arch/blackfin/kernel/traps.c

   1 /*
   2  * Copyright 2004-2009 Analog Devices Inc.
   3  *
   4  * Licensed under the GPL-2 or later
   5  */
   6
   7 #include <linux/bug.h>
   8 #include <linux/uaccess.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/module.h>
  11 #include <linux/kallsyms.h>
  12 #include <linux/fs.h>
  13 #include <linux/rbtree.h>
  14 #include <asm/traps.h>
  15 #include <asm/cacheflush.h>
  16 #include <asm/cplb.h>
  17 #include <asm/dma.h>
  18 #include <asm/blackfin.h>
  19 #include <asm/irq_handler.h>
  20 #include <linux/irq.h>
  21 #include <asm/trace.h>
  22 #include <asm/fixed_code.h>
  23
  24 #ifdef CONFIG_KGDB
  25 # include <linux/kgdb.h>
  26
  27 # define CHK_DEBUGGER_TRAP() \
  28         do { \
  29                 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
  30         } while (0)
  31 # define CHK_DEBUGGER_TRAP_MAYBE() \
  32         do { \
  33                 if (kgdb_connected) \
  34                         CHK_DEBUGGER_TRAP(); \
  35         } while (0)
  36 #else
  37 # define CHK_DEBUGGER_TRAP() do { } while (0)
  38 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  39 #endif
  40
  41
  42 #ifdef CONFIG_DEBUG_VERBOSE
  43 #define verbose_printk(fmt, arg...) \
  44         printk(fmt, ##arg)
  45 #else
  46 #define verbose_printk(fmt, arg...) \
  47         ({ if (0) printk(fmt, ##arg); 0; })
  48 #endif
  49
  50 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
  51 u32 last_seqstat;
  52 #ifdef CONFIG_DEBUG_MMRS_MODULE
  53 EXPORT_SYMBOL(last_seqstat);
  54 #endif
  55 #endif
  56
  57 /* Initiate the event table handler */
  58 void __init trap_init(void)
  59 {
  60         CSYNC();
  61         bfin_write_EVT3(trap);
  62         CSYNC();
  63 }
  64
  65 static void decode_address(char *buf, unsigned long address)
  66 {
  67 #ifdef CONFIG_DEBUG_VERBOSE
  68         struct task_struct *p;
  69         struct mm_struct *mm;
  70         unsigned long flags, offset;
  71         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
  72         struct rb_node *n;
  73
  74 #ifdef CONFIG_KALLSYMS
  75         unsigned long symsize;
  76         const char *symname;
  77         char *modname;
  78         char *delim = ":";
  79         char namebuf[128];
  80 #endif
  81
  82         buf += sprintf(buf, "<0x%08lx> ", address);
  83
  84 #ifdef CONFIG_KALLSYMS
  85         /* look up the address and see if we are in kernel space */
  86         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
  87
  88         if (symname) {
  89                 /* yeah! kernel space! */
  90                 if (!modname)
  91                         modname = delim = "";
  92                 sprintf(buf, "{ %s%s%s%s + 0x%lx }",
  93                         delim, modname, delim, symname,
  94                         (unsigned long)offset);
  95                 return;
  96         }
  97 #endif
  98
  99         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 100                 /* Problem in fixed code section? */
 101                 strcat(buf, "/* Maybe fixed code section */");
 102                 return;
 103
 104         } else if (address < CONFIG_BOOT_LOAD) {
 105                 /* Problem somewhere before the kernel start address */
 106                 strcat(buf, "/* Maybe null pointer? */");
 107                 return;
 108
 109         } else if (address >= COREMMR_BASE) {
 110                 strcat(buf, "/* core mmrs */");
 111                 return;
 112
 113         } else if (address >= SYSMMR_BASE) {
 114                 strcat(buf, "/* system mmrs */");
 115                 return;
 116
 117         } else if (address >= L1_ROM_START && address < L1_ROM_START + L1_ROM_LENGTH) {
 118                 strcat(buf, "/* on-chip L1 ROM */");
 119                 return;
 120         }
 121
 122         /*
 123          * Don't walk any of the vmas if we are oopsing, it has been known
 124          * to cause problems - corrupt vmas (kernel crashes) cause double faults
 125          */
 126         if (oops_in_progress) {
 127                 strcat(buf, "/* kernel dynamic memory (maybe user-space) */");
 128                 return;
 129         }
 130
 131         /* looks like we're off in user-land, so let's walk all the
 132          * mappings of all our processes and see if we can't be a whee
 133          * bit more specific
 134          */
 135         write_lock_irqsave(&tasklist_lock, flags);
 136         for_each_process(p) {
 137                 mm = (in_atomic ? p->mm : get_task_mm(p));
 138                 if (!mm)
 139                         continue;
 140
 141                 if (!down_read_trylock(&mm->mmap_sem)) {
 142                         if (!in_atomic)
 143                                 mmput(mm);
 144                         continue;
 145                 }
 146
 147                 for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
 148                         struct vm_area_struct *vma;
 149
 150                         vma = rb_entry(n, struct vm_area_struct, vm_rb);
 151
 152                         if (address >= vma->vm_start && address < vma->vm_end) {
 153                                 char _tmpbuf[256];
 154                                 char *name = p->comm;
 155                                 struct file *file = vma->vm_file;
 156
 157                                 if (file) {
 158                                         char *d_name = d_path(&file->f_path, _tmpbuf,
 159                                                       sizeof(_tmpbuf));
 160                                         if (!IS_ERR(d_name))
 161                                                 name = d_name;
 162                                 }
 163
 164                                 /* FLAT does not have its text aligned to the start of
 165                                  * the map while FDPIC ELF does ...
 166                                  */
 167
 168                                 /* before we can check flat/fdpic, we need to
 169                                  * make sure current is valid
 170                                  */
 171                                 if ((unsigned long)current >= FIXED_CODE_START &&
 172                                     !((unsigned long)current & 0x3)) {
 173                                         if (current->mm &&
 174                                             (address > current->mm->start_code) &&
 175                                             (address < current->mm->end_code))
 176                                                 offset = address - current->mm->start_code;
 177                                         else
 178                                                 offset = (address - vma->vm_start) +
 179                                                          (vma->vm_pgoff << PAGE_SHIFT);
 180
 181                                         sprintf(buf, "[ %s + 0x%lx ]", name, offset);
 182                                 } else
 183                                         sprintf(buf, "[ %s vma:0x%lx-0x%lx]",
 184                                                 name, vma->vm_start, vma->vm_end);
 185
 186                                 up_read(&mm->mmap_sem);
 187                                 if (!in_atomic)
 188                                         mmput(mm);
 189
 190                                 if (buf[0] == '\0')
 191                                         sprintf(buf, "[ %s ] dynamic memory", name);
 192
 193                                 goto done;
 194                         }
 195                 }
 196
 197                 up_read(&mm->mmap_sem);
 198                 if (!in_atomic)
 199                         mmput(mm);
 200         }
 201
 202         /*
 203          * we were unable to find this address anywhere,
 204          * or some MMs were skipped because they were in use.
 205          */
 206         sprintf(buf, "/* kernel dynamic memory */");
 207
 208 done:
 209         write_unlock_irqrestore(&tasklist_lock, flags);
 210 #else
 211         sprintf(buf, " ");
 212 #endif
 213 }
 214
 215 asmlinkage void double_fault_c(struct pt_regs *fp)
 216 {
 217 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 218         int j;
 219         trace_buffer_save(j);
 220 #endif
 221
 222         console_verbose();
 223         oops_in_progress = 1;
 224 #ifdef CONFIG_DEBUG_VERBOSE
 225         printk(KERN_EMERG "Double Fault\n");
 226 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 227         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 228                 unsigned int cpu = raw_smp_processor_id();
 229                 char buf[150];
 230                 decode_address(buf, cpu_pda[cpu].retx_doublefault);
 231                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 232                         (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
 233                 decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
 234                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 235                 decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
 236                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 237
 238                 decode_address(buf, fp->retx);
 239                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
 240         } else
 241 #endif
 242         {
 243                 dump_bfin_process(fp);
 244                 dump_bfin_mem(fp);
 245                 show_regs(fp);
 246                 dump_bfin_trace_buffer();
 247         }
 248 #endif
 249         panic("Double Fault - unrecoverable event");
 250
 251 }
 252
 253 static int kernel_mode_regs(struct pt_regs *regs)
 254 {
 255         return regs->ipend & 0xffc0;
 256 }
 257
 258 asmlinkage notrace void trap_c(struct pt_regs *fp)
 259 {
 260 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 261         int j;
 262 #endif
 263         unsigned int cpu = raw_smp_processor_id();
 264         const char *strerror = NULL;
 265         int sig = 0;
 266         siginfo_t info;
 267         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 268
 269         trace_buffer_save(j);
 270 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
 271         last_seqstat = (u32)fp->seqstat;
 272 #endif
 273
 274         /* Important - be very careful dereferncing pointers - will lead to
 275          * double faults if the stack has become corrupt
 276          */
 277
 278         /* trap_c() will be called for exceptions. During exceptions
 279          * processing, the pc value should be set with retx value.
 280          * With this change we can cleanup some code in signal.c- TODO
 281          */
 282         fp->orig_pc = fp->retx;
 283         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 284                 trapnr, fp->ipend, fp->pc, fp->retx); */
 285
 286         /* send the appropriate signal to the user program */
 287         switch (trapnr) {
 288
 289         /* This table works in conjuction with the one in ./mach-common/entry.S
 290          * Some exceptions are handled there (in assembly, in exception space)
 291          * Some are handled here, (in C, in interrupt space)
 292          * Some, like CPLB, are handled in both, where the normal path is
 293          * handled in assembly/exception space, and the error path is handled
 294          * here
 295          */
 296
 297         /* 0x00 - Linux Syscall, getting here is an error */
 298         /* 0x01 - userspace gdb breakpoint, handled here */
 299         case VEC_EXCPT01:
 300                 info.si_code = TRAP_ILLTRAP;
 301                 sig = SIGTRAP;
 302                 CHK_DEBUGGER_TRAP_MAYBE();
 303                 /* Check if this is a breakpoint in kernel space */
 304                 if (kernel_mode_regs(fp))
 305                         goto traps_done;
 306                 else
 307                         break;
 308         /* 0x03 - User Defined, userspace stack overflow */
 309         case VEC_EXCPT03:
 310                 info.si_code = SEGV_STACKFLOW;
 311                 sig = SIGSEGV;
 312                 strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
 313                 CHK_DEBUGGER_TRAP_MAYBE();
 314                 break;
 315         /* 0x02 - KGDB initial connection and break signal trap */
 316         case VEC_EXCPT02:
 317 #ifdef CONFIG_KGDB
 318                 info.si_code = TRAP_ILLTRAP;
 319                 sig = SIGTRAP;
 320                 CHK_DEBUGGER_TRAP();
 321                 goto traps_done;
 322 #endif
 323         /* 0x04 - User Defined */
 324         /* 0x05 - User Defined */
 325         /* 0x06 - User Defined */
 326         /* 0x07 - User Defined */
 327         /* 0x08 - User Defined */
 328         /* 0x09 - User Defined */
 329         /* 0x0A - User Defined */
 330         /* 0x0B - User Defined */
 331         /* 0x0C - User Defined */
 332         /* 0x0D - User Defined */
 333         /* 0x0E - User Defined */
 334         /* 0x0F - User Defined */
 335         /* If we got here, it is most likely that someone was trying to use a
 336          * custom exception handler, and it is not actually installed properly
 337          */
 338         case VEC_EXCPT04 ... VEC_EXCPT15:
 339                 info.si_code = ILL_ILLPARAOP;
 340                 sig = SIGILL;
 341                 strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
 342                 CHK_DEBUGGER_TRAP_MAYBE();
 343                 break;
 344         /* 0x10 HW Single step, handled here */
 345         case VEC_STEP:
 346                 info.si_code = TRAP_STEP;
 347                 sig = SIGTRAP;
 348                 CHK_DEBUGGER_TRAP_MAYBE();
 349                 /* Check if this is a single step in kernel space */
 350                 if (kernel_mode_regs(fp))
 351                         goto traps_done;
 352                 else
 353                         break;
 354         /* 0x11 - Trace Buffer Full, handled here */
 355         case VEC_OVFLOW:
 356                 info.si_code = TRAP_TRACEFLOW;
 357                 sig = SIGTRAP;
 358                 strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
 359                 CHK_DEBUGGER_TRAP_MAYBE();
 360                 break;
 361         /* 0x12 - Reserved, Caught by default */
 362         /* 0x13 - Reserved, Caught by default */
 363         /* 0x14 - Reserved, Caught by default */
 364         /* 0x15 - Reserved, Caught by default */
 365         /* 0x16 - Reserved, Caught by default */
 366         /* 0x17 - Reserved, Caught by default */
 367         /* 0x18 - Reserved, Caught by default */
 368         /* 0x19 - Reserved, Caught by default */
 369         /* 0x1A - Reserved, Caught by default */
 370         /* 0x1B - Reserved, Caught by default */
 371         /* 0x1C - Reserved, Caught by default */
 372         /* 0x1D - Reserved, Caught by default */
 373         /* 0x1E - Reserved, Caught by default */
 374         /* 0x1F - Reserved, Caught by default */
 375         /* 0x20 - Reserved, Caught by default */
 376         /* 0x21 - Undefined Instruction, handled here */
 377         case VEC_UNDEF_I:
 378 #ifdef CONFIG_BUG
 379                 if (kernel_mode_regs(fp)) {
 380                         switch (report_bug(fp->pc, fp)) {
 381                         case BUG_TRAP_TYPE_NONE:
 382                                 break;
 383                         case BUG_TRAP_TYPE_WARN:
 384                                 dump_bfin_trace_buffer();
 385                                 fp->pc += 2;
 386                                 goto traps_done;
 387                         case BUG_TRAP_TYPE_BUG:
 388                                 /* call to panic() will dump trace, and it is
 389                                  * off at this point, so it won't be clobbered
 390                                  */
 391                                 panic("BUG()");
 392                         }
 393                 }
 394 #endif
 395                 info.si_code = ILL_ILLOPC;
 396                 sig = SIGILL;
 397                 strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
 398                 CHK_DEBUGGER_TRAP_MAYBE();
 399                 break;
 400         /* 0x22 - Illegal Instruction Combination, handled here */
 401         case VEC_ILGAL_I:
 402                 info.si_code = ILL_ILLPARAOP;
 403                 sig = SIGILL;
 404                 strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
 405                 CHK_DEBUGGER_TRAP_MAYBE();
 406                 break;
 407         /* 0x23 - Data CPLB protection violation, handled here */
 408         case VEC_CPLB_VL:
 409                 info.si_code = ILL_CPLB_VI;
 410                 sig = SIGSEGV;
 411                 strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
 412                 CHK_DEBUGGER_TRAP_MAYBE();
 413                 break;
 414         /* 0x24 - Data access misaligned, handled here */
 415         case VEC_MISALI_D:
 416                 info.si_code = BUS_ADRALN;
 417                 sig = SIGBUS;
 418                 strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
 419                 CHK_DEBUGGER_TRAP_MAYBE();
 420                 break;
 421         /* 0x25 - Unrecoverable Event, handled here */
 422         case VEC_UNCOV:
 423                 info.si_code = ILL_ILLEXCPT;
 424                 sig = SIGILL;
 425                 strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
 426                 CHK_DEBUGGER_TRAP_MAYBE();
 427                 break;
 428         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 429                 error case is handled here */
 430         case VEC_CPLB_M:
 431                 info.si_code = BUS_ADRALN;
 432                 sig = SIGBUS;
 433                 strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
 434                 break;
 435         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 436         case VEC_CPLB_MHIT:
 437                 info.si_code = ILL_CPLB_MULHIT;
 438                 sig = SIGSEGV;
 439 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 440                 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
 441                         strerror = KERN_NOTICE "NULL pointer access\n";
 442                 else
 443 #endif
 444                         strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
 445                 CHK_DEBUGGER_TRAP_MAYBE();
 446                 break;
 447         /* 0x28 - Emulation Watchpoint, handled here */
 448         case VEC_WATCH:
 449                 info.si_code = TRAP_WATCHPT;
 450                 sig = SIGTRAP;
 451                 pr_debug(EXC_0x28(KERN_DEBUG));
 452                 CHK_DEBUGGER_TRAP_MAYBE();
 453                 /* Check if this is a watchpoint in kernel space */
 454                 if (kernel_mode_regs(fp))
 455                         goto traps_done;
 456                 else
 457                         break;
 458 #ifdef CONFIG_BF535
 459         /* 0x29 - Instruction fetch access error (535 only) */
 460         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 461                 info.si_code = BUS_OPFETCH;
 462                 sig = SIGBUS;
 463                 strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
 464                 CHK_DEBUGGER_TRAP_MAYBE();
 465                 break;
 466 #else
 467         /* 0x29 - Reserved, Caught by default */
 468 #endif
 469         /* 0x2A - Instruction fetch misaligned, handled here */
 470         case VEC_MISALI_I:
 471                 info.si_code = BUS_ADRALN;
 472                 sig = SIGBUS;
 473                 strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
 474                 CHK_DEBUGGER_TRAP_MAYBE();
 475                 break;
 476         /* 0x2B - Instruction CPLB protection violation, handled here */
 477         case VEC_CPLB_I_VL:
 478                 info.si_code = ILL_CPLB_VI;
 479                 sig = SIGBUS;
 480                 strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
 481                 CHK_DEBUGGER_TRAP_MAYBE();
 482                 break;
 483         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 484         case VEC_CPLB_I_M:
 485                 info.si_code = ILL_CPLB_MISS;
 486                 sig = SIGBUS;
 487                 strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
 488                 break;
 489         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 490         case VEC_CPLB_I_MHIT:
 491                 info.si_code = ILL_CPLB_MULHIT;
 492                 sig = SIGSEGV;
 493 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 494                 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
 495                         strerror = KERN_NOTICE "Jump to NULL address\n";
 496                 else
 497 #endif
 498                         strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
 499                 CHK_DEBUGGER_TRAP_MAYBE();
 500                 break;
 501         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 502         case VEC_ILL_RES:
 503                 info.si_code = ILL_PRVOPC;
 504                 sig = SIGILL;
 505                 strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
 506                 CHK_DEBUGGER_TRAP_MAYBE();
 507                 break;
 508         /* 0x2F - Reserved, Caught by default */
 509         /* 0x30 - Reserved, Caught by default */
 510         /* 0x31 - Reserved, Caught by default */
 511         /* 0x32 - Reserved, Caught by default */
 512         /* 0x33 - Reserved, Caught by default */
 513         /* 0x34 - Reserved, Caught by default */
 514         /* 0x35 - Reserved, Caught by default */
 515         /* 0x36 - Reserved, Caught by default */
 516         /* 0x37 - Reserved, Caught by default */
 517         /* 0x38 - Reserved, Caught by default */
 518         /* 0x39 - Reserved, Caught by default */
 519         /* 0x3A - Reserved, Caught by default */
 520         /* 0x3B - Reserved, Caught by default */
 521         /* 0x3C - Reserved, Caught by default */
 522         /* 0x3D - Reserved, Caught by default */
 523         /* 0x3E - Reserved, Caught by default */
 524         /* 0x3F - Reserved, Caught by default */
 525         case VEC_HWERR:
 526                 info.si_code = BUS_ADRALN;
 527                 sig = SIGBUS;
 528                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 529                 /* System MMR Error */
 530                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 531                         info.si_code = BUS_ADRALN;
 532                         sig = SIGBUS;
 533                         strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
 534                         break;
 535                 /* External Memory Addressing Error */
 536                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 537                         if (ANOMALY_05000310) {
 538                                 static unsigned long anomaly_rets;
 539
 540                                 if ((fp->pc >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
 541                                     (fp->pc < (L1_CODE_START + L1_CODE_LENGTH))) {
 542                                         /*
 543                                          * A false hardware error will happen while fetching at
 544                                          * the L1 instruction SRAM boundary.  Ignore it.
 545                                          */
 546                                         anomaly_rets = fp->rets;
 547                                         goto traps_done;
 548                                 } else if (fp->rets == anomaly_rets) {
 549                                         /*
 550                                          * While boundary code returns to a function, at the ret
 551                                          * point, a new false hardware error might occur too based
 552                                          * on tests.  Ignore it too.
 553                                          */
 554                                         goto traps_done;
 555                                 } else if ((fp->rets >= (L1_CODE_START + L1_CODE_LENGTH - 512)) &&
 556                                            (fp->rets < (L1_CODE_START + L1_CODE_LENGTH))) {
 557                                         /*
 558                                          * If boundary code calls a function, at the entry point,
 559                                          * a new false hardware error maybe happen based on tests.
 560                                          * Ignore it too.
 561                                          */
 562                                         goto traps_done;
 563                                 } else
 564                                         anomaly_rets = 0;
 565                         }
 566
 567                         info.si_code = BUS_ADRERR;
 568                         sig = SIGBUS;
 569                         strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
 570                         break;
 571                 /* Performance Monitor Overflow */
 572                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 573                         strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
 574                         break;
 575                 /* RAISE 5 instruction */
 576                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 577                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 578                         break;
 579                 default:        /* Reserved */
 580                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 581                         break;
 582                 }
 583                 CHK_DEBUGGER_TRAP_MAYBE();
 584                 break;
 585         /*
 586          * We should be handling all known exception types above,
 587          * if we get here we hit a reserved one, so panic
 588          */
 589         default:
 590                 info.si_code = ILL_ILLPARAOP;
 591                 sig = SIGILL;
 592                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 593                         (fp->seqstat & SEQSTAT_EXCAUSE));
 594                 CHK_DEBUGGER_TRAP_MAYBE();
 595                 break;
 596         }
 597
 598         BUG_ON(sig == 0);
 599
 600         /* If the fault was caused by a kernel thread, or interrupt handler
 601          * we will kernel panic, so the system reboots.
 602          */
 603         if (kernel_mode_regs(fp) || (current && !current->mm)) {
 604                 console_verbose();
 605                 oops_in_progress = 1;
 606         }
 607
 608         if (sig != SIGTRAP) {
 609                 if (strerror)
 610                         verbose_printk(strerror);
 611
 612                 dump_bfin_process(fp);
 613                 dump_bfin_mem(fp);
 614                 show_regs(fp);
 615
 616                 /* Print out the trace buffer if it makes sense */
 617 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 618                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 619                         verbose_printk(KERN_NOTICE "No trace since you do not have "
 620                                "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n");
 621                 else
 622 #endif
 623                         dump_bfin_trace_buffer();
 624
 625                 if (oops_in_progress) {
 626                         /* Dump the current kernel stack */
 627                         verbose_printk(KERN_NOTICE "Kernel Stack\n");
 628                         show_stack(current, NULL);
 629                         print_modules();
 630 #ifndef CONFIG_ACCESS_CHECK
 631                         verbose_printk(KERN_EMERG "Please turn on "
 632                                "CONFIG_ACCESS_CHECK\n");
 633 #endif
 634                         panic("Kernel exception");
 635                 } else {
 636 #ifdef CONFIG_DEBUG_VERBOSE
 637                         unsigned long *stack;
 638                         /* Dump the user space stack */
 639                         stack = (unsigned long *)rdusp();
 640                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
 641                         show_stack(NULL, stack);
 642 #endif
 643                 }
 644         }
 645
 646 #ifdef CONFIG_IPIPE
 647         if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
 648 #endif
 649         {
 650                 info.si_signo = sig;
 651                 info.si_errno = 0;
 652                 switch (trapnr) {
 653                 case VEC_CPLB_VL:
 654                 case VEC_MISALI_D:
 655                 case VEC_CPLB_M:
 656                 case VEC_CPLB_MHIT:
 657                         info.si_addr = (void __user *)cpu_pda[cpu].dcplb_fault_addr;
 658                         break;
 659                 default:
 660                         info.si_addr = (void __user *)fp->pc;
 661                         break;
 662                 }
 663                 force_sig_info(sig, &info, current);
 664         }
 665
 666         if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
 667             (ANOMALY_05000281 && trapnr == VEC_HWERR) ||
 668             (ANOMALY_05000189 && (trapnr == VEC_CPLB_I_VL || trapnr == VEC_CPLB_VL)))
 669                 fp->pc = SAFE_USER_INSTRUCTION;
 670
 671  traps_done:
 672         trace_buffer_restore(j);
 673 }
 674
 675 /* Typical exception handling routines  */
 676
 677 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 678
 679 /*
 680  * Similar to get_user, do some address checking, then dereference
 681  * Return true on success, false on bad address
 682  */
 683 static bool get_instruction(unsigned short *val, unsigned short *address)
 684 {
 685         unsigned long addr = (unsigned long)address;
 686
 687         /* Check for odd addresses */
 688         if (addr & 0x1)
 689                 return false;
 690
 691         /* MMR region will never have instructions */
 692         if (addr >= SYSMMR_BASE)
 693                 return false;
 694
 695         switch (bfin_mem_access_type(addr, 2)) {
 696                 case BFIN_MEM_ACCESS_CORE:
 697                 case BFIN_MEM_ACCESS_CORE_ONLY:
 698                         *val = *address;
 699                         return true;
 700                 case BFIN_MEM_ACCESS_DMA:
 701                         dma_memcpy(val, address, 2);
 702                         return true;
 703                 case BFIN_MEM_ACCESS_ITEST:
 704                         isram_memcpy(val, address, 2);
 705                         return true;
 706                 default: /* invalid access */
 707                         return false;
 708         }
 709 }
 710
 711 /*
 712  * decode the instruction if we are printing out the trace, as it
 713  * makes things easier to follow, without running it through objdump
 714  * These are the normal instructions which cause change of flow, which
 715  * would be at the source of the trace buffer
 716  */
 717 #if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
 718 static void decode_instruction(unsigned short *address)
 719 {
 720         unsigned short opcode;
 721
 722         if (get_instruction(&opcode, address)) {
 723                 if (opcode == 0x0010)
 724                         verbose_printk("RTS");
 725                 else if (opcode == 0x0011)
 726                         verbose_printk("RTI");
 727                 else if (opcode == 0x0012)
 728                         verbose_printk("RTX");
 729                 else if (opcode == 0x0013)
 730                         verbose_printk("RTN");
 731                 else if (opcode == 0x0014)
 732                         verbose_printk("RTE");
 733                 else if (opcode == 0x0025)
 734                         verbose_printk("EMUEXCPT");
 735                 else if (opcode >= 0x0040 && opcode <= 0x0047)
 736                         verbose_printk("STI R%i", opcode & 7);
 737                 else if (opcode >= 0x0050 && opcode <= 0x0057)
 738                         verbose_printk("JUMP (P%i)", opcode & 7);
 739                 else if (opcode >= 0x0060 && opcode <= 0x0067)
 740                         verbose_printk("CALL (P%i)", opcode & 7);
 741                 else if (opcode >= 0x0070 && opcode <= 0x0077)
 742                         verbose_printk("CALL (PC+P%i)", opcode & 7);
 743                 else if (opcode >= 0x0080 && opcode <= 0x0087)
 744                         verbose_printk("JUMP (PC+P%i)", opcode & 7);
 745                 else if (opcode >= 0x0090 && opcode <= 0x009F)
 746                         verbose_printk("RAISE 0x%x", opcode & 0xF);
 747                 else if (opcode >= 0x00A0 && opcode <= 0x00AF)
 748                         verbose_printk("EXCPT 0x%x", opcode & 0xF);
 749                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
 750                         verbose_printk("IF !CC JUMP");
 751                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
 752                         verbose_printk("IF CC JUMP");
 753                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
 754                         verbose_printk("JUMP.S");
 755                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
 756                         verbose_printk("LSETUP");
 757                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
 758                         verbose_printk("JUMP.L");
 759                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
 760                         verbose_printk("CALL pcrel");
 761                 else
 762                         verbose_printk("0x%04x", opcode);
 763         }
 764
 765 }
 766 #endif
 767
 768 void dump_bfin_trace_buffer(void)
 769 {
 770 #ifdef CONFIG_DEBUG_VERBOSE
 771 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 772         int tflags, i = 0;
 773         char buf[150];
 774         unsigned short *addr;
 775 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 776         int j, index;
 777 #endif
 778
 779         trace_buffer_save(tflags);
 780
 781         printk(KERN_NOTICE "Hardware Trace:\n");
 782
 783 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 784         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
 785 #endif
 786
 787         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 788                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 789                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 790                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 791                         addr = (unsigned short *)bfin_read_TBUF();
 792                         decode_address(buf, (unsigned long)addr);
 793                         printk(KERN_NOTICE "     Source : %s ", buf);
 794                         decode_instruction(addr);
 795                         printk("\n");
 796                 }
 797         }
 798
 799 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 800         if (trace_buff_offset)
 801                 index = trace_buff_offset / 4;
 802         else
 803                 index = EXPAND_LEN;
 804
 805         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 806         while (j) {
 807                 decode_address(buf, software_trace_buff[index]);
 808                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 809                 index -= 1;
 810                 if (index < 0 )
 811                         index = EXPAND_LEN;
 812                 decode_address(buf, software_trace_buff[index]);
 813                 printk(KERN_NOTICE "     Source : %s ", buf);
 814                 decode_instruction((unsigned short *)software_trace_buff[index]);
 815                 printk("\n");
 816                 index -= 1;
 817                 if (index < 0)
 818                         index = EXPAND_LEN;
 819                 j--;
 820                 i++;
 821         }
 822 #endif
 823
 824         trace_buffer_restore(tflags);
 825 #endif
 826 #endif
 827 }
 828 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 829
 830 #ifdef CONFIG_BUG
 831 int is_valid_bugaddr(unsigned long addr)
 832 {
 833         unsigned short opcode;
 834
 835         if (!get_instruction(&opcode, (unsigned short *)addr))
 836                 return 0;
 837
 838         return opcode == BFIN_BUG_OPCODE;
 839 }
 840 #endif
 841
 842 /*
 843  * Checks to see if the address pointed to is either a
 844  * 16-bit CALL instruction, or a 32-bit CALL instruction
 845  */
 846 static bool is_bfin_call(unsigned short *addr)
 847 {
 848         unsigned short opcode = 0, *ins_addr;
 849         ins_addr = (unsigned short *)addr;
 850
 851         if (!get_instruction(&opcode, ins_addr))
 852                 return false;
 853
 854         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
 855             (opcode >= 0x0070 && opcode <= 0x0077))
 856                 return true;
 857
 858         ins_addr--;
 859         if (!get_instruction(&opcode, ins_addr))
 860                 return false;
 861
 862         if (opcode >= 0xE300 && opcode <= 0xE3FF)
 863                 return true;
 864
 865         return false;
 866
 867 }
 868
 869 void show_stack(struct task_struct *task, unsigned long *stack)
 870 {
 871 #ifdef CONFIG_PRINTK
 872         unsigned int *addr, *endstack, *fp = 0, *frame;
 873         unsigned short *ins_addr;
 874         char buf[150];
 875         unsigned int i, j, ret_addr, frame_no = 0;
 876
 877         /*
 878          * If we have been passed a specific stack, use that one otherwise
 879          *    if we have been passed a task structure, use that, otherwise
 880          *    use the stack of where the variable "stack" exists
 881          */
 882
 883         if (stack == NULL) {
 884                 if (task) {
 885                         /* We know this is a kernel stack, so this is the start/end */
 886                         stack = (unsigned long *)task->thread.ksp;
 887                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
 888                 } else {
 889                         /* print out the existing stack info */
 890                         stack = (unsigned long *)&stack;
 891                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 892                 }
 893         } else
 894                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 895
 896         printk(KERN_NOTICE "Stack info:\n");
 897         decode_address(buf, (unsigned int)stack);
 898         printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
 899
 900         if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
 901                 printk(KERN_NOTICE "Invalid stack pointer\n");
 902                 return;
 903         }
 904
 905         /* First thing is to look for a frame pointer */
 906         for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
 907                 if (*addr & 0x1)
 908                         continue;
 909                 ins_addr = (unsigned short *)*addr;
 910                 ins_addr--;
 911                 if (is_bfin_call(ins_addr))
 912                         fp = addr - 1;
 913
 914                 if (fp) {
 915                         /* Let's check to see if it is a frame pointer */
 916                         while (fp >= (addr - 1) && fp < endstack
 917                                && fp && ((unsigned int) fp & 0x3) == 0)
 918                                 fp = (unsigned int *)*fp;
 919                         if (fp == 0 || fp == endstack) {
 920                                 fp = addr - 1;
 921                                 break;
 922                         }
 923                         fp = 0;
 924                 }
 925         }
 926         if (fp) {
 927                 frame = fp;
 928                 printk(KERN_NOTICE " FP: (0x%p)\n", fp);
 929         } else
 930                 frame = 0;
 931
 932         /*
 933          * Now that we think we know where things are, we
 934          * walk the stack again, this time printing things out
 935          * incase there is no frame pointer, we still look for
 936          * valid return addresses
 937          */
 938
 939         /* First time print out data, next time, print out symbols */
 940         for (j = 0; j <= 1; j++) {
 941                 if (j)
 942                         printk(KERN_NOTICE "Return addresses in stack:\n");
 943                 else
 944                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
 945
 946                 fp = frame;
 947                 frame_no = 0;
 948
 949                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 950                      addr < endstack; addr++, i++) {
 951
 952                         ret_addr = 0;
 953                         if (!j && i % 8 == 0)
 954                                 printk(KERN_NOTICE "%p:",addr);
 955
 956                         /* if it is an odd address, or zero, just skip it */
 957                         if (*addr & 0x1 || !*addr)
 958                                 goto print;
 959
 960                         ins_addr = (unsigned short *)*addr;
 961
 962                         /* Go back one instruction, and see if it is a CALL */
 963                         ins_addr--;
 964                         ret_addr = is_bfin_call(ins_addr);
 965  print:
 966                         if (!j && stack == (unsigned long *)addr)
 967                                 printk("[%08x]", *addr);
 968                         else if (ret_addr)
 969                                 if (j) {
 970                                         decode_address(buf, (unsigned int)*addr);
 971                                         if (frame == addr) {
 972                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
 973                                                 continue;
 974                                         }
 975                                         printk(KERN_NOTICE "    address : %s\n", buf);
 976                                 } else
 977                                         printk("<%08x>", *addr);
 978                         else if (fp == addr) {
 979                                 if (j)
 980                                         frame = addr+1;
 981                                 else
 982                                         printk("(%08x)", *addr);
 983
 984                                 fp = (unsigned int *)*addr;
 985                                 frame_no++;
 986
 987                         } else if (!j)
 988                                 printk(" %08x ", *addr);
 989                 }
 990                 if (!j)
 991                         printk("\n");
 992         }
 993 #endif
 994 }
 995 EXPORT_SYMBOL(show_stack);
 996
 997 void dump_stack(void)
 998 {
 999         unsigned long stack;
1000 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
1001         int tflags;
1002 #endif
1003         trace_buffer_save(tflags);
1004         dump_bfin_trace_buffer();
1005         show_stack(current, &stack);
1006         trace_buffer_restore(tflags);
1007 }
1008 EXPORT_SYMBOL(dump_stack);
1009
1010 void dump_bfin_process(struct pt_regs *fp)
1011 {
1012 #ifdef CONFIG_DEBUG_VERBOSE
1013         /* We should be able to look at fp->ipend, but we don't push it on the
1014          * stack all the time, so do this until we fix that */
1015         unsigned int context = bfin_read_IPEND();
1016
1017         if (oops_in_progress)
1018                 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
1019
1020         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
1021                 verbose_printk(KERN_NOTICE "HW Error context\n");
1022         else if (context & 0x0020)
1023                 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
1024         else if (context & 0x3FC0)
1025                 verbose_printk(KERN_NOTICE "Interrupt context\n");
1026         else if (context & 0x4000)
1027                 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
1028         else if (context & 0x8000)
1029                 verbose_printk(KERN_NOTICE "Kernel process context\n");
1030
1031         /* Because we are crashing, and pointers could be bad, we check things
1032          * pretty closely before we use them
1033          */
1034         if ((unsigned long)current >= FIXED_CODE_START &&
1035             !((unsigned long)current & 0x3) && current->pid) {
1036                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
1037                 if (current->comm >= (char *)FIXED_CODE_START)
1038                         verbose_printk(KERN_NOTICE "COMM=%s PID=%d",
1039                                 current->comm, current->pid);
1040                 else
1041                         verbose_printk(KERN_NOTICE "COMM= invalid");
1042
1043                 printk(KERN_CONT " CPU=%d\n", current_thread_info()->cpu);
1044                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
1045                         verbose_printk(KERN_NOTICE
1046                                 "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
1047                                 " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n\n",
1048                                 (void *)current->mm->start_code,
1049                                 (void *)current->mm->end_code,
1050                                 (void *)current->mm->start_data,
1051                                 (void *)current->mm->end_data,
1052                                 (void *)current->mm->end_data,
1053                                 (void *)current->mm->brk,
1054                                 (void *)current->mm->start_stack);
1055                 else
1056                         verbose_printk(KERN_NOTICE "invalid mm\n");
1057         } else
1058                 verbose_printk(KERN_NOTICE
1059                                "No Valid process in current context\n");
1060 #endif
1061 }
1062
1063 void dump_bfin_mem(struct pt_regs *fp)
1064 {
1065 #ifdef CONFIG_DEBUG_VERBOSE
1066         unsigned short *addr, *erraddr, val = 0, err = 0;
1067         char sti = 0, buf[6];
1068
1069         erraddr = (void *)fp->pc;
1070
1071         verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
1072
1073         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
1074              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
1075              addr++) {
1076                 if (!((unsigned long)addr & 0xF))
1077                         verbose_printk(KERN_NOTICE "0x%p: ", addr);
1078
1079                 if (!get_instruction(&val, addr)) {
1080                                 val = 0;
1081                                 sprintf(buf, "????");
1082                 } else
1083                         sprintf(buf, "%04x", val);
1084
1085                 if (addr == erraddr) {
1086                         verbose_printk("[%s]", buf);
1087                         err = val;
1088                 } else
1089                         verbose_printk(" %s ", buf);
1090
1091                 /* Do any previous instructions turn on interrupts? */
1092                 if (addr <= erraddr &&                          /* in the past */
1093                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
1094                       val == 0x017b))                           /* [SP++] = RETI */
1095                         sti = 1;
1096         }
1097
1098         verbose_printk("\n");
1099
1100         /* Hardware error interrupts can be deferred */
1101         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1102             oops_in_progress)){
1103                 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1104 #ifndef CONFIG_DEBUG_HWERR
1105                 verbose_printk(KERN_NOTICE
1106 "The remaining message may be meaningless\n"
1107 "You should enable CONFIG_DEBUG_HWERR to get a better idea where it came from\n");
1108 #else
1109                 /* If we are handling only one peripheral interrupt
1110                  * and current mm and pid are valid, and the last error
1111                  * was in that user space process's text area
1112                  * print it out - because that is where the problem exists
1113                  */
1114                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1115                      (current->pid && current->mm)) {
1116                         /* And the last RETI points to the current userspace context */
1117                         if ((fp + 1)->pc >= current->mm->start_code &&
1118                             (fp + 1)->pc <= current->mm->end_code) {
1119                                 verbose_printk(KERN_NOTICE "It might be better to look around here :\n");
1120                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1121                                 show_regs(fp + 1);
1122                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1123                         }
1124                 }
1125 #endif
1126         }
1127 #endif
1128 }
1129
1130 void show_regs(struct pt_regs *fp)
1131 {
1132 #ifdef CONFIG_DEBUG_VERBOSE
1133         char buf [150];
1134         struct irqaction *action;
1135         unsigned int i;
1136         unsigned long flags = 0;
1137         unsigned int cpu = raw_smp_processor_id();
1138         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
1139
1140         verbose_printk(KERN_NOTICE "\n");
1141         if (CPUID != bfin_cpuid())
1142                 verbose_printk(KERN_NOTICE "Compiled for cpu family 0x%04x (Rev %d), "
1143                         "but running on:0x%04x (Rev %d)\n",
1144                         CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid());
1145
1146         verbose_printk(KERN_NOTICE "ADSP-%s-0.%d",
1147                 CPU, bfin_compiled_revid());
1148
1149         if (bfin_compiled_revid() !=  bfin_revid())
1150                 verbose_printk("(Detected 0.%d)", bfin_revid());
1151
1152         verbose_printk(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n",
1153                 get_cclk()/1000000, get_sclk()/1000000,
1154 #ifdef CONFIG_MPU
1155                 "mpu on"
1156 #else
1157                 "mpu off"
1158 #endif
1159                 );
1160
1161         verbose_printk(KERN_NOTICE "%s", linux_banner);
1162
1163         verbose_printk(KERN_NOTICE "\nSEQUENCER STATUS:\t\t%s\n", print_tainted());
1164         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  IMASK: %04lx  SYSCFG: %04lx\n",
1165                 (long)fp->seqstat, fp->ipend, cpu_pda[raw_smp_processor_id()].ex_imask, fp->syscfg);
1166         if (fp->ipend & EVT_IRPTEN)
1167                 verbose_printk(KERN_NOTICE "  Global Interrupts Disabled (IPEND[4])\n");
1168         if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG13 | EVT_IVG12 | EVT_IVG11 |
1169                         EVT_IVG10 | EVT_IVG9 | EVT_IVG8 | EVT_IVG7 | EVT_IVTMR)))
1170                 verbose_printk(KERN_NOTICE "  Peripheral interrupts masked off\n");
1171         if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG15 | EVT_IVG14)))
1172                 verbose_printk(KERN_NOTICE "  Kernel interrupts masked off\n");
1173         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1174                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1175                         (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1176 #ifdef EBIU_ERRMST
1177                 /* If the error was from the EBIU, print it out */
1178                 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1179                         verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
1180                                 bfin_read_EBIU_ERRMST());
1181                         verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
1182                                 bfin_read_EBIU_ERRADD());
1183                 }
1184 #endif
1185         }
1186         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1187                 fp->seqstat & SEQSTAT_EXCAUSE);
1188         for (i = 2; i <= 15 ; i++) {
1189                 if (fp->ipend & (1 << i)) {
1190                         if (i != 4) {
1191                                 decode_address(buf, bfin_read32(EVT0 + 4*i));
1192                                 verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1193                         } else
1194                                 verbose_printk(KERN_NOTICE "  interrupts disabled\n");
1195                 }
1196         }
1197
1198         /* if no interrupts are going off, don't print this out */
1199         if (fp->ipend & ~0x3F) {
1200                 for (i = 0; i < (NR_IRQS - 1); i++) {
1201                         if (!in_atomic)
1202                                 raw_spin_lock_irqsave(&irq_desc[i].lock, flags);
1203
1204                         action = irq_desc[i].action;
1205                         if (!action)
1206                                 goto unlock;
1207
1208                         decode_address(buf, (unsigned int)action->handler);
1209                         verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1210                         for (action = action->next; action; action = action->next) {
1211                                 decode_address(buf, (unsigned int)action->handler);
1212                                 verbose_printk(", %s", buf);
1213                         }
1214                         verbose_printk("\n");
1215 unlock:
1216                         if (!in_atomic)
1217                                 raw_spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1218                 }
1219         }
1220
1221         decode_address(buf, fp->rete);
1222         verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1223         decode_address(buf, fp->retn);
1224         verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1225         decode_address(buf, fp->retx);
1226         verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1227         decode_address(buf, fp->rets);
1228         verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1229         decode_address(buf, fp->pc);
1230         verbose_printk(KERN_NOTICE " PC  : %s\n", buf);
1231
1232         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1233             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1234                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
1235                 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1236                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
1237                 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1238         }
1239
1240         verbose_printk(KERN_NOTICE "PROCESSOR STATE:\n");
1241         verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1242                 fp->r0, fp->r1, fp->r2, fp->r3);
1243         verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1244                 fp->r4, fp->r5, fp->r6, fp->r7);
1245         verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1246                 fp->p0, fp->p1, fp->p2, fp->p3);
1247         verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1248                 fp->p4, fp->p5, fp->fp, (long)fp);
1249         verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1250                 fp->lb0, fp->lt0, fp->lc0);
1251         verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1252                 fp->lb1, fp->lt1, fp->lc1);
1253         verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1254                 fp->b0, fp->l0, fp->m0, fp->i0);
1255         verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1256                 fp->b1, fp->l1, fp->m1, fp->i1);
1257         verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1258                 fp->b2, fp->l2, fp->m2, fp->i2);
1259         verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1260                 fp->b3, fp->l3, fp->m3, fp->i3);
1261         verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1262                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1263
1264         verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1265                 rdusp(), fp->astat);
1266
1267         verbose_printk(KERN_NOTICE "\n");
1268 #endif
1269 }
1270
1271 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1272 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1273 #endif
1274
1275 static DEFINE_SPINLOCK(bfin_spinlock_lock);
1276
1277 asmlinkage int sys_bfin_spinlock(int *p)
1278 {
1279         int ret, tmp = 0;
1280
1281         spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
1282         ret = get_user(tmp, p);
1283         if (likely(ret == 0)) {
1284                 if (unlikely(tmp))
1285                         ret = 1;
1286                 else
1287                         put_user(1, p);
1288         }
1289         spin_unlock(&bfin_spinlock_lock);
1290         return ret;
1291 }
1292
1293 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1294 {
1295         void (*curr_handler)(void);
1296
1297         if (exception > 0x3F)
1298                 return -EINVAL;
1299
1300         curr_handler = ex_table[exception];
1301
1302         if (curr_handler != ex_replaceable)
1303                 return -EBUSY;
1304
1305         ex_table[exception] = handler;
1306
1307         return 0;
1308 }
1309 EXPORT_SYMBOL(bfin_request_exception);
1310
1311 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1312 {
1313         void (*curr_handler)(void);
1314
1315         if (exception > 0x3F)
1316                 return -EINVAL;
1317
1318         curr_handler = ex_table[exception];
1319
1320         if (curr_handler != handler)
1321                 return -EBUSY;
1322
1323         ex_table[exception] = ex_replaceable;
1324
1325         return 0;
1326 }
1327 EXPORT_SYMBOL(bfin_free_exception);
1328
1329 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1330 {
1331         switch (cplb_panic) {
1332         case CPLB_NO_UNLOCKED:
1333                 printk(KERN_EMERG "All CPLBs are locked\n");
1334                 break;
1335         case CPLB_PROT_VIOL:
1336                 return;
1337         case CPLB_NO_ADDR_MATCH:
1338                 return;
1339         case CPLB_UNKNOWN_ERR:
1340                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1341                 break;
1342         }
1343
1344         oops_in_progress = 1;
1345
1346         dump_bfin_process(fp);
1347         dump_bfin_mem(fp);
1348         show_regs(fp);
1349         dump_stack();
1350         panic("Unrecoverable event");
1351 }