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