arch/blackfin/kernel/traps.c

   1 /*
   2  * File:         arch/blackfin/kernel/traps.c
   3  * Based on:
   4  * Author:       Hamish Macdonald
   5  *
   6  * Created:
   7  * Description:  uses S/W interrupt 15 for the system calls
   8  *
   9  * Modified:
  10  *               Copyright 2004-2006 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 #include <linux/uaccess.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/module.h>
  33 #include <linux/kallsyms.h>
  34 #include <linux/fs.h>
  35 #include <asm/traps.h>
  36 #include <asm/cacheflush.h>
  37 #include <asm/cplb.h>
  38 #include <asm/blackfin.h>
  39 #include <asm/irq_handler.h>
  40 #include <linux/irq.h>
  41 #include <asm/trace.h>
  42 #include <asm/fixed_code.h>
  43
  44 #ifdef CONFIG_KGDB
  45 # include <linux/kgdb.h>
  46
  47 # define CHK_DEBUGGER_TRAP() \
  48         do { \
  49                 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
  50         } while (0)
  51 # define CHK_DEBUGGER_TRAP_MAYBE() \
  52         do { \
  53                 if (kgdb_connected) \
  54                         CHK_DEBUGGER_TRAP(); \
  55         } while (0)
  56 #else
  57 # define CHK_DEBUGGER_TRAP() do { } while (0)
  58 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  59 #endif
  60
  61
  62 #ifdef CONFIG_DEBUG_VERBOSE
  63 #define verbose_printk(fmt, arg...) \
  64         printk(fmt, ##arg)
  65 #else
  66 #define verbose_printk(fmt, arg...) \
  67         ({ if (0) printk(fmt, ##arg); 0; })
  68 #endif
  69
  70 /* Initiate the event table handler */
  71 void __init trap_init(void)
  72 {
  73         CSYNC();
  74         bfin_write_EVT3(trap);
  75         CSYNC();
  76 }
  77
  78 static void decode_address(char *buf, unsigned long address)
  79 {
  80 #ifdef CONFIG_DEBUG_VERBOSE
  81         struct vm_list_struct *vml;
  82         struct task_struct *p;
  83         struct mm_struct *mm;
  84         unsigned long flags, offset;
  85         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
  86
  87 #ifdef CONFIG_KALLSYMS
  88         unsigned long symsize;
  89         const char *symname;
  90         char *modname;
  91         char *delim = ":";
  92         char namebuf[128];
  93
  94         /* look up the address and see if we are in kernel space */
  95         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
  96
  97         if (symname) {
  98                 /* yeah! kernel space! */
  99                 if (!modname)
 100                         modname = delim = "";
 101                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
 102                               (void *)address, delim, modname, delim, symname,
 103                               (unsigned long)offset);
 104                 return;
 105
 106         }
 107 #endif
 108
 109         /* Problem in fixed code section? */
 110         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 111                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
 112                 return;
 113         }
 114
 115         /* Problem somewhere before the kernel start address */
 116         if (address < CONFIG_BOOT_LOAD) {
 117                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
 118                 return;
 119         }
 120
 121         /* looks like we're off in user-land, so let's walk all the
 122          * mappings of all our processes and see if we can't be a whee
 123          * bit more specific
 124          */
 125         write_lock_irqsave(&tasklist_lock, flags);
 126         for_each_process(p) {
 127                 mm = (in_atomic ? p->mm : get_task_mm(p));
 128                 if (!mm)
 129                         continue;
 130
 131                 vml = mm->context.vmlist;
 132                 while (vml) {
 133                         struct vm_area_struct *vma = vml->vma;
 134
 135                         if (address >= vma->vm_start && address < vma->vm_end) {
 136                                 char _tmpbuf[256];
 137                                 char *name = p->comm;
 138                                 struct file *file = vma->vm_file;
 139
 140                                 if (file) {
 141                                         char *d_name = d_path(&file->f_path, _tmpbuf,
 142                                                       sizeof(_tmpbuf));
 143                                         if (!IS_ERR(d_name))
 144                                                 name = d_name;
 145                                 }
 146
 147                                 /* FLAT does not have its text aligned to the start of
 148                                  * the map while FDPIC ELF does ...
 149                                  */
 150
 151                                 /* before we can check flat/fdpic, we need to
 152                                  * make sure current is valid
 153                                  */
 154                                 if ((unsigned long)current >= FIXED_CODE_START &&
 155                                     !((unsigned long)current & 0x3)) {
 156                                         if (current->mm &&
 157                                             (address > current->mm->start_code) &&
 158                                             (address < current->mm->end_code))
 159                                                 offset = address - current->mm->start_code;
 160                                         else
 161                                                 offset = (address - vma->vm_start) +
 162                                                          (vma->vm_pgoff << PAGE_SHIFT);
 163
 164                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 165                                                 (void *)address, name, offset);
 166                                 } else
 167                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
 168                                                 (void *)address, name,
 169                                                 vma->vm_start, vma->vm_end);
 170
 171                                 if (!in_atomic)
 172                                         mmput(mm);
 173
 174                                 if (!strlen(buf))
 175                                         sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
 176
 177                                 goto done;
 178                         }
 179
 180                         vml = vml->next;
 181                 }
 182                 if (!in_atomic)
 183                         mmput(mm);
 184         }
 185
 186         /* we were unable to find this address anywhere */
 187         sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
 188
 189 done:
 190         write_unlock_irqrestore(&tasklist_lock, flags);
 191 #else
 192         sprintf(buf, " ");
 193 #endif
 194 }
 195
 196 asmlinkage void double_fault_c(struct pt_regs *fp)
 197 {
 198         console_verbose();
 199         oops_in_progress = 1;
 200 #ifdef CONFIG_DEBUG_VERBOSE
 201         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 202 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 203         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 204                 unsigned int cpu = smp_processor_id();
 205                 char buf[150];
 206                 decode_address(buf, cpu_pda[cpu].retx);
 207                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 208                         (unsigned int)cpu_pda[cpu].seqstat & SEQSTAT_EXCAUSE, buf);
 209                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
 210                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 211                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
 212                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 213
 214                 decode_address(buf, fp->retx);
 215                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
 216         } else
 217 #endif
 218         {
 219                 dump_bfin_process(fp);
 220                 dump_bfin_mem(fp);
 221                 show_regs(fp);
 222         }
 223 #endif
 224         panic("Double Fault - unrecoverable event\n");
 225
 226 }
 227
 228 asmlinkage void trap_c(struct pt_regs *fp)
 229 {
 230 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 231         int j;
 232 #endif
 233 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 234         unsigned int cpu = smp_processor_id();
 235 #endif
 236         int sig = 0;
 237         siginfo_t info;
 238         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 239
 240         trace_buffer_save(j);
 241
 242         /* Important - be very careful dereferncing pointers - will lead to
 243          * double faults if the stack has become corrupt
 244          */
 245
 246         /* If the fault was caused by a kernel thread, or interrupt handler
 247          * we will kernel panic, so the system reboots.
 248          * If KGDB is enabled, don't set this for kernel breakpoints
 249         */
 250
 251         /* TODO: check to see if we are in some sort of deferred HWERR
 252          * that we should be able to recover from, not kernel panic
 253          */
 254         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
 255 #ifdef CONFIG_KGDB
 256                 && (trapnr != VEC_EXCPT02)
 257 #endif
 258         ){
 259                 console_verbose();
 260                 oops_in_progress = 1;
 261         } else if (current) {
 262                 if (current->mm == NULL) {
 263                         console_verbose();
 264                         oops_in_progress = 1;
 265                 }
 266         }
 267
 268         /* trap_c() will be called for exceptions. During exceptions
 269          * processing, the pc value should be set with retx value.
 270          * With this change we can cleanup some code in signal.c- TODO
 271          */
 272         fp->orig_pc = fp->retx;
 273         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 274                 trapnr, fp->ipend, fp->pc, fp->retx); */
 275
 276         /* send the appropriate signal to the user program */
 277         switch (trapnr) {
 278
 279         /* This table works in conjuction with the one in ./mach-common/entry.S
 280          * Some exceptions are handled there (in assembly, in exception space)
 281          * Some are handled here, (in C, in interrupt space)
 282          * Some, like CPLB, are handled in both, where the normal path is
 283          * handled in assembly/exception space, and the error path is handled
 284          * here
 285          */
 286
 287         /* 0x00 - Linux Syscall, getting here is an error */
 288         /* 0x01 - userspace gdb breakpoint, handled here */
 289         case VEC_EXCPT01:
 290                 info.si_code = TRAP_ILLTRAP;
 291                 sig = SIGTRAP;
 292                 CHK_DEBUGGER_TRAP_MAYBE();
 293                 /* Check if this is a breakpoint in kernel space */
 294                 if (fp->ipend & 0xffc0)
 295                         return;
 296                 else
 297                         break;
 298         /* 0x03 - User Defined, userspace stack overflow */
 299         case VEC_EXCPT03:
 300                 info.si_code = SEGV_STACKFLOW;
 301                 sig = SIGSEGV;
 302                 verbose_printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
 303                 CHK_DEBUGGER_TRAP_MAYBE();
 304                 break;
 305         /* 0x02 - KGDB initial connection and break signal trap */
 306         case VEC_EXCPT02:
 307 #ifdef CONFIG_KGDB
 308                 info.si_code = TRAP_ILLTRAP;
 309                 sig = SIGTRAP;
 310                 CHK_DEBUGGER_TRAP();
 311                 return;
 312 #endif
 313         /* 0x04 - User Defined */
 314         /* 0x05 - User Defined */
 315         /* 0x06 - User Defined */
 316         /* 0x07 - User Defined */
 317         /* 0x08 - User Defined */
 318         /* 0x09 - User Defined */
 319         /* 0x0A - User Defined */
 320         /* 0x0B - User Defined */
 321         /* 0x0C - User Defined */
 322         /* 0x0D - User Defined */
 323         /* 0x0E - User Defined */
 324         /* 0x0F - User Defined */
 325         /* If we got here, it is most likely that someone was trying to use a
 326          * custom exception handler, and it is not actually installed properly
 327          */
 328         case VEC_EXCPT04 ... VEC_EXCPT15:
 329                 info.si_code = ILL_ILLPARAOP;
 330                 sig = SIGILL;
 331                 verbose_printk(KERN_NOTICE EXC_0x04(KERN_NOTICE));
 332                 CHK_DEBUGGER_TRAP_MAYBE();
 333                 break;
 334         /* 0x10 HW Single step, handled here */
 335         case VEC_STEP:
 336                 info.si_code = TRAP_STEP;
 337                 sig = SIGTRAP;
 338                 CHK_DEBUGGER_TRAP_MAYBE();
 339                 /* Check if this is a single step in kernel space */
 340                 if (fp->ipend & 0xffc0)
 341                         return;
 342                 else
 343                         break;
 344         /* 0x11 - Trace Buffer Full, handled here */
 345         case VEC_OVFLOW:
 346                 info.si_code = TRAP_TRACEFLOW;
 347                 sig = SIGTRAP;
 348                 verbose_printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
 349                 CHK_DEBUGGER_TRAP_MAYBE();
 350                 break;
 351         /* 0x12 - Reserved, Caught by default */
 352         /* 0x13 - Reserved, Caught by default */
 353         /* 0x14 - Reserved, Caught by default */
 354         /* 0x15 - Reserved, Caught by default */
 355         /* 0x16 - Reserved, Caught by default */
 356         /* 0x17 - Reserved, Caught by default */
 357         /* 0x18 - Reserved, Caught by default */
 358         /* 0x19 - Reserved, Caught by default */
 359         /* 0x1A - Reserved, Caught by default */
 360         /* 0x1B - Reserved, Caught by default */
 361         /* 0x1C - Reserved, Caught by default */
 362         /* 0x1D - Reserved, Caught by default */
 363         /* 0x1E - Reserved, Caught by default */
 364         /* 0x1F - Reserved, Caught by default */
 365         /* 0x20 - Reserved, Caught by default */
 366         /* 0x21 - Undefined Instruction, handled here */
 367         case VEC_UNDEF_I:
 368                 info.si_code = ILL_ILLOPC;
 369                 sig = SIGILL;
 370                 verbose_printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
 371                 CHK_DEBUGGER_TRAP_MAYBE();
 372                 break;
 373         /* 0x22 - Illegal Instruction Combination, handled here */
 374         case VEC_ILGAL_I:
 375                 info.si_code = ILL_ILLPARAOP;
 376                 sig = SIGILL;
 377                 verbose_printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
 378                 CHK_DEBUGGER_TRAP_MAYBE();
 379                 break;
 380         /* 0x23 - Data CPLB protection violation, handled here */
 381         case VEC_CPLB_VL:
 382                 info.si_code = ILL_CPLB_VI;
 383                 sig = SIGBUS;
 384                 verbose_printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
 385                 CHK_DEBUGGER_TRAP_MAYBE();
 386                 break;
 387         /* 0x24 - Data access misaligned, handled here */
 388         case VEC_MISALI_D:
 389                 info.si_code = BUS_ADRALN;
 390                 sig = SIGBUS;
 391                 verbose_printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
 392                 CHK_DEBUGGER_TRAP_MAYBE();
 393                 break;
 394         /* 0x25 - Unrecoverable Event, handled here */
 395         case VEC_UNCOV:
 396                 info.si_code = ILL_ILLEXCPT;
 397                 sig = SIGILL;
 398                 verbose_printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
 399                 CHK_DEBUGGER_TRAP_MAYBE();
 400                 break;
 401         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 402                 error case is handled here */
 403         case VEC_CPLB_M:
 404                 info.si_code = BUS_ADRALN;
 405                 sig = SIGBUS;
 406                 verbose_printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
 407                 break;
 408         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 409         case VEC_CPLB_MHIT:
 410                 info.si_code = ILL_CPLB_MULHIT;
 411                 sig = SIGSEGV;
 412 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 413                 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
 414                         verbose_printk(KERN_NOTICE "NULL pointer access\n");
 415                 else
 416 #endif
 417                         verbose_printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
 418                 CHK_DEBUGGER_TRAP_MAYBE();
 419                 break;
 420         /* 0x28 - Emulation Watchpoint, handled here */
 421         case VEC_WATCH:
 422                 info.si_code = TRAP_WATCHPT;
 423                 sig = SIGTRAP;
 424                 pr_debug(EXC_0x28(KERN_DEBUG));
 425                 CHK_DEBUGGER_TRAP_MAYBE();
 426                 /* Check if this is a watchpoint in kernel space */
 427                 if (fp->ipend & 0xffc0)
 428                         return;
 429                 else
 430                         break;
 431 #ifdef CONFIG_BF535
 432         /* 0x29 - Instruction fetch access error (535 only) */
 433         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 434                 info.si_code = BUS_OPFETCH;
 435                 sig = SIGBUS;
 436                 verbose_printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 437                 CHK_DEBUGGER_TRAP_MAYBE();
 438                 break;
 439 #else
 440         /* 0x29 - Reserved, Caught by default */
 441 #endif
 442         /* 0x2A - Instruction fetch misaligned, handled here */
 443         case VEC_MISALI_I:
 444                 info.si_code = BUS_ADRALN;
 445                 sig = SIGBUS;
 446                 verbose_printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
 447                 CHK_DEBUGGER_TRAP_MAYBE();
 448                 break;
 449         /* 0x2B - Instruction CPLB protection violation, handled here */
 450         case VEC_CPLB_I_VL:
 451                 info.si_code = ILL_CPLB_VI;
 452                 sig = SIGBUS;
 453                 verbose_printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
 454                 CHK_DEBUGGER_TRAP_MAYBE();
 455                 break;
 456         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 457         case VEC_CPLB_I_M:
 458                 info.si_code = ILL_CPLB_MISS;
 459                 sig = SIGBUS;
 460                 verbose_printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
 461                 break;
 462         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 463         case VEC_CPLB_I_MHIT:
 464                 info.si_code = ILL_CPLB_MULHIT;
 465                 sig = SIGSEGV;
 466 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 467                 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
 468                         verbose_printk(KERN_NOTICE "Jump to NULL address\n");
 469                 else
 470 #endif
 471                         verbose_printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
 472                 CHK_DEBUGGER_TRAP_MAYBE();
 473                 break;
 474         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 475         case VEC_ILL_RES:
 476                 info.si_code = ILL_PRVOPC;
 477                 sig = SIGILL;
 478                 verbose_printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
 479                 CHK_DEBUGGER_TRAP_MAYBE();
 480                 break;
 481         /* 0x2F - Reserved, Caught by default */
 482         /* 0x30 - Reserved, Caught by default */
 483         /* 0x31 - Reserved, Caught by default */
 484         /* 0x32 - Reserved, Caught by default */
 485         /* 0x33 - Reserved, Caught by default */
 486         /* 0x34 - Reserved, Caught by default */
 487         /* 0x35 - Reserved, Caught by default */
 488         /* 0x36 - Reserved, Caught by default */
 489         /* 0x37 - Reserved, Caught by default */
 490         /* 0x38 - Reserved, Caught by default */
 491         /* 0x39 - Reserved, Caught by default */
 492         /* 0x3A - Reserved, Caught by default */
 493         /* 0x3B - Reserved, Caught by default */
 494         /* 0x3C - Reserved, Caught by default */
 495         /* 0x3D - Reserved, Caught by default */
 496         /* 0x3E - Reserved, Caught by default */
 497         /* 0x3F - Reserved, Caught by default */
 498         case VEC_HWERR:
 499                 info.si_code = BUS_ADRALN;
 500                 sig = SIGBUS;
 501                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 502                 /* System MMR Error */
 503                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 504                         info.si_code = BUS_ADRALN;
 505                         sig = SIGBUS;
 506                         verbose_printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
 507                         break;
 508                 /* External Memory Addressing Error */
 509                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 510                         info.si_code = BUS_ADRERR;
 511                         sig = SIGBUS;
 512                         verbose_printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
 513                         break;
 514                 /* Performance Monitor Overflow */
 515                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 516                         verbose_printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
 517                         break;
 518                 /* RAISE 5 instruction */
 519                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 520                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 521                         break;
 522                 default:        /* Reserved */
 523                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 524                         break;
 525                 }
 526                 CHK_DEBUGGER_TRAP_MAYBE();
 527                 break;
 528         /*
 529          * We should be handling all known exception types above,
 530          * if we get here we hit a reserved one, so panic
 531          */
 532         default:
 533                 oops_in_progress = 1;
 534                 info.si_code = ILL_ILLPARAOP;
 535                 sig = SIGILL;
 536                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 537                         (fp->seqstat & SEQSTAT_EXCAUSE));
 538                 CHK_DEBUGGER_TRAP_MAYBE();
 539                 break;
 540         }
 541
 542         BUG_ON(sig == 0);
 543
 544         if (sig != SIGTRAP) {
 545                 dump_bfin_process(fp);
 546                 dump_bfin_mem(fp);
 547                 show_regs(fp);
 548
 549                 /* Print out the trace buffer if it makes sense */
 550 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 551                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 552                         verbose_printk(KERN_NOTICE "No trace since you do not have "
 553                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 554                                 KERN_NOTICE "\n");
 555                 else
 556 #endif
 557                         dump_bfin_trace_buffer();
 558
 559                 if (oops_in_progress) {
 560                         /* Dump the current kernel stack */
 561                         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "Kernel Stack\n");
 562                         show_stack(current, NULL);
 563                         print_modules();
 564 #ifndef CONFIG_ACCESS_CHECK
 565                         verbose_printk(KERN_EMERG "Please turn on "
 566                                "CONFIG_ACCESS_CHECK\n");
 567 #endif
 568                         panic("Kernel exception");
 569                 } else {
 570 #ifdef CONFIG_DEBUG_VERBOSE
 571                         unsigned long *stack;
 572                         /* Dump the user space stack */
 573                         stack = (unsigned long *)rdusp();
 574                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
 575                         show_stack(NULL, stack);
 576 #endif
 577                 }
 578         }
 579
 580 #ifdef CONFIG_IPIPE
 581         if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
 582 #endif
 583         {
 584                 info.si_signo = sig;
 585                 info.si_errno = 0;
 586                 info.si_addr = (void __user *)fp->pc;
 587                 force_sig_info(sig, &info, current);
 588         }
 589
 590         trace_buffer_restore(j);
 591         return;
 592 }
 593
 594 /* Typical exception handling routines  */
 595
 596 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 597
 598 /*
 599  * Similar to get_user, do some address checking, then dereference
 600  * Return true on sucess, false on bad address
 601  */
 602 static bool get_instruction(unsigned short *val, unsigned short *address)
 603 {
 604
 605         unsigned long addr;
 606
 607         addr = (unsigned long)address;
 608
 609         /* Check for odd addresses */
 610         if (addr & 0x1)
 611                 return false;
 612
 613         /* Check that things do not wrap around */
 614         if (addr > (addr + 2))
 615                 return false;
 616
 617         /*
 618          * Since we are in exception context, we need to do a little address checking
 619          * We need to make sure we are only accessing valid memory, and
 620          * we don't read something in the async space that can hang forever
 621          */
 622         if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
 623 #if L2_LENGTH != 0
 624             (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
 625 #endif
 626             (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||
 627 #if L1_DATA_A_LENGTH != 0
 628             (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) ||
 629 #endif
 630 #if L1_DATA_B_LENGTH != 0
 631             (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) ||
 632 #endif
 633             (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) ||
 634             (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) &&
 635                addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) ||
 636             (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) &&
 637                addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) ||
 638             (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) &&
 639                addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) ||
 640             (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) &&
 641               addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) {
 642                 *val = *address;
 643                 return true;
 644         }
 645
 646 #if L1_CODE_LENGTH != 0
 647         if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) {
 648                 isram_memcpy(val, address, 2);
 649                 return true;
 650         }
 651 #endif
 652
 653
 654         return false;
 655 }
 656
 657 /*
 658  * decode the instruction if we are printing out the trace, as it
 659  * makes things easier to follow, without running it through objdump
 660  * These are the normal instructions which cause change of flow, which
 661  * would be at the source of the trace buffer
 662  */
 663 #if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
 664 static void decode_instruction(unsigned short *address)
 665 {
 666         unsigned short opcode;
 667
 668         if (get_instruction(&opcode, address)) {
 669                 if (opcode == 0x0010)
 670                         verbose_printk("RTS");
 671                 else if (opcode == 0x0011)
 672                         verbose_printk("RTI");
 673                 else if (opcode == 0x0012)
 674                         verbose_printk("RTX");
 675                 else if (opcode >= 0x0050 && opcode <= 0x0057)
 676                         verbose_printk("JUMP (P%i)", opcode & 7);
 677                 else if (opcode >= 0x0060 && opcode <= 0x0067)
 678                         verbose_printk("CALL (P%i)", opcode & 7);
 679                 else if (opcode >= 0x0070 && opcode <= 0x0077)
 680                         verbose_printk("CALL (PC+P%i)", opcode & 7);
 681                 else if (opcode >= 0x0080 && opcode <= 0x0087)
 682                         verbose_printk("JUMP (PC+P%i)", opcode & 7);
 683                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
 684                         verbose_printk("IF !CC JUMP");
 685                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
 686                         verbose_printk("IF CC JUMP");
 687                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
 688                         verbose_printk("JUMP.S");
 689                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
 690                         verbose_printk("LSETUP");
 691                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
 692                         verbose_printk("JUMP.L");
 693                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
 694                         verbose_printk("CALL pcrel");
 695                 else
 696                         verbose_printk("0x%04x", opcode);
 697         }
 698
 699 }
 700 #endif
 701
 702 void dump_bfin_trace_buffer(void)
 703 {
 704 #ifdef CONFIG_DEBUG_VERBOSE
 705 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 706         int tflags, i = 0;
 707         char buf[150];
 708         unsigned short *addr;
 709 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 710         int j, index;
 711 #endif
 712
 713         trace_buffer_save(tflags);
 714
 715         printk(KERN_NOTICE "Hardware Trace:\n");
 716
 717 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 718         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
 719 #endif
 720
 721         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 722                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 723                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 724                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 725                         addr = (unsigned short *)bfin_read_TBUF();
 726                         decode_address(buf, (unsigned long)addr);
 727                         printk(KERN_NOTICE "     Source : %s ", buf);
 728                         decode_instruction(addr);
 729                         printk("\n");
 730                 }
 731         }
 732
 733 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 734         if (trace_buff_offset)
 735                 index = trace_buff_offset / 4;
 736         else
 737                 index = EXPAND_LEN;
 738
 739         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 740         while (j) {
 741                 decode_address(buf, software_trace_buff[index]);
 742                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 743                 index -= 1;
 744                 if (index < 0 )
 745                         index = EXPAND_LEN;
 746                 decode_address(buf, software_trace_buff[index]);
 747                 printk(KERN_NOTICE "     Source : %s ", buf);
 748                 decode_instruction((unsigned short *)software_trace_buff[index]);
 749                 printk("\n");
 750                 index -= 1;
 751                 if (index < 0)
 752                         index = EXPAND_LEN;
 753                 j--;
 754                 i++;
 755         }
 756 #endif
 757
 758         trace_buffer_restore(tflags);
 759 #endif
 760 #endif
 761 }
 762 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 763
 764 /*
 765  * Checks to see if the address pointed to is either a
 766  * 16-bit CALL instruction, or a 32-bit CALL instruction
 767  */
 768 static bool is_bfin_call(unsigned short *addr)
 769 {
 770         unsigned short opcode = 0, *ins_addr;
 771         ins_addr = (unsigned short *)addr;
 772
 773         if (!get_instruction(&opcode, ins_addr))
 774                 return false;
 775
 776         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
 777             (opcode >= 0x0070 && opcode <= 0x0077))
 778                 return true;
 779
 780         ins_addr--;
 781         if (!get_instruction(&opcode, ins_addr))
 782                 return false;
 783
 784         if (opcode >= 0xE300 && opcode <= 0xE3FF)
 785                 return true;
 786
 787         return false;
 788
 789 }
 790
 791 void show_stack(struct task_struct *task, unsigned long *stack)
 792 {
 793 #ifdef CONFIG_PRINTK
 794         unsigned int *addr, *endstack, *fp = 0, *frame;
 795         unsigned short *ins_addr;
 796         char buf[150];
 797         unsigned int i, j, ret_addr, frame_no = 0;
 798
 799         /*
 800          * If we have been passed a specific stack, use that one otherwise
 801          *    if we have been passed a task structure, use that, otherwise
 802          *    use the stack of where the variable "stack" exists
 803          */
 804
 805         if (stack == NULL) {
 806                 if (task) {
 807                         /* We know this is a kernel stack, so this is the start/end */
 808                         stack = (unsigned long *)task->thread.ksp;
 809                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
 810                 } else {
 811                         /* print out the existing stack info */
 812                         stack = (unsigned long *)&stack;
 813                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 814                 }
 815         } else
 816                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 817
 818         printk(KERN_NOTICE "Stack info:\n");
 819         decode_address(buf, (unsigned int)stack);
 820         printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
 821
 822         addr = (unsigned int *)((unsigned int)stack & ~0x3F);
 823
 824         /* First thing is to look for a frame pointer */
 825         for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 826                 addr < endstack; addr++, i++) {
 827                 if (*addr & 0x1)
 828                         continue;
 829                 ins_addr = (unsigned short *)*addr;
 830                 ins_addr--;
 831                 if (is_bfin_call(ins_addr))
 832                         fp = addr - 1;
 833
 834                 if (fp) {
 835                         /* Let's check to see if it is a frame pointer */
 836                         while (fp >= (addr - 1) && fp < endstack && fp)
 837                                 fp = (unsigned int *)*fp;
 838                         if (fp == 0 || fp == endstack) {
 839                                 fp = addr - 1;
 840                                 break;
 841                         }
 842                         fp = 0;
 843                 }
 844         }
 845         if (fp) {
 846                 frame = fp;
 847                 printk(KERN_NOTICE " FP: (0x%p)\n", fp);
 848         } else
 849                 frame = 0;
 850
 851         /*
 852          * Now that we think we know where things are, we
 853          * walk the stack again, this time printing things out
 854          * incase there is no frame pointer, we still look for
 855          * valid return addresses
 856          */
 857
 858         /* First time print out data, next time, print out symbols */
 859         for (j = 0; j <= 1; j++) {
 860                 if (j)
 861                         printk(KERN_NOTICE "Return addresses in stack:\n");
 862                 else
 863                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
 864
 865                 fp = frame;
 866                 frame_no = 0;
 867
 868                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 869                      addr <= endstack; addr++, i++) {
 870
 871                         ret_addr = 0;
 872                         if (!j && i % 8 == 0)
 873                                 printk("\n" KERN_NOTICE "%p:",addr);
 874
 875                         /* if it is an odd address, or zero, just skip it */
 876                         if (*addr & 0x1 || !*addr)
 877                                 goto print;
 878
 879                         ins_addr = (unsigned short *)*addr;
 880
 881                         /* Go back one instruction, and see if it is a CALL */
 882                         ins_addr--;
 883                         ret_addr = is_bfin_call(ins_addr);
 884  print:
 885                         if (!j && stack == (unsigned long *)addr)
 886                                 printk("[%08x]", *addr);
 887                         else if (ret_addr)
 888                                 if (j) {
 889                                         decode_address(buf, (unsigned int)*addr);
 890                                         if (frame == addr) {
 891                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
 892                                                 continue;
 893                                         }
 894                                         printk(KERN_NOTICE "    address : %s\n", buf);
 895                                 } else
 896                                         printk("<%08x>", *addr);
 897                         else if (fp == addr) {
 898                                 if (j)
 899                                         frame = addr+1;
 900                                 else
 901                                         printk("(%08x)", *addr);
 902
 903                                 fp = (unsigned int *)*addr;
 904                                 frame_no++;
 905
 906                         } else if (!j)
 907                                 printk(" %08x ", *addr);
 908                 }
 909                 if (!j)
 910                         printk("\n");
 911         }
 912 #endif
 913 }
 914
 915 void dump_stack(void)
 916 {
 917         unsigned long stack;
 918 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 919         int tflags;
 920 #endif
 921         trace_buffer_save(tflags);
 922         dump_bfin_trace_buffer();
 923         show_stack(current, &stack);
 924         trace_buffer_restore(tflags);
 925 }
 926 EXPORT_SYMBOL(dump_stack);
 927
 928 void dump_bfin_process(struct pt_regs *fp)
 929 {
 930 #ifdef CONFIG_DEBUG_VERBOSE
 931         /* We should be able to look at fp->ipend, but we don't push it on the
 932          * stack all the time, so do this until we fix that */
 933         unsigned int context = bfin_read_IPEND();
 934
 935         if (oops_in_progress)
 936                 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
 937
 938         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 939                 verbose_printk(KERN_NOTICE "HW Error context\n");
 940         else if (context & 0x0020)
 941                 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
 942         else if (context & 0x3FC0)
 943                 verbose_printk(KERN_NOTICE "Interrupt context\n");
 944         else if (context & 0x4000)
 945                 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
 946         else if (context & 0x8000)
 947                 verbose_printk(KERN_NOTICE "Kernel process context\n");
 948
 949         /* Because we are crashing, and pointers could be bad, we check things
 950          * pretty closely before we use them
 951          */
 952         if ((unsigned long)current >= FIXED_CODE_START &&
 953             !((unsigned long)current & 0x3) && current->pid) {
 954                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
 955                 if (current->comm >= (char *)FIXED_CODE_START)
 956                         verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
 957                                 current->comm, current->pid);
 958                 else
 959                         verbose_printk(KERN_NOTICE "COMM= invalid\n");
 960
 961                 printk(KERN_NOTICE "CPU = %d\n", current_thread_info()->cpu);
 962                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
 963                         verbose_printk(KERN_NOTICE  "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
 964                                 KERN_NOTICE " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n"
 965                                 KERN_NOTICE "\n",
 966                                 (void *)current->mm->start_code,
 967                                 (void *)current->mm->end_code,
 968                                 (void *)current->mm->start_data,
 969                                 (void *)current->mm->end_data,
 970                                 (void *)current->mm->end_data,
 971                                 (void *)current->mm->brk,
 972                                 (void *)current->mm->start_stack);
 973                 else
 974                         verbose_printk(KERN_NOTICE "invalid mm\n");
 975         } else
 976                 verbose_printk(KERN_NOTICE "\n" KERN_NOTICE
 977                      "No Valid process in current context\n");
 978 #endif
 979 }
 980
 981 void dump_bfin_mem(struct pt_regs *fp)
 982 {
 983 #ifdef CONFIG_DEBUG_VERBOSE
 984         unsigned short *addr, *erraddr, val = 0, err = 0;
 985         char sti = 0, buf[6];
 986
 987         erraddr = (void *)fp->pc;
 988
 989         verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
 990
 991         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
 992              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
 993              addr++) {
 994                 if (!((unsigned long)addr & 0xF))
 995                         verbose_printk("\n" KERN_NOTICE "0x%p: ", addr);
 996
 997                 if (!get_instruction(&val, addr)) {
 998                                 val = 0;
 999                                 sprintf(buf, "????");
1000                 } else
1001                         sprintf(buf, "%04x", val);
1002
1003                 if (addr == erraddr) {
1004                         verbose_printk("[%s]", buf);
1005                         err = val;
1006                 } else
1007                         verbose_printk(" %s ", buf);
1008
1009                 /* Do any previous instructions turn on interrupts? */
1010                 if (addr <= erraddr &&                          /* in the past */
1011                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
1012                       val == 0x017b))                           /* [SP++] = RETI */
1013                         sti = 1;
1014         }
1015
1016         verbose_printk("\n");
1017
1018         /* Hardware error interrupts can be deferred */
1019         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1020             oops_in_progress)){
1021                 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1022 #ifndef CONFIG_DEBUG_HWERR
1023                 verbose_printk(KERN_NOTICE "The remaining message may be meaningless\n"
1024                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
1025                          " better idea where it came from\n");
1026 #else
1027                 /* If we are handling only one peripheral interrupt
1028                  * and current mm and pid are valid, and the last error
1029                  * was in that user space process's text area
1030                  * print it out - because that is where the problem exists
1031                  */
1032                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1033                      (current->pid && current->mm)) {
1034                         /* And the last RETI points to the current userspace context */
1035                         if ((fp + 1)->pc >= current->mm->start_code &&
1036                             (fp + 1)->pc <= current->mm->end_code) {
1037                                 verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
1038                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1039                                 show_regs(fp + 1);
1040                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1041                         }
1042                 }
1043 #endif
1044         }
1045 #endif
1046 }
1047
1048 void show_regs(struct pt_regs *fp)
1049 {
1050 #ifdef CONFIG_DEBUG_VERBOSE
1051         char buf [150];
1052         struct irqaction *action;
1053         unsigned int i;
1054         unsigned long flags;
1055         unsigned int cpu = smp_processor_id();
1056
1057         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
1058         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
1059                 (long)fp->seqstat, fp->ipend, fp->syscfg);
1060         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1061                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1062                         (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1063 #ifdef EBIU_ERRMST
1064                 /* If the error was from the EBIU, print it out */
1065                 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1066                         verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
1067                                 bfin_read_EBIU_ERRMST());
1068                         verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
1069                                 bfin_read_EBIU_ERRADD());
1070                 }
1071 #endif
1072         }
1073         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1074                 fp->seqstat & SEQSTAT_EXCAUSE);
1075         for (i = 6; i <= 15 ; i++) {
1076                 if (fp->ipend & (1 << i)) {
1077                         decode_address(buf, bfin_read32(EVT0 + 4*i));
1078                         verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1079                 }
1080         }
1081
1082         /* if no interrupts are going off, don't print this out */
1083         if (fp->ipend & ~0x3F) {
1084                 for (i = 0; i < (NR_IRQS - 1); i++) {
1085                         spin_lock_irqsave(&irq_desc[i].lock, flags);
1086                         action = irq_desc[i].action;
1087                         if (!action)
1088                                 goto unlock;
1089
1090                         decode_address(buf, (unsigned int)action->handler);
1091                         verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1092                         for (action = action->next; action; action = action->next) {
1093                                 decode_address(buf, (unsigned int)action->handler);
1094                                 verbose_printk(", %s", buf);
1095                         }
1096                         verbose_printk("\n");
1097 unlock:
1098                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1099                 }
1100         }
1101
1102         decode_address(buf, fp->rete);
1103         verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1104         decode_address(buf, fp->retn);
1105         verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1106         decode_address(buf, fp->retx);
1107         verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1108         decode_address(buf, fp->rets);
1109         verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1110         decode_address(buf, fp->pc);
1111         verbose_printk(KERN_NOTICE " PC  : %s\n", buf);
1112
1113         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1114             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1115                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
1116                 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1117                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
1118                 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1119         }
1120
1121         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
1122         verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1123                 fp->r0, fp->r1, fp->r2, fp->r3);
1124         verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1125                 fp->r4, fp->r5, fp->r6, fp->r7);
1126         verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1127                 fp->p0, fp->p1, fp->p2, fp->p3);
1128         verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1129                 fp->p4, fp->p5, fp->fp, (long)fp);
1130         verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1131                 fp->lb0, fp->lt0, fp->lc0);
1132         verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1133                 fp->lb1, fp->lt1, fp->lc1);
1134         verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1135                 fp->b0, fp->l0, fp->m0, fp->i0);
1136         verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1137                 fp->b1, fp->l1, fp->m1, fp->i1);
1138         verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1139                 fp->b2, fp->l2, fp->m2, fp->i2);
1140         verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1141                 fp->b3, fp->l3, fp->m3, fp->i3);
1142         verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1143                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1144
1145         verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1146                 rdusp(), fp->astat);
1147
1148         verbose_printk(KERN_NOTICE "\n");
1149 #endif
1150 }
1151
1152 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1153 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1154 #endif
1155
1156 static DEFINE_SPINLOCK(bfin_spinlock_lock);
1157
1158 asmlinkage int sys_bfin_spinlock(int *p)
1159 {
1160         int ret, tmp = 0;
1161
1162         spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
1163         ret = get_user(tmp, p);
1164         if (likely(ret == 0)) {
1165                 if (unlikely(tmp))
1166                         ret = 1;
1167                 else
1168                         put_user(1, p);
1169         }
1170         spin_unlock(&bfin_spinlock_lock);
1171         return ret;
1172 }
1173
1174 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1175 {
1176         void (*curr_handler)(void);
1177
1178         if (exception > 0x3F)
1179                 return -EINVAL;
1180
1181         curr_handler = ex_table[exception];
1182
1183         if (curr_handler != ex_replaceable)
1184                 return -EBUSY;
1185
1186         ex_table[exception] = handler;
1187
1188         return 0;
1189 }
1190 EXPORT_SYMBOL(bfin_request_exception);
1191
1192 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1193 {
1194         void (*curr_handler)(void);
1195
1196         if (exception > 0x3F)
1197                 return -EINVAL;
1198
1199         curr_handler = ex_table[exception];
1200
1201         if (curr_handler != handler)
1202                 return -EBUSY;
1203
1204         ex_table[exception] = ex_replaceable;
1205
1206         return 0;
1207 }
1208 EXPORT_SYMBOL(bfin_free_exception);
1209
1210 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1211 {
1212         switch (cplb_panic) {
1213         case CPLB_NO_UNLOCKED:
1214                 printk(KERN_EMERG "All CPLBs are locked\n");
1215                 break;
1216         case CPLB_PROT_VIOL:
1217                 return;
1218         case CPLB_NO_ADDR_MATCH:
1219                 return;
1220         case CPLB_UNKNOWN_ERR:
1221                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1222                 break;
1223         }
1224
1225         oops_in_progress = 1;
1226
1227         dump_bfin_process(fp);
1228         dump_bfin_mem(fp);
1229         show_regs(fp);
1230         dump_stack();
1231         panic("Unrecoverable event\n");
1232 }