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
  44 #ifdef CONFIG_KGDB
  45 # include <linux/kgdb.h>
  46
  47 # define CHK_DEBUGGER_TRAP() \
  48         do { \
  49                 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
  50         } while (0)
  51 # define CHK_DEBUGGER_TRAP_MAYBE() \
  52         do { \
  53                 if (kgdb_connected) \
  54                         CHK_DEBUGGER_TRAP(); \
  55         } while (0)
  56 #else
  57 # define CHK_DEBUGGER_TRAP() do { } while (0)
  58 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  59 #endif
  60
  61
  62 #ifdef CONFIG_VERBOSE_DEBUG
  63 #define verbose_printk(fmt, arg...) \
  64         printk(fmt, ##arg)
  65 #else
  66 #define verbose_printk(fmt, arg...) \
  67         ({ if (0) printk(fmt, ##arg); 0; })
  68 #endif
  69
  70 /* Initiate the event table handler */
  71 void __init trap_init(void)
  72 {
  73         CSYNC();
  74         bfin_write_EVT3(trap);
  75         CSYNC();
  76 }
  77
  78 /*
  79  * Used to save the RETX, SEQSTAT, I/D CPLB FAULT ADDR
  80  * values across the transition from exception to IRQ5.
  81  * We put these in L1, so they are going to be in a valid
  82  * location during exception context
  83  */
  84 __attribute__((l1_data))
  85 unsigned long saved_retx, saved_seqstat,
  86         saved_icplb_fault_addr, saved_dcplb_fault_addr;
  87
  88 static void decode_address(char *buf, unsigned long address)
  89 {
  90 #ifdef CONFIG_DEBUG_VERBOSE
  91         struct vm_list_struct *vml;
  92         struct task_struct *p;
  93         struct mm_struct *mm;
  94         unsigned long flags, offset;
  95         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
  96
  97 #ifdef CONFIG_KALLSYMS
  98         unsigned long symsize;
  99         const char *symname;
 100         char *modname;
 101         char *delim = ":";
 102         char namebuf[128];
 103
 104         /* look up the address and see if we are in kernel space */
 105         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
 106
 107         if (symname) {
 108                 /* yeah! kernel space! */
 109                 if (!modname)
 110                         modname = delim = "";
 111                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
 112                               (void *)address, delim, modname, delim, symname,
 113                               (unsigned long)offset);
 114                 return;
 115
 116         }
 117 #endif
 118
 119         /* Problem in fixed code section? */
 120         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 121                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
 122                 return;
 123         }
 124
 125         /* Problem somewhere before the kernel start address */
 126         if (address < CONFIG_BOOT_LOAD) {
 127                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
 128                 return;
 129         }
 130
 131         /* looks like we're off in user-land, so let's walk all the
 132          * mappings of all our processes and see if we can't be a whee
 133          * bit more specific
 134          */
 135         write_lock_irqsave(&tasklist_lock, flags);
 136         for_each_process(p) {
 137                 mm = (in_atomic ? p->mm : get_task_mm(p));
 138                 if (!mm)
 139                         continue;
 140
 141                 vml = mm->context.vmlist;
 142                 while (vml) {
 143                         struct vm_area_struct *vma = vml->vma;
 144
 145                         if (address >= vma->vm_start && address < vma->vm_end) {
 146                                 char _tmpbuf[256];
 147                                 char *name = p->comm;
 148                                 struct file *file = vma->vm_file;
 149
 150                                 if (file)
 151                                         name = d_path(&file->f_path, _tmpbuf,
 152                                                       sizeof(_tmpbuf));
 153
 154                                 /* FLAT does not have its text aligned to the start of
 155                                  * the map while FDPIC ELF does ...
 156                                  */
 157
 158                                 /* before we can check flat/fdpic, we need to
 159                                  * make sure current is valid
 160                                  */
 161                                 if ((unsigned long)current >= FIXED_CODE_START &&
 162                                     !((unsigned long)current & 0x3)) {
 163                                         if (current->mm &&
 164                                             (address > current->mm->start_code) &&
 165                                             (address < current->mm->end_code))
 166                                                 offset = address - current->mm->start_code;
 167                                         else
 168                                                 offset = (address - vma->vm_start) +
 169                                                          (vma->vm_pgoff << PAGE_SHIFT);
 170
 171                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 172                                                 (void *)address, name, offset);
 173                                 } else
 174                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
 175                                                 (void *)address, name,
 176                                                 vma->vm_start, vma->vm_end);
 177
 178                                 if (!in_atomic)
 179                                         mmput(mm);
 180
 181                                 if (!strlen(buf))
 182                                         sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
 183
 184                                 goto done;
 185                         }
 186
 187                         vml = vml->next;
 188                 }
 189                 if (!in_atomic)
 190                         mmput(mm);
 191         }
 192
 193         /* we were unable to find this address anywhere */
 194         sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
 195
 196 done:
 197         write_unlock_irqrestore(&tasklist_lock, flags);
 198 #else
 199         sprintf(buf, " ");
 200 #endif
 201 }
 202
 203 asmlinkage void double_fault_c(struct pt_regs *fp)
 204 {
 205         console_verbose();
 206         oops_in_progress = 1;
 207 #ifdef CONFIG_DEBUG_VERBOSE
 208         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 209 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 210         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 211                 char buf[150];
 212                 decode_address(buf, saved_retx);
 213                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 214                         (int)saved_seqstat & SEQSTAT_EXCAUSE, buf);
 215                 decode_address(buf, saved_dcplb_fault_addr);
 216                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 217                 decode_address(buf, saved_icplb_fault_addr);
 218                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 219
 220                 decode_address(buf, fp->retx);
 221                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n",
 222                         buf);
 223         } else
 224 #endif
 225         {
 226                 dump_bfin_process(fp);
 227                 dump_bfin_mem(fp);
 228                 show_regs(fp);
 229         }
 230 #endif
 231         panic("Double Fault - unrecoverable event\n");
 232
 233 }
 234
 235 asmlinkage void trap_c(struct pt_regs *fp)
 236 {
 237 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 238         int j;
 239 #endif
 240         int sig = 0;
 241         siginfo_t info;
 242         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 243
 244         trace_buffer_save(j);
 245
 246         /* Important - be very careful dereferncing pointers - will lead to
 247          * double faults if the stack has become corrupt
 248          */
 249
 250         /* If the fault was caused by a kernel thread, or interrupt handler
 251          * we will kernel panic, so the system reboots.
 252          * If KGDB is enabled, don't set this for kernel breakpoints
 253         */
 254
 255         /* TODO: check to see if we are in some sort of deferred HWERR
 256          * that we should be able to recover from, not kernel panic
 257          */
 258         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
 259 #ifdef CONFIG_KGDB
 260                 && (trapnr != VEC_EXCPT02)
 261 #endif
 262         ){
 263                 console_verbose();
 264                 oops_in_progress = 1;
 265         } else if (current) {
 266                 if (current->mm == NULL) {
 267                         console_verbose();
 268                         oops_in_progress = 1;
 269                 }
 270         }
 271
 272         /* trap_c() will be called for exceptions. During exceptions
 273          * processing, the pc value should be set with retx value.
 274          * With this change we can cleanup some code in signal.c- TODO
 275          */
 276         fp->orig_pc = fp->retx;
 277         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 278                 trapnr, fp->ipend, fp->pc, fp->retx); */
 279
 280         /* send the appropriate signal to the user program */
 281         switch (trapnr) {
 282
 283         /* This table works in conjuction with the one in ./mach-common/entry.S
 284          * Some exceptions are handled there (in assembly, in exception space)
 285          * Some are handled here, (in C, in interrupt space)
 286          * Some, like CPLB, are handled in both, where the normal path is
 287          * handled in assembly/exception space, and the error path is handled
 288          * here
 289          */
 290
 291         /* 0x00 - Linux Syscall, getting here is an error */
 292         /* 0x01 - userspace gdb breakpoint, handled here */
 293         case VEC_EXCPT01:
 294                 info.si_code = TRAP_ILLTRAP;
 295                 sig = SIGTRAP;
 296                 CHK_DEBUGGER_TRAP_MAYBE();
 297                 /* Check if this is a breakpoint in kernel space */
 298                 if (fp->ipend & 0xffc0)
 299                         return;
 300                 else
 301                         break;
 302         /* 0x03 - User Defined, userspace stack overflow */
 303         case VEC_EXCPT03:
 304                 info.si_code = SEGV_STACKFLOW;
 305                 sig = SIGSEGV;
 306                 verbose_printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
 307                 CHK_DEBUGGER_TRAP_MAYBE();
 308                 break;
 309         /* 0x02 - KGDB initial connection and break signal trap */
 310         case VEC_EXCPT02:
 311 #ifdef CONFIG_KGDB
 312                 info.si_code = TRAP_ILLTRAP;
 313                 sig = SIGTRAP;
 314                 CHK_DEBUGGER_TRAP();
 315                 return;
 316 #endif
 317         /* 0x04 - User Defined */
 318         /* 0x05 - User Defined */
 319         /* 0x06 - User Defined */
 320         /* 0x07 - User Defined */
 321         /* 0x08 - User Defined */
 322         /* 0x09 - User Defined */
 323         /* 0x0A - User Defined */
 324         /* 0x0B - User Defined */
 325         /* 0x0C - User Defined */
 326         /* 0x0D - User Defined */
 327         /* 0x0E - User Defined */
 328         /* 0x0F - User Defined */
 329         /* If we got here, it is most likely that someone was trying to use a
 330          * custom exception handler, and it is not actually installed properly
 331          */
 332         case VEC_EXCPT04 ... VEC_EXCPT15:
 333                 info.si_code = ILL_ILLPARAOP;
 334                 sig = SIGILL;
 335                 verbose_printk(KERN_NOTICE EXC_0x04(KERN_NOTICE));
 336                 CHK_DEBUGGER_TRAP_MAYBE();
 337                 break;
 338         /* 0x10 HW Single step, handled here */
 339         case VEC_STEP:
 340                 info.si_code = TRAP_STEP;
 341                 sig = SIGTRAP;
 342                 CHK_DEBUGGER_TRAP_MAYBE();
 343                 /* Check if this is a single step in kernel space */
 344                 if (fp->ipend & 0xffc0)
 345                         return;
 346                 else
 347                         break;
 348         /* 0x11 - Trace Buffer Full, handled here */
 349         case VEC_OVFLOW:
 350                 info.si_code = TRAP_TRACEFLOW;
 351                 sig = SIGTRAP;
 352                 verbose_printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
 353                 CHK_DEBUGGER_TRAP_MAYBE();
 354                 break;
 355         /* 0x12 - Reserved, Caught by default */
 356         /* 0x13 - Reserved, Caught by default */
 357         /* 0x14 - Reserved, Caught by default */
 358         /* 0x15 - Reserved, Caught by default */
 359         /* 0x16 - Reserved, Caught by default */
 360         /* 0x17 - Reserved, Caught by default */
 361         /* 0x18 - Reserved, Caught by default */
 362         /* 0x19 - Reserved, Caught by default */
 363         /* 0x1A - Reserved, Caught by default */
 364         /* 0x1B - Reserved, Caught by default */
 365         /* 0x1C - Reserved, Caught by default */
 366         /* 0x1D - Reserved, Caught by default */
 367         /* 0x1E - Reserved, Caught by default */
 368         /* 0x1F - Reserved, Caught by default */
 369         /* 0x20 - Reserved, Caught by default */
 370         /* 0x21 - Undefined Instruction, handled here */
 371         case VEC_UNDEF_I:
 372                 info.si_code = ILL_ILLOPC;
 373                 sig = SIGILL;
 374                 verbose_printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
 375                 CHK_DEBUGGER_TRAP_MAYBE();
 376                 break;
 377         /* 0x22 - Illegal Instruction Combination, handled here */
 378         case VEC_ILGAL_I:
 379                 info.si_code = ILL_ILLPARAOP;
 380                 sig = SIGILL;
 381                 verbose_printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
 382                 CHK_DEBUGGER_TRAP_MAYBE();
 383                 break;
 384         /* 0x23 - Data CPLB protection violation, handled here */
 385         case VEC_CPLB_VL:
 386                 info.si_code = ILL_CPLB_VI;
 387                 sig = SIGBUS;
 388                 verbose_printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
 389                 CHK_DEBUGGER_TRAP_MAYBE();
 390                 break;
 391         /* 0x24 - Data access misaligned, handled here */
 392         case VEC_MISALI_D:
 393                 info.si_code = BUS_ADRALN;
 394                 sig = SIGBUS;
 395                 verbose_printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
 396                 CHK_DEBUGGER_TRAP_MAYBE();
 397                 break;
 398         /* 0x25 - Unrecoverable Event, handled here */
 399         case VEC_UNCOV:
 400                 info.si_code = ILL_ILLEXCPT;
 401                 sig = SIGILL;
 402                 verbose_printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
 403                 CHK_DEBUGGER_TRAP_MAYBE();
 404                 break;
 405         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 406                 error case is handled here */
 407         case VEC_CPLB_M:
 408                 info.si_code = BUS_ADRALN;
 409                 sig = SIGBUS;
 410                 verbose_printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
 411                 break;
 412         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 413         case VEC_CPLB_MHIT:
 414                 info.si_code = ILL_CPLB_MULHIT;
 415                 sig = SIGSEGV;
 416 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 417                 if (saved_dcplb_fault_addr < FIXED_CODE_START)
 418                         verbose_printk(KERN_NOTICE "NULL pointer access\n");
 419                 else
 420 #endif
 421                         verbose_printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
 422                 CHK_DEBUGGER_TRAP_MAYBE();
 423                 break;
 424         /* 0x28 - Emulation Watchpoint, handled here */
 425         case VEC_WATCH:
 426                 info.si_code = TRAP_WATCHPT;
 427                 sig = SIGTRAP;
 428                 pr_debug(EXC_0x28(KERN_DEBUG));
 429                 CHK_DEBUGGER_TRAP_MAYBE();
 430                 /* Check if this is a watchpoint in kernel space */
 431                 if (fp->ipend & 0xffc0)
 432                         return;
 433                 else
 434                         break;
 435 #ifdef CONFIG_BF535
 436         /* 0x29 - Instruction fetch access error (535 only) */
 437         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 438                 info.si_code = BUS_OPFETCH;
 439                 sig = SIGBUS;
 440                 verbose_printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 441                 CHK_DEBUGGER_TRAP_MAYBE();
 442                 break;
 443 #else
 444         /* 0x29 - Reserved, Caught by default */
 445 #endif
 446         /* 0x2A - Instruction fetch misaligned, handled here */
 447         case VEC_MISALI_I:
 448                 info.si_code = BUS_ADRALN;
 449                 sig = SIGBUS;
 450                 verbose_printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
 451                 CHK_DEBUGGER_TRAP_MAYBE();
 452                 break;
 453         /* 0x2B - Instruction CPLB protection violation, handled here */
 454         case VEC_CPLB_I_VL:
 455                 info.si_code = ILL_CPLB_VI;
 456                 sig = SIGBUS;
 457                 verbose_printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
 458                 CHK_DEBUGGER_TRAP_MAYBE();
 459                 break;
 460         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 461         case VEC_CPLB_I_M:
 462                 info.si_code = ILL_CPLB_MISS;
 463                 sig = SIGBUS;
 464                 verbose_printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
 465                 break;
 466         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 467         case VEC_CPLB_I_MHIT:
 468                 info.si_code = ILL_CPLB_MULHIT;
 469                 sig = SIGSEGV;
 470 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 471                 if (saved_icplb_fault_addr < FIXED_CODE_START)
 472                         verbose_printk(KERN_NOTICE "Jump to NULL address\n");
 473                 else
 474 #endif
 475                         verbose_printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
 476                 CHK_DEBUGGER_TRAP_MAYBE();
 477                 break;
 478         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 479         case VEC_ILL_RES:
 480                 info.si_code = ILL_PRVOPC;
 481                 sig = SIGILL;
 482                 verbose_printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
 483                 CHK_DEBUGGER_TRAP_MAYBE();
 484                 break;
 485         /* 0x2F - Reserved, Caught by default */
 486         /* 0x30 - Reserved, Caught by default */
 487         /* 0x31 - Reserved, Caught by default */
 488         /* 0x32 - Reserved, Caught by default */
 489         /* 0x33 - Reserved, Caught by default */
 490         /* 0x34 - Reserved, Caught by default */
 491         /* 0x35 - Reserved, Caught by default */
 492         /* 0x36 - Reserved, Caught by default */
 493         /* 0x37 - Reserved, Caught by default */
 494         /* 0x38 - Reserved, Caught by default */
 495         /* 0x39 - Reserved, Caught by default */
 496         /* 0x3A - Reserved, Caught by default */
 497         /* 0x3B - Reserved, Caught by default */
 498         /* 0x3C - Reserved, Caught by default */
 499         /* 0x3D - Reserved, Caught by default */
 500         /* 0x3E - Reserved, Caught by default */
 501         /* 0x3F - Reserved, Caught by default */
 502         case VEC_HWERR:
 503                 info.si_code = BUS_ADRALN;
 504                 sig = SIGBUS;
 505                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 506                 /* System MMR Error */
 507                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 508                         info.si_code = BUS_ADRALN;
 509                         sig = SIGBUS;
 510                         verbose_printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
 511                         break;
 512                 /* External Memory Addressing Error */
 513                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 514                         info.si_code = BUS_ADRERR;
 515                         sig = SIGBUS;
 516                         verbose_printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
 517                         break;
 518                 /* Performance Monitor Overflow */
 519                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 520                         verbose_printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
 521                         break;
 522                 /* RAISE 5 instruction */
 523                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 524                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 525                         break;
 526                 default:        /* Reserved */
 527                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 528                         break;
 529                 }
 530                 CHK_DEBUGGER_TRAP_MAYBE();
 531                 break;
 532         /*
 533          * We should be handling all known exception types above,
 534          * if we get here we hit a reserved one, so panic
 535          */
 536         default:
 537                 oops_in_progress = 1;
 538                 info.si_code = ILL_ILLPARAOP;
 539                 sig = SIGILL;
 540                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 541                         (fp->seqstat & SEQSTAT_EXCAUSE));
 542                 CHK_DEBUGGER_TRAP_MAYBE();
 543                 break;
 544         }
 545
 546         BUG_ON(sig == 0);
 547
 548         if (sig != SIGTRAP) {
 549                 dump_bfin_process(fp);
 550                 dump_bfin_mem(fp);
 551                 show_regs(fp);
 552
 553                 /* Print out the trace buffer if it makes sense */
 554 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 555                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 556                         verbose_printk(KERN_NOTICE "No trace since you do not have "
 557                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 558                                 KERN_NOTICE "\n");
 559                 else
 560 #endif
 561                         dump_bfin_trace_buffer();
 562
 563                 if (oops_in_progress) {
 564                         /* Dump the current kernel stack */
 565                         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "Kernel Stack\n");
 566                         show_stack(current, NULL);
 567                         print_modules();
 568 #ifndef CONFIG_ACCESS_CHECK
 569                         verbose_printk(KERN_EMERG "Please turn on "
 570                                "CONFIG_ACCESS_CHECK\n");
 571 #endif
 572                         panic("Kernel exception");
 573                 } else {
 574 #ifdef CONFIG_VERBOSE_DEBUG
 575                         unsigned long *stack;
 576                         /* Dump the user space stack */
 577                         stack = (unsigned long *)rdusp();
 578                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
 579                         show_stack(NULL, stack);
 580 #endif
 581                 }
 582         }
 583
 584         info.si_signo = sig;
 585         info.si_errno = 0;
 586         info.si_addr = (void __user *)fp->pc;
 587         force_sig_info(sig, &info, current);
 588
 589         trace_buffer_restore(j);
 590         return;
 591 }
 592
 593 /* Typical exception handling routines  */
 594
 595 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 596
 597 /*
 598  * Similar to get_user, do some address checking, then dereference
 599  * Return true on sucess, false on bad address
 600  */
 601 static bool get_instruction(unsigned short *val, unsigned short *address)
 602 {
 603
 604         unsigned long addr;
 605
 606         addr = (unsigned long)address;
 607
 608         /* Check for odd addresses */
 609         if (addr & 0x1)
 610                 return false;
 611
 612         /* Check that things do not wrap around */
 613         if (addr > (addr + 2))
 614                 return false;
 615
 616         /*
 617          * Since we are in exception context, we need to do a little address checking
 618          * We need to make sure we are only accessing valid memory, and
 619          * we don't read something in the async space that can hang forever
 620          */
 621         if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
 622 #if L2_LENGTH != 0
 623             (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
 624 #endif
 625             (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||
 626 #if L1_DATA_A_LENGTH != 0
 627             (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) ||
 628 #endif
 629 #if L1_DATA_B_LENGTH != 0
 630             (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) ||
 631 #endif
 632             (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) ||
 633             (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) &&
 634                addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) ||
 635             (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) &&
 636                addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) ||
 637             (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) &&
 638                addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) ||
 639             (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) &&
 640               addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) {
 641                 *val = *address;
 642                 return true;
 643         }
 644
 645 #if L1_CODE_LENGTH != 0
 646         if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) {
 647                 isram_memcpy(val, address, 2);
 648                 return true;
 649         }
 650 #endif
 651
 652
 653         return false;
 654 }
 655
 656 /*
 657  * decode the instruction if we are printing out the trace, as it
 658  * makes things easier to follow, without running it through objdump
 659  * These are the normal instructions which cause change of flow, which
 660  * would be at the source of the trace buffer
 661  */
 662 #ifdef CONFIG_DEBUG_VERBOSE
 663 static void decode_instruction(unsigned short *address)
 664 {
 665         unsigned short opcode;
 666
 667         if (get_instruction(&opcode, address)) {
 668                 if (opcode == 0x0010)
 669                         verbose_printk("RTS");
 670                 else if (opcode == 0x0011)
 671                         verbose_printk("RTI");
 672                 else if (opcode == 0x0012)
 673                         verbose_printk("RTX");
 674                 else if (opcode >= 0x0050 && opcode <= 0x0057)
 675                         verbose_printk("JUMP (P%i)", opcode & 7);
 676                 else if (opcode >= 0x0060 && opcode <= 0x0067)
 677                         verbose_printk("CALL (P%i)", opcode & 7);
 678                 else if (opcode >= 0x0070 && opcode <= 0x0077)
 679                         verbose_printk("CALL (PC+P%i)", opcode & 7);
 680                 else if (opcode >= 0x0080 && opcode <= 0x0087)
 681                         verbose_printk("JUMP (PC+P%i)", opcode & 7);
 682                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
 683                         verbose_printk("IF !CC JUMP");
 684                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
 685                         verbose_printk("IF CC JUMP");
 686                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
 687                         verbose_printk("JUMP.S");
 688                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
 689                         verbose_printk("LSETUP");
 690                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
 691                         verbose_printk("JUMP.L");
 692                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
 693                         verbose_printk("CALL pcrel");
 694                 else
 695                         verbose_printk("0x%04x", opcode);
 696         }
 697
 698 }
 699 #endif
 700
 701 void dump_bfin_trace_buffer(void)
 702 {
 703 #ifdef CONFIG_DEBUG_VERBOSE
 704 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 705         int tflags, i = 0;
 706         char buf[150];
 707         unsigned short *addr;
 708 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 709         int j, index;
 710 #endif
 711
 712         trace_buffer_save(tflags);
 713
 714         printk(KERN_NOTICE "Hardware Trace:\n");
 715
 716 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 717         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
 718 #endif
 719
 720         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 721                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 722                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 723                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 724                         addr = (unsigned short *)bfin_read_TBUF();
 725                         decode_address(buf, (unsigned long)addr);
 726                         printk(KERN_NOTICE "     Source : %s ", buf);
 727                         decode_instruction(addr);
 728                         printk("\n");
 729                 }
 730         }
 731
 732 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 733         if (trace_buff_offset)
 734                 index = trace_buff_offset / 4;
 735         else
 736                 index = EXPAND_LEN;
 737
 738         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 739         while (j) {
 740                 decode_address(buf, software_trace_buff[index]);
 741                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 742                 index -= 1;
 743                 if (index < 0 )
 744                         index = EXPAND_LEN;
 745                 decode_address(buf, software_trace_buff[index]);
 746                 printk(KERN_NOTICE "     Source : %s ", buf);
 747                 decode_instruction((unsigned short *)software_trace_buff[index]);
 748                 printk("\n");
 749                 index -= 1;
 750                 if (index < 0)
 751                         index = EXPAND_LEN;
 752                 j--;
 753                 i++;
 754         }
 755 #endif
 756
 757         trace_buffer_restore(tflags);
 758 #endif
 759 #endif
 760 }
 761 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 762
 763 /*
 764  * Checks to see if the address pointed to is either a
 765  * 16-bit CALL instruction, or a 32-bit CALL instruction
 766  */
 767 static bool is_bfin_call(unsigned short *addr)
 768 {
 769         unsigned short opcode = 0, *ins_addr;
 770         ins_addr = (unsigned short *)addr;
 771
 772         if (!get_instruction(&opcode, ins_addr))
 773                 return false;
 774
 775         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
 776             (opcode >= 0x0070 && opcode <= 0x0077))
 777                 return true;
 778
 779         ins_addr--;
 780         if (!get_instruction(&opcode, ins_addr))
 781                 return false;
 782
 783         if (opcode >= 0xE300 && opcode <= 0xE3FF)
 784                 return true;
 785
 786         return false;
 787
 788 }
 789
 790 void show_stack(struct task_struct *task, unsigned long *stack)
 791 {
 792 #ifdef CONFIG_PRINTK
 793         unsigned int *addr, *endstack, *fp = 0, *frame;
 794         unsigned short *ins_addr;
 795         char buf[150];
 796         unsigned int i, j, ret_addr, frame_no = 0;
 797
 798         /*
 799          * If we have been passed a specific stack, use that one otherwise
 800          *    if we have been passed a task structure, use that, otherwise
 801          *    use the stack of where the variable "stack" exists
 802          */
 803
 804         if (stack == NULL) {
 805                 if (task) {
 806                         /* We know this is a kernel stack, so this is the start/end */
 807                         stack = (unsigned long *)task->thread.ksp;
 808                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
 809                 } else {
 810                         /* print out the existing stack info */
 811                         stack = (unsigned long *)&stack;
 812                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 813                 }
 814         } else
 815                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 816
 817         printk(KERN_NOTICE "Stack info:\n");
 818         decode_address(buf, (unsigned int)stack);
 819         printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
 820
 821         addr = (unsigned int *)((unsigned int)stack & ~0x3F);
 822
 823         /* First thing is to look for a frame pointer */
 824         for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 825                 addr < endstack; addr++, i++) {
 826                 if (*addr & 0x1)
 827                         continue;
 828                 ins_addr = (unsigned short *)*addr;
 829                 ins_addr--;
 830                 if (is_bfin_call(ins_addr))
 831                         fp = addr - 1;
 832
 833                 if (fp) {
 834                         /* Let's check to see if it is a frame pointer */
 835                         while (fp >= (addr - 1) && fp < endstack && fp)
 836                                 fp = (unsigned int *)*fp;
 837                         if (fp == 0 || fp == endstack) {
 838                                 fp = addr - 1;
 839                                 break;
 840                         }
 841                         fp = 0;
 842                 }
 843         }
 844         if (fp) {
 845                 frame = fp;
 846                 printk(" FP: (0x%p)\n", fp);
 847         } else
 848                 frame = 0;
 849
 850         /*
 851          * Now that we think we know where things are, we
 852          * walk the stack again, this time printing things out
 853          * incase there is no frame pointer, we still look for
 854          * valid return addresses
 855          */
 856
 857         /* First time print out data, next time, print out symbols */
 858         for (j = 0; j <= 1; j++) {
 859                 if (j)
 860                         printk(KERN_NOTICE "Return addresses in stack:\n");
 861                 else
 862                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
 863
 864                 fp = frame;
 865                 frame_no = 0;
 866
 867                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 868                      addr <= endstack; addr++, i++) {
 869
 870                         ret_addr = 0;
 871                         if (!j && i % 8 == 0)
 872                                 printk("\n" KERN_NOTICE "%p:",addr);
 873
 874                         /* if it is an odd address, or zero, just skip it */
 875                         if (*addr & 0x1 || !*addr)
 876                                 goto print;
 877
 878                         ins_addr = (unsigned short *)*addr;
 879
 880                         /* Go back one instruction, and see if it is a CALL */
 881                         ins_addr--;
 882                         ret_addr = is_bfin_call(ins_addr);
 883  print:
 884                         if (!j && stack == (unsigned long *)addr)
 885                                 printk("[%08x]", *addr);
 886                         else if (ret_addr)
 887                                 if (j) {
 888                                         decode_address(buf, (unsigned int)*addr);
 889                                         if (frame == addr) {
 890                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
 891                                                 continue;
 892                                         }
 893                                         printk(KERN_NOTICE "    address : %s\n", buf);
 894                                 } else
 895                                         printk("<%08x>", *addr);
 896                         else if (fp == addr) {
 897                                 if (j)
 898                                         frame = addr+1;
 899                                 else
 900                                         printk("(%08x)", *addr);
 901
 902                                 fp = (unsigned int *)*addr;
 903                                 frame_no++;
 904
 905                         } else if (!j)
 906                                 printk(" %08x ", *addr);
 907                 }
 908                 if (!j)
 909                         printk("\n");
 910         }
 911 #endif
 912 }
 913
 914 void dump_stack(void)
 915 {
 916         unsigned long stack;
 917 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 918         int tflags;
 919 #endif
 920         trace_buffer_save(tflags);
 921         dump_bfin_trace_buffer();
 922         show_stack(current, &stack);
 923         trace_buffer_restore(tflags);
 924 }
 925 EXPORT_SYMBOL(dump_stack);
 926
 927 void dump_bfin_process(struct pt_regs *fp)
 928 {
 929 #ifdef CONFIG_DEBUG_VERBOSE
 930         /* We should be able to look at fp->ipend, but we don't push it on the
 931          * stack all the time, so do this until we fix that */
 932         unsigned int context = bfin_read_IPEND();
 933
 934         if (oops_in_progress)
 935                 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
 936
 937         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 938                 verbose_printk(KERN_NOTICE "HW Error context\n");
 939         else if (context & 0x0020)
 940                 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
 941         else if (context & 0x3FC0)
 942                 verbose_printk(KERN_NOTICE "Interrupt context\n");
 943         else if (context & 0x4000)
 944                 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
 945         else if (context & 0x8000)
 946                 verbose_printk(KERN_NOTICE "Kernel process context\n");
 947
 948         /* Because we are crashing, and pointers could be bad, we check things
 949          * pretty closely before we use them
 950          */
 951         if ((unsigned long)current >= FIXED_CODE_START &&
 952             !((unsigned long)current & 0x3) && current->pid) {
 953                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
 954                 if (current->comm >= (char *)FIXED_CODE_START)
 955                         verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
 956                                 current->comm, current->pid);
 957                 else
 958                         verbose_printk(KERN_NOTICE "COMM= invalid\n");
 959
 960                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
 961                         verbose_printk(KERN_NOTICE  "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
 962                                 KERN_NOTICE " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n"
 963                                 KERN_NOTICE "\n",
 964                                 (void *)current->mm->start_code,
 965                                 (void *)current->mm->end_code,
 966                                 (void *)current->mm->start_data,
 967                                 (void *)current->mm->end_data,
 968                                 (void *)current->mm->end_data,
 969                                 (void *)current->mm->brk,
 970                                 (void *)current->mm->start_stack);
 971                 else
 972                         verbose_printk(KERN_NOTICE "invalid mm\n");
 973         } else
 974                 verbose_printk(KERN_NOTICE "\n" KERN_NOTICE
 975                      "No Valid process in current context\n");
 976 #endif
 977 }
 978
 979 void dump_bfin_mem(struct pt_regs *fp)
 980 {
 981 #ifdef CONFIG_DEBUG_VERBOSE
 982         unsigned short *addr, *erraddr, val = 0, err = 0;
 983         char sti = 0, buf[6];
 984
 985         erraddr = (void *)fp->pc;
 986
 987         verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
 988
 989         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
 990              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
 991              addr++) {
 992                 if (!((unsigned long)addr & 0xF))
 993                         verbose_printk("\n" KERN_NOTICE "0x%p: ", addr);
 994
 995                 if (!get_instruction(&val, addr)) {
 996                                 val = 0;
 997                                 sprintf(buf, "????");
 998                 } else
 999                         sprintf(buf, "%04x", val);
1000
1001                 if (addr == erraddr) {
1002                         verbose_printk("[%s]", buf);
1003                         err = val;
1004                 } else
1005                         verbose_printk(" %s ", buf);
1006
1007                 /* Do any previous instructions turn on interrupts? */
1008                 if (addr <= erraddr &&                          /* in the past */
1009                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
1010                       val == 0x017b))                           /* [SP++] = RETI */
1011                         sti = 1;
1012         }
1013
1014         verbose_printk("\n");
1015
1016         /* Hardware error interrupts can be deferred */
1017         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1018             oops_in_progress)){
1019                 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1020 #ifndef CONFIG_DEBUG_HWERR
1021                 verbose_printk(KERN_NOTICE "The remaining message may be meaningless\n"
1022                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
1023                          " better idea where it came from\n");
1024 #else
1025                 /* If we are handling only one peripheral interrupt
1026                  * and current mm and pid are valid, and the last error
1027                  * was in that user space process's text area
1028                  * print it out - because that is where the problem exists
1029                  */
1030                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1031                      (current->pid && current->mm)) {
1032                         /* And the last RETI points to the current userspace context */
1033                         if ((fp + 1)->pc >= current->mm->start_code &&
1034                             (fp + 1)->pc <= current->mm->end_code) {
1035                                 verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
1036                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1037                                 show_regs(fp + 1);
1038                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1039                         }
1040                 }
1041 #endif
1042         }
1043 #endif
1044 }
1045
1046 void show_regs(struct pt_regs *fp)
1047 {
1048 #ifdef CONFIG_DEBUG_VERBOSE
1049         char buf [150];
1050         struct irqaction *action;
1051         unsigned int i;
1052         unsigned long flags;
1053
1054         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
1055         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
1056                 (long)fp->seqstat, fp->ipend, fp->syscfg);
1057         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1058                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1059                         (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1060 #ifdef EBIU_ERRMST
1061                 /* If the error was from the EBIU, print it out */
1062                 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1063                         verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
1064                                 bfin_read_EBIU_ERRMST());
1065                         verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
1066                                 bfin_read_EBIU_ERRADD());
1067                 }
1068 #endif
1069         }
1070         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1071                 fp->seqstat & SEQSTAT_EXCAUSE);
1072         for (i = 6; i <= 15 ; i++) {
1073                 if (fp->ipend & (1 << i)) {
1074                         decode_address(buf, bfin_read32(EVT0 + 4*i));
1075                         verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1076                 }
1077         }
1078
1079         /* if no interrupts are going off, don't print this out */
1080         if (fp->ipend & ~0x3F) {
1081                 for (i = 0; i < (NR_IRQS - 1); i++) {
1082                         spin_lock_irqsave(&irq_desc[i].lock, flags);
1083                         action = irq_desc[i].action;
1084                         if (!action)
1085                                 goto unlock;
1086
1087                         decode_address(buf, (unsigned int)action->handler);
1088                         verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1089                         for (action = action->next; action; action = action->next) {
1090                                 decode_address(buf, (unsigned int)action->handler);
1091                                 verbose_printk(", %s", buf);
1092                         }
1093                         verbose_printk("\n");
1094 unlock:
1095                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1096                 }
1097         }
1098
1099         decode_address(buf, fp->rete);
1100         verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1101         decode_address(buf, fp->retn);
1102         verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1103         decode_address(buf, fp->retx);
1104         verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1105         decode_address(buf, fp->rets);
1106         verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1107         decode_address(buf, fp->pc);
1108         verbose_printk(KERN_NOTICE " PC  : %s\n", buf);
1109
1110         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1111             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1112                 decode_address(buf, saved_dcplb_fault_addr);
1113                 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1114                 decode_address(buf, saved_icplb_fault_addr);
1115                 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1116         }
1117
1118         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
1119         verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1120                 fp->r0, fp->r1, fp->r2, fp->r3);
1121         verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1122                 fp->r4, fp->r5, fp->r6, fp->r7);
1123         verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1124                 fp->p0, fp->p1, fp->p2, fp->p3);
1125         verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1126                 fp->p4, fp->p5, fp->fp, (long)fp);
1127         verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1128                 fp->lb0, fp->lt0, fp->lc0);
1129         verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1130                 fp->lb1, fp->lt1, fp->lc1);
1131         verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1132                 fp->b0, fp->l0, fp->m0, fp->i0);
1133         verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1134                 fp->b1, fp->l1, fp->m1, fp->i1);
1135         verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1136                 fp->b2, fp->l2, fp->m2, fp->i2);
1137         verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1138                 fp->b3, fp->l3, fp->m3, fp->i3);
1139         verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1140                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1141
1142         verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1143                 rdusp(), fp->astat);
1144
1145         verbose_printk(KERN_NOTICE "\n");
1146 #endif
1147 }
1148
1149 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1150 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1151 #endif
1152
1153 asmlinkage int sys_bfin_spinlock(int *spinlock)
1154 {
1155         int ret = 0;
1156         int tmp = 0;
1157
1158         local_irq_disable();
1159         ret = get_user(tmp, spinlock);
1160         if (ret == 0) {
1161                 if (tmp)
1162                         ret = 1;
1163                 tmp = 1;
1164                 put_user(tmp, spinlock);
1165         }
1166         local_irq_enable();
1167         return ret;
1168 }
1169
1170 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1171 {
1172         void (*curr_handler)(void);
1173
1174         if (exception > 0x3F)
1175                 return -EINVAL;
1176
1177         curr_handler = ex_table[exception];
1178
1179         if (curr_handler != ex_replaceable)
1180                 return -EBUSY;
1181
1182         ex_table[exception] = handler;
1183
1184         return 0;
1185 }
1186 EXPORT_SYMBOL(bfin_request_exception);
1187
1188 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1189 {
1190         void (*curr_handler)(void);
1191
1192         if (exception > 0x3F)
1193                 return -EINVAL;
1194
1195         curr_handler = ex_table[exception];
1196
1197         if (curr_handler != handler)
1198                 return -EBUSY;
1199
1200         ex_table[exception] = ex_replaceable;
1201
1202         return 0;
1203 }
1204 EXPORT_SYMBOL(bfin_free_exception);
1205
1206 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1207 {
1208         switch (cplb_panic) {
1209         case CPLB_NO_UNLOCKED:
1210                 printk(KERN_EMERG "All CPLBs are locked\n");
1211                 break;
1212         case CPLB_PROT_VIOL:
1213                 return;
1214         case CPLB_NO_ADDR_MATCH:
1215                 return;
1216         case CPLB_UNKNOWN_ERR:
1217                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1218                 break;
1219         }
1220
1221         oops_in_progress = 1;
1222
1223         dump_bfin_process(fp);
1224         dump_bfin_mem(fp);
1225         show_regs(fp);
1226         dump_stack();
1227         panic("Unrecoverable event\n");
1228 }