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