arch/blackfin/kernel/traps.c

   1 /*
   2  * File:         arch/blackfin/kernel/traps.c
   3  * Based on:
   4  * Author:       Hamish Macdonald
   5  *
   6  * Created:
   7  * Description:  uses S/W interrupt 15 for the system calls
   8  *
   9  * Modified:
  10  *               Copyright 2004-2006 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 #include <linux/uaccess.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/module.h>
  33 #include <linux/kallsyms.h>
  34 #include <linux/fs.h>
  35 #include <asm/traps.h>
  36 #include <asm/cacheflush.h>
  37 #include <asm/cplb.h>
  38 #include <asm/blackfin.h>
  39 #include <asm/irq_handler.h>
  40 #include <linux/irq.h>
  41 #include <asm/trace.h>
  42 #include <asm/fixed_code.h>
  43 #include <asm/dma.h>
  44
  45 #ifdef CONFIG_KGDB
  46 # include <linux/kgdb.h>
  47
  48 # define CHK_DEBUGGER_TRAP() \
  49         do { \
  50                 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
  51         } while (0)
  52 # define CHK_DEBUGGER_TRAP_MAYBE() \
  53         do { \
  54                 if (kgdb_connected) \
  55                         CHK_DEBUGGER_TRAP(); \
  56         } while (0)
  57 #else
  58 # define CHK_DEBUGGER_TRAP() do { } while (0)
  59 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  60 #endif
  61
  62 /* Initiate the event table handler */
  63 void __init trap_init(void)
  64 {
  65         CSYNC();
  66         bfin_write_EVT3(trap);
  67         CSYNC();
  68 }
  69
  70 /*
  71  * Used to save the RETX, SEQSTAT, I/D CPLB FAULT ADDR
  72  * values across the transition from exception to IRQ5.
  73  * We put these in L1, so they are going to be in a valid
  74  * location during exception context
  75  */
  76 __attribute__((l1_data))
  77 unsigned long saved_retx, saved_seqstat,
  78         saved_icplb_fault_addr, saved_dcplb_fault_addr;
  79
  80 static void decode_address(char *buf, unsigned long address)
  81 {
  82         struct vm_list_struct *vml;
  83         struct task_struct *p;
  84         struct mm_struct *mm;
  85         unsigned long flags, offset;
  86         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
  87
  88 #ifdef CONFIG_KALLSYMS
  89         unsigned long symsize;
  90         const char *symname;
  91         char *modname;
  92         char *delim = ":";
  93         char namebuf[128];
  94
  95         /* look up the address and see if we are in kernel space */
  96         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
  97
  98         if (symname) {
  99                 /* yeah! kernel space! */
 100                 if (!modname)
 101                         modname = delim = "";
 102                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
 103                               (void *)address, delim, modname, delim, symname,
 104                               (unsigned long)offset);
 105                 return;
 106
 107         }
 108 #endif
 109
 110         /* Problem in fixed code section? */
 111         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 112                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
 113                 return;
 114         }
 115
 116         /* Problem somewhere before the kernel start address */
 117         if (address < CONFIG_BOOT_LOAD) {
 118                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
 119                 return;
 120         }
 121
 122         /* looks like we're off in user-land, so let's walk all the
 123          * mappings of all our processes and see if we can't be a whee
 124          * bit more specific
 125          */
 126         write_lock_irqsave(&tasklist_lock, flags);
 127         for_each_process(p) {
 128                 mm = (in_atomic ? p->mm : get_task_mm(p));
 129                 if (!mm)
 130                         continue;
 131
 132                 vml = mm->context.vmlist;
 133                 while (vml) {
 134                         struct vm_area_struct *vma = vml->vma;
 135
 136                         if (address >= vma->vm_start && address < vma->vm_end) {
 137                                 char _tmpbuf[256];
 138                                 char *name = p->comm;
 139                                 struct file *file = vma->vm_file;
 140
 141                                 if (file)
 142                                         name = d_path(&file->f_path, _tmpbuf,
 143                                                       sizeof(_tmpbuf));
 144
 145                                 /* FLAT does not have its text aligned to the start of
 146                                  * the map while FDPIC ELF does ...
 147                                  */
 148
 149                                 /* before we can check flat/fdpic, we need to
 150                                  * make sure current is valid
 151                                  */
 152                                 if ((unsigned long)current >= FIXED_CODE_START &&
 153                                     !((unsigned long)current & 0x3)) {
 154                                         if (current->mm &&
 155                                             (address > current->mm->start_code) &&
 156                                             (address < current->mm->end_code))
 157                                                 offset = address - current->mm->start_code;
 158                                         else
 159                                                 offset = (address - vma->vm_start) +
 160                                                          (vma->vm_pgoff << PAGE_SHIFT);
 161
 162                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 163                                                 (void *)address, name, offset);
 164                                 } else
 165                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
 166                                                 (void *)address, name,
 167                                                 vma->vm_start, vma->vm_end);
 168
 169                                 if (!in_atomic)
 170                                         mmput(mm);
 171
 172                                 if (!strlen(buf))
 173                                         sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
 174
 175                                 goto done;
 176                         }
 177
 178                         vml = vml->next;
 179                 }
 180                 if (!in_atomic)
 181                         mmput(mm);
 182         }
 183
 184         /* we were unable to find this address anywhere */
 185         sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
 186
 187 done:
 188         write_unlock_irqrestore(&tasklist_lock, flags);
 189 }
 190
 191 asmlinkage void double_fault_c(struct pt_regs *fp)
 192 {
 193         console_verbose();
 194         oops_in_progress = 1;
 195         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 196 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 197         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 198                 char buf[150];
 199                 decode_address(buf, saved_retx);
 200                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 201                         (int)saved_seqstat & SEQSTAT_EXCAUSE, buf);
 202                 decode_address(buf, saved_dcplb_fault_addr);
 203                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 204                 decode_address(buf, saved_icplb_fault_addr);
 205                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 206
 207                 decode_address(buf, fp->retx);
 208                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n",
 209                         buf);
 210         } else
 211 #endif
 212         {
 213                 dump_bfin_process(fp);
 214                 dump_bfin_mem(fp);
 215                 show_regs(fp);
 216         }
 217         panic("Double Fault - unrecoverable event\n");
 218
 219 }
 220
 221 asmlinkage void trap_c(struct pt_regs *fp)
 222 {
 223 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 224         int j;
 225 #endif
 226         int sig = 0;
 227         siginfo_t info;
 228         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 229
 230         trace_buffer_save(j);
 231
 232         /* Important - be very careful dereferncing pointers - will lead to
 233          * double faults if the stack has become corrupt
 234          */
 235
 236         /* If the fault was caused by a kernel thread, or interrupt handler
 237          * we will kernel panic, so the system reboots.
 238          * If KGDB is enabled, don't set this for kernel breakpoints
 239         */
 240
 241         /* TODO: check to see if we are in some sort of deferred HWERR
 242          * that we should be able to recover from, not kernel panic
 243          */
 244         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
 245 #ifdef CONFIG_KGDB
 246                 && (trapnr != VEC_EXCPT02)
 247 #endif
 248         ){
 249                 console_verbose();
 250                 oops_in_progress = 1;
 251         } else if (current) {
 252                 if (current->mm == NULL) {
 253                         console_verbose();
 254                         oops_in_progress = 1;
 255                 }
 256         }
 257
 258         /* trap_c() will be called for exceptions. During exceptions
 259          * processing, the pc value should be set with retx value.
 260          * With this change we can cleanup some code in signal.c- TODO
 261          */
 262         fp->orig_pc = fp->retx;
 263         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 264                 trapnr, fp->ipend, fp->pc, fp->retx); */
 265
 266         /* send the appropriate signal to the user program */
 267         switch (trapnr) {
 268
 269         /* This table works in conjuction with the one in ./mach-common/entry.S
 270          * Some exceptions are handled there (in assembly, in exception space)
 271          * Some are handled here, (in C, in interrupt space)
 272          * Some, like CPLB, are handled in both, where the normal path is
 273          * handled in assembly/exception space, and the error path is handled
 274          * here
 275          */
 276
 277         /* 0x00 - Linux Syscall, getting here is an error */
 278         /* 0x01 - userspace gdb breakpoint, handled here */
 279         case VEC_EXCPT01:
 280                 info.si_code = TRAP_ILLTRAP;
 281                 sig = SIGTRAP;
 282                 CHK_DEBUGGER_TRAP_MAYBE();
 283                 /* Check if this is a breakpoint in kernel space */
 284                 if (fp->ipend & 0xffc0)
 285                         return;
 286                 else
 287                         break;
 288 #ifdef CONFIG_KGDB
 289         case VEC_EXCPT02 :               /* gdb connection */
 290                 info.si_code = TRAP_ILLTRAP;
 291                 sig = SIGTRAP;
 292                 CHK_DEBUGGER_TRAP();
 293                 return;
 294 #else
 295         /* 0x02 - User Defined, Caught by default */
 296 #endif
 297         /* 0x03 - User Defined, userspace stack overflow */
 298         case VEC_EXCPT03:
 299                 info.si_code = SEGV_STACKFLOW;
 300                 sig = SIGSEGV;
 301                 printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
 302                 CHK_DEBUGGER_TRAP_MAYBE();
 303                 break;
 304         /* 0x04 - User Defined */
 305         /* 0x05 - User Defined */
 306         /* 0x06 - User Defined */
 307         /* 0x07 - User Defined */
 308         /* 0x08 - User Defined */
 309         /* 0x09 - User Defined */
 310         /* 0x0A - User Defined */
 311         /* 0x0B - User Defined */
 312         /* 0x0C - User Defined */
 313         /* 0x0D - User Defined */
 314         /* 0x0E - User Defined */
 315         /* 0x0F - User Defined */
 316         /*
 317          * If we got here, it is most likely that someone was trying to use a
 318          * custom exception handler, and it is not actually installed properly
 319          */
 320         case VEC_EXCPT02:
 321         case VEC_EXCPT04 ... VEC_EXCPT15:
 322                 info.si_code = ILL_ILLPARAOP;
 323                 sig = SIGILL;
 324                 printk(KERN_NOTICE EXC_0x04(KERN_NOTICE));
 325                 CHK_DEBUGGER_TRAP_MAYBE();
 326                 break;
 327         /* 0x10 HW Single step, handled here */
 328         case VEC_STEP:
 329                 info.si_code = TRAP_STEP;
 330                 sig = SIGTRAP;
 331                 CHK_DEBUGGER_TRAP_MAYBE();
 332                 /* Check if this is a single step in kernel space */
 333                 if (fp->ipend & 0xffc0)
 334                         return;
 335                 else
 336                         break;
 337         /* 0x11 - Trace Buffer Full, handled here */
 338         case VEC_OVFLOW:
 339                 info.si_code = TRAP_TRACEFLOW;
 340                 sig = SIGTRAP;
 341                 printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
 342                 CHK_DEBUGGER_TRAP_MAYBE();
 343                 break;
 344         /* 0x12 - Reserved, Caught by default */
 345         /* 0x13 - Reserved, Caught by default */
 346         /* 0x14 - Reserved, Caught by default */
 347         /* 0x15 - Reserved, Caught by default */
 348         /* 0x16 - Reserved, Caught by default */
 349         /* 0x17 - Reserved, Caught by default */
 350         /* 0x18 - Reserved, Caught by default */
 351         /* 0x19 - Reserved, Caught by default */
 352         /* 0x1A - Reserved, Caught by default */
 353         /* 0x1B - Reserved, Caught by default */
 354         /* 0x1C - Reserved, Caught by default */
 355         /* 0x1D - Reserved, Caught by default */
 356         /* 0x1E - Reserved, Caught by default */
 357         /* 0x1F - Reserved, Caught by default */
 358         /* 0x20 - Reserved, Caught by default */
 359         /* 0x21 - Undefined Instruction, handled here */
 360         case VEC_UNDEF_I:
 361                 info.si_code = ILL_ILLOPC;
 362                 sig = SIGILL;
 363                 printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
 364                 CHK_DEBUGGER_TRAP_MAYBE();
 365                 break;
 366         /* 0x22 - Illegal Instruction Combination, handled here */
 367         case VEC_ILGAL_I:
 368                 info.si_code = ILL_ILLPARAOP;
 369                 sig = SIGILL;
 370                 printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
 371                 CHK_DEBUGGER_TRAP_MAYBE();
 372                 break;
 373         /* 0x23 - Data CPLB protection violation, handled here */
 374         case VEC_CPLB_VL:
 375                 info.si_code = ILL_CPLB_VI;
 376                 sig = SIGBUS;
 377                 printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
 378                 CHK_DEBUGGER_TRAP_MAYBE();
 379                 break;
 380         /* 0x24 - Data access misaligned, handled here */
 381         case VEC_MISALI_D:
 382                 info.si_code = BUS_ADRALN;
 383                 sig = SIGBUS;
 384                 printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
 385                 CHK_DEBUGGER_TRAP_MAYBE();
 386                 break;
 387         /* 0x25 - Unrecoverable Event, handled here */
 388         case VEC_UNCOV:
 389                 info.si_code = ILL_ILLEXCPT;
 390                 sig = SIGILL;
 391                 printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
 392                 CHK_DEBUGGER_TRAP_MAYBE();
 393                 break;
 394         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 395                 error case is handled here */
 396         case VEC_CPLB_M:
 397                 info.si_code = BUS_ADRALN;
 398                 sig = SIGBUS;
 399                 printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
 400                 break;
 401         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 402         case VEC_CPLB_MHIT:
 403                 info.si_code = ILL_CPLB_MULHIT;
 404                 sig = SIGSEGV;
 405 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 406                 if (saved_dcplb_fault_addr < FIXED_CODE_START)
 407                         printk(KERN_NOTICE "NULL pointer access\n");
 408                 else
 409 #endif
 410                         printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
 411                 CHK_DEBUGGER_TRAP_MAYBE();
 412                 break;
 413         /* 0x28 - Emulation Watchpoint, handled here */
 414         case VEC_WATCH:
 415                 info.si_code = TRAP_WATCHPT;
 416                 sig = SIGTRAP;
 417                 pr_debug(EXC_0x28(KERN_DEBUG));
 418                 CHK_DEBUGGER_TRAP_MAYBE();
 419                 /* Check if this is a watchpoint in kernel space */
 420                 if (fp->ipend & 0xffc0)
 421                         return;
 422                 else
 423                         break;
 424 #ifdef CONFIG_BF535
 425         /* 0x29 - Instruction fetch access error (535 only) */
 426         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 427                 info.si_code = BUS_OPFETCH;
 428                 sig = SIGBUS;
 429                 printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 430                 CHK_DEBUGGER_TRAP_MAYBE();
 431                 break;
 432 #else
 433         /* 0x29 - Reserved, Caught by default */
 434 #endif
 435         /* 0x2A - Instruction fetch misaligned, handled here */
 436         case VEC_MISALI_I:
 437                 info.si_code = BUS_ADRALN;
 438                 sig = SIGBUS;
 439                 printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
 440                 CHK_DEBUGGER_TRAP_MAYBE();
 441                 break;
 442         /* 0x2B - Instruction CPLB protection violation, handled here */
 443         case VEC_CPLB_I_VL:
 444                 info.si_code = ILL_CPLB_VI;
 445                 sig = SIGBUS;
 446                 printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
 447                 CHK_DEBUGGER_TRAP_MAYBE();
 448                 break;
 449         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 450         case VEC_CPLB_I_M:
 451                 info.si_code = ILL_CPLB_MISS;
 452                 sig = SIGBUS;
 453                 printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
 454                 break;
 455         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 456         case VEC_CPLB_I_MHIT:
 457                 info.si_code = ILL_CPLB_MULHIT;
 458                 sig = SIGSEGV;
 459 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 460                 if (saved_icplb_fault_addr < FIXED_CODE_START)
 461                         printk(KERN_NOTICE "Jump to NULL address\n");
 462                 else
 463 #endif
 464                         printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
 465                 CHK_DEBUGGER_TRAP_MAYBE();
 466                 break;
 467         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 468         case VEC_ILL_RES:
 469                 info.si_code = ILL_PRVOPC;
 470                 sig = SIGILL;
 471                 printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
 472                 CHK_DEBUGGER_TRAP_MAYBE();
 473                 break;
 474         /* 0x2F - Reserved, Caught by default */
 475         /* 0x30 - Reserved, Caught by default */
 476         /* 0x31 - Reserved, Caught by default */
 477         /* 0x32 - Reserved, Caught by default */
 478         /* 0x33 - Reserved, Caught by default */
 479         /* 0x34 - Reserved, Caught by default */
 480         /* 0x35 - Reserved, Caught by default */
 481         /* 0x36 - Reserved, Caught by default */
 482         /* 0x37 - Reserved, Caught by default */
 483         /* 0x38 - Reserved, Caught by default */
 484         /* 0x39 - Reserved, Caught by default */
 485         /* 0x3A - Reserved, Caught by default */
 486         /* 0x3B - Reserved, Caught by default */
 487         /* 0x3C - Reserved, Caught by default */
 488         /* 0x3D - Reserved, Caught by default */
 489         /* 0x3E - Reserved, Caught by default */
 490         /* 0x3F - Reserved, Caught by default */
 491         case VEC_HWERR:
 492                 info.si_code = BUS_ADRALN;
 493                 sig = SIGBUS;
 494                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 495                 /* System MMR Error */
 496                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 497                         info.si_code = BUS_ADRALN;
 498                         sig = SIGBUS;
 499                         printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
 500                         break;
 501                 /* External Memory Addressing Error */
 502                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 503                         info.si_code = BUS_ADRERR;
 504                         sig = SIGBUS;
 505                         printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
 506                         break;
 507                 /* Performance Monitor Overflow */
 508                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 509                         printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
 510                         break;
 511                 /* RAISE 5 instruction */
 512                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 513                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 514                         break;
 515                 default:        /* Reserved */
 516                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 517                         break;
 518                 }
 519                 CHK_DEBUGGER_TRAP_MAYBE();
 520                 break;
 521         /*
 522          * We should be handling all known exception types above,
 523          * if we get here we hit a reserved one, so panic
 524          */
 525         default:
 526                 oops_in_progress = 1;
 527                 info.si_code = ILL_ILLPARAOP;
 528                 sig = SIGILL;
 529                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 530                         (fp->seqstat & SEQSTAT_EXCAUSE));
 531                 CHK_DEBUGGER_TRAP_MAYBE();
 532                 break;
 533         }
 534
 535         BUG_ON(sig == 0);
 536
 537         if (sig != SIGTRAP) {
 538                 unsigned long *stack;
 539                 dump_bfin_process(fp);
 540                 dump_bfin_mem(fp);
 541                 show_regs(fp);
 542
 543                 /* Print out the trace buffer if it makes sense */
 544 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 545                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 546                         printk(KERN_NOTICE "No trace since you do not have "
 547                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 548                                 KERN_NOTICE "\n");
 549                 else
 550 #endif
 551                         dump_bfin_trace_buffer();
 552
 553                 if (oops_in_progress) {
 554                         /* Dump the current kernel stack */
 555                         printk(KERN_NOTICE "\n" KERN_NOTICE "Kernel Stack\n");
 556                         show_stack(current, NULL);
 557
 558                         print_modules();
 559 #ifndef CONFIG_ACCESS_CHECK
 560                         printk(KERN_EMERG "Please turn on "
 561                                "CONFIG_ACCESS_CHECK\n");
 562 #endif
 563                         panic("Kernel exception");
 564                 } else {
 565                         /* Dump the user space stack */
 566                         stack = (unsigned long *)rdusp();
 567                         printk(KERN_NOTICE "Userspace Stack\n");
 568                         show_stack(NULL, stack);
 569                 }
 570         }
 571
 572         info.si_signo = sig;
 573         info.si_errno = 0;
 574         info.si_addr = (void __user *)fp->pc;
 575         force_sig_info(sig, &info, current);
 576
 577         trace_buffer_restore(j);
 578         return;
 579 }
 580
 581 /* Typical exception handling routines  */
 582
 583 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 584
 585 /*
 586  * Similar to get_user, do some address checking, then dereference
 587  * Return true on sucess, false on bad address
 588  */
 589 bool get_instruction(unsigned short *val, unsigned short *address)
 590 {
 591
 592         unsigned long addr;
 593
 594         addr = (unsigned long)address;
 595
 596         /* Check for odd addresses */
 597         if (addr & 0x1)
 598                 return false;
 599
 600         /* Check that things do not wrap around */
 601         if (addr > (addr + 2))
 602                 return false;
 603
 604         /*
 605          * Since we are in exception context, we need to do a little address checking
 606          * We need to make sure we are only accessing valid memory, and
 607          * we don't read something in the async space that can hang forever
 608          */
 609         if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
 610 #if L2_LENGTH != 0
 611             (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
 612 #endif
 613             (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||
 614 #if L1_DATA_A_LENGTH != 0
 615             (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) ||
 616 #endif
 617 #if L1_DATA_B_LENGTH != 0
 618             (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) ||
 619 #endif
 620             (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) ||
 621             (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) &&
 622                addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) ||
 623             (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) &&
 624                addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) ||
 625             (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) &&
 626                addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) ||
 627             (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) &&
 628               addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) {
 629                 *val = *address;
 630                 return true;
 631         }
 632
 633 #if L1_CODE_LENGTH != 0
 634         if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) {
 635                 dma_memcpy(val, address, 2);
 636                 return true;
 637         }
 638 #endif
 639
 640
 641         return false;
 642 }
 643
 644 /*
 645  * decode the instruction if we are printing out the trace, as it
 646  * makes things easier to follow, without running it through objdump
 647  * These are the normal instructions which cause change of flow, which
 648  * would be at the source of the trace buffer
 649  */
 650 void decode_instruction(unsigned short *address)
 651 {
 652         unsigned short opcode;
 653
 654         if (get_instruction(&opcode, address)) {
 655                 if (opcode == 0x0010)
 656                         printk("RTS");
 657                 else if (opcode == 0x0011)
 658                         printk("RTI");
 659                 else if (opcode == 0x0012)
 660                         printk("RTX");
 661                 else if (opcode >= 0x0050 && opcode <= 0x0057)
 662                         printk("JUMP (P%i)", opcode & 7);
 663                 else if (opcode >= 0x0060 && opcode <= 0x0067)
 664                         printk("CALL (P%i)", opcode & 7);
 665                 else if (opcode >= 0x0070 && opcode <= 0x0077)
 666                         printk("CALL (PC+P%i)", opcode & 7);
 667                 else if (opcode >= 0x0080 && opcode <= 0x0087)
 668                         printk("JUMP (PC+P%i)", opcode & 7);
 669                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
 670                         printk("IF !CC JUMP");
 671                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
 672                         printk("IF CC JUMP");
 673                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
 674                         printk("JUMP.S");
 675                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
 676                         printk("LSETUP");
 677                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
 678                         printk("JUMP.L");
 679                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
 680                         printk("CALL pcrel");
 681                 else
 682                         printk("0x%04x", opcode);
 683         }
 684
 685 }
 686
 687 void dump_bfin_trace_buffer(void)
 688 {
 689 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 690         int tflags, i = 0;
 691         char buf[150];
 692         unsigned short *addr;
 693 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 694         int j, index;
 695 #endif
 696
 697         trace_buffer_save(tflags);
 698
 699         printk(KERN_NOTICE "Hardware Trace:\n");
 700
 701 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 702         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
 703 #endif
 704
 705         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 706                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 707                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 708                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 709                         addr = (unsigned short *)bfin_read_TBUF();
 710                         decode_address(buf, (unsigned long)addr);
 711                         printk(KERN_NOTICE "     Source : %s ", buf);
 712                         decode_instruction(addr);
 713                         printk("\n");
 714                 }
 715         }
 716
 717 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 718         if (trace_buff_offset)
 719                 index = trace_buff_offset / 4;
 720         else
 721                 index = EXPAND_LEN;
 722
 723         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 724         while (j) {
 725                 decode_address(buf, software_trace_buff[index]);
 726                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 727                 index -= 1;
 728                 if (index < 0 )
 729                         index = EXPAND_LEN;
 730                 decode_address(buf, software_trace_buff[index]);
 731                 printk(KERN_NOTICE "     Source : %s ", buf);
 732                 decode_instruction((unsigned short *)software_trace_buff[index]);
 733                 printk("\n");
 734                 index -= 1;
 735                 if (index < 0)
 736                         index = EXPAND_LEN;
 737                 j--;
 738                 i++;
 739         }
 740 #endif
 741
 742         trace_buffer_restore(tflags);
 743 #endif
 744 }
 745 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 746
 747 /*
 748  * Checks to see if the address pointed to is either a
 749  * 16-bit CALL instruction, or a 32-bit CALL instruction
 750  */
 751 bool is_bfin_call(unsigned short *addr)
 752 {
 753         unsigned short opcode = 0, *ins_addr;
 754         ins_addr = (unsigned short *)addr;
 755
 756         if (!get_instruction(&opcode, ins_addr))
 757                 return false;
 758
 759         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
 760             (opcode >= 0x0070 && opcode <= 0x0077))
 761                 return true;
 762
 763         ins_addr--;
 764         if (!get_instruction(&opcode, ins_addr))
 765                 return false;
 766
 767         if (opcode >= 0xE300 && opcode <= 0xE3FF)
 768                 return true;
 769
 770         return false;
 771
 772 }
 773 void show_stack(struct task_struct *task, unsigned long *stack)
 774 {
 775         unsigned int *addr, *endstack, *fp = 0, *frame;
 776         unsigned short *ins_addr;
 777         char buf[150];
 778         unsigned int i, j, ret_addr, frame_no = 0;
 779
 780         /*
 781          * If we have been passed a specific stack, use that one otherwise
 782          *    if we have been passed a task structure, use that, otherwise
 783          *    use the stack of where the variable "stack" exists
 784          */
 785
 786         if (stack == NULL) {
 787                 if (task) {
 788                         /* We know this is a kernel stack, so this is the start/end */
 789                         stack = (unsigned long *)task->thread.ksp;
 790                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
 791                 } else {
 792                         /* print out the existing stack info */
 793                         stack = (unsigned long *)&stack;
 794                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 795                 }
 796         } else
 797                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 798
 799         decode_address(buf, (unsigned int)stack);
 800         printk(KERN_NOTICE "Stack info:\n" KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
 801         addr = (unsigned int *)((unsigned int)stack & ~0x3F);
 802
 803         /* First thing is to look for a frame pointer */
 804         for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 805                 addr < endstack; addr++, i++) {
 806                 if (*addr & 0x1)
 807                         continue;
 808                 ins_addr = (unsigned short *)*addr;
 809                 ins_addr--;
 810                 if (is_bfin_call(ins_addr))
 811                         fp = addr - 1;
 812
 813                 if (fp) {
 814                         /* Let's check to see if it is a frame pointer */
 815                         while (fp >= (addr - 1) && fp < endstack && fp)
 816                                 fp = (unsigned int *)*fp;
 817                         if (fp == 0 || fp == endstack) {
 818                                 fp = addr - 1;
 819                                 break;
 820                         }
 821                         fp = 0;
 822                 }
 823         }
 824         if (fp) {
 825                 frame = fp;
 826                 printk(" FP: (0x%p)\n", fp);
 827         } else
 828                 frame = 0;
 829
 830         /*
 831          * Now that we think we know where things are, we
 832          * walk the stack again, this time printing things out
 833          * incase there is no frame pointer, we still look for
 834          * valid return addresses
 835          */
 836
 837         /* First time print out data, next time, print out symbols */
 838         for (j = 0; j <= 1; j++) {
 839                 if (j)
 840                         printk(KERN_NOTICE "Return addresses in stack:\n");
 841                 else
 842                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
 843
 844                 fp = frame;
 845                 frame_no = 0;
 846
 847                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 848                      addr <= endstack; addr++, i++) {
 849
 850                         ret_addr = 0;
 851                         if (!j && i % 8 == 0)
 852                                 printk("\n" KERN_NOTICE "%p:",addr);
 853
 854                         /* if it is an odd address, or zero, just skip it */
 855                         if (*addr & 0x1 || !*addr)
 856                                 goto print;
 857
 858                         ins_addr = (unsigned short *)*addr;
 859
 860                         /* Go back one instruction, and see if it is a CALL */
 861                         ins_addr--;
 862                         ret_addr = is_bfin_call(ins_addr);
 863  print:
 864                         if (!j && stack == (unsigned long *)addr)
 865                                 printk("[%08x]", *addr);
 866                         else if (ret_addr)
 867                                 if (j) {
 868                                         decode_address(buf, (unsigned int)*addr);
 869                                         if (frame == addr) {
 870                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
 871                                                 continue;
 872                                         }
 873                                         printk(KERN_NOTICE "    address : %s\n", buf);
 874                                 } else
 875                                         printk("<%08x>", *addr);
 876                         else if (fp == addr) {
 877                                 if (j)
 878                                         frame = addr+1;
 879                                 else
 880                                         printk("(%08x)", *addr);
 881
 882                                 fp = (unsigned int *)*addr;
 883                                 frame_no++;
 884
 885                         } else if (!j)
 886                                 printk(" %08x ", *addr);
 887                 }
 888                 if (!j)
 889                         printk("\n");
 890         }
 891
 892 }
 893
 894 void dump_stack(void)
 895 {
 896         unsigned long stack;
 897 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 898         int tflags;
 899 #endif
 900         trace_buffer_save(tflags);
 901         dump_bfin_trace_buffer();
 902         show_stack(current, &stack);
 903         trace_buffer_restore(tflags);
 904 }
 905 EXPORT_SYMBOL(dump_stack);
 906
 907 void dump_bfin_process(struct pt_regs *fp)
 908 {
 909         /* We should be able to look at fp->ipend, but we don't push it on the
 910          * stack all the time, so do this until we fix that */
 911         unsigned int context = bfin_read_IPEND();
 912
 913         if (oops_in_progress)
 914                 printk(KERN_EMERG "Kernel OOPS in progress\n");
 915
 916         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 917                 printk(KERN_NOTICE "HW Error context\n");
 918         else if (context & 0x0020)
 919                 printk(KERN_NOTICE "Deferred Exception context\n");
 920         else if (context & 0x3FC0)
 921                 printk(KERN_NOTICE "Interrupt context\n");
 922         else if (context & 0x4000)
 923                 printk(KERN_NOTICE "Deferred Interrupt context\n");
 924         else if (context & 0x8000)
 925                 printk(KERN_NOTICE "Kernel process context\n");
 926
 927         /* Because we are crashing, and pointers could be bad, we check things
 928          * pretty closely before we use them
 929          */
 930         if ((unsigned long)current >= FIXED_CODE_START &&
 931             !((unsigned long)current & 0x3) && current->pid) {
 932                 printk(KERN_NOTICE "CURRENT PROCESS:\n");
 933                 if (current->comm >= (char *)FIXED_CODE_START)
 934                         printk(KERN_NOTICE "COMM=%s PID=%d\n",
 935                                 current->comm, current->pid);
 936                 else
 937                         printk(KERN_NOTICE "COMM= invalid\n");
 938
 939                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
 940                         printk(KERN_NOTICE  "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
 941                                 KERN_NOTICE " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n"
 942                                 KERN_NOTICE "\n",
 943                                 (void *)current->mm->start_code,
 944                                 (void *)current->mm->end_code,
 945                                 (void *)current->mm->start_data,
 946                                 (void *)current->mm->end_data,
 947                                 (void *)current->mm->end_data,
 948                                 (void *)current->mm->brk,
 949                                 (void *)current->mm->start_stack);
 950                 else
 951                         printk(KERN_NOTICE "invalid mm\n");
 952         } else
 953                 printk(KERN_NOTICE "\n" KERN_NOTICE
 954                      "No Valid process in current context\n");
 955 }
 956
 957 void dump_bfin_mem(struct pt_regs *fp)
 958 {
 959         unsigned short *addr, *erraddr, val = 0, err = 0;
 960         char sti = 0, buf[6];
 961
 962         erraddr = (void *)fp->pc;
 963
 964         printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
 965
 966         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
 967              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
 968              addr++) {
 969                 if (!((unsigned long)addr & 0xF))
 970                         printk("\n" KERN_NOTICE "0x%p: ", addr);
 971
 972                 if (!get_instruction(&val, addr)) {
 973                                 val = 0;
 974                                 sprintf(buf, "????");
 975                 } else
 976                         sprintf(buf, "%04x", val);
 977
 978                 if (addr == erraddr) {
 979                         printk("[%s]", buf);
 980                         err = val;
 981                 } else
 982                         printk(" %s ", buf);
 983
 984                 /* Do any previous instructions turn on interrupts? */
 985                 if (addr <= erraddr &&                          /* in the past */
 986                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
 987                       val == 0x017b))                           /* [SP++] = RETI */
 988                         sti = 1;
 989         }
 990
 991         printk("\n");
 992
 993         /* Hardware error interrupts can be deferred */
 994         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
 995             oops_in_progress)){
 996                 printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
 997 #ifndef CONFIG_DEBUG_HWERR
 998                 printk(KERN_NOTICE "The remaining message may be meaningless\n"
 999                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
1000                          " better idea where it came from\n");
1001 #else
1002                 /* If we are handling only one peripheral interrupt
1003                  * and current mm and pid are valid, and the last error
1004                  * was in that user space process's text area
1005                  * print it out - because that is where the problem exists
1006                  */
1007                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1008                      (current->pid && current->mm)) {
1009                         /* And the last RETI points to the current userspace context */
1010                         if ((fp + 1)->pc >= current->mm->start_code &&
1011                             (fp + 1)->pc <= current->mm->end_code) {
1012                                 printk(KERN_NOTICE "It might be better to look around here : \n");
1013                                 printk(KERN_NOTICE "-------------------------------------------\n");
1014                                 show_regs(fp + 1);
1015                                 printk(KERN_NOTICE "-------------------------------------------\n");
1016                         }
1017                 }
1018 #endif
1019         }
1020 }
1021
1022 void show_regs(struct pt_regs *fp)
1023 {
1024         char buf [150];
1025         struct irqaction *action;
1026         unsigned int i;
1027         unsigned long flags;
1028
1029         printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
1030         printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
1031                 (long)fp->seqstat, fp->ipend, fp->syscfg);
1032         printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1033                 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1034         printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1035                 fp->seqstat & SEQSTAT_EXCAUSE);
1036         for (i = 6; i <= 15 ; i++) {
1037                 if (fp->ipend & (1 << i)) {
1038                         decode_address(buf, bfin_read32(EVT0 + 4*i));
1039                         printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1040                 }
1041         }
1042
1043         /* if no interrupts are going off, don't print this out */
1044         if (fp->ipend & ~0x3F) {
1045                 for (i = 0; i < (NR_IRQS - 1); i++) {
1046                         spin_lock_irqsave(&irq_desc[i].lock, flags);
1047                         action = irq_desc[i].action;
1048                         if (!action)
1049                                 goto unlock;
1050
1051                         decode_address(buf, (unsigned int)action->handler);
1052                         printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1053                         for (action = action->next; action; action = action->next) {
1054                                 decode_address(buf, (unsigned int)action->handler);
1055                                 printk(", %s", buf);
1056                         }
1057                         printk("\n");
1058 unlock:
1059                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1060                 }
1061         }
1062
1063         decode_address(buf, fp->rete);
1064         printk(KERN_NOTICE " RETE: %s\n", buf);
1065         decode_address(buf, fp->retn);
1066         printk(KERN_NOTICE " RETN: %s\n", buf);
1067         decode_address(buf, fp->retx);
1068         printk(KERN_NOTICE " RETX: %s\n", buf);
1069         decode_address(buf, fp->rets);
1070         printk(KERN_NOTICE " RETS: %s\n", buf);
1071         decode_address(buf, fp->pc);
1072         printk(KERN_NOTICE " PC  : %s\n", buf);
1073
1074         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1075             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1076                 decode_address(buf, saved_dcplb_fault_addr);
1077                 printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1078                 decode_address(buf, saved_icplb_fault_addr);
1079                 printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1080         }
1081
1082         printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
1083         printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1084                 fp->r0, fp->r1, fp->r2, fp->r3);
1085         printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1086                 fp->r4, fp->r5, fp->r6, fp->r7);
1087         printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1088                 fp->p0, fp->p1, fp->p2, fp->p3);
1089         printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1090                 fp->p4, fp->p5, fp->fp, (long)fp);
1091         printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1092                 fp->lb0, fp->lt0, fp->lc0);
1093         printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1094                 fp->lb1, fp->lt1, fp->lc1);
1095         printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1096                 fp->b0, fp->l0, fp->m0, fp->i0);
1097         printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1098                 fp->b1, fp->l1, fp->m1, fp->i1);
1099         printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1100                 fp->b2, fp->l2, fp->m2, fp->i2);
1101         printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1102                 fp->b3, fp->l3, fp->m3, fp->i3);
1103         printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1104                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1105
1106         printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1107                 rdusp(), fp->astat);
1108
1109         printk(KERN_NOTICE "\n");
1110 }
1111
1112 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1113 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1114 #endif
1115
1116 asmlinkage int sys_bfin_spinlock(int *spinlock)
1117 {
1118         int ret = 0;
1119         int tmp = 0;
1120
1121         local_irq_disable();
1122         ret = get_user(tmp, spinlock);
1123         if (ret == 0) {
1124                 if (tmp)
1125                         ret = 1;
1126                 tmp = 1;
1127                 put_user(tmp, spinlock);
1128         }
1129         local_irq_enable();
1130         return ret;
1131 }
1132
1133 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1134 {
1135         void (*curr_handler)(void);
1136
1137         if (exception > 0x3F)
1138                 return -EINVAL;
1139
1140         curr_handler = ex_table[exception];
1141
1142         if (curr_handler != ex_replaceable)
1143                 return -EBUSY;
1144
1145         ex_table[exception] = handler;
1146
1147         return 0;
1148 }
1149 EXPORT_SYMBOL(bfin_request_exception);
1150
1151 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1152 {
1153         void (*curr_handler)(void);
1154
1155         if (exception > 0x3F)
1156                 return -EINVAL;
1157
1158         curr_handler = ex_table[exception];
1159
1160         if (curr_handler != handler)
1161                 return -EBUSY;
1162
1163         ex_table[exception] = ex_replaceable;
1164
1165         return 0;
1166 }
1167 EXPORT_SYMBOL(bfin_free_exception);
1168
1169 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1170 {
1171         switch (cplb_panic) {
1172         case CPLB_NO_UNLOCKED:
1173                 printk(KERN_EMERG "All CPLBs are locked\n");
1174                 break;
1175         case CPLB_PROT_VIOL:
1176                 return;
1177         case CPLB_NO_ADDR_MATCH:
1178                 return;
1179         case CPLB_UNKNOWN_ERR:
1180                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1181                 break;
1182         }
1183
1184         oops_in_progress = 1;
1185
1186         dump_bfin_process(fp);
1187         dump_bfin_mem(fp);
1188         show_regs(fp);
1189         dump_stack();
1190         panic("Unrecoverable event\n");
1191 }