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   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_DEBUG_VERBOSE
  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                                         char *d_name = d_path(&file->f_path, _tmpbuf,
 152                                                       sizeof(_tmpbuf));
 153                                         if (!IS_ERR(d_name))
 154                                                 name = d_name;
 155                                 }
 156
 157                                 /* FLAT does not have its text aligned to the start of
 158                                  * the map while FDPIC ELF does ...
 159                                  */
 160
 161                                 /* before we can check flat/fdpic, we need to
 162                                  * make sure current is valid
 163                                  */
 164                                 if ((unsigned long)current >= FIXED_CODE_START &&
 165                                     !((unsigned long)current & 0x3)) {
 166                                         if (current->mm &&
 167                                             (address > current->mm->start_code) &&
 168                                             (address < current->mm->end_code))
 169                                                 offset = address - current->mm->start_code;
 170                                         else
 171                                                 offset = (address - vma->vm_start) +
 172                                                          (vma->vm_pgoff << PAGE_SHIFT);
 173
 174                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 175                                                 (void *)address, name, offset);
 176                                 } else
 177                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
 178                                                 (void *)address, name,
 179                                                 vma->vm_start, vma->vm_end);
 180
 181                                 if (!in_atomic)
 182                                         mmput(mm);
 183
 184                                 if (!strlen(buf))
 185                                         sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
 186
 187                                 goto done;
 188                         }
 189
 190                         vml = vml->next;
 191                 }
 192                 if (!in_atomic)
 193                         mmput(mm);
 194         }
 195
 196         /* we were unable to find this address anywhere */
 197         sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
 198
 199 done:
 200         write_unlock_irqrestore(&tasklist_lock, flags);
 201 #else
 202         sprintf(buf, " ");
 203 #endif
 204 }
 205
 206 asmlinkage void double_fault_c(struct pt_regs *fp)
 207 {
 208         console_verbose();
 209         oops_in_progress = 1;
 210 #ifdef CONFIG_DEBUG_VERBOSE
 211         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 212 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 213         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 214                 char buf[150];
 215                 decode_address(buf, saved_retx);
 216                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 217                         (int)saved_seqstat & SEQSTAT_EXCAUSE, buf);
 218                 decode_address(buf, saved_dcplb_fault_addr);
 219                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 220                 decode_address(buf, saved_icplb_fault_addr);
 221                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 222
 223                 decode_address(buf, fp->retx);
 224                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n",
 225                         buf);
 226         } else
 227 #endif
 228         {
 229                 dump_bfin_process(fp);
 230                 dump_bfin_mem(fp);
 231                 show_regs(fp);
 232         }
 233 #endif
 234         panic("Double Fault - unrecoverable event\n");
 235
 236 }
 237
 238 asmlinkage void trap_c(struct pt_regs *fp)
 239 {
 240 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 241         int j;
 242 #endif
 243         int sig = 0;
 244         siginfo_t info;
 245         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 246
 247         trace_buffer_save(j);
 248
 249         /* Important - be very careful dereferncing pointers - will lead to
 250          * double faults if the stack has become corrupt
 251          */
 252
 253         /* If the fault was caused by a kernel thread, or interrupt handler
 254          * we will kernel panic, so the system reboots.
 255          * If KGDB is enabled, don't set this for kernel breakpoints
 256         */
 257
 258         /* TODO: check to see if we are in some sort of deferred HWERR
 259          * that we should be able to recover from, not kernel panic
 260          */
 261         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
 262 #ifdef CONFIG_KGDB
 263                 && (trapnr != VEC_EXCPT02)
 264 #endif
 265         ){
 266                 console_verbose();
 267                 oops_in_progress = 1;
 268         } else if (current) {
 269                 if (current->mm == NULL) {
 270                         console_verbose();
 271                         oops_in_progress = 1;
 272                 }
 273         }
 274
 275         /* trap_c() will be called for exceptions. During exceptions
 276          * processing, the pc value should be set with retx value.
 277          * With this change we can cleanup some code in signal.c- TODO
 278          */
 279         fp->orig_pc = fp->retx;
 280         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 281                 trapnr, fp->ipend, fp->pc, fp->retx); */
 282
 283         /* send the appropriate signal to the user program */
 284         switch (trapnr) {
 285
 286         /* This table works in conjuction with the one in ./mach-common/entry.S
 287          * Some exceptions are handled there (in assembly, in exception space)
 288          * Some are handled here, (in C, in interrupt space)
 289          * Some, like CPLB, are handled in both, where the normal path is
 290          * handled in assembly/exception space, and the error path is handled
 291          * here
 292          */
 293
 294         /* 0x00 - Linux Syscall, getting here is an error */
 295         /* 0x01 - userspace gdb breakpoint, handled here */
 296         case VEC_EXCPT01:
 297                 info.si_code = TRAP_ILLTRAP;
 298                 sig = SIGTRAP;
 299                 CHK_DEBUGGER_TRAP_MAYBE();
 300                 /* Check if this is a breakpoint in kernel space */
 301                 if (fp->ipend & 0xffc0)
 302                         return;
 303                 else
 304                         break;
 305         /* 0x03 - User Defined, userspace stack overflow */
 306         case VEC_EXCPT03:
 307                 info.si_code = SEGV_STACKFLOW;
 308                 sig = SIGSEGV;
 309                 verbose_printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
 310                 CHK_DEBUGGER_TRAP_MAYBE();
 311                 break;
 312         /* 0x02 - KGDB initial connection and break signal trap */
 313         case VEC_EXCPT02:
 314 #ifdef CONFIG_KGDB
 315                 info.si_code = TRAP_ILLTRAP;
 316                 sig = SIGTRAP;
 317                 CHK_DEBUGGER_TRAP();
 318                 return;
 319 #endif
 320         /* 0x04 - User Defined */
 321         /* 0x05 - User Defined */
 322         /* 0x06 - User Defined */
 323         /* 0x07 - User Defined */
 324         /* 0x08 - User Defined */
 325         /* 0x09 - User Defined */
 326         /* 0x0A - User Defined */
 327         /* 0x0B - User Defined */
 328         /* 0x0C - User Defined */
 329         /* 0x0D - User Defined */
 330         /* 0x0E - User Defined */
 331         /* 0x0F - User Defined */
 332         /* If we got here, it is most likely that someone was trying to use a
 333          * custom exception handler, and it is not actually installed properly
 334          */
 335         case VEC_EXCPT04 ... VEC_EXCPT15:
 336                 info.si_code = ILL_ILLPARAOP;
 337                 sig = SIGILL;
 338                 verbose_printk(KERN_NOTICE EXC_0x04(KERN_NOTICE));
 339                 CHK_DEBUGGER_TRAP_MAYBE();
 340                 break;
 341         /* 0x10 HW Single step, handled here */
 342         case VEC_STEP:
 343                 info.si_code = TRAP_STEP;
 344                 sig = SIGTRAP;
 345                 CHK_DEBUGGER_TRAP_MAYBE();
 346                 /* Check if this is a single step in kernel space */
 347                 if (fp->ipend & 0xffc0)
 348                         return;
 349                 else
 350                         break;
 351         /* 0x11 - Trace Buffer Full, handled here */
 352         case VEC_OVFLOW:
 353                 info.si_code = TRAP_TRACEFLOW;
 354                 sig = SIGTRAP;
 355                 verbose_printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
 356                 CHK_DEBUGGER_TRAP_MAYBE();
 357                 break;
 358         /* 0x12 - Reserved, Caught by default */
 359         /* 0x13 - Reserved, Caught by default */
 360         /* 0x14 - Reserved, Caught by default */
 361         /* 0x15 - Reserved, Caught by default */
 362         /* 0x16 - Reserved, Caught by default */
 363         /* 0x17 - Reserved, Caught by default */
 364         /* 0x18 - Reserved, Caught by default */
 365         /* 0x19 - Reserved, Caught by default */
 366         /* 0x1A - Reserved, Caught by default */
 367         /* 0x1B - Reserved, Caught by default */
 368         /* 0x1C - Reserved, Caught by default */
 369         /* 0x1D - Reserved, Caught by default */
 370         /* 0x1E - Reserved, Caught by default */
 371         /* 0x1F - Reserved, Caught by default */
 372         /* 0x20 - Reserved, Caught by default */
 373         /* 0x21 - Undefined Instruction, handled here */
 374         case VEC_UNDEF_I:
 375                 info.si_code = ILL_ILLOPC;
 376                 sig = SIGILL;
 377                 verbose_printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
 378                 CHK_DEBUGGER_TRAP_MAYBE();
 379                 break;
 380         /* 0x22 - Illegal Instruction Combination, handled here */
 381         case VEC_ILGAL_I:
 382                 info.si_code = ILL_ILLPARAOP;
 383                 sig = SIGILL;
 384                 verbose_printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
 385                 CHK_DEBUGGER_TRAP_MAYBE();
 386                 break;
 387         /* 0x23 - Data CPLB protection violation, handled here */
 388         case VEC_CPLB_VL:
 389                 info.si_code = ILL_CPLB_VI;
 390                 sig = SIGBUS;
 391                 verbose_printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
 392                 CHK_DEBUGGER_TRAP_MAYBE();
 393                 break;
 394         /* 0x24 - Data access misaligned, handled here */
 395         case VEC_MISALI_D:
 396                 info.si_code = BUS_ADRALN;
 397                 sig = SIGBUS;
 398                 verbose_printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
 399                 CHK_DEBUGGER_TRAP_MAYBE();
 400                 break;
 401         /* 0x25 - Unrecoverable Event, handled here */
 402         case VEC_UNCOV:
 403                 info.si_code = ILL_ILLEXCPT;
 404                 sig = SIGILL;
 405                 verbose_printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
 406                 CHK_DEBUGGER_TRAP_MAYBE();
 407                 break;
 408         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 409                 error case is handled here */
 410         case VEC_CPLB_M:
 411                 info.si_code = BUS_ADRALN;
 412                 sig = SIGBUS;
 413                 verbose_printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
 414                 break;
 415         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 416         case VEC_CPLB_MHIT:
 417                 info.si_code = ILL_CPLB_MULHIT;
 418                 sig = SIGSEGV;
 419 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 420                 if (saved_dcplb_fault_addr < FIXED_CODE_START)
 421                         verbose_printk(KERN_NOTICE "NULL pointer access\n");
 422                 else
 423 #endif
 424                         verbose_printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
 425                 CHK_DEBUGGER_TRAP_MAYBE();
 426                 break;
 427         /* 0x28 - Emulation Watchpoint, handled here */
 428         case VEC_WATCH:
 429                 info.si_code = TRAP_WATCHPT;
 430                 sig = SIGTRAP;
 431                 pr_debug(EXC_0x28(KERN_DEBUG));
 432                 CHK_DEBUGGER_TRAP_MAYBE();
 433                 /* Check if this is a watchpoint in kernel space */
 434                 if (fp->ipend & 0xffc0)
 435                         return;
 436                 else
 437                         break;
 438 #ifdef CONFIG_BF535
 439         /* 0x29 - Instruction fetch access error (535 only) */
 440         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 441                 info.si_code = BUS_OPFETCH;
 442                 sig = SIGBUS;
 443                 verbose_printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 444                 CHK_DEBUGGER_TRAP_MAYBE();
 445                 break;
 446 #else
 447         /* 0x29 - Reserved, Caught by default */
 448 #endif
 449         /* 0x2A - Instruction fetch misaligned, handled here */
 450         case VEC_MISALI_I:
 451                 info.si_code = BUS_ADRALN;
 452                 sig = SIGBUS;
 453                 verbose_printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
 454                 CHK_DEBUGGER_TRAP_MAYBE();
 455                 break;
 456         /* 0x2B - Instruction CPLB protection violation, handled here */
 457         case VEC_CPLB_I_VL:
 458                 info.si_code = ILL_CPLB_VI;
 459                 sig = SIGBUS;
 460                 verbose_printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
 461                 CHK_DEBUGGER_TRAP_MAYBE();
 462                 break;
 463         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 464         case VEC_CPLB_I_M:
 465                 info.si_code = ILL_CPLB_MISS;
 466                 sig = SIGBUS;
 467                 verbose_printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
 468                 break;
 469         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 470         case VEC_CPLB_I_MHIT:
 471                 info.si_code = ILL_CPLB_MULHIT;
 472                 sig = SIGSEGV;
 473 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 474                 if (saved_icplb_fault_addr < FIXED_CODE_START)
 475                         verbose_printk(KERN_NOTICE "Jump to NULL address\n");
 476                 else
 477 #endif
 478                         verbose_printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
 479                 CHK_DEBUGGER_TRAP_MAYBE();
 480                 break;
 481         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 482         case VEC_ILL_RES:
 483                 info.si_code = ILL_PRVOPC;
 484                 sig = SIGILL;
 485                 verbose_printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
 486                 CHK_DEBUGGER_TRAP_MAYBE();
 487                 break;
 488         /* 0x2F - Reserved, Caught by default */
 489         /* 0x30 - Reserved, Caught by default */
 490         /* 0x31 - Reserved, Caught by default */
 491         /* 0x32 - Reserved, Caught by default */
 492         /* 0x33 - Reserved, Caught by default */
 493         /* 0x34 - Reserved, Caught by default */
 494         /* 0x35 - Reserved, Caught by default */
 495         /* 0x36 - Reserved, Caught by default */
 496         /* 0x37 - Reserved, Caught by default */
 497         /* 0x38 - Reserved, Caught by default */
 498         /* 0x39 - Reserved, Caught by default */
 499         /* 0x3A - Reserved, Caught by default */
 500         /* 0x3B - Reserved, Caught by default */
 501         /* 0x3C - Reserved, Caught by default */
 502         /* 0x3D - Reserved, Caught by default */
 503         /* 0x3E - Reserved, Caught by default */
 504         /* 0x3F - Reserved, Caught by default */
 505         case VEC_HWERR:
 506                 info.si_code = BUS_ADRALN;
 507                 sig = SIGBUS;
 508                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 509                 /* System MMR Error */
 510                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 511                         info.si_code = BUS_ADRALN;
 512                         sig = SIGBUS;
 513                         verbose_printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
 514                         break;
 515                 /* External Memory Addressing Error */
 516                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 517                         info.si_code = BUS_ADRERR;
 518                         sig = SIGBUS;
 519                         verbose_printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
 520                         break;
 521                 /* Performance Monitor Overflow */
 522                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 523                         verbose_printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
 524                         break;
 525                 /* RAISE 5 instruction */
 526                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 527                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 528                         break;
 529                 default:        /* Reserved */
 530                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 531                         break;
 532                 }
 533                 CHK_DEBUGGER_TRAP_MAYBE();
 534                 break;
 535         /*
 536          * We should be handling all known exception types above,
 537          * if we get here we hit a reserved one, so panic
 538          */
 539         default:
 540                 oops_in_progress = 1;
 541                 info.si_code = ILL_ILLPARAOP;
 542                 sig = SIGILL;
 543                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 544                         (fp->seqstat & SEQSTAT_EXCAUSE));
 545                 CHK_DEBUGGER_TRAP_MAYBE();
 546                 break;
 547         }
 548
 549         BUG_ON(sig == 0);
 550
 551         if (sig != SIGTRAP) {
 552                 dump_bfin_process(fp);
 553                 dump_bfin_mem(fp);
 554                 show_regs(fp);
 555
 556                 /* Print out the trace buffer if it makes sense */
 557 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 558                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 559                         verbose_printk(KERN_NOTICE "No trace since you do not have "
 560                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 561                                 KERN_NOTICE "\n");
 562                 else
 563 #endif
 564                         dump_bfin_trace_buffer();
 565
 566                 if (oops_in_progress) {
 567                         /* Dump the current kernel stack */
 568                         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "Kernel Stack\n");
 569                         show_stack(current, NULL);
 570                         print_modules();
 571 #ifndef CONFIG_ACCESS_CHECK
 572                         verbose_printk(KERN_EMERG "Please turn on "
 573                                "CONFIG_ACCESS_CHECK\n");
 574 #endif
 575                         panic("Kernel exception");
 576                 } else {
 577 #ifdef CONFIG_DEBUG_VERBOSE
 578                         unsigned long *stack;
 579                         /* Dump the user space stack */
 580                         stack = (unsigned long *)rdusp();
 581                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
 582                         show_stack(NULL, stack);
 583 #endif
 584                 }
 585         }
 586
 587         info.si_signo = sig;
 588         info.si_errno = 0;
 589         info.si_addr = (void __user *)fp->pc;
 590         force_sig_info(sig, &info, current);
 591
 592         trace_buffer_restore(j);
 593         return;
 594 }
 595
 596 /* Typical exception handling routines  */
 597
 598 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 599
 600 /*
 601  * Similar to get_user, do some address checking, then dereference
 602  * Return true on sucess, false on bad address
 603  */
 604 static bool get_instruction(unsigned short *val, unsigned short *address)
 605 {
 606
 607         unsigned long addr;
 608
 609         addr = (unsigned long)address;
 610
 611         /* Check for odd addresses */
 612         if (addr & 0x1)
 613                 return false;
 614
 615         /* Check that things do not wrap around */
 616         if (addr > (addr + 2))
 617                 return false;
 618
 619         /*
 620          * Since we are in exception context, we need to do a little address checking
 621          * We need to make sure we are only accessing valid memory, and
 622          * we don't read something in the async space that can hang forever
 623          */
 624         if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
 625 #if L2_LENGTH != 0
 626             (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
 627 #endif
 628             (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||
 629 #if L1_DATA_A_LENGTH != 0
 630             (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) ||
 631 #endif
 632 #if L1_DATA_B_LENGTH != 0
 633             (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) ||
 634 #endif
 635             (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) ||
 636             (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) &&
 637                addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) ||
 638             (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) &&
 639                addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) ||
 640             (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) &&
 641                addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) ||
 642             (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) &&
 643               addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) {
 644                 *val = *address;
 645                 return true;
 646         }
 647
 648 #if L1_CODE_LENGTH != 0
 649         if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) {
 650                 isram_memcpy(val, address, 2);
 651                 return true;
 652         }
 653 #endif
 654
 655
 656         return false;
 657 }
 658
 659 /*
 660  * decode the instruction if we are printing out the trace, as it
 661  * makes things easier to follow, without running it through objdump
 662  * These are the normal instructions which cause change of flow, which
 663  * would be at the source of the trace buffer
 664  */
 665 #ifdef CONFIG_DEBUG_VERBOSE
 666 static void decode_instruction(unsigned short *address)
 667 {
 668         unsigned short opcode;
 669
 670         if (get_instruction(&opcode, address)) {
 671                 if (opcode == 0x0010)
 672                         verbose_printk("RTS");
 673                 else if (opcode == 0x0011)
 674                         verbose_printk("RTI");
 675                 else if (opcode == 0x0012)
 676                         verbose_printk("RTX");
 677                 else if (opcode >= 0x0050 && opcode <= 0x0057)
 678                         verbose_printk("JUMP (P%i)", opcode & 7);
 679                 else if (opcode >= 0x0060 && opcode <= 0x0067)
 680                         verbose_printk("CALL (P%i)", opcode & 7);
 681                 else if (opcode >= 0x0070 && opcode <= 0x0077)
 682                         verbose_printk("CALL (PC+P%i)", opcode & 7);
 683                 else if (opcode >= 0x0080 && opcode <= 0x0087)
 684                         verbose_printk("JUMP (PC+P%i)", opcode & 7);
 685                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
 686                         verbose_printk("IF !CC JUMP");
 687                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
 688                         verbose_printk("IF CC JUMP");
 689                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
 690                         verbose_printk("JUMP.S");
 691                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
 692                         verbose_printk("LSETUP");
 693                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
 694                         verbose_printk("JUMP.L");
 695                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
 696                         verbose_printk("CALL pcrel");
 697                 else
 698                         verbose_printk("0x%04x", opcode);
 699         }
 700
 701 }
 702 #endif
 703
 704 void dump_bfin_trace_buffer(void)
 705 {
 706 #ifdef CONFIG_DEBUG_VERBOSE
 707 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 708         int tflags, i = 0;
 709         char buf[150];
 710         unsigned short *addr;
 711 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 712         int j, index;
 713 #endif
 714
 715         trace_buffer_save(tflags);
 716
 717         printk(KERN_NOTICE "Hardware Trace:\n");
 718
 719 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 720         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
 721 #endif
 722
 723         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 724                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 725                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 726                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 727                         addr = (unsigned short *)bfin_read_TBUF();
 728                         decode_address(buf, (unsigned long)addr);
 729                         printk(KERN_NOTICE "     Source : %s ", buf);
 730                         decode_instruction(addr);
 731                         printk("\n");
 732                 }
 733         }
 734
 735 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 736         if (trace_buff_offset)
 737                 index = trace_buff_offset / 4;
 738         else
 739                 index = EXPAND_LEN;
 740
 741         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 742         while (j) {
 743                 decode_address(buf, software_trace_buff[index]);
 744                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 745                 index -= 1;
 746                 if (index < 0 )
 747                         index = EXPAND_LEN;
 748                 decode_address(buf, software_trace_buff[index]);
 749                 printk(KERN_NOTICE "     Source : %s ", buf);
 750                 decode_instruction((unsigned short *)software_trace_buff[index]);
 751                 printk("\n");
 752                 index -= 1;
 753                 if (index < 0)
 754                         index = EXPAND_LEN;
 755                 j--;
 756                 i++;
 757         }
 758 #endif
 759
 760         trace_buffer_restore(tflags);
 761 #endif
 762 #endif
 763 }
 764 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 765
 766 /*
 767  * Checks to see if the address pointed to is either a
 768  * 16-bit CALL instruction, or a 32-bit CALL instruction
 769  */
 770 static bool is_bfin_call(unsigned short *addr)
 771 {
 772         unsigned short opcode = 0, *ins_addr;
 773         ins_addr = (unsigned short *)addr;
 774
 775         if (!get_instruction(&opcode, ins_addr))
 776                 return false;
 777
 778         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
 779             (opcode >= 0x0070 && opcode <= 0x0077))
 780                 return true;
 781
 782         ins_addr--;
 783         if (!get_instruction(&opcode, ins_addr))
 784                 return false;
 785
 786         if (opcode >= 0xE300 && opcode <= 0xE3FF)
 787                 return true;
 788
 789         return false;
 790
 791 }
 792
 793 void show_stack(struct task_struct *task, unsigned long *stack)
 794 {
 795 #ifdef CONFIG_PRINTK
 796         unsigned int *addr, *endstack, *fp = 0, *frame;
 797         unsigned short *ins_addr;
 798         char buf[150];
 799         unsigned int i, j, ret_addr, frame_no = 0;
 800
 801         /*
 802          * If we have been passed a specific stack, use that one otherwise
 803          *    if we have been passed a task structure, use that, otherwise
 804          *    use the stack of where the variable "stack" exists
 805          */
 806
 807         if (stack == NULL) {
 808                 if (task) {
 809                         /* We know this is a kernel stack, so this is the start/end */
 810                         stack = (unsigned long *)task->thread.ksp;
 811                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
 812                 } else {
 813                         /* print out the existing stack info */
 814                         stack = (unsigned long *)&stack;
 815                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 816                 }
 817         } else
 818                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 819
 820         printk(KERN_NOTICE "Stack info:\n");
 821         decode_address(buf, (unsigned int)stack);
 822         printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
 823
 824         addr = (unsigned int *)((unsigned int)stack & ~0x3F);
 825
 826         /* First thing is to look for a frame pointer */
 827         for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 828                 addr < endstack; addr++, i++) {
 829                 if (*addr & 0x1)
 830                         continue;
 831                 ins_addr = (unsigned short *)*addr;
 832                 ins_addr--;
 833                 if (is_bfin_call(ins_addr))
 834                         fp = addr - 1;
 835
 836                 if (fp) {
 837                         /* Let's check to see if it is a frame pointer */
 838                         while (fp >= (addr - 1) && fp < endstack && fp)
 839                                 fp = (unsigned int *)*fp;
 840                         if (fp == 0 || fp == endstack) {
 841                                 fp = addr - 1;
 842                                 break;
 843                         }
 844                         fp = 0;
 845                 }
 846         }
 847         if (fp) {
 848                 frame = fp;
 849                 printk(" FP: (0x%p)\n", fp);
 850         } else
 851                 frame = 0;
 852
 853         /*
 854          * Now that we think we know where things are, we
 855          * walk the stack again, this time printing things out
 856          * incase there is no frame pointer, we still look for
 857          * valid return addresses
 858          */
 859
 860         /* First time print out data, next time, print out symbols */
 861         for (j = 0; j <= 1; j++) {
 862                 if (j)
 863                         printk(KERN_NOTICE "Return addresses in stack:\n");
 864                 else
 865                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
 866
 867                 fp = frame;
 868                 frame_no = 0;
 869
 870                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 871                      addr <= endstack; addr++, i++) {
 872
 873                         ret_addr = 0;
 874                         if (!j && i % 8 == 0)
 875                                 printk("\n" KERN_NOTICE "%p:",addr);
 876
 877                         /* if it is an odd address, or zero, just skip it */
 878                         if (*addr & 0x1 || !*addr)
 879                                 goto print;
 880
 881                         ins_addr = (unsigned short *)*addr;
 882
 883                         /* Go back one instruction, and see if it is a CALL */
 884                         ins_addr--;
 885                         ret_addr = is_bfin_call(ins_addr);
 886  print:
 887                         if (!j && stack == (unsigned long *)addr)
 888                                 printk("[%08x]", *addr);
 889                         else if (ret_addr)
 890                                 if (j) {
 891                                         decode_address(buf, (unsigned int)*addr);
 892                                         if (frame == addr) {
 893                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
 894                                                 continue;
 895                                         }
 896                                         printk(KERN_NOTICE "    address : %s\n", buf);
 897                                 } else
 898                                         printk("<%08x>", *addr);
 899                         else if (fp == addr) {
 900                                 if (j)
 901                                         frame = addr+1;
 902                                 else
 903                                         printk("(%08x)", *addr);
 904
 905                                 fp = (unsigned int *)*addr;
 906                                 frame_no++;
 907
 908                         } else if (!j)
 909                                 printk(" %08x ", *addr);
 910                 }
 911                 if (!j)
 912                         printk("\n");
 913         }
 914 #endif
 915 }
 916
 917 void dump_stack(void)
 918 {
 919         unsigned long stack;
 920 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 921         int tflags;
 922 #endif
 923         trace_buffer_save(tflags);
 924         dump_bfin_trace_buffer();
 925         show_stack(current, &stack);
 926         trace_buffer_restore(tflags);
 927 }
 928 EXPORT_SYMBOL(dump_stack);
 929
 930 void dump_bfin_process(struct pt_regs *fp)
 931 {
 932 #ifdef CONFIG_DEBUG_VERBOSE
 933         /* We should be able to look at fp->ipend, but we don't push it on the
 934          * stack all the time, so do this until we fix that */
 935         unsigned int context = bfin_read_IPEND();
 936
 937         if (oops_in_progress)
 938                 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
 939
 940         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 941                 verbose_printk(KERN_NOTICE "HW Error context\n");
 942         else if (context & 0x0020)
 943                 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
 944         else if (context & 0x3FC0)
 945                 verbose_printk(KERN_NOTICE "Interrupt context\n");
 946         else if (context & 0x4000)
 947                 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
 948         else if (context & 0x8000)
 949                 verbose_printk(KERN_NOTICE "Kernel process context\n");
 950
 951         /* Because we are crashing, and pointers could be bad, we check things
 952          * pretty closely before we use them
 953          */
 954         if ((unsigned long)current >= FIXED_CODE_START &&
 955             !((unsigned long)current & 0x3) && current->pid) {
 956                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
 957                 if (current->comm >= (char *)FIXED_CODE_START)
 958                         verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
 959                                 current->comm, current->pid);
 960                 else
 961                         verbose_printk(KERN_NOTICE "COMM= invalid\n");
 962
 963                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
 964                         verbose_printk(KERN_NOTICE  "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
 965                                 KERN_NOTICE " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n"
 966                                 KERN_NOTICE "\n",
 967                                 (void *)current->mm->start_code,
 968                                 (void *)current->mm->end_code,
 969                                 (void *)current->mm->start_data,
 970                                 (void *)current->mm->end_data,
 971                                 (void *)current->mm->end_data,
 972                                 (void *)current->mm->brk,
 973                                 (void *)current->mm->start_stack);
 974                 else
 975                         verbose_printk(KERN_NOTICE "invalid mm\n");
 976         } else
 977                 verbose_printk(KERN_NOTICE "\n" KERN_NOTICE
 978                      "No Valid process in current context\n");
 979 #endif
 980 }
 981
 982 void dump_bfin_mem(struct pt_regs *fp)
 983 {
 984 #ifdef CONFIG_DEBUG_VERBOSE
 985         unsigned short *addr, *erraddr, val = 0, err = 0;
 986         char sti = 0, buf[6];
 987
 988         erraddr = (void *)fp->pc;
 989
 990         verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
 991
 992         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
 993              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
 994              addr++) {
 995                 if (!((unsigned long)addr & 0xF))
 996                         verbose_printk("\n" KERN_NOTICE "0x%p: ", addr);
 997
 998                 if (!get_instruction(&val, addr)) {
 999                                 val = 0;
1000                                 sprintf(buf, "????");
1001                 } else
1002                         sprintf(buf, "%04x", val);
1003
1004                 if (addr == erraddr) {
1005                         verbose_printk("[%s]", buf);
1006                         err = val;
1007                 } else
1008                         verbose_printk(" %s ", buf);
1009
1010                 /* Do any previous instructions turn on interrupts? */
1011                 if (addr <= erraddr &&                          /* in the past */
1012                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
1013                       val == 0x017b))                           /* [SP++] = RETI */
1014                         sti = 1;
1015         }
1016
1017         verbose_printk("\n");
1018
1019         /* Hardware error interrupts can be deferred */
1020         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1021             oops_in_progress)){
1022                 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1023 #ifndef CONFIG_DEBUG_HWERR
1024                 verbose_printk(KERN_NOTICE "The remaining message may be meaningless\n"
1025                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
1026                          " better idea where it came from\n");
1027 #else
1028                 /* If we are handling only one peripheral interrupt
1029                  * and current mm and pid are valid, and the last error
1030                  * was in that user space process's text area
1031                  * print it out - because that is where the problem exists
1032                  */
1033                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1034                      (current->pid && current->mm)) {
1035                         /* And the last RETI points to the current userspace context */
1036                         if ((fp + 1)->pc >= current->mm->start_code &&
1037                             (fp + 1)->pc <= current->mm->end_code) {
1038                                 verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
1039                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1040                                 show_regs(fp + 1);
1041                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1042                         }
1043                 }
1044 #endif
1045         }
1046 #endif
1047 }
1048
1049 void show_regs(struct pt_regs *fp)
1050 {
1051 #ifdef CONFIG_DEBUG_VERBOSE
1052         char buf [150];
1053         struct irqaction *action;
1054         unsigned int i;
1055         unsigned long flags;
1056
1057         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
1058         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
1059                 (long)fp->seqstat, fp->ipend, fp->syscfg);
1060         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1061                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1062                         (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1063 #ifdef EBIU_ERRMST
1064                 /* If the error was from the EBIU, print it out */
1065                 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1066                         verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
1067                                 bfin_read_EBIU_ERRMST());
1068                         verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
1069                                 bfin_read_EBIU_ERRADD());
1070                 }
1071 #endif
1072         }
1073         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1074                 fp->seqstat & SEQSTAT_EXCAUSE);
1075         for (i = 6; i <= 15 ; i++) {
1076                 if (fp->ipend & (1 << i)) {
1077                         decode_address(buf, bfin_read32(EVT0 + 4*i));
1078                         verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1079                 }
1080         }
1081
1082         /* if no interrupts are going off, don't print this out */
1083         if (fp->ipend & ~0x3F) {
1084                 for (i = 0; i < (NR_IRQS - 1); i++) {
1085                         spin_lock_irqsave(&irq_desc[i].lock, flags);
1086                         action = irq_desc[i].action;
1087                         if (!action)
1088                                 goto unlock;
1089
1090                         decode_address(buf, (unsigned int)action->handler);
1091                         verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1092                         for (action = action->next; action; action = action->next) {
1093                                 decode_address(buf, (unsigned int)action->handler);
1094                                 verbose_printk(", %s", buf);
1095                         }
1096                         verbose_printk("\n");
1097 unlock:
1098                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1099                 }
1100         }
1101
1102         decode_address(buf, fp->rete);
1103         verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1104         decode_address(buf, fp->retn);
1105         verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1106         decode_address(buf, fp->retx);
1107         verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1108         decode_address(buf, fp->rets);
1109         verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1110         decode_address(buf, fp->pc);
1111         verbose_printk(KERN_NOTICE " PC  : %s\n", buf);
1112
1113         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1114             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1115                 decode_address(buf, saved_dcplb_fault_addr);
1116                 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1117                 decode_address(buf, saved_icplb_fault_addr);
1118                 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1119         }
1120
1121         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
1122         verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1123                 fp->r0, fp->r1, fp->r2, fp->r3);
1124         verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1125                 fp->r4, fp->r5, fp->r6, fp->r7);
1126         verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1127                 fp->p0, fp->p1, fp->p2, fp->p3);
1128         verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1129                 fp->p4, fp->p5, fp->fp, (long)fp);
1130         verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1131                 fp->lb0, fp->lt0, fp->lc0);
1132         verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1133                 fp->lb1, fp->lt1, fp->lc1);
1134         verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1135                 fp->b0, fp->l0, fp->m0, fp->i0);
1136         verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1137                 fp->b1, fp->l1, fp->m1, fp->i1);
1138         verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1139                 fp->b2, fp->l2, fp->m2, fp->i2);
1140         verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1141                 fp->b3, fp->l3, fp->m3, fp->i3);
1142         verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1143                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1144
1145         verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1146                 rdusp(), fp->astat);
1147
1148         verbose_printk(KERN_NOTICE "\n");
1149 #endif
1150 }
1151
1152 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1153 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1154 #endif
1155
1156 asmlinkage int sys_bfin_spinlock(int *spinlock)
1157 {
1158         int ret = 0;
1159         int tmp = 0;
1160
1161         local_irq_disable();
1162         ret = get_user(tmp, spinlock);
1163         if (ret == 0) {
1164                 if (tmp)
1165                         ret = 1;
1166                 tmp = 1;
1167                 put_user(tmp, spinlock);
1168         }
1169         local_irq_enable();
1170         return ret;
1171 }
1172
1173 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1174 {
1175         void (*curr_handler)(void);
1176
1177         if (exception > 0x3F)
1178                 return -EINVAL;
1179
1180         curr_handler = ex_table[exception];
1181
1182         if (curr_handler != ex_replaceable)
1183                 return -EBUSY;
1184
1185         ex_table[exception] = handler;
1186
1187         return 0;
1188 }
1189 EXPORT_SYMBOL(bfin_request_exception);
1190
1191 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1192 {
1193         void (*curr_handler)(void);
1194
1195         if (exception > 0x3F)
1196                 return -EINVAL;
1197
1198         curr_handler = ex_table[exception];
1199
1200         if (curr_handler != handler)
1201                 return -EBUSY;
1202
1203         ex_table[exception] = ex_replaceable;
1204
1205         return 0;
1206 }
1207 EXPORT_SYMBOL(bfin_free_exception);
1208
1209 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1210 {
1211         switch (cplb_panic) {
1212         case CPLB_NO_UNLOCKED:
1213                 printk(KERN_EMERG "All CPLBs are locked\n");
1214                 break;
1215         case CPLB_PROT_VIOL:
1216                 return;
1217         case CPLB_NO_ADDR_MATCH:
1218                 return;
1219         case CPLB_UNKNOWN_ERR:
1220                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1221                 break;
1222         }
1223
1224         oops_in_progress = 1;
1225
1226         dump_bfin_process(fp);
1227         dump_bfin_mem(fp);
1228         show_regs(fp);
1229         dump_stack();
1230         panic("Unrecoverable event\n");
1231 }