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   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 <linux/rbtree.h>
  36 #include <asm/traps.h>
  37 #include <asm/cacheflush.h>
  38 #include <asm/cplb.h>
  39 #include <asm/blackfin.h>
  40 #include <asm/irq_handler.h>
  41 #include <linux/irq.h>
  42 #include <asm/trace.h>
  43 #include <asm/fixed_code.h>
  44
  45 #ifdef CONFIG_KGDB
  46 # include <linux/kgdb.h>
  47
  48 # define CHK_DEBUGGER_TRAP() \
  49         do { \
  50                 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
  51         } while (0)
  52 # define CHK_DEBUGGER_TRAP_MAYBE() \
  53         do { \
  54                 if (kgdb_connected) \
  55                         CHK_DEBUGGER_TRAP(); \
  56         } while (0)
  57 #else
  58 # define CHK_DEBUGGER_TRAP() do { } while (0)
  59 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  60 #endif
  61
  62
  63 #ifdef CONFIG_DEBUG_VERBOSE
  64 #define verbose_printk(fmt, arg...) \
  65         printk(fmt, ##arg)
  66 #else
  67 #define verbose_printk(fmt, arg...) \
  68         ({ if (0) printk(fmt, ##arg); 0; })
  69 #endif
  70
  71 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
  72 u32 last_seqstat;
  73 #ifdef CONFIG_DEBUG_MMRS_MODULE
  74 EXPORT_SYMBOL(last_seqstat);
  75 #endif
  76 #endif
  77
  78 /* Initiate the event table handler */
  79 void __init trap_init(void)
  80 {
  81         CSYNC();
  82         bfin_write_EVT3(trap);
  83         CSYNC();
  84 }
  85
  86 static void decode_address(char *buf, unsigned long address)
  87 {
  88 #ifdef CONFIG_DEBUG_VERBOSE
  89         struct vm_list_struct *vml;
  90         struct task_struct *p;
  91         struct mm_struct *mm;
  92         unsigned long flags, offset;
  93         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
  94         struct rb_node *n;
  95
  96 #ifdef CONFIG_KALLSYMS
  97         unsigned long symsize;
  98         const char *symname;
  99         char *modname;
 100         char *delim = ":";
 101         char namebuf[128];
 102
 103         /* look up the address and see if we are in kernel space */
 104         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
 105
 106         if (symname) {
 107                 /* yeah! kernel space! */
 108                 if (!modname)
 109                         modname = delim = "";
 110                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
 111                               (void *)address, delim, modname, delim, symname,
 112                               (unsigned long)offset);
 113                 return;
 114
 115         }
 116 #endif
 117
 118         /* Problem in fixed code section? */
 119         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 120                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
 121                 return;
 122         }
 123
 124         /* Problem somewhere before the kernel start address */
 125         if (address < CONFIG_BOOT_LOAD) {
 126                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
 127                 return;
 128         }
 129
 130         /* looks like we're off in user-land, so let's walk all the
 131          * mappings of all our processes and see if we can't be a whee
 132          * bit more specific
 133          */
 134         write_lock_irqsave(&tasklist_lock, flags);
 135         for_each_process(p) {
 136                 mm = (in_atomic ? p->mm : get_task_mm(p));
 137                 if (!mm)
 138                         continue;
 139
 140                 for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
 141                         struct vm_area_struct *vma;
 142
 143                         vma = rb_entry(n, struct vm_area_struct, vm_rb);
 144
 145                         if (address >= vma->vm_start && address < vma->vm_end) {
 146                                 char _tmpbuf[256];
 147                                 char *name = p->comm;
 148                                 struct file *file = vma->vm_file;
 149
 150                                 if (file) {
 151                                         char *d_name = d_path(&file->f_path, _tmpbuf,
 152                                                       sizeof(_tmpbuf));
 153                                         if (!IS_ERR(d_name))
 154                                                 name = d_name;
 155                                 }
 156
 157                                 /* FLAT does not have its text aligned to the start of
 158                                  * the map while FDPIC ELF does ...
 159                                  */
 160
 161                                 /* before we can check flat/fdpic, we need to
 162                                  * make sure current is valid
 163                                  */
 164                                 if ((unsigned long)current >= FIXED_CODE_START &&
 165                                     !((unsigned long)current & 0x3)) {
 166                                         if (current->mm &&
 167                                             (address > current->mm->start_code) &&
 168                                             (address < current->mm->end_code))
 169                                                 offset = address - current->mm->start_code;
 170                                         else
 171                                                 offset = (address - vma->vm_start) +
 172                                                          (vma->vm_pgoff << PAGE_SHIFT);
 173
 174                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 175                                                 (void *)address, name, offset);
 176                                 } else
 177                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
 178                                                 (void *)address, name,
 179                                                 vma->vm_start, vma->vm_end);
 180
 181                                 if (!in_atomic)
 182                                         mmput(mm);
 183
 184                                 if (!strlen(buf))
 185                                         sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
 186
 187                                 goto done;
 188                         }
 189                 }
 190                 if (!in_atomic)
 191                         mmput(mm);
 192         }
 193
 194         /* we were unable to find this address anywhere */
 195         sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
 196
 197 done:
 198         write_unlock_irqrestore(&tasklist_lock, flags);
 199 #else
 200         sprintf(buf, " ");
 201 #endif
 202 }
 203
 204 asmlinkage void double_fault_c(struct pt_regs *fp)
 205 {
 206 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 207         int j;
 208         trace_buffer_save(j);
 209 #endif
 210
 211         console_verbose();
 212         oops_in_progress = 1;
 213 #ifdef CONFIG_DEBUG_VERBOSE
 214         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 215 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 216         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 217                 unsigned int cpu = smp_processor_id();
 218                 char buf[150];
 219                 decode_address(buf, cpu_pda[cpu].retx);
 220                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 221                         (unsigned int)cpu_pda[cpu].seqstat & SEQSTAT_EXCAUSE, buf);
 222                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
 223                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 224                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
 225                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 226
 227                 decode_address(buf, fp->retx);
 228                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
 229         } else
 230 #endif
 231         {
 232                 dump_bfin_process(fp);
 233                 dump_bfin_mem(fp);
 234                 show_regs(fp);
 235                 dump_bfin_trace_buffer();
 236         }
 237 #endif
 238         panic("Double Fault - unrecoverable event");
 239
 240 }
 241
 242 asmlinkage void trap_c(struct pt_regs *fp)
 243 {
 244 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 245         int j;
 246 #endif
 247 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 248         unsigned int cpu = smp_processor_id();
 249 #endif
 250         int sig = 0;
 251         siginfo_t info;
 252         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 253
 254         trace_buffer_save(j);
 255 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
 256         last_seqstat = (u32)fp->seqstat;
 257 #endif
 258
 259         /* Important - be very careful dereferncing pointers - will lead to
 260          * double faults if the stack has become corrupt
 261          */
 262
 263         /* If the fault was caused by a kernel thread, or interrupt handler
 264          * we will kernel panic, so the system reboots.
 265          * If KGDB is enabled, don't set this for kernel breakpoints
 266         */
 267
 268         /* TODO: check to see if we are in some sort of deferred HWERR
 269          * that we should be able to recover from, not kernel panic
 270          */
 271         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
 272 #ifdef CONFIG_KGDB
 273                 && (trapnr != VEC_EXCPT02)
 274 #endif
 275         ){
 276                 console_verbose();
 277                 oops_in_progress = 1;
 278         } else if (current) {
 279                 if (current->mm == NULL) {
 280                         console_verbose();
 281                         oops_in_progress = 1;
 282                 }
 283         }
 284
 285         /* trap_c() will be called for exceptions. During exceptions
 286          * processing, the pc value should be set with retx value.
 287          * With this change we can cleanup some code in signal.c- TODO
 288          */
 289         fp->orig_pc = fp->retx;
 290         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 291                 trapnr, fp->ipend, fp->pc, fp->retx); */
 292
 293         /* send the appropriate signal to the user program */
 294         switch (trapnr) {
 295
 296         /* This table works in conjuction with the one in ./mach-common/entry.S
 297          * Some exceptions are handled there (in assembly, in exception space)
 298          * Some are handled here, (in C, in interrupt space)
 299          * Some, like CPLB, are handled in both, where the normal path is
 300          * handled in assembly/exception space, and the error path is handled
 301          * here
 302          */
 303
 304         /* 0x00 - Linux Syscall, getting here is an error */
 305         /* 0x01 - userspace gdb breakpoint, handled here */
 306         case VEC_EXCPT01:
 307                 info.si_code = TRAP_ILLTRAP;
 308                 sig = SIGTRAP;
 309                 CHK_DEBUGGER_TRAP_MAYBE();
 310                 /* Check if this is a breakpoint in kernel space */
 311                 if (fp->ipend & 0xffc0)
 312                         return;
 313                 else
 314                         break;
 315         /* 0x03 - User Defined, userspace stack overflow */
 316         case VEC_EXCPT03:
 317                 info.si_code = SEGV_STACKFLOW;
 318                 sig = SIGSEGV;
 319                 verbose_printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
 320                 CHK_DEBUGGER_TRAP_MAYBE();
 321                 break;
 322         /* 0x02 - KGDB initial connection and break signal trap */
 323         case VEC_EXCPT02:
 324 #ifdef CONFIG_KGDB
 325                 info.si_code = TRAP_ILLTRAP;
 326                 sig = SIGTRAP;
 327                 CHK_DEBUGGER_TRAP();
 328                 return;
 329 #endif
 330         /* 0x04 - User Defined */
 331         /* 0x05 - User Defined */
 332         /* 0x06 - User Defined */
 333         /* 0x07 - User Defined */
 334         /* 0x08 - User Defined */
 335         /* 0x09 - User Defined */
 336         /* 0x0A - User Defined */
 337         /* 0x0B - User Defined */
 338         /* 0x0C - User Defined */
 339         /* 0x0D - User Defined */
 340         /* 0x0E - User Defined */
 341         /* 0x0F - User Defined */
 342         /* If we got here, it is most likely that someone was trying to use a
 343          * custom exception handler, and it is not actually installed properly
 344          */
 345         case VEC_EXCPT04 ... VEC_EXCPT15:
 346                 info.si_code = ILL_ILLPARAOP;
 347                 sig = SIGILL;
 348                 verbose_printk(KERN_NOTICE EXC_0x04(KERN_NOTICE));
 349                 CHK_DEBUGGER_TRAP_MAYBE();
 350                 break;
 351         /* 0x10 HW Single step, handled here */
 352         case VEC_STEP:
 353                 info.si_code = TRAP_STEP;
 354                 sig = SIGTRAP;
 355                 CHK_DEBUGGER_TRAP_MAYBE();
 356                 /* Check if this is a single step in kernel space */
 357                 if (fp->ipend & 0xffc0)
 358                         return;
 359                 else
 360                         break;
 361         /* 0x11 - Trace Buffer Full, handled here */
 362         case VEC_OVFLOW:
 363                 info.si_code = TRAP_TRACEFLOW;
 364                 sig = SIGTRAP;
 365                 verbose_printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
 366                 CHK_DEBUGGER_TRAP_MAYBE();
 367                 break;
 368         /* 0x12 - Reserved, Caught by default */
 369         /* 0x13 - Reserved, Caught by default */
 370         /* 0x14 - Reserved, Caught by default */
 371         /* 0x15 - Reserved, Caught by default */
 372         /* 0x16 - Reserved, Caught by default */
 373         /* 0x17 - Reserved, Caught by default */
 374         /* 0x18 - Reserved, Caught by default */
 375         /* 0x19 - Reserved, Caught by default */
 376         /* 0x1A - Reserved, Caught by default */
 377         /* 0x1B - Reserved, Caught by default */
 378         /* 0x1C - Reserved, Caught by default */
 379         /* 0x1D - Reserved, Caught by default */
 380         /* 0x1E - Reserved, Caught by default */
 381         /* 0x1F - Reserved, Caught by default */
 382         /* 0x20 - Reserved, Caught by default */
 383         /* 0x21 - Undefined Instruction, handled here */
 384         case VEC_UNDEF_I:
 385                 info.si_code = ILL_ILLOPC;
 386                 sig = SIGILL;
 387                 verbose_printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
 388                 CHK_DEBUGGER_TRAP_MAYBE();
 389                 break;
 390         /* 0x22 - Illegal Instruction Combination, handled here */
 391         case VEC_ILGAL_I:
 392                 info.si_code = ILL_ILLPARAOP;
 393                 sig = SIGILL;
 394                 verbose_printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
 395                 CHK_DEBUGGER_TRAP_MAYBE();
 396                 break;
 397         /* 0x23 - Data CPLB protection violation, handled here */
 398         case VEC_CPLB_VL:
 399                 info.si_code = ILL_CPLB_VI;
 400                 sig = SIGBUS;
 401                 verbose_printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
 402                 CHK_DEBUGGER_TRAP_MAYBE();
 403                 break;
 404         /* 0x24 - Data access misaligned, handled here */
 405         case VEC_MISALI_D:
 406                 info.si_code = BUS_ADRALN;
 407                 sig = SIGBUS;
 408                 verbose_printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
 409                 CHK_DEBUGGER_TRAP_MAYBE();
 410                 break;
 411         /* 0x25 - Unrecoverable Event, handled here */
 412         case VEC_UNCOV:
 413                 info.si_code = ILL_ILLEXCPT;
 414                 sig = SIGILL;
 415                 verbose_printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
 416                 CHK_DEBUGGER_TRAP_MAYBE();
 417                 break;
 418         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 419                 error case is handled here */
 420         case VEC_CPLB_M:
 421                 info.si_code = BUS_ADRALN;
 422                 sig = SIGBUS;
 423                 verbose_printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
 424                 break;
 425         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 426         case VEC_CPLB_MHIT:
 427                 info.si_code = ILL_CPLB_MULHIT;
 428                 sig = SIGSEGV;
 429 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 430                 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
 431                         verbose_printk(KERN_NOTICE "NULL pointer access\n");
 432                 else
 433 #endif
 434                         verbose_printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
 435                 CHK_DEBUGGER_TRAP_MAYBE();
 436                 break;
 437         /* 0x28 - Emulation Watchpoint, handled here */
 438         case VEC_WATCH:
 439                 info.si_code = TRAP_WATCHPT;
 440                 sig = SIGTRAP;
 441                 pr_debug(EXC_0x28(KERN_DEBUG));
 442                 CHK_DEBUGGER_TRAP_MAYBE();
 443                 /* Check if this is a watchpoint in kernel space */
 444                 if (fp->ipend & 0xffc0)
 445                         return;
 446                 else
 447                         break;
 448 #ifdef CONFIG_BF535
 449         /* 0x29 - Instruction fetch access error (535 only) */
 450         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 451                 info.si_code = BUS_OPFETCH;
 452                 sig = SIGBUS;
 453                 verbose_printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 454                 CHK_DEBUGGER_TRAP_MAYBE();
 455                 break;
 456 #else
 457         /* 0x29 - Reserved, Caught by default */
 458 #endif
 459         /* 0x2A - Instruction fetch misaligned, handled here */
 460         case VEC_MISALI_I:
 461                 info.si_code = BUS_ADRALN;
 462                 sig = SIGBUS;
 463                 verbose_printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
 464                 CHK_DEBUGGER_TRAP_MAYBE();
 465                 break;
 466         /* 0x2B - Instruction CPLB protection violation, handled here */
 467         case VEC_CPLB_I_VL:
 468                 info.si_code = ILL_CPLB_VI;
 469                 sig = SIGBUS;
 470                 verbose_printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
 471                 CHK_DEBUGGER_TRAP_MAYBE();
 472                 break;
 473         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 474         case VEC_CPLB_I_M:
 475                 info.si_code = ILL_CPLB_MISS;
 476                 sig = SIGBUS;
 477                 verbose_printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
 478                 break;
 479         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 480         case VEC_CPLB_I_MHIT:
 481                 info.si_code = ILL_CPLB_MULHIT;
 482                 sig = SIGSEGV;
 483 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 484                 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
 485                         verbose_printk(KERN_NOTICE "Jump to NULL address\n");
 486                 else
 487 #endif
 488                         verbose_printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
 489                 CHK_DEBUGGER_TRAP_MAYBE();
 490                 break;
 491         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 492         case VEC_ILL_RES:
 493                 info.si_code = ILL_PRVOPC;
 494                 sig = SIGILL;
 495                 verbose_printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
 496                 CHK_DEBUGGER_TRAP_MAYBE();
 497                 break;
 498         /* 0x2F - Reserved, Caught by default */
 499         /* 0x30 - Reserved, Caught by default */
 500         /* 0x31 - Reserved, Caught by default */
 501         /* 0x32 - Reserved, Caught by default */
 502         /* 0x33 - Reserved, Caught by default */
 503         /* 0x34 - Reserved, Caught by default */
 504         /* 0x35 - Reserved, Caught by default */
 505         /* 0x36 - Reserved, Caught by default */
 506         /* 0x37 - Reserved, Caught by default */
 507         /* 0x38 - Reserved, Caught by default */
 508         /* 0x39 - Reserved, Caught by default */
 509         /* 0x3A - Reserved, Caught by default */
 510         /* 0x3B - Reserved, Caught by default */
 511         /* 0x3C - Reserved, Caught by default */
 512         /* 0x3D - Reserved, Caught by default */
 513         /* 0x3E - Reserved, Caught by default */
 514         /* 0x3F - Reserved, Caught by default */
 515         case VEC_HWERR:
 516                 info.si_code = BUS_ADRALN;
 517                 sig = SIGBUS;
 518                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 519                 /* System MMR Error */
 520                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 521                         info.si_code = BUS_ADRALN;
 522                         sig = SIGBUS;
 523                         verbose_printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
 524                         break;
 525                 /* External Memory Addressing Error */
 526                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 527                         info.si_code = BUS_ADRERR;
 528                         sig = SIGBUS;
 529                         verbose_printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
 530                         break;
 531                 /* Performance Monitor Overflow */
 532                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 533                         verbose_printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
 534                         break;
 535                 /* RAISE 5 instruction */
 536                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 537                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 538                         break;
 539                 default:        /* Reserved */
 540                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 541                         break;
 542                 }
 543                 CHK_DEBUGGER_TRAP_MAYBE();
 544                 break;
 545         /*
 546          * We should be handling all known exception types above,
 547          * if we get here we hit a reserved one, so panic
 548          */
 549         default:
 550                 oops_in_progress = 1;
 551                 info.si_code = ILL_ILLPARAOP;
 552                 sig = SIGILL;
 553                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 554                         (fp->seqstat & SEQSTAT_EXCAUSE));
 555                 CHK_DEBUGGER_TRAP_MAYBE();
 556                 break;
 557         }
 558
 559         BUG_ON(sig == 0);
 560
 561         if (sig != SIGTRAP) {
 562                 dump_bfin_process(fp);
 563                 dump_bfin_mem(fp);
 564                 show_regs(fp);
 565
 566                 /* Print out the trace buffer if it makes sense */
 567 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 568                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 569                         verbose_printk(KERN_NOTICE "No trace since you do not have "
 570                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 571                                 KERN_NOTICE "\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 "\n" 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                 fp->pc = SAFE_USER_INSTRUCTION;
 609
 610         trace_buffer_restore(j);
 611         return;
 612 }
 613
 614 /* Typical exception handling routines  */
 615
 616 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 617
 618 /*
 619  * Similar to get_user, do some address checking, then dereference
 620  * Return true on sucess, false on bad address
 621  */
 622 static bool get_instruction(unsigned short *val, unsigned short *address)
 623 {
 624
 625         unsigned long addr;
 626
 627         addr = (unsigned long)address;
 628
 629         /* Check for odd addresses */
 630         if (addr & 0x1)
 631                 return false;
 632
 633         /* Check that things do not wrap around */
 634         if (addr > (addr + 2))
 635                 return false;
 636
 637         /*
 638          * Since we are in exception context, we need to do a little address checking
 639          * We need to make sure we are only accessing valid memory, and
 640          * we don't read something in the async space that can hang forever
 641          */
 642         if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
 643 #if L2_LENGTH != 0
 644             (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
 645 #endif
 646             (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||
 647 #if L1_DATA_A_LENGTH != 0
 648             (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) ||
 649 #endif
 650 #if L1_DATA_B_LENGTH != 0
 651             (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) ||
 652 #endif
 653             (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) ||
 654             (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) &&
 655                addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) ||
 656             (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) &&
 657                addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) ||
 658             (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) &&
 659                addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) ||
 660             (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) &&
 661               addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) {
 662                 *val = *address;
 663                 return true;
 664         }
 665
 666 #if L1_CODE_LENGTH != 0
 667         if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) {
 668                 isram_memcpy(val, address, 2);
 669                 return true;
 670         }
 671 #endif
 672
 673
 674         return false;
 675 }
 676
 677 /*
 678  * decode the instruction if we are printing out the trace, as it
 679  * makes things easier to follow, without running it through objdump
 680  * These are the normal instructions which cause change of flow, which
 681  * would be at the source of the trace buffer
 682  */
 683 #if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
 684 static void decode_instruction(unsigned short *address)
 685 {
 686         unsigned short opcode;
 687
 688         if (get_instruction(&opcode, address)) {
 689                 if (opcode == 0x0010)
 690                         verbose_printk("RTS");
 691                 else if (opcode == 0x0011)
 692                         verbose_printk("RTI");
 693                 else if (opcode == 0x0012)
 694                         verbose_printk("RTX");
 695                 else if (opcode == 0x0013)
 696                         verbose_printk("RTN");
 697                 else if (opcode == 0x0014)
 698                         verbose_printk("RTE");
 699                 else if (opcode == 0x0025)
 700                         verbose_printk("EMUEXCPT");
 701                 else if (opcode == 0x0040 && opcode <= 0x0047)
 702                         verbose_printk("STI R%i", opcode & 7);
 703                 else if (opcode >= 0x0050 && opcode <= 0x0057)
 704                         verbose_printk("JUMP (P%i)", opcode & 7);
 705                 else if (opcode >= 0x0060 && opcode <= 0x0067)
 706                         verbose_printk("CALL (P%i)", opcode & 7);
 707                 else if (opcode >= 0x0070 && opcode <= 0x0077)
 708                         verbose_printk("CALL (PC+P%i)", opcode & 7);
 709                 else if (opcode >= 0x0080 && opcode <= 0x0087)
 710                         verbose_printk("JUMP (PC+P%i)", opcode & 7);
 711                 else if (opcode >= 0x0090 && opcode <= 0x009F)
 712                         verbose_printk("RAISE 0x%x", opcode & 0xF);
 713                 else if (opcode >= 0x00A0 && opcode <= 0x00AF)
 714                         verbose_printk("EXCPT 0x%x", opcode & 0xF);
 715                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
 716                         verbose_printk("IF !CC JUMP");
 717                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
 718                         verbose_printk("IF CC JUMP");
 719                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
 720                         verbose_printk("JUMP.S");
 721                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
 722                         verbose_printk("LSETUP");
 723                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
 724                         verbose_printk("JUMP.L");
 725                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
 726                         verbose_printk("CALL pcrel");
 727                 else
 728                         verbose_printk("0x%04x", opcode);
 729         }
 730
 731 }
 732 #endif
 733
 734 void dump_bfin_trace_buffer(void)
 735 {
 736 #ifdef CONFIG_DEBUG_VERBOSE
 737 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 738         int tflags, i = 0;
 739         char buf[150];
 740         unsigned short *addr;
 741 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 742         int j, index;
 743 #endif
 744
 745         trace_buffer_save(tflags);
 746
 747         printk(KERN_NOTICE "Hardware Trace:\n");
 748
 749 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 750         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
 751 #endif
 752
 753         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 754                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 755                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 756                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 757                         addr = (unsigned short *)bfin_read_TBUF();
 758                         decode_address(buf, (unsigned long)addr);
 759                         printk(KERN_NOTICE "     Source : %s ", buf);
 760                         decode_instruction(addr);
 761                         printk("\n");
 762                 }
 763         }
 764
 765 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 766         if (trace_buff_offset)
 767                 index = trace_buff_offset / 4;
 768         else
 769                 index = EXPAND_LEN;
 770
 771         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 772         while (j) {
 773                 decode_address(buf, software_trace_buff[index]);
 774                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 775                 index -= 1;
 776                 if (index < 0 )
 777                         index = EXPAND_LEN;
 778                 decode_address(buf, software_trace_buff[index]);
 779                 printk(KERN_NOTICE "     Source : %s ", buf);
 780                 decode_instruction((unsigned short *)software_trace_buff[index]);
 781                 printk("\n");
 782                 index -= 1;
 783                 if (index < 0)
 784                         index = EXPAND_LEN;
 785                 j--;
 786                 i++;
 787         }
 788 #endif
 789
 790         trace_buffer_restore(tflags);
 791 #endif
 792 #endif
 793 }
 794 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 795
 796 /*
 797  * Checks to see if the address pointed to is either a
 798  * 16-bit CALL instruction, or a 32-bit CALL instruction
 799  */
 800 static bool is_bfin_call(unsigned short *addr)
 801 {
 802         unsigned short opcode = 0, *ins_addr;
 803         ins_addr = (unsigned short *)addr;
 804
 805         if (!get_instruction(&opcode, ins_addr))
 806                 return false;
 807
 808         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
 809             (opcode >= 0x0070 && opcode <= 0x0077))
 810                 return true;
 811
 812         ins_addr--;
 813         if (!get_instruction(&opcode, ins_addr))
 814                 return false;
 815
 816         if (opcode >= 0xE300 && opcode <= 0xE3FF)
 817                 return true;
 818
 819         return false;
 820
 821 }
 822
 823 void show_stack(struct task_struct *task, unsigned long *stack)
 824 {
 825 #ifdef CONFIG_PRINTK
 826         unsigned int *addr, *endstack, *fp = 0, *frame;
 827         unsigned short *ins_addr;
 828         char buf[150];
 829         unsigned int i, j, ret_addr, frame_no = 0;
 830
 831         /*
 832          * If we have been passed a specific stack, use that one otherwise
 833          *    if we have been passed a task structure, use that, otherwise
 834          *    use the stack of where the variable "stack" exists
 835          */
 836
 837         if (stack == NULL) {
 838                 if (task) {
 839                         /* We know this is a kernel stack, so this is the start/end */
 840                         stack = (unsigned long *)task->thread.ksp;
 841                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
 842                 } else {
 843                         /* print out the existing stack info */
 844                         stack = (unsigned long *)&stack;
 845                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 846                 }
 847         } else
 848                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 849
 850         printk(KERN_NOTICE "Stack info:\n");
 851         decode_address(buf, (unsigned int)stack);
 852         printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
 853
 854         if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
 855                 printk(KERN_NOTICE "Invalid stack pointer\n");
 856                 return;
 857         }
 858
 859         /* First thing is to look for a frame pointer */
 860         for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
 861                 if (*addr & 0x1)
 862                         continue;
 863                 ins_addr = (unsigned short *)*addr;
 864                 ins_addr--;
 865                 if (is_bfin_call(ins_addr))
 866                         fp = addr - 1;
 867
 868                 if (fp) {
 869                         /* Let's check to see if it is a frame pointer */
 870                         while (fp >= (addr - 1) && fp < endstack
 871                                && fp && ((unsigned int) fp & 0x3) == 0)
 872                                 fp = (unsigned int *)*fp;
 873                         if (fp == 0 || fp == endstack) {
 874                                 fp = addr - 1;
 875                                 break;
 876                         }
 877                         fp = 0;
 878                 }
 879         }
 880         if (fp) {
 881                 frame = fp;
 882                 printk(KERN_NOTICE " FP: (0x%p)\n", fp);
 883         } else
 884                 frame = 0;
 885
 886         /*
 887          * Now that we think we know where things are, we
 888          * walk the stack again, this time printing things out
 889          * incase there is no frame pointer, we still look for
 890          * valid return addresses
 891          */
 892
 893         /* First time print out data, next time, print out symbols */
 894         for (j = 0; j <= 1; j++) {
 895                 if (j)
 896                         printk(KERN_NOTICE "Return addresses in stack:\n");
 897                 else
 898                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
 899
 900                 fp = frame;
 901                 frame_no = 0;
 902
 903                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 904                      addr <= endstack; addr++, i++) {
 905
 906                         ret_addr = 0;
 907                         if (!j && i % 8 == 0)
 908                                 printk("\n" KERN_NOTICE "%p:",addr);
 909
 910                         /* if it is an odd address, or zero, just skip it */
 911                         if (*addr & 0x1 || !*addr)
 912                                 goto print;
 913
 914                         ins_addr = (unsigned short *)*addr;
 915
 916                         /* Go back one instruction, and see if it is a CALL */
 917                         ins_addr--;
 918                         ret_addr = is_bfin_call(ins_addr);
 919  print:
 920                         if (!j && stack == (unsigned long *)addr)
 921                                 printk("[%08x]", *addr);
 922                         else if (ret_addr)
 923                                 if (j) {
 924                                         decode_address(buf, (unsigned int)*addr);
 925                                         if (frame == addr) {
 926                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
 927                                                 continue;
 928                                         }
 929                                         printk(KERN_NOTICE "    address : %s\n", buf);
 930                                 } else
 931                                         printk("<%08x>", *addr);
 932                         else if (fp == addr) {
 933                                 if (j)
 934                                         frame = addr+1;
 935                                 else
 936                                         printk("(%08x)", *addr);
 937
 938                                 fp = (unsigned int *)*addr;
 939                                 frame_no++;
 940
 941                         } else if (!j)
 942                                 printk(" %08x ", *addr);
 943                 }
 944                 if (!j)
 945                         printk("\n");
 946         }
 947 #endif
 948 }
 949
 950 void dump_stack(void)
 951 {
 952         unsigned long stack;
 953 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 954         int tflags;
 955 #endif
 956         trace_buffer_save(tflags);
 957         dump_bfin_trace_buffer();
 958         show_stack(current, &stack);
 959         trace_buffer_restore(tflags);
 960 }
 961 EXPORT_SYMBOL(dump_stack);
 962
 963 void dump_bfin_process(struct pt_regs *fp)
 964 {
 965 #ifdef CONFIG_DEBUG_VERBOSE
 966         /* We should be able to look at fp->ipend, but we don't push it on the
 967          * stack all the time, so do this until we fix that */
 968         unsigned int context = bfin_read_IPEND();
 969
 970         if (oops_in_progress)
 971                 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
 972
 973         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 974                 verbose_printk(KERN_NOTICE "HW Error context\n");
 975         else if (context & 0x0020)
 976                 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
 977         else if (context & 0x3FC0)
 978                 verbose_printk(KERN_NOTICE "Interrupt context\n");
 979         else if (context & 0x4000)
 980                 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
 981         else if (context & 0x8000)
 982                 verbose_printk(KERN_NOTICE "Kernel process context\n");
 983
 984         /* Because we are crashing, and pointers could be bad, we check things
 985          * pretty closely before we use them
 986          */
 987         if ((unsigned long)current >= FIXED_CODE_START &&
 988             !((unsigned long)current & 0x3) && current->pid) {
 989                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
 990                 if (current->comm >= (char *)FIXED_CODE_START)
 991                         verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
 992                                 current->comm, current->pid);
 993                 else
 994                         verbose_printk(KERN_NOTICE "COMM= invalid\n");
 995
 996                 printk(KERN_NOTICE "CPU = %d\n", current_thread_info()->cpu);
 997                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
 998                         verbose_printk(KERN_NOTICE  "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
 999                                 KERN_NOTICE " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n"
1000                                 KERN_NOTICE "\n",
1001                                 (void *)current->mm->start_code,
1002                                 (void *)current->mm->end_code,
1003                                 (void *)current->mm->start_data,
1004                                 (void *)current->mm->end_data,
1005                                 (void *)current->mm->end_data,
1006                                 (void *)current->mm->brk,
1007                                 (void *)current->mm->start_stack);
1008                 else
1009                         verbose_printk(KERN_NOTICE "invalid mm\n");
1010         } else
1011                 verbose_printk(KERN_NOTICE "\n" KERN_NOTICE
1012                      "No Valid process in current context\n");
1013 #endif
1014 }
1015
1016 void dump_bfin_mem(struct pt_regs *fp)
1017 {
1018 #ifdef CONFIG_DEBUG_VERBOSE
1019         unsigned short *addr, *erraddr, val = 0, err = 0;
1020         char sti = 0, buf[6];
1021
1022         erraddr = (void *)fp->pc;
1023
1024         verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
1025
1026         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
1027              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
1028              addr++) {
1029                 if (!((unsigned long)addr & 0xF))
1030                         verbose_printk("\n" KERN_NOTICE "0x%p: ", addr);
1031
1032                 if (!get_instruction(&val, addr)) {
1033                                 val = 0;
1034                                 sprintf(buf, "????");
1035                 } else
1036                         sprintf(buf, "%04x", val);
1037
1038                 if (addr == erraddr) {
1039                         verbose_printk("[%s]", buf);
1040                         err = val;
1041                 } else
1042                         verbose_printk(" %s ", buf);
1043
1044                 /* Do any previous instructions turn on interrupts? */
1045                 if (addr <= erraddr &&                          /* in the past */
1046                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
1047                       val == 0x017b))                           /* [SP++] = RETI */
1048                         sti = 1;
1049         }
1050
1051         verbose_printk("\n");
1052
1053         /* Hardware error interrupts can be deferred */
1054         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1055             oops_in_progress)){
1056                 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1057 #ifndef CONFIG_DEBUG_HWERR
1058                 verbose_printk(KERN_NOTICE "The remaining message may be meaningless\n"
1059                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
1060                          " better idea where it came from\n");
1061 #else
1062                 /* If we are handling only one peripheral interrupt
1063                  * and current mm and pid are valid, and the last error
1064                  * was in that user space process's text area
1065                  * print it out - because that is where the problem exists
1066                  */
1067                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1068                      (current->pid && current->mm)) {
1069                         /* And the last RETI points to the current userspace context */
1070                         if ((fp + 1)->pc >= current->mm->start_code &&
1071                             (fp + 1)->pc <= current->mm->end_code) {
1072                                 verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
1073                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1074                                 show_regs(fp + 1);
1075                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1076                         }
1077                 }
1078 #endif
1079         }
1080 #endif
1081 }
1082
1083 void show_regs(struct pt_regs *fp)
1084 {
1085 #ifdef CONFIG_DEBUG_VERBOSE
1086         char buf [150];
1087         struct irqaction *action;
1088         unsigned int i;
1089         unsigned long flags = 0;
1090         unsigned int cpu = smp_processor_id();
1091         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
1092
1093         verbose_printk(KERN_NOTICE "\n");
1094         if (CPUID != bfin_cpuid())
1095                 verbose_printk(KERN_NOTICE "Compiled for cpu family 0x%04x (Rev %d), "
1096                         "but running on:0x%04x (Rev %d)\n",
1097                         CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid());
1098
1099         verbose_printk(KERN_NOTICE "ADSP-%s-0.%d",
1100                 CPU, bfin_compiled_revid());
1101
1102         if (bfin_compiled_revid() !=  bfin_revid())
1103                 verbose_printk("(Detected 0.%d)", bfin_revid());
1104
1105         verbose_printk(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n",
1106                 get_cclk()/1000000, get_sclk()/1000000,
1107 #ifdef CONFIG_MPU
1108                 "mpu on"
1109 #else
1110                 "mpu off"
1111 #endif
1112                 );
1113
1114         verbose_printk(KERN_NOTICE "%s", linux_banner);
1115
1116         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
1117         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
1118                 (long)fp->seqstat, fp->ipend, fp->syscfg);
1119         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1120                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1121                         (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1122 #ifdef EBIU_ERRMST
1123                 /* If the error was from the EBIU, print it out */
1124                 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1125                         verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
1126                                 bfin_read_EBIU_ERRMST());
1127                         verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
1128                                 bfin_read_EBIU_ERRADD());
1129                 }
1130 #endif
1131         }
1132         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1133                 fp->seqstat & SEQSTAT_EXCAUSE);
1134         for (i = 2; i <= 15 ; i++) {
1135                 if (fp->ipend & (1 << i)) {
1136                         if (i != 4) {
1137                                 decode_address(buf, bfin_read32(EVT0 + 4*i));
1138                                 verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1139                         } else
1140                                 verbose_printk(KERN_NOTICE "  interrupts disabled\n");
1141                 }
1142         }
1143
1144         /* if no interrupts are going off, don't print this out */
1145         if (fp->ipend & ~0x3F) {
1146                 for (i = 0; i < (NR_IRQS - 1); i++) {
1147                         if (!in_atomic)
1148                                 spin_lock_irqsave(&irq_desc[i].lock, flags);
1149
1150                         action = irq_desc[i].action;
1151                         if (!action)
1152                                 goto unlock;
1153
1154                         decode_address(buf, (unsigned int)action->handler);
1155                         verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1156                         for (action = action->next; action; action = action->next) {
1157                                 decode_address(buf, (unsigned int)action->handler);
1158                                 verbose_printk(", %s", buf);
1159                         }
1160                         verbose_printk("\n");
1161 unlock:
1162                         if (!in_atomic)
1163                                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1164                 }
1165         }
1166
1167         decode_address(buf, fp->rete);
1168         verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1169         decode_address(buf, fp->retn);
1170         verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1171         decode_address(buf, fp->retx);
1172         verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1173         decode_address(buf, fp->rets);
1174         verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1175         decode_address(buf, fp->pc);
1176         verbose_printk(KERN_NOTICE " PC  : %s\n", buf);
1177
1178         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1179             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1180                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
1181                 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1182                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
1183                 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1184         }
1185
1186         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
1187         verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1188                 fp->r0, fp->r1, fp->r2, fp->r3);
1189         verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1190                 fp->r4, fp->r5, fp->r6, fp->r7);
1191         verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1192                 fp->p0, fp->p1, fp->p2, fp->p3);
1193         verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1194                 fp->p4, fp->p5, fp->fp, (long)fp);
1195         verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1196                 fp->lb0, fp->lt0, fp->lc0);
1197         verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1198                 fp->lb1, fp->lt1, fp->lc1);
1199         verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1200                 fp->b0, fp->l0, fp->m0, fp->i0);
1201         verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1202                 fp->b1, fp->l1, fp->m1, fp->i1);
1203         verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1204                 fp->b2, fp->l2, fp->m2, fp->i2);
1205         verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1206                 fp->b3, fp->l3, fp->m3, fp->i3);
1207         verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1208                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1209
1210         verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1211                 rdusp(), fp->astat);
1212
1213         verbose_printk(KERN_NOTICE "\n");
1214 #endif
1215 }
1216
1217 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1218 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1219 #endif
1220
1221 static DEFINE_SPINLOCK(bfin_spinlock_lock);
1222
1223 asmlinkage int sys_bfin_spinlock(int *p)
1224 {
1225         int ret, tmp = 0;
1226
1227         spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
1228         ret = get_user(tmp, p);
1229         if (likely(ret == 0)) {
1230                 if (unlikely(tmp))
1231                         ret = 1;
1232                 else
1233                         put_user(1, p);
1234         }
1235         spin_unlock(&bfin_spinlock_lock);
1236         return ret;
1237 }
1238
1239 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1240 {
1241         void (*curr_handler)(void);
1242
1243         if (exception > 0x3F)
1244                 return -EINVAL;
1245
1246         curr_handler = ex_table[exception];
1247
1248         if (curr_handler != ex_replaceable)
1249                 return -EBUSY;
1250
1251         ex_table[exception] = handler;
1252
1253         return 0;
1254 }
1255 EXPORT_SYMBOL(bfin_request_exception);
1256
1257 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1258 {
1259         void (*curr_handler)(void);
1260
1261         if (exception > 0x3F)
1262                 return -EINVAL;
1263
1264         curr_handler = ex_table[exception];
1265
1266         if (curr_handler != handler)
1267                 return -EBUSY;
1268
1269         ex_table[exception] = ex_replaceable;
1270
1271         return 0;
1272 }
1273 EXPORT_SYMBOL(bfin_free_exception);
1274
1275 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1276 {
1277         switch (cplb_panic) {
1278         case CPLB_NO_UNLOCKED:
1279                 printk(KERN_EMERG "All CPLBs are locked\n");
1280                 break;
1281         case CPLB_PROT_VIOL:
1282                 return;
1283         case CPLB_NO_ADDR_MATCH:
1284                 return;
1285         case CPLB_UNKNOWN_ERR:
1286                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1287                 break;
1288         }
1289
1290         oops_in_progress = 1;
1291
1292         dump_bfin_process(fp);
1293         dump_bfin_mem(fp);
1294         show_regs(fp);
1295         dump_stack();
1296         panic("Unrecoverable event");
1297 }