }
 854
 855 void dump_stack(void)
 856 {
 857         unsigned long stack;
 858 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 859         int tflags;
 860 #endif
 861         trace_buffer_save(tflags);
 862         dump_bfin_trace_buffer();
 863         show_stack(current, &stack);
 864         trace_buffer_restore(tflags);
 865 }
 866 EXPORT_SYMBOL(dump_stack);
 867
 868 void dump_bfin_process(struct pt_regs *fp)
 869 {
 870         /* We should be able to look at fp->ipend, but we don't push it on the
 871          * stack all the time, so do this until we fix that */
 872         unsigned int context = bfin_read_IPEND();
 873
 874         if (oops_in_progress)
 875                 printk(KERN_EMERG "Kernel OOPS in progress\n");
 876
 877         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 878                 printk(KERN_NOTICE "HW Error context\n");
 879         else if (context & 0x0020)
 880                 printk(KERN_NOTICE "Deferred Exception context\n");
 881         else if (context & 0x3FC0)
 882                 printk(KERN_NOTICE "Interrupt context\n");
 883         else if (context & 0x4000)
 884                 printk(KERN_NOTICE "Deferred Interrupt context\n");
 885         else if (context & 0x8000)
 886                 printk(KERN_NOTICE "Kernel process context\n");
 887
 888         /* Because we are crashing, and pointers could be bad, we check things
 889          * pretty closely before we use them
 890          */
 891         if ((unsigned long)current >= FIXED_CODE_START &&
 892             !((unsigned long)current & 0x3) && current->pid) {
 893                 printk(KERN_NOTICE "CURRENT PROCESS:\n");
 894                 if (current->comm >= (char *)FIXED_CODE_START)
 895                         printk(KERN_NOTICE "COMM=%s PID=%d\n",
 896                                 current->comm, current->pid);
 897                 else
 898                         printk(KERN_NOTICE "COMM= invalid\n");
 899
 900                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
 901                         printk(KERN_NOTICE  "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
 902                                 KERN_NOTICE " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n"
 903                                 KERN_NOTICE "\n",
 904                                 (void *)current->mm->start_code,
 905                                 (void *)current->mm->end_code,
 906                                 (void *)current->mm->start_data,
 907                                 (void *)current->mm->end_data,
 908                                 (void *)current->mm->end_data,
 909                                 (void *)current->mm->brk,
 910                                 (void *)current->mm->start_stack);
 911                 else
 912                         printk(KERN_NOTICE "invalid mm\n");
 913         } else
 914                 printk(KERN_NOTICE "\n" KERN_NOTICE
 915                      "No Valid process in current context\n");
 916 }
 917
 918 void dump_bfin_mem(struct pt_regs *fp)
 919 {
 920         unsigned short *addr, *erraddr, val = 0, err = 0;
 921         char sti = 0, buf[6];
 922
 923         erraddr = (void *)fp->pc;
 924
 925         printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
 926
 927         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
 928              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
 929              addr++) {
 930                 if (!((unsigned long)addr & 0xF))
 931                         printk("\n" KERN_NOTICE "0x%p: ", addr);
 932
 933                 if (get_instruction(&val, addr)) {
 934                                 val = 0;
 935                                 sprintf(buf, "????");
 936                 } else
 937                         sprintf(buf, "%04x", val);
 938
 939                 if (addr == erraddr) {
 940                         printk("[%s]", buf);
 941                         err = val;
 942                 } else
 943                         printk(" %s ", buf);
 944
 945                 /* Do any previous instructions turn on interrupts? */
 946                 if (addr <= erraddr &&                          /* in the past */
 947                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
 948                       val == 0x017b))                           /* [SP++] = RETI */
 949                         sti = 1;
 950         }
 951
 952         printk("\n");
 953
 954         /* Hardware error interrupts can be deferred */
 955         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
 956             oops_in_progress)){
 957                 printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
 958 #ifndef CONFIG_DEBUG_HWERR
 959                 printk(KERN_NOTICE "The remaining message may be meaningless\n"
 960                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
 961                          " better idea where it came from\n");
 962 #else
 963                 /* If we are handling only one peripheral interrupt
 964                  * and current mm and pid are valid, and the last error
 965                  * was in that user space process's text area
 966                  * print it out - because that is where the problem exists
 967                  */
 968                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
 969                      (current->pid && current->mm)) {
 970                         /* And the last RETI points to the current userspace context */
 971                         if ((fp + 1)->pc >= current->mm->start_code &&
 972                             (fp + 1)->pc <= current->mm->end_code) {
 973                                 printk(KERN_NOTICE "It might be better to look around here : \n");
 974                                 printk(KERN_NOTICE "-------------------------------------------\n");
 975                                 show_regs(fp + 1);
 976                                 printk(KERN_NOTICE "-------------------------------------------\n");
 977                         }
 978                 }
 979 #endif
 980         }
 981 }
 982
 983 void show_regs(struct pt_regs *fp)
 984 {
 985         char buf [150];
 986         struct irqaction *action;
 987         unsigned int i;
 988         unsigned long flags;
 989
 990         printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
 991         printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
 992                 (long)fp->seqstat, fp->ipend, fp->syscfg);
 993         printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
 994                 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
 995         printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
 996                 fp->seqstat & SEQSTAT_EXCAUSE);
 997         for (i = 6; i <= 15 ; i++) {
 998                 if (fp->ipend & (1 << i)) {
 999                         decode_address(buf, bfin_read32(EVT0 + 4*i));
1000                         printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1001                 }
1002         }
1003
1004         /* if no interrupts are going off, don't print this out */
1005         if (fp->ipend & ~0x3F) {
1006                 for (i = 0; i < (NR_IRQS - 1); i++) {
1007                         spin_lock_irqsave(&irq_desc[i].lock, flags);
1008                         action = irq_desc[i].action;
1009                         if (!action)
1010                                 goto unlock;
1011
1012                         decode_address(buf, (unsigned int)action->handler);
1013                         printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1014                         for (action = action->next; action; action = action->next) {
1015                                 decode_address(buf, (unsigned int)action->handler);
1016                                 printk(", %s", buf);
1017                         }
1018                         printk("\n");
1019 unlock:
1020                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1021                 }
1022         }
1023
1024         decode_address(buf, fp->rete);
1025         printk(KERN_NOTICE " RETE: %s\n", buf);
1026         decode_address(buf, fp->retn);
1027         printk(KERN_NOTICE " RETN: %s\n", buf);
1028         decode_address(buf, fp->retx);
1029         printk(KERN_NOTICE " RETX: %s\n", buf);
1030         decode_address(buf, fp->rets);
1031         printk(KERN_NOTICE " RETS: %s\n", buf);
1032         decode_address(buf, fp->pc);
1033         printk(KERN_NOTICE " PC  : %s\n", buf);
1034
1035         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1036             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1037                 decode_address(buf, saved_dcplb_fault_addr);
1038                 printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1039                 decode_address(buf, saved_icplb_fault_addr);
1040                 printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1041         }
1042
1043         printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
1044         printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1045                 fp->r0, fp->r1, fp->r2, fp->r3);
1046         printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1047                 fp->r4, fp->r5, fp->r6, fp->r7);
1048         printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1049                 fp->p0, fp->p1, fp->p2, fp->p3);
1050         printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1051                 fp->p4, fp->p5, fp->fp, (long)fp);
1052         printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1053                 fp->lb0, fp->lt0, fp->lc0);
1054         printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1055                 fp->lb1, fp->lt1, fp->lc1);
1056         printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1057                 fp->b0, fp->l0, fp->m0, fp->i0);
1058         printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1059                 fp->b1, fp->l1, fp->m1, fp->i1);
1060         printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1061                 fp->b2, fp->l2, fp->m2, fp->i2);
1062         printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1063                 fp->b3, fp->l3, fp->m3, fp->i3);
1064         printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1065                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1066
1067         printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1068                 rdusp(), fp->astat);
1069
1070         printk(KERN_NOTICE "\n");
1071 }
1072
1073 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1074 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1075 #endif
1076
1077 asmlinkage int sys_bfin_spinlock(int *spinlock)
1078 {
1079         int ret = 0;
1080         int tmp = 0;
1081
1082         local_irq_disable();
1083         ret = get_user(tmp, spinlock);
1084         if (ret == 0) {
1085                 if (tmp)
1086                         ret = 1;
1087                 tmp = 1;
1088                 put_user(tmp, spinlock);
1089         }
1090         local_irq_enable();
1091         return ret;
1092 }
1093
1094 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1095 {
1096         void (*curr_handler)(void);
1097
1098         if (exception > 0x3F)
1099                 return -EINVAL;
1100
1101         curr_handler = ex_table[exception];
1102
1103         if (curr_handler != ex_replaceable)
1104                 return -EBUSY;
1105
1106         ex_table[exception] = handler;
1107
1108         return 0;
1109 }
1110 EXPORT_SYMBOL(bfin_request_exception);
1111
1112 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1113 {
1114         void (*curr_handler)(void);
1115
1116         if (exception > 0x3F)
1117                 return -EINVAL;
1118
1119         curr_handler = ex_table[exception];
1120
1121         if (curr_handler != handler)
1122                 return -EBUSY;
1123
1124         ex_table[exception] = ex_replaceable;
1125
1126         return 0;
1127 }
1128 EXPORT_SYMBOL(bfin_free_exception);
1129
1130 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1131 {
1132         switch (cplb_panic) {
1133         case CPLB_NO_UNLOCKED:
1134                 printk(KERN_EMERG "All CPLBs are locked\n");
1135                 break;
1136         case CPLB_PROT_VIOL:
1137                 return;
1138         case CPLB_NO_ADDR_MATCH:
1139                 return;
1140         case CPLB_UNKNOWN_ERR:
1141                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1142                 break;
1143         }
1144
1145         oops_in_progress = 1;
1146
1147         dump_bfin_process(fp);
1148         dump_bfin_mem(fp);
1149         show_regs(fp);
1150         dump_stack();
1151         panic("Unrecoverable event\n");
1152 }