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