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 <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 task_struct *p;
  90         struct mm_struct *mm;
  91         unsigned long flags, offset;
  92         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
  93         struct rb_node *n;
  94
  95 #ifdef CONFIG_KALLSYMS
  96         unsigned long symsize;
  97         const char *symname;
  98         char *modname;
  99         char *delim = ":";
 100         char namebuf[128];
 101
 102         /* look up the address and see if we are in kernel space */
 103         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
 104
 105         if (symname) {
 106                 /* yeah! kernel space! */
 107                 if (!modname)
 108                         modname = delim = "";
 109                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
 110                               (void *)address, delim, modname, delim, symname,
 111                               (unsigned long)offset);
 112                 return;
 113
 114         }
 115 #endif
 116
 117         /* Problem in fixed code section? */
 118         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 119                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
 120                 return;
 121         }
 122
 123         /* Problem somewhere before the kernel start address */
 124         if (address < CONFIG_BOOT_LOAD) {
 125                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
 126                 return;
 127         }
 128
 129         /* looks like we're off in user-land, so let's walk all the
 130          * mappings of all our processes and see if we can't be a whee
 131          * bit more specific
 132          */
 133         write_lock_irqsave(&tasklist_lock, flags);
 134         for_each_process(p) {
 135                 mm = (in_atomic ? p->mm : get_task_mm(p));
 136                 if (!mm)
 137                         continue;
 138
 139                 for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
 140                         struct vm_area_struct *vma;
 141
 142                         vma = rb_entry(n, struct vm_area_struct, vm_rb);
 143
 144                         if (address >= vma->vm_start && address < vma->vm_end) {
 145                                 char _tmpbuf[256];
 146                                 char *name = p->comm;
 147                                 struct file *file = vma->vm_file;
 148
 149                                 if (file) {
 150                                         char *d_name = d_path(&file->f_path, _tmpbuf,
 151                                                       sizeof(_tmpbuf));
 152                                         if (!IS_ERR(d_name))
 153                                                 name = d_name;
 154                                 }
 155
 156                                 /* FLAT does not have its text aligned to the start of
 157                                  * the map while FDPIC ELF does ...
 158                                  */
 159
 160                                 /* before we can check flat/fdpic, we need to
 161                                  * make sure current is valid
 162                                  */
 163                                 if ((unsigned long)current >= FIXED_CODE_START &&
 164                                     !((unsigned long)current & 0x3)) {
 165                                         if (current->mm &&
 166                                             (address > current->mm->start_code) &&
 167                                             (address < current->mm->end_code))
 168                                                 offset = address - current->mm->start_code;
 169                                         else
 170                                                 offset = (address - vma->vm_start) +
 171                                                          (vma->vm_pgoff << PAGE_SHIFT);
 172
 173                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 174                                                 (void *)address, name, offset);
 175                                 } else
 176                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
 177                                                 (void *)address, name,
 178                                                 vma->vm_start, vma->vm_end);
 179
 180                                 if (!in_atomic)
 181                                         mmput(mm);
 182
 183                                 if (!strlen(buf))
 184                                         sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
 185
 186                                 goto done;
 187                         }
 188                 }
 189                 if (!in_atomic)
 190                         mmput(mm);
 191         }
 192
 193         /* we were unable to find this address anywhere */
 194         sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
 195
 196 done:
 197         write_unlock_irqrestore(&tasklist_lock, flags);
 198 #else
 199         sprintf(buf, " ");
 200 #endif
 201 }
 202
 203 asmlinkage void double_fault_c(struct pt_regs *fp)
 204 {
 205 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 206         int j;
 207         trace_buffer_save(j);
 208 #endif
 209
 210         console_verbose();
 211         oops_in_progress = 1;
 212 #ifdef CONFIG_DEBUG_VERBOSE
 213         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 214 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 215         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 216                 unsigned int cpu = smp_processor_id();
 217                 char buf[150];
 218                 decode_address(buf, cpu_pda[cpu].retx);
 219                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 220                         (unsigned int)cpu_pda[cpu].seqstat & SEQSTAT_EXCAUSE, buf);
 221                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
 222                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 223                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
 224                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 225
 226                 decode_address(buf, fp->retx);
 227                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
 228         } else
 229 #endif
 230         {
 231                 dump_bfin_process(fp);
 232                 dump_bfin_mem(fp);
 233                 show_regs(fp);
 234                 dump_bfin_trace_buffer();
 235         }
 236 #endif
 237         panic("Double Fault - unrecoverable event");
 238
 239 }
 240
 241 asmlinkage void trap_c(struct pt_regs *fp)
 242 {
 243 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 244         int j;
 245 #endif
 246 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 247         unsigned int cpu = smp_processor_id();
 248 #endif
 249         int sig = 0;
 250         siginfo_t info;
 251         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 252
 253         trace_buffer_save(j);
 254 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
 255         last_seqstat = (u32)fp->seqstat;
 256 #endif
 257
 258         /* Important - be very careful dereferncing pointers - will lead to
 259          * double faults if the stack has become corrupt
 260          */
 261
 262         /* If the fault was caused by a kernel thread, or interrupt handler
 263          * we will kernel panic, so the system reboots.
 264          * If KGDB is enabled, don't set this for kernel breakpoints
 265         */
 266
 267         /* TODO: check to see if we are in some sort of deferred HWERR
 268          * that we should be able to recover from, not kernel panic
 269          */
 270         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
 271 #ifdef CONFIG_KGDB
 272                 && (trapnr != VEC_EXCPT02)
 273 #endif
 274         ){
 275                 console_verbose();
 276                 oops_in_progress = 1;
 277         } else if (current) {
 278                 if (current->mm == NULL) {
 279                         console_verbose();
 280                         oops_in_progress = 1;
 281                 }
 282         }
 283
 284         /* trap_c() will be called for exceptions. During exceptions
 285          * processing, the pc value should be set with retx value.
 286          * With this change we can cleanup some code in signal.c- TODO
 287          */
 288         fp->orig_pc = fp->retx;
 289         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 290                 trapnr, fp->ipend, fp->pc, fp->retx); */
 291
 292         /* send the appropriate signal to the user program */
 293         switch (trapnr) {
 294
 295         /* This table works in conjuction with the one in ./mach-common/entry.S
 296          * Some exceptions are handled there (in assembly, in exception space)
 297          * Some are handled here, (in C, in interrupt space)
 298          * Some, like CPLB, are handled in both, where the normal path is
 299          * handled in assembly/exception space, and the error path is handled
 300          * here
 301          */
 302
 303         /* 0x00 - Linux Syscall, getting here is an error */
 304         /* 0x01 - userspace gdb breakpoint, handled here */
 305         case VEC_EXCPT01:
 306                 info.si_code = TRAP_ILLTRAP;
 307                 sig = SIGTRAP;
 308                 CHK_DEBUGGER_TRAP_MAYBE();
 309                 /* Check if this is a breakpoint in kernel space */
 310                 if (fp->ipend & 0xffc0)
 311                         return;
 312                 else
 313                         break;
 314         /* 0x03 - User Defined, userspace stack overflow */
 315         case VEC_EXCPT03:
 316                 info.si_code = SEGV_STACKFLOW;
 317                 sig = SIGSEGV;
 318                 verbose_printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
 319                 CHK_DEBUGGER_TRAP_MAYBE();
 320                 break;
 321         /* 0x02 - KGDB initial connection and break signal trap */
 322         case VEC_EXCPT02:
 323 #ifdef CONFIG_KGDB
 324                 info.si_code = TRAP_ILLTRAP;
 325                 sig = SIGTRAP;
 326                 CHK_DEBUGGER_TRAP();
 327                 return;
 328 #endif
 329         /* 0x04 - User Defined */
 330         /* 0x05 - User Defined */
 331         /* 0x06 - User Defined */
 332         /* 0x07 - User Defined */
 333         /* 0x08 - User Defined */
 334         /* 0x09 - User Defined */
 335         /* 0x0A - User Defined */
 336         /* 0x0B - User Defined */
 337         /* 0x0C - User Defined */
 338         /* 0x0D - User Defined */
 339         /* 0x0E - User Defined */
 340         /* 0x0F - User Defined */
 341         /* If we got here, it is most likely that someone was trying to use a
 342          * custom exception handler, and it is not actually installed properly
 343          */
 344         case VEC_EXCPT04 ... VEC_EXCPT15:
 345                 info.si_code = ILL_ILLPARAOP;
 346                 sig = SIGILL;
 347                 verbose_printk(KERN_NOTICE EXC_0x04(KERN_NOTICE));
 348                 CHK_DEBUGGER_TRAP_MAYBE();
 349                 break;
 350         /* 0x10 HW Single step, handled here */
 351         case VEC_STEP:
 352                 info.si_code = TRAP_STEP;
 353                 sig = SIGTRAP;
 354                 CHK_DEBUGGER_TRAP_MAYBE();
 355                 /* Check if this is a single step in kernel space */
 356                 if (fp->ipend & 0xffc0)
 357                         return;
 358                 else
 359                         break;
 360         /* 0x11 - Trace Buffer Full, handled here */
 361         case VEC_OVFLOW:
 362                 info.si_code = TRAP_TRACEFLOW;
 363                 sig = SIGTRAP;
 364                 verbose_printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
 365                 CHK_DEBUGGER_TRAP_MAYBE();
 366                 break;
 367         /* 0x12 - Reserved, Caught by default */
 368         /* 0x13 - Reserved, Caught by default */
 369         /* 0x14 - Reserved, Caught by default */
 370         /* 0x15 - Reserved, Caught by default */
 371         /* 0x16 - Reserved, Caught by default */
 372         /* 0x17 - Reserved, Caught by default */
 373         /* 0x18 - Reserved, Caught by default */
 374         /* 0x19 - Reserved, Caught by default */
 375         /* 0x1A - Reserved, Caught by default */
 376         /* 0x1B - Reserved, Caught by default */
 377         /* 0x1C - Reserved, Caught by default */
 378         /* 0x1D - Reserved, Caught by default */
 379         /* 0x1E - Reserved, Caught by default */
 380         /* 0x1F - Reserved, Caught by default */
 381         /* 0x20 - Reserved, Caught by default */
 382         /* 0x21 - Undefined Instruction, handled here */
 383         case VEC_UNDEF_I:
 384                 info.si_code = ILL_ILLOPC;
 385                 sig = SIGILL;
 386                 verbose_printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
 387                 CHK_DEBUGGER_TRAP_MAYBE();
 388                 break;
 389         /* 0x22 - Illegal Instruction Combination, handled here */
 390         case VEC_ILGAL_I:
 391                 info.si_code = ILL_ILLPARAOP;
 392                 sig = SIGILL;
 393                 verbose_printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
 394                 CHK_DEBUGGER_TRAP_MAYBE();
 395                 break;
 396         /* 0x23 - Data CPLB protection violation, handled here */
 397         case VEC_CPLB_VL:
 398                 info.si_code = ILL_CPLB_VI;
 399                 sig = SIGBUS;
 400                 verbose_printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
 401                 CHK_DEBUGGER_TRAP_MAYBE();
 402                 break;
 403         /* 0x24 - Data access misaligned, handled here */
 404         case VEC_MISALI_D:
 405                 info.si_code = BUS_ADRALN;
 406                 sig = SIGBUS;
 407                 verbose_printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
 408                 CHK_DEBUGGER_TRAP_MAYBE();
 409                 break;
 410         /* 0x25 - Unrecoverable Event, handled here */
 411         case VEC_UNCOV:
 412                 info.si_code = ILL_ILLEXCPT;
 413                 sig = SIGILL;
 414                 verbose_printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
 415                 CHK_DEBUGGER_TRAP_MAYBE();
 416                 break;
 417         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 418                 error case is handled here */
 419         case VEC_CPLB_M:
 420                 info.si_code = BUS_ADRALN;
 421                 sig = SIGBUS;
 422                 verbose_printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
 423                 break;
 424         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 425         case VEC_CPLB_MHIT:
 426                 info.si_code = ILL_CPLB_MULHIT;
 427                 sig = SIGSEGV;
 428 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 429                 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
 430                         verbose_printk(KERN_NOTICE "NULL pointer access\n");
 431                 else
 432 #endif
 433                         verbose_printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
 434                 CHK_DEBUGGER_TRAP_MAYBE();
 435                 break;
 436         /* 0x28 - Emulation Watchpoint, handled here */
 437         case VEC_WATCH:
 438                 info.si_code = TRAP_WATCHPT;
 439                 sig = SIGTRAP;
 440                 pr_debug(EXC_0x28(KERN_DEBUG));
 441                 CHK_DEBUGGER_TRAP_MAYBE();
 442                 /* Check if this is a watchpoint in kernel space */
 443                 if (fp->ipend & 0xffc0)
 444                         return;
 445                 else
 446                         break;
 447 #ifdef CONFIG_BF535
 448         /* 0x29 - Instruction fetch access error (535 only) */
 449         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 450                 info.si_code = BUS_OPFETCH;
 451                 sig = SIGBUS;
 452                 verbose_printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 453                 CHK_DEBUGGER_TRAP_MAYBE();
 454                 break;
 455 #else
 456         /* 0x29 - Reserved, Caught by default */
 457 #endif
 458         /* 0x2A - Instruction fetch misaligned, handled here */
 459         case VEC_MISALI_I:
 460                 info.si_code = BUS_ADRALN;
 461                 sig = SIGBUS;
 462                 verbose_printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
 463                 CHK_DEBUGGER_TRAP_MAYBE();
 464                 break;
 465         /* 0x2B - Instruction CPLB protection violation, handled here */
 466         case VEC_CPLB_I_VL:
 467                 info.si_code = ILL_CPLB_VI;
 468                 sig = SIGBUS;
 469                 verbose_printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
 470                 CHK_DEBUGGER_TRAP_MAYBE();
 471                 break;
 472         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 473         case VEC_CPLB_I_M:
 474                 info.si_code = ILL_CPLB_MISS;
 475                 sig = SIGBUS;
 476                 verbose_printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
 477                 break;
 478         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 479         case VEC_CPLB_I_MHIT:
 480                 info.si_code = ILL_CPLB_MULHIT;
 481                 sig = SIGSEGV;
 482 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 483                 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
 484                         verbose_printk(KERN_NOTICE "Jump to NULL address\n");
 485                 else
 486 #endif
 487                         verbose_printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
 488                 CHK_DEBUGGER_TRAP_MAYBE();
 489                 break;
 490         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 491         case VEC_ILL_RES:
 492                 info.si_code = ILL_PRVOPC;
 493                 sig = SIGILL;
 494                 verbose_printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
 495                 CHK_DEBUGGER_TRAP_MAYBE();
 496                 break;
 497         /* 0x2F - Reserved, Caught by default */
 498         /* 0x30 - Reserved, Caught by default */
 499         /* 0x31 - Reserved, Caught by default */
 500         /* 0x32 - Reserved, Caught by default */
 501         /* 0x33 - Reserved, Caught by default */
 502         /* 0x34 - Reserved, Caught by default */
 503         /* 0x35 - Reserved, Caught by default */
 504         /* 0x36 - Reserved, Caught by default */
 505         /* 0x37 - Reserved, Caught by default */
 506         /* 0x38 - Reserved, Caught by default */
 507         /* 0x39 - Reserved, Caught by default */
 508         /* 0x3A - Reserved, Caught by default */
 509         /* 0x3B - Reserved, Caught by default */
 510         /* 0x3C - Reserved, Caught by default */
 511         /* 0x3D - Reserved, Caught by default */
 512         /* 0x3E - Reserved, Caught by default */
 513         /* 0x3F - Reserved, Caught by default */
 514         case VEC_HWERR:
 515                 info.si_code = BUS_ADRALN;
 516                 sig = SIGBUS;
 517                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 518                 /* System MMR Error */
 519                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 520                         info.si_code = BUS_ADRALN;
 521                         sig = SIGBUS;
 522                         verbose_printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
 523                         break;
 524                 /* External Memory Addressing Error */
 525                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 526                         info.si_code = BUS_ADRERR;
 527                         sig = SIGBUS;
 528                         verbose_printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
 529                         break;
 530                 /* Performance Monitor Overflow */
 531                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 532                         verbose_printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
 533                         break;
 534                 /* RAISE 5 instruction */
 535                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 536                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 537                         break;
 538                 default:        /* Reserved */
 539                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 540                         break;
 541                 }
 542                 CHK_DEBUGGER_TRAP_MAYBE();
 543                 break;
 544         /*
 545          * We should be handling all known exception types above,
 546          * if we get here we hit a reserved one, so panic
 547          */
 548         default:
 549                 oops_in_progress = 1;
 550                 info.si_code = ILL_ILLPARAOP;
 551                 sig = SIGILL;
 552                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 553                         (fp->seqstat & SEQSTAT_EXCAUSE));
 554                 CHK_DEBUGGER_TRAP_MAYBE();
 555                 break;
 556         }
 557
 558         BUG_ON(sig == 0);
 559
 560         if (sig != SIGTRAP) {
 561                 dump_bfin_process(fp);
 562                 dump_bfin_mem(fp);
 563                 show_regs(fp);
 564
 565                 /* Print out the trace buffer if it makes sense */
 566 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 567                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 568                         verbose_printk(KERN_NOTICE "No trace since you do not have "
 569                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 570                                 KERN_NOTICE "\n");
 571                 else
 572 #endif
 573                         dump_bfin_trace_buffer();
 574
 575                 if (oops_in_progress) {
 576                         /* Dump the current kernel stack */
 577                         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "Kernel Stack\n");
 578                         show_stack(current, NULL);
 579                         print_modules();
 580 #ifndef CONFIG_ACCESS_CHECK
 581                         verbose_printk(KERN_EMERG "Please turn on "
 582                                "CONFIG_ACCESS_CHECK\n");
 583 #endif
 584                         panic("Kernel exception");
 585                 } else {
 586 #ifdef CONFIG_DEBUG_VERBOSE
 587                         unsigned long *stack;
 588                         /* Dump the user space stack */
 589                         stack = (unsigned long *)rdusp();
 590                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
 591                         show_stack(NULL, stack);
 592 #endif
 593                 }
 594         }
 595
 596 #ifdef CONFIG_IPIPE
 597         if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
 598 #endif
 599         {
 600                 info.si_signo = sig;
 601                 info.si_errno = 0;
 602                 info.si_addr = (void __user *)fp->pc;
 603                 force_sig_info(sig, &info, current);
 604         }
 605
 606         if (ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8))
 607                 fp->pc = SAFE_USER_INSTRUCTION;
 608
 609         trace_buffer_restore(j);
 610         return;
 611 }
 612
 613 /* Typical exception handling routines  */
 614
 615 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 616
 617 /*
 618  * Similar to get_user, do some address checking, then dereference
 619  * Return true on sucess, false on bad address
 620  */
 621 static bool get_instruction(unsigned short *val, unsigned short *address)
 622 {
 623
 624         unsigned long addr;
 625
 626         addr = (unsigned long)address;
 627
 628         /* Check for odd addresses */
 629         if (addr & 0x1)
 630                 return false;
 631
 632         /* Check that things do not wrap around */
 633         if (addr > (addr + 2))
 634                 return false;
 635
 636         /*
 637          * Since we are in exception context, we need to do a little address checking
 638          * We need to make sure we are only accessing valid memory, and
 639          * we don't read something in the async space that can hang forever
 640          */
 641         if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
 642 #if L2_LENGTH != 0
 643             (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
 644 #endif
 645             (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||
 646 #if L1_DATA_A_LENGTH != 0
 647             (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) ||
 648 #endif
 649 #if L1_DATA_B_LENGTH != 0
 650             (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) ||
 651 #endif
 652             (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) ||
 653             (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) &&
 654                addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) ||
 655             (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) &&
 656                addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) ||
 657             (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) &&
 658                addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) ||
 659             (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) &&
 660               addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) {
 661                 *val = *address;
 662                 return true;
 663         }
 664
 665 #if L1_CODE_LENGTH != 0
 666         if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) {
 667                 isram_memcpy(val, address, 2);
 668                 return true;
 669         }
 670 #endif
 671
 672
 673         return false;
 674 }
 675
 676 /*
 677  * decode the instruction if we are printing out the trace, as it
 678  * makes things easier to follow, without running it through objdump
 679  * These are the normal instructions which cause change of flow, which
 680  * would be at the source of the trace buffer
 681  */
 682 #if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
 683 static void decode_instruction(unsigned short *address)
 684 {
 685         unsigned short opcode;
 686
 687         if (get_instruction(&opcode, address)) {
 688                 if (opcode == 0x0010)
 689                         verbose_printk("RTS");
 690                 else if (opcode == 0x0011)
 691                         verbose_printk("RTI");
 692                 else if (opcode == 0x0012)
 693                         verbose_printk("RTX");
 694                 else if (opcode == 0x0013)
 695                         verbose_printk("RTN");
 696                 else if (opcode == 0x0014)
 697                         verbose_printk("RTE");
 698                 else if (opcode == 0x0025)
 699                         verbose_printk("EMUEXCPT");
 700                 else if (opcode == 0x0040 && opcode <= 0x0047)
 701                         verbose_printk("STI R%i", opcode & 7);
 702                 else if (opcode >= 0x0050 && opcode <= 0x0057)
 703                         verbose_printk("JUMP (P%i)", opcode & 7);
 704                 else if (opcode >= 0x0060 && opcode <= 0x0067)
 705                         verbose_printk("CALL (P%i)", opcode & 7);
 706                 else if (opcode >= 0x0070 && opcode <= 0x0077)
 707                         verbose_printk("CALL (PC+P%i)", opcode & 7);
 708                 else if (opcode >= 0x0080 && opcode <= 0x0087)
 709                         verbose_printk("JUMP (PC+P%i)", opcode & 7);
 710                 else if (opcode >= 0x0090 && opcode <= 0x009F)
 711                         verbose_printk("RAISE 0x%x", opcode & 0xF);
 712                 else if (opcode >= 0x00A0 && opcode <= 0x00AF)
 713                         verbose_printk("EXCPT 0x%x", opcode & 0xF);
 714                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
 715                         verbose_printk("IF !CC JUMP");
 716                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
 717                         verbose_printk("IF CC JUMP");
 718                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
 719                         verbose_printk("JUMP.S");
 720                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
 721                         verbose_printk("LSETUP");
 722                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
 723                         verbose_printk("JUMP.L");
 724                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
 725                         verbose_printk("CALL pcrel");
 726                 else
 727                         verbose_printk("0x%04x", opcode);
 728         }
 729
 730 }
 731 #endif
 732
 733 void dump_bfin_trace_buffer(void)
 734 {
 735 #ifdef CONFIG_DEBUG_VERBOSE
 736 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 737         int tflags, i = 0;
 738         char buf[150];
 739         unsigned short *addr;
 740 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 741         int j, index;
 742 #endif
 743
 744         trace_buffer_save(tflags);
 745
 746         printk(KERN_NOTICE "Hardware Trace:\n");
 747
 748 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 749         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
 750 #endif
 751
 752         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 753                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 754                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 755                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 756                         addr = (unsigned short *)bfin_read_TBUF();
 757                         decode_address(buf, (unsigned long)addr);
 758                         printk(KERN_NOTICE "     Source : %s ", buf);
 759                         decode_instruction(addr);
 760                         printk("\n");
 761                 }
 762         }
 763
 764 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 765         if (trace_buff_offset)
 766                 index = trace_buff_offset / 4;
 767         else
 768                 index = EXPAND_LEN;
 769
 770         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 771         while (j) {
 772                 decode_address(buf, software_trace_buff[index]);
 773                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 774                 index -= 1;
 775                 if (index < 0 )
 776                         index = EXPAND_LEN;
 777                 decode_address(buf, software_trace_buff[index]);
 778                 printk(KERN_NOTICE "     Source : %s ", buf);
 779                 decode_instruction((unsigned short *)software_trace_buff[index]);
 780                 printk("\n");
 781                 index -= 1;
 782                 if (index < 0)
 783                         index = EXPAND_LEN;
 784                 j--;
 785                 i++;
 786         }
 787 #endif
 788
 789         trace_buffer_restore(tflags);
 790 #endif
 791 #endif
 792 }
 793 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 794
 795 /*
 796  * Checks to see if the address pointed to is either a
 797  * 16-bit CALL instruction, or a 32-bit CALL instruction
 798  */
 799 static bool is_bfin_call(unsigned short *addr)
 800 {
 801         unsigned short opcode = 0, *ins_addr;
 802         ins_addr = (unsigned short *)addr;
 803
 804         if (!get_instruction(&opcode, ins_addr))
 805                 return false;
 806
 807         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
 808             (opcode >= 0x0070 && opcode <= 0x0077))
 809                 return true;
 810
 811         ins_addr--;
 812         if (!get_instruction(&opcode, ins_addr))
 813                 return false;
 814
 815         if (opcode >= 0xE300 && opcode <= 0xE3FF)
 816                 return true;
 817
 818         return false;
 819
 820 }
 821
 822 void show_stack(struct task_struct *task, unsigned long *stack)
 823 {
 824 #ifdef CONFIG_PRINTK
 825         unsigned int *addr, *endstack, *fp = 0, *frame;
 826         unsigned short *ins_addr;
 827         char buf[150];
 828         unsigned int i, j, ret_addr, frame_no = 0;
 829
 830         /*
 831          * If we have been passed a specific stack, use that one otherwise
 832          *    if we have been passed a task structure, use that, otherwise
 833          *    use the stack of where the variable "stack" exists
 834          */
 835
 836         if (stack == NULL) {
 837                 if (task) {
 838                         /* We know this is a kernel stack, so this is the start/end */
 839                         stack = (unsigned long *)task->thread.ksp;
 840                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
 841                 } else {
 842                         /* print out the existing stack info */
 843                         stack = (unsigned long *)&stack;
 844                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 845                 }
 846         } else
 847                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 848
 849         printk(KERN_NOTICE "Stack info:\n");
 850         decode_address(buf, (unsigned int)stack);
 851         printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
 852
 853         if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
 854                 printk(KERN_NOTICE "Invalid stack pointer\n");
 855                 return;
 856         }
 857
 858         /* First thing is to look for a frame pointer */
 859         for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
 860                 if (*addr & 0x1)
 861                         continue;
 862                 ins_addr = (unsigned short *)*addr;
 863                 ins_addr--;
 864                 if (is_bfin_call(ins_addr))
 865                         fp = addr - 1;
 866
 867                 if (fp) {
 868                         /* Let's check to see if it is a frame pointer */
 869                         while (fp >= (addr - 1) && fp < endstack
 870                                && fp && ((unsigned int) fp & 0x3) == 0)
 871                                 fp = (unsigned int *)*fp;
 872                         if (fp == 0 || fp == endstack) {
 873                                 fp = addr - 1;
 874                                 break;
 875                         }
 876                         fp = 0;
 877                 }
 878         }
 879         if (fp) {
 880                 frame = fp;
 881                 printk(KERN_NOTICE " FP: (0x%p)\n", fp);
 882         } else
 883                 frame = 0;
 884
 885         /*
 886          * Now that we think we know where things are, we
 887          * walk the stack again, this time printing things out
 888          * incase there is no frame pointer, we still look for
 889          * valid return addresses
 890          */
 891
 892         /* First time print out data, next time, print out symbols */
 893         for (j = 0; j <= 1; j++) {
 894                 if (j)
 895                         printk(KERN_NOTICE "Return addresses in stack:\n");
 896                 else
 897                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
 898
 899                 fp = frame;
 900                 frame_no = 0;
 901
 902                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 903                      addr <= endstack; addr++, i++) {
 904
 905                         ret_addr = 0;
 906                         if (!j && i % 8 == 0)
 907                                 printk("\n" KERN_NOTICE "%p:",addr);
 908
 909                         /* if it is an odd address, or zero, just skip it */
 910                         if (*addr & 0x1 || !*addr)
 911                                 goto print;
 912
 913                         ins_addr = (unsigned short *)*addr;
 914
 915                         /* Go back one instruction, and see if it is a CALL */
 916                         ins_addr--;
 917                         ret_addr = is_bfin_call(ins_addr);
 918  print:
 919                         if (!j && stack == (unsigned long *)addr)
 920                                 printk("[%08x]", *addr);
 921                         else if (ret_addr)
 922                                 if (j) {
 923                                         decode_address(buf, (unsigned int)*addr);
 924                                         if (frame == addr) {
 925                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
 926                                                 continue;
 927                                         }
 928                                         printk(KERN_NOTICE "    address : %s\n", buf);
 929                                 } else
 930                                         printk("<%08x>", *addr);
 931                         else if (fp == addr) {
 932                                 if (j)
 933                                         frame = addr+1;
 934                                 else
 935                                         printk("(%08x)", *addr);
 936
 937                                 fp = (unsigned int *)*addr;
 938                                 frame_no++;
 939
 940                         } else if (!j)
 941                                 printk(" %08x ", *addr);
 942                 }
 943                 if (!j)
 944                         printk("\n");
 945         }
 946 #endif
 947 }
 948
 949 void dump_stack(void)
 950 {
 951         unsigned long stack;
 952 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 953         int tflags;
 954 #endif
 955         trace_buffer_save(tflags);
 956         dump_bfin_trace_buffer();
 957         show_stack(current, &stack);
 958         trace_buffer_restore(tflags);
 959 }
 960 EXPORT_SYMBOL(dump_stack);
 961
 962 void dump_bfin_process(struct pt_regs *fp)
 963 {
 964 #ifdef CONFIG_DEBUG_VERBOSE
 965         /* We should be able to look at fp->ipend, but we don't push it on the
 966          * stack all the time, so do this until we fix that */
 967         unsigned int context = bfin_read_IPEND();
 968
 969         if (oops_in_progress)
 970                 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
 971
 972         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 973                 verbose_printk(KERN_NOTICE "HW Error context\n");
 974         else if (context & 0x0020)
 975                 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
 976         else if (context & 0x3FC0)
 977                 verbose_printk(KERN_NOTICE "Interrupt context\n");
 978         else if (context & 0x4000)
 979                 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
 980         else if (context & 0x8000)
 981                 verbose_printk(KERN_NOTICE "Kernel process context\n");
 982
 983         /* Because we are crashing, and pointers could be bad, we check things
 984          * pretty closely before we use them
 985          */
 986         if ((unsigned long)current >= FIXED_CODE_START &&
 987             !((unsigned long)current & 0x3) && current->pid) {
 988                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
 989                 if (current->comm >= (char *)FIXED_CODE_START)
 990                         verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
 991                                 current->comm, current->pid);
 992                 else
 993                         verbose_printk(KERN_NOTICE "COMM= invalid\n");
 994
 995                 printk(KERN_NOTICE "CPU = %d\n", current_thread_info()->cpu);
 996                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
 997                         verbose_printk(KERN_NOTICE  "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
 998                                 KERN_NOTICE " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n"
 999                                 KERN_NOTICE "\n",
1000                                 (void *)current->mm->start_code,
1001                                 (void *)current->mm->end_code,
1002                                 (void *)current->mm->start_data,
1003                                 (void *)current->mm->end_data,
1004                                 (void *)current->mm->end_data,
1005                                 (void *)current->mm->brk,
1006                                 (void *)current->mm->start_stack);
1007                 else
1008                         verbose_printk(KERN_NOTICE "invalid mm\n");
1009         } else
1010                 verbose_printk(KERN_NOTICE "\n" KERN_NOTICE
1011                      "No Valid process in current context\n");
1012 #endif
1013 }
1014
1015 void dump_bfin_mem(struct pt_regs *fp)
1016 {
1017 #ifdef CONFIG_DEBUG_VERBOSE
1018         unsigned short *addr, *erraddr, val = 0, err = 0;
1019         char sti = 0, buf[6];
1020
1021         erraddr = (void *)fp->pc;
1022
1023         verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
1024
1025         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
1026              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
1027              addr++) {
1028                 if (!((unsigned long)addr & 0xF))
1029                         verbose_printk("\n" KERN_NOTICE "0x%p: ", addr);
1030
1031                 if (!get_instruction(&val, addr)) {
1032                                 val = 0;
1033                                 sprintf(buf, "????");
1034                 } else
1035                         sprintf(buf, "%04x", val);
1036
1037                 if (addr == erraddr) {
1038                         verbose_printk("[%s]", buf);
1039                         err = val;
1040                 } else
1041                         verbose_printk(" %s ", buf);
1042
1043                 /* Do any previous instructions turn on interrupts? */
1044                 if (addr <= erraddr &&                          /* in the past */
1045                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
1046                       val == 0x017b))                           /* [SP++] = RETI */
1047                         sti = 1;
1048         }
1049
1050         verbose_printk("\n");
1051
1052         /* Hardware error interrupts can be deferred */
1053         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1054             oops_in_progress)){
1055                 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1056 #ifndef CONFIG_DEBUG_HWERR
1057                 verbose_printk(KERN_NOTICE "The remaining message may be meaningless\n"
1058                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
1059                          " better idea where it came from\n");
1060 #else
1061                 /* If we are handling only one peripheral interrupt
1062                  * and current mm and pid are valid, and the last error
1063                  * was in that user space process's text area
1064                  * print it out - because that is where the problem exists
1065                  */
1066                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1067                      (current->pid && current->mm)) {
1068                         /* And the last RETI points to the current userspace context */
1069                         if ((fp + 1)->pc >= current->mm->start_code &&
1070                             (fp + 1)->pc <= current->mm->end_code) {
1071                                 verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
1072                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1073                                 show_regs(fp + 1);
1074                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1075                         }
1076                 }
1077 #endif
1078         }
1079 #endif
1080 }
1081
1082 void show_regs(struct pt_regs *fp)
1083 {
1084 #ifdef CONFIG_DEBUG_VERBOSE
1085         char buf [150];
1086         struct irqaction *action;
1087         unsigned int i;
1088         unsigned long flags = 0;
1089         unsigned int cpu = smp_processor_id();
1090         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
1091
1092         verbose_printk(KERN_NOTICE "\n");
1093         if (CPUID != bfin_cpuid())
1094                 verbose_printk(KERN_NOTICE "Compiled for cpu family 0x%04x (Rev %d), "
1095                         "but running on:0x%04x (Rev %d)\n",
1096                         CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid());
1097
1098         verbose_printk(KERN_NOTICE "ADSP-%s-0.%d",
1099                 CPU, bfin_compiled_revid());
1100
1101         if (bfin_compiled_revid() !=  bfin_revid())
1102                 verbose_printk("(Detected 0.%d)", bfin_revid());
1103
1104         verbose_printk(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n",
1105                 get_cclk()/1000000, get_sclk()/1000000,
1106 #ifdef CONFIG_MPU
1107                 "mpu on"
1108 #else
1109                 "mpu off"
1110 #endif
1111                 );
1112
1113         verbose_printk(KERN_NOTICE "%s", linux_banner);
1114
1115         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
1116         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
1117                 (long)fp->seqstat, fp->ipend, fp->syscfg);
1118         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1119                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1120                         (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1121 #ifdef EBIU_ERRMST
1122                 /* If the error was from the EBIU, print it out */
1123                 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1124                         verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
1125                                 bfin_read_EBIU_ERRMST());
1126                         verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
1127                                 bfin_read_EBIU_ERRADD());
1128                 }
1129 #endif
1130         }
1131         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1132                 fp->seqstat & SEQSTAT_EXCAUSE);
1133         for (i = 2; i <= 15 ; i++) {
1134                 if (fp->ipend & (1 << i)) {
1135                         if (i != 4) {
1136                                 decode_address(buf, bfin_read32(EVT0 + 4*i));
1137                                 verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1138                         } else
1139                                 verbose_printk(KERN_NOTICE "  interrupts disabled\n");
1140                 }
1141         }
1142
1143         /* if no interrupts are going off, don't print this out */
1144         if (fp->ipend & ~0x3F) {
1145                 for (i = 0; i < (NR_IRQS - 1); i++) {
1146                         if (!in_atomic)
1147                                 spin_lock_irqsave(&irq_desc[i].lock, flags);
1148
1149                         action = irq_desc[i].action;
1150                         if (!action)
1151                                 goto unlock;
1152
1153                         decode_address(buf, (unsigned int)action->handler);
1154                         verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1155                         for (action = action->next; action; action = action->next) {
1156                                 decode_address(buf, (unsigned int)action->handler);
1157                                 verbose_printk(", %s", buf);
1158                         }
1159                         verbose_printk("\n");
1160 unlock:
1161                         if (!in_atomic)
1162                                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1163                 }
1164         }
1165
1166         decode_address(buf, fp->rete);
1167         verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1168         decode_address(buf, fp->retn);
1169         verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1170         decode_address(buf, fp->retx);
1171         verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1172         decode_address(buf, fp->rets);
1173         verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1174         decode_address(buf, fp->pc);
1175         verbose_printk(KERN_NOTICE " PC  : %s\n", buf);
1176
1177         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1178             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1179                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
1180                 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1181                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
1182                 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1183         }
1184
1185         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
1186         verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1187                 fp->r0, fp->r1, fp->r2, fp->r3);
1188         verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1189                 fp->r4, fp->r5, fp->r6, fp->r7);
1190         verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1191                 fp->p0, fp->p1, fp->p2, fp->p3);
1192         verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1193                 fp->p4, fp->p5, fp->fp, (long)fp);
1194         verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1195                 fp->lb0, fp->lt0, fp->lc0);
1196         verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1197                 fp->lb1, fp->lt1, fp->lc1);
1198         verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1199                 fp->b0, fp->l0, fp->m0, fp->i0);
1200         verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1201                 fp->b1, fp->l1, fp->m1, fp->i1);
1202         verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1203                 fp->b2, fp->l2, fp->m2, fp->i2);
1204         verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1205                 fp->b3, fp->l3, fp->m3, fp->i3);
1206         verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1207                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1208
1209         verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1210                 rdusp(), fp->astat);
1211
1212         verbose_printk(KERN_NOTICE "\n");
1213 #endif
1214 }
1215
1216 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1217 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1218 #endif
1219
1220 static DEFINE_SPINLOCK(bfin_spinlock_lock);
1221
1222 asmlinkage int sys_bfin_spinlock(int *p)
1223 {
1224         int ret, tmp = 0;
1225
1226         spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
1227         ret = get_user(tmp, p);
1228         if (likely(ret == 0)) {
1229                 if (unlikely(tmp))
1230                         ret = 1;
1231                 else
1232                         put_user(1, p);
1233         }
1234         spin_unlock(&bfin_spinlock_lock);
1235         return ret;
1236 }
1237
1238 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1239 {
1240         void (*curr_handler)(void);
1241
1242         if (exception > 0x3F)
1243                 return -EINVAL;
1244
1245         curr_handler = ex_table[exception];
1246
1247         if (curr_handler != ex_replaceable)
1248                 return -EBUSY;
1249
1250         ex_table[exception] = handler;
1251
1252         return 0;
1253 }
1254 EXPORT_SYMBOL(bfin_request_exception);
1255
1256 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1257 {
1258         void (*curr_handler)(void);
1259
1260         if (exception > 0x3F)
1261                 return -EINVAL;
1262
1263         curr_handler = ex_table[exception];
1264
1265         if (curr_handler != handler)
1266                 return -EBUSY;
1267
1268         ex_table[exception] = ex_replaceable;
1269
1270         return 0;
1271 }
1272 EXPORT_SYMBOL(bfin_free_exception);
1273
1274 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1275 {
1276         switch (cplb_panic) {
1277         case CPLB_NO_UNLOCKED:
1278                 printk(KERN_EMERG "All CPLBs are locked\n");
1279                 break;
1280         case CPLB_PROT_VIOL:
1281                 return;
1282         case CPLB_NO_ADDR_MATCH:
1283                 return;
1284         case CPLB_UNKNOWN_ERR:
1285                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1286                 break;
1287         }
1288
1289         oops_in_progress = 1;
1290
1291         dump_bfin_process(fp);
1292         dump_bfin_mem(fp);
1293         show_regs(fp);
1294         dump_stack();
1295         panic("Unrecoverable event");
1296 }