arch/blackfin/kernel/traps.c

   1 /*
   2  * File:         arch/blackfin/kernel/traps.c
   3  * Based on:
   4  * Author:       Hamish Macdonald
   5  *
   6  * Created:
   7  * Description:  uses S/W interrupt 15 for the system calls
   8  *
   9  * Modified:
  10  *               Copyright 2004-2006 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 #include <linux/uaccess.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/module.h>
  33 #include <linux/kallsyms.h>
  34 #include <linux/fs.h>
  35 #include <asm/traps.h>
  36 #include <asm/cacheflush.h>
  37 #include <asm/cplb.h>
  38 #include <asm/blackfin.h>
  39 #include <asm/irq_handler.h>
  40 #include <linux/irq.h>
  41 #include <asm/trace.h>
  42 #include <asm/fixed_code.h>
  43
  44 #ifdef CONFIG_KGDB
  45 # include <linux/kgdb.h>
  46
  47 # define CHK_DEBUGGER_TRAP() \
  48         do { \
  49                 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
  50         } while (0)
  51 # define CHK_DEBUGGER_TRAP_MAYBE() \
  52         do { \
  53                 if (kgdb_connected) \
  54                         CHK_DEBUGGER_TRAP(); \
  55         } while (0)
  56 #else
  57 # define CHK_DEBUGGER_TRAP() do { } while (0)
  58 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  59 #endif
  60
  61 /* Initiate the event table handler */
  62 void __init trap_init(void)
  63 {
  64         CSYNC();
  65         bfin_write_EVT3(trap);
  66         CSYNC();
  67 }
  68
  69 /*
  70  * Used to save the RETX, SEQSTAT, I/D CPLB FAULT ADDR
  71  * values across the transition from exception to IRQ5.
  72  * We put these in L1, so they are going to be in a valid
  73  * location during exception context
  74  */
  75 __attribute__((l1_data))
  76 unsigned long saved_retx, saved_seqstat,
  77         saved_icplb_fault_addr, saved_dcplb_fault_addr;
  78
  79 static void decode_address(char *buf, unsigned long address)
  80 {
  81         struct vm_list_struct *vml;
  82         struct task_struct *p;
  83         struct mm_struct *mm;
  84         unsigned long flags, offset;
  85         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
  86
  87 #ifdef CONFIG_KALLSYMS
  88         unsigned long symsize;
  89         const char *symname;
  90         char *modname;
  91         char *delim = ":";
  92         char namebuf[128];
  93
  94         /* look up the address and see if we are in kernel space */
  95         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
  96
  97         if (symname) {
  98                 /* yeah! kernel space! */
  99                 if (!modname)
 100                         modname = delim = "";
 101                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
 102                               (void *)address, delim, modname, delim, symname,
 103                               (unsigned long)offset);
 104                 return;
 105
 106         }
 107 #endif
 108
 109         /* Problem in fixed code section? */
 110         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 111                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
 112                 return;
 113         }
 114
 115         /* Problem somewhere before the kernel start address */
 116         if (address < CONFIG_BOOT_LOAD) {
 117                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
 118                 return;
 119         }
 120
 121         /* looks like we're off in user-land, so let's walk all the
 122          * mappings of all our processes and see if we can't be a whee
 123          * bit more specific
 124          */
 125         write_lock_irqsave(&tasklist_lock, flags);
 126         for_each_process(p) {
 127                 mm = (in_atomic ? p->mm : get_task_mm(p));
 128                 if (!mm)
 129                         continue;
 130
 131                 vml = mm->context.vmlist;
 132                 while (vml) {
 133                         struct vm_area_struct *vma = vml->vma;
 134
 135                         if (address >= vma->vm_start && address < vma->vm_end) {
 136                                 char _tmpbuf[256];
 137                                 char *name = p->comm;
 138                                 struct file *file = vma->vm_file;
 139
 140                                 if (file)
 141                                         name = d_path(&file->f_path, _tmpbuf,
 142                                                       sizeof(_tmpbuf));
 143
 144                                 /* FLAT does not have its text aligned to the start of
 145                                  * the map while FDPIC ELF does ...
 146                                  */
 147
 148                                 /* before we can check flat/fdpic, we need to
 149                                  * make sure current is valid
 150                                  */
 151                                 if ((unsigned long)current >= FIXED_CODE_START &&
 152                                     !((unsigned long)current & 0x3)) {
 153                                         if (current->mm &&
 154                                             (address > current->mm->start_code) &&
 155                                             (address < current->mm->end_code))
 156                                                 offset = address - current->mm->start_code;
 157                                         else
 158                                                 offset = (address - vma->vm_start) +
 159                                                          (vma->vm_pgoff << PAGE_SHIFT);
 160
 161                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 162                                                 (void *)address, name, offset);
 163                                 } else
 164                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
 165                                                 (void *)address, name,
 166                                                 vma->vm_start, vma->vm_end);
 167
 168                                 if (!in_atomic)
 169                                         mmput(mm);
 170
 171                                 if (!strlen(buf))
 172                                         sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
 173
 174                                 goto done;
 175                         }
 176
 177                         vml = vml->next;
 178                 }
 179                 if (!in_atomic)
 180                         mmput(mm);
 181         }
 182
 183         /* we were unable to find this address anywhere */
 184         sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
 185
 186 done:
 187         write_unlock_irqrestore(&tasklist_lock, flags);
 188 }
 189
 190 asmlinkage void double_fault_c(struct pt_regs *fp)
 191 {
 192         console_verbose();
 193         oops_in_progress = 1;
 194         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 195 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 196         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 197                 char buf[150];
 198                 decode_address(buf, saved_retx);
 199                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 200                         (int)saved_seqstat & SEQSTAT_EXCAUSE, buf);
 201                 decode_address(buf, saved_dcplb_fault_addr);
 202                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 203                 decode_address(buf, saved_icplb_fault_addr);
 204                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 205
 206                 decode_address(buf, fp->retx);
 207                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n",
 208                         buf);
 209         } else
 210 #endif
 211         {
 212                 dump_bfin_process(fp);
 213                 dump_bfin_mem(fp);
 214                 show_regs(fp);
 215         }
 216         panic("Double Fault - unrecoverable event\n");
 217
 218 }
 219
 220 asmlinkage void trap_c(struct pt_regs *fp)
 221 {
 222 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 223         int j;
 224 #endif
 225         int sig = 0;
 226         siginfo_t info;
 227         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 228
 229         trace_buffer_save(j);
 230
 231         /* Important - be very careful dereferncing pointers - will lead to
 232          * double faults if the stack has become corrupt
 233          */
 234
 235         /* If the fault was caused by a kernel thread, or interrupt handler
 236          * we will kernel panic, so the system reboots.
 237          * If KGDB is enabled, don't set this for kernel breakpoints
 238         */
 239
 240         /* TODO: check to see if we are in some sort of deferred HWERR
 241          * that we should be able to recover from, not kernel panic
 242          */
 243         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
 244 #ifdef CONFIG_KGDB
 245                 && (trapnr != VEC_EXCPT02)
 246 #endif
 247         ){
 248                 console_verbose();
 249                 oops_in_progress = 1;
 250         } else if (current) {
 251                 if (current->mm == NULL) {
 252                         console_verbose();
 253                         oops_in_progress = 1;
 254                 }
 255         }
 256
 257         /* trap_c() will be called for exceptions. During exceptions
 258          * processing, the pc value should be set with retx value.
 259          * With this change we can cleanup some code in signal.c- TODO
 260          */
 261         fp->orig_pc = fp->retx;
 262         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 263                 trapnr, fp->ipend, fp->pc, fp->retx); */
 264
 265         /* send the appropriate signal to the user program */
 266         switch (trapnr) {
 267
 268         /* This table works in conjuction with the one in ./mach-common/entry.S
 269          * Some exceptions are handled there (in assembly, in exception space)
 270          * Some are handled here, (in C, in interrupt space)
 271          * Some, like CPLB, are handled in both, where the normal path is
 272          * handled in assembly/exception space, and the error path is handled
 273          * here
 274          */
 275
 276         /* 0x00 - Linux Syscall, getting here is an error */
 277         /* 0x01 - userspace gdb breakpoint, handled here */
 278         case VEC_EXCPT01:
 279                 info.si_code = TRAP_ILLTRAP;
 280                 sig = SIGTRAP;
 281                 CHK_DEBUGGER_TRAP_MAYBE();
 282                 /* Check if this is a breakpoint in kernel space */
 283                 if (fp->ipend & 0xffc0)
 284                         return;
 285                 else
 286                         break;
 287         /* 0x03 - User Defined, userspace stack overflow */
 288         case VEC_EXCPT03:
 289                 info.si_code = SEGV_STACKFLOW;
 290                 sig = SIGSEGV;
 291                 printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
 292                 CHK_DEBUGGER_TRAP_MAYBE();
 293                 break;
 294         /* 0x02 - KGDB initial connection and break signal trap */
 295         case VEC_EXCPT02:
 296 #ifdef CONFIG_KGDB
 297                 info.si_code = TRAP_ILLTRAP;
 298                 sig = SIGTRAP;
 299                 CHK_DEBUGGER_TRAP();
 300                 return;
 301 #endif
 302         /* 0x04 - User Defined */
 303         /* 0x05 - User Defined */
 304         /* 0x06 - User Defined */
 305         /* 0x07 - User Defined */
 306         /* 0x08 - User Defined */
 307         /* 0x09 - User Defined */
 308         /* 0x0A - User Defined */
 309         /* 0x0B - User Defined */
 310         /* 0x0C - User Defined */
 311         /* 0x0D - User Defined */
 312         /* 0x0E - User Defined */
 313         /* 0x0F - User Defined */
 314         /* If we got here, it is most likely that someone was trying to use a
 315          * custom exception handler, and it is not actually installed properly
 316          */
 317         case VEC_EXCPT04 ... VEC_EXCPT15:
 318                 info.si_code = ILL_ILLPARAOP;
 319                 sig = SIGILL;
 320                 printk(KERN_NOTICE EXC_0x04(KERN_NOTICE));
 321                 CHK_DEBUGGER_TRAP_MAYBE();
 322                 break;
 323         /* 0x10 HW Single step, handled here */
 324         case VEC_STEP:
 325                 info.si_code = TRAP_STEP;
 326                 sig = SIGTRAP;
 327                 CHK_DEBUGGER_TRAP_MAYBE();
 328                 /* Check if this is a single step in kernel space */
 329                 if (fp->ipend & 0xffc0)
 330                         return;
 331                 else
 332                         break;
 333         /* 0x11 - Trace Buffer Full, handled here */
 334         case VEC_OVFLOW:
 335                 info.si_code = TRAP_TRACEFLOW;
 336                 sig = SIGTRAP;
 337                 printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
 338                 CHK_DEBUGGER_TRAP_MAYBE();
 339                 break;
 340         /* 0x12 - Reserved, Caught by default */
 341         /* 0x13 - Reserved, Caught by default */
 342         /* 0x14 - Reserved, Caught by default */
 343         /* 0x15 - Reserved, Caught by default */
 344         /* 0x16 - Reserved, Caught by default */
 345         /* 0x17 - Reserved, Caught by default */
 346         /* 0x18 - Reserved, Caught by default */
 347         /* 0x19 - Reserved, Caught by default */
 348         /* 0x1A - Reserved, Caught by default */
 349         /* 0x1B - Reserved, Caught by default */
 350         /* 0x1C - Reserved, Caught by default */
 351         /* 0x1D - Reserved, Caught by default */
 352         /* 0x1E - Reserved, Caught by default */
 353         /* 0x1F - Reserved, Caught by default */
 354         /* 0x20 - Reserved, Caught by default */
 355         /* 0x21 - Undefined Instruction, handled here */
 356         case VEC_UNDEF_I:
 357                 info.si_code = ILL_ILLOPC;
 358                 sig = SIGILL;
 359                 printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
 360                 CHK_DEBUGGER_TRAP_MAYBE();
 361                 break;
 362         /* 0x22 - Illegal Instruction Combination, handled here */
 363         case VEC_ILGAL_I:
 364                 info.si_code = ILL_ILLPARAOP;
 365                 sig = SIGILL;
 366                 printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
 367                 CHK_DEBUGGER_TRAP_MAYBE();
 368                 break;
 369         /* 0x23 - Data CPLB protection violation, handled here */
 370         case VEC_CPLB_VL:
 371                 info.si_code = ILL_CPLB_VI;
 372                 sig = SIGBUS;
 373                 printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
 374                 CHK_DEBUGGER_TRAP_MAYBE();
 375                 break;
 376         /* 0x24 - Data access misaligned, handled here */
 377         case VEC_MISALI_D:
 378                 info.si_code = BUS_ADRALN;
 379                 sig = SIGBUS;
 380                 printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
 381                 CHK_DEBUGGER_TRAP_MAYBE();
 382                 break;
 383         /* 0x25 - Unrecoverable Event, handled here */
 384         case VEC_UNCOV:
 385                 info.si_code = ILL_ILLEXCPT;
 386                 sig = SIGILL;
 387                 printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
 388                 CHK_DEBUGGER_TRAP_MAYBE();
 389                 break;
 390         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 391                 error case is handled here */
 392         case VEC_CPLB_M:
 393                 info.si_code = BUS_ADRALN;
 394                 sig = SIGBUS;
 395                 printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
 396                 break;
 397         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 398         case VEC_CPLB_MHIT:
 399                 info.si_code = ILL_CPLB_MULHIT;
 400                 sig = SIGSEGV;
 401 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 402                 if (saved_dcplb_fault_addr < FIXED_CODE_START)
 403                         printk(KERN_NOTICE "NULL pointer access\n");
 404                 else
 405 #endif
 406                         printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
 407                 CHK_DEBUGGER_TRAP_MAYBE();
 408                 break;
 409         /* 0x28 - Emulation Watchpoint, handled here */
 410         case VEC_WATCH:
 411                 info.si_code = TRAP_WATCHPT;
 412                 sig = SIGTRAP;
 413                 pr_debug(EXC_0x28(KERN_DEBUG));
 414                 CHK_DEBUGGER_TRAP_MAYBE();
 415                 /* Check if this is a watchpoint in kernel space */
 416                 if (fp->ipend & 0xffc0)
 417                         return;
 418                 else
 419                         break;
 420 #ifdef CONFIG_BF535
 421         /* 0x29 - Instruction fetch access error (535 only) */
 422         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 423                 info.si_code = BUS_OPFETCH;
 424                 sig = SIGBUS;
 425                 printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 426                 CHK_DEBUGGER_TRAP_MAYBE();
 427                 break;
 428 #else
 429         /* 0x29 - Reserved, Caught by default */
 430 #endif
 431         /* 0x2A - Instruction fetch misaligned, handled here */
 432         case VEC_MISALI_I:
 433                 info.si_code = BUS_ADRALN;
 434                 sig = SIGBUS;
 435                 printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
 436                 CHK_DEBUGGER_TRAP_MAYBE();
 437                 break;
 438         /* 0x2B - Instruction CPLB protection violation, handled here */
 439         case VEC_CPLB_I_VL:
 440                 info.si_code = ILL_CPLB_VI;
 441                 sig = SIGBUS;
 442                 printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
 443                 CHK_DEBUGGER_TRAP_MAYBE();
 444                 break;
 445         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 446         case VEC_CPLB_I_M:
 447                 info.si_code = ILL_CPLB_MISS;
 448                 sig = SIGBUS;
 449                 printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
 450                 break;
 451         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 452         case VEC_CPLB_I_MHIT:
 453                 info.si_code = ILL_CPLB_MULHIT;
 454                 sig = SIGSEGV;
 455 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 456                 if (saved_icplb_fault_addr < FIXED_CODE_START)
 457                         printk(KERN_NOTICE "Jump to NULL address\n");
 458                 else
 459 #endif
 460                         printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
 461                 CHK_DEBUGGER_TRAP_MAYBE();
 462                 break;
 463         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 464         case VEC_ILL_RES:
 465                 info.si_code = ILL_PRVOPC;
 466                 sig = SIGILL;
 467                 printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
 468                 CHK_DEBUGGER_TRAP_MAYBE();
 469                 break;
 470         /* 0x2F - Reserved, Caught by default */
 471         /* 0x30 - Reserved, Caught by default */
 472         /* 0x31 - Reserved, Caught by default */
 473         /* 0x32 - Reserved, Caught by default */
 474         /* 0x33 - Reserved, Caught by default */
 475         /* 0x34 - Reserved, Caught by default */
 476         /* 0x35 - Reserved, Caught by default */
 477         /* 0x36 - Reserved, Caught by default */
 478         /* 0x37 - Reserved, Caught by default */
 479         /* 0x38 - Reserved, Caught by default */
 480         /* 0x39 - Reserved, Caught by default */
 481         /* 0x3A - Reserved, Caught by default */
 482         /* 0x3B - Reserved, Caught by default */
 483         /* 0x3C - Reserved, Caught by default */
 484         /* 0x3D - Reserved, Caught by default */
 485         /* 0x3E - Reserved, Caught by default */
 486         /* 0x3F - Reserved, Caught by default */
 487         case VEC_HWERR:
 488                 info.si_code = BUS_ADRALN;
 489                 sig = SIGBUS;
 490                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 491                 /* System MMR Error */
 492                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 493                         info.si_code = BUS_ADRALN;
 494                         sig = SIGBUS;
 495                         printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
 496                         break;
 497                 /* External Memory Addressing Error */
 498                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 499                         info.si_code = BUS_ADRERR;
 500                         sig = SIGBUS;
 501                         printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
 502                         break;
 503                 /* Performance Monitor Overflow */
 504                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 505                         printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
 506                         break;
 507                 /* RAISE 5 instruction */
 508                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 509                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 510                         break;
 511                 default:        /* Reserved */
 512                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 513                         break;
 514                 }
 515                 CHK_DEBUGGER_TRAP_MAYBE();
 516                 break;
 517         /*
 518          * We should be handling all known exception types above,
 519          * if we get here we hit a reserved one, so panic
 520          */
 521         default:
 522                 oops_in_progress = 1;
 523                 info.si_code = ILL_ILLPARAOP;
 524                 sig = SIGILL;
 525                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 526                         (fp->seqstat & SEQSTAT_EXCAUSE));
 527                 CHK_DEBUGGER_TRAP_MAYBE();
 528                 break;
 529         }
 530
 531         BUG_ON(sig == 0);
 532
 533         if (sig != SIGTRAP) {
 534                 unsigned long *stack;
 535                 dump_bfin_process(fp);
 536                 dump_bfin_mem(fp);
 537                 show_regs(fp);
 538
 539                 /* Print out the trace buffer if it makes sense */
 540 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 541                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 542                         printk(KERN_NOTICE "No trace since you do not have "
 543                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 544                                 KERN_NOTICE "\n");
 545                 else
 546 #endif
 547                         dump_bfin_trace_buffer();
 548
 549                 if (oops_in_progress) {
 550                         /* Dump the current kernel stack */
 551                         printk(KERN_NOTICE "\n" KERN_NOTICE "Kernel Stack\n");
 552                         show_stack(current, NULL);
 553
 554                         print_modules();
 555 #ifndef CONFIG_ACCESS_CHECK
 556                         printk(KERN_EMERG "Please turn on "
 557                                "CONFIG_ACCESS_CHECK\n");
 558 #endif
 559                         panic("Kernel exception");
 560                 } else {
 561                         /* Dump the user space stack */
 562                         stack = (unsigned long *)rdusp();
 563                         printk(KERN_NOTICE "Userspace Stack\n");
 564                         show_stack(NULL, stack);
 565                 }
 566         }
 567
 568         info.si_signo = sig;
 569         info.si_errno = 0;
 570         info.si_addr = (void __user *)fp->pc;
 571         force_sig_info(sig, &info, current);
 572
 573         trace_buffer_restore(j);
 574         return;
 575 }
 576
 577 /* Typical exception handling routines  */
 578
 579 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 580
 581 /*
 582  * Similar to get_user, do some address checking, then dereference
 583  * Return true on sucess, false on bad address
 584  */
 585 bool get_instruction(unsigned short *val, unsigned short *address)
 586 {
 587
 588         unsigned long addr;
 589
 590         addr = (unsigned long)address;
 591
 592         /* Check for odd addresses */
 593         if (addr & 0x1)
 594                 return false;
 595
 596         /* Check that things do not wrap around */
 597         if (addr > (addr + 2))
 598                 return false;
 599
 600         /*
 601          * Since we are in exception context, we need to do a little address checking
 602          * We need to make sure we are only accessing valid memory, and
 603          * we don't read something in the async space that can hang forever
 604          */
 605         if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
 606 #if L2_LENGTH != 0
 607             (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
 608 #endif
 609             (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||
 610 #if L1_DATA_A_LENGTH != 0
 611             (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) ||
 612 #endif
 613 #if L1_DATA_B_LENGTH != 0
 614             (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) ||
 615 #endif
 616             (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) ||
 617             (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) &&
 618                addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) ||
 619             (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) &&
 620                addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) ||
 621             (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) &&
 622                addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) ||
 623             (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) &&
 624               addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) {
 625                 *val = *address;
 626                 return true;
 627         }
 628
 629 #if L1_CODE_LENGTH != 0
 630         if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) {
 631                 isram_memcpy(val, address, 2);
 632                 return true;
 633         }
 634 #endif
 635
 636
 637         return false;
 638 }
 639
 640 /*
 641  * decode the instruction if we are printing out the trace, as it
 642  * makes things easier to follow, without running it through objdump
 643  * These are the normal instructions which cause change of flow, which
 644  * would be at the source of the trace buffer
 645  */
 646 void decode_instruction(unsigned short *address)
 647 {
 648         unsigned short opcode;
 649
 650         if (get_instruction(&opcode, address)) {
 651                 if (opcode == 0x0010)
 652                         printk("RTS");
 653                 else if (opcode == 0x0011)
 654                         printk("RTI");
 655                 else if (opcode == 0x0012)
 656                         printk("RTX");
 657                 else if (opcode >= 0x0050 && opcode <= 0x0057)
 658                         printk("JUMP (P%i)", opcode & 7);
 659                 else if (opcode >= 0x0060 && opcode <= 0x0067)
 660                         printk("CALL (P%i)", opcode & 7);
 661                 else if (opcode >= 0x0070 && opcode <= 0x0077)
 662                         printk("CALL (PC+P%i)", opcode & 7);
 663                 else if (opcode >= 0x0080 && opcode <= 0x0087)
 664                         printk("JUMP (PC+P%i)", opcode & 7);
 665                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
 666                         printk("IF !CC JUMP");
 667                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
 668                         printk("IF CC JUMP");
 669                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
 670                         printk("JUMP.S");
 671                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
 672                         printk("LSETUP");
 673                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
 674                         printk("JUMP.L");
 675                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
 676                         printk("CALL pcrel");
 677                 else
 678                         printk("0x%04x", opcode);
 679         }
 680
 681 }
 682
 683 void dump_bfin_trace_buffer(void)
 684 {
 685 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 686         int tflags, i = 0;
 687         char buf[150];
 688         unsigned short *addr;
 689 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 690         int j, index;
 691 #endif
 692
 693         trace_buffer_save(tflags);
 694
 695         printk(KERN_NOTICE "Hardware Trace:\n");
 696
 697 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 698         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
 699 #endif
 700
 701         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 702                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 703                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 704                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 705                         addr = (unsigned short *)bfin_read_TBUF();
 706                         decode_address(buf, (unsigned long)addr);
 707                         printk(KERN_NOTICE "     Source : %s ", buf);
 708                         decode_instruction(addr);
 709                         printk("\n");
 710                 }
 711         }
 712
 713 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 714         if (trace_buff_offset)
 715                 index = trace_buff_offset / 4;
 716         else
 717                 index = EXPAND_LEN;
 718
 719         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 720         while (j) {
 721                 decode_address(buf, software_trace_buff[index]);
 722                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 723                 index -= 1;
 724                 if (index < 0 )
 725                         index = EXPAND_LEN;
 726                 decode_address(buf, software_trace_buff[index]);
 727                 printk(KERN_NOTICE "     Source : %s ", buf);
 728                 decode_instruction((unsigned short *)software_trace_buff[index]);
 729                 printk("\n");
 730                 index -= 1;
 731                 if (index < 0)
 732                         index = EXPAND_LEN;
 733                 j--;
 734                 i++;
 735         }
 736 #endif
 737
 738         trace_buffer_restore(tflags);
 739 #endif
 740 }
 741 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 742
 743 /*
 744  * Checks to see if the address pointed to is either a
 745  * 16-bit CALL instruction, or a 32-bit CALL instruction
 746  */
 747 bool is_bfin_call(unsigned short *addr)
 748 {
 749         unsigned short opcode = 0, *ins_addr;
 750         ins_addr = (unsigned short *)addr;
 751
 752         if (!get_instruction(&opcode, ins_addr))
 753                 return false;
 754
 755         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
 756             (opcode >= 0x0070 && opcode <= 0x0077))
 757                 return true;
 758
 759         ins_addr--;
 760         if (!get_instruction(&opcode, ins_addr))
 761                 return false;
 762
 763         if (opcode >= 0xE300 && opcode <= 0xE3FF)
 764                 return true;
 765
 766         return false;
 767
 768 }
 769 void show_stack(struct task_struct *task, unsigned long *stack)
 770 {
 771         unsigned int *addr, *endstack, *fp = 0, *frame;
 772         unsigned short *ins_addr;
 773         char buf[150];
 774         unsigned int i, j, ret_addr, frame_no = 0;
 775
 776         /*
 777          * If we have been passed a specific stack, use that one otherwise
 778          *    if we have been passed a task structure, use that, otherwise
 779          *    use the stack of where the variable "stack" exists
 780          */
 781
 782         if (stack == NULL) {
 783                 if (task) {
 784                         /* We know this is a kernel stack, so this is the start/end */
 785                         stack = (unsigned long *)task->thread.ksp;
 786                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
 787                 } else {
 788                         /* print out the existing stack info */
 789                         stack = (unsigned long *)&stack;
 790                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 791                 }
 792         } else
 793                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 794
 795         decode_address(buf, (unsigned int)stack);
 796         printk(KERN_NOTICE "Stack info:\n" KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
 797         addr = (unsigned int *)((unsigned int)stack & ~0x3F);
 798
 799         /* First thing is to look for a frame pointer */
 800         for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 801                 addr < endstack; addr++, i++) {
 802                 if (*addr & 0x1)
 803                         continue;
 804                 ins_addr = (unsigned short *)*addr;
 805                 ins_addr--;
 806                 if (is_bfin_call(ins_addr))
 807                         fp = addr - 1;
 808
 809                 if (fp) {
 810                         /* Let's check to see if it is a frame pointer */
 811                         while (fp >= (addr - 1) && fp < endstack && fp)
 812                                 fp = (unsigned int *)*fp;
 813                         if (fp == 0 || fp == endstack) {
 814                                 fp = addr - 1;
 815                                 break;
 816                         }
 817                         fp = 0;
 818                 }
 819         }
 820         if (fp) {
 821                 frame = fp;
 822                 printk(" FP: (0x%p)\n", fp);
 823         } else
 824                 frame = 0;
 825
 826         /*
 827          * Now that we think we know where things are, we
 828          * walk the stack again, this time printing things out
 829          * incase there is no frame pointer, we still look for
 830          * valid return addresses
 831          */
 832
 833         /* First time print out data, next time, print out symbols */
 834         for (j = 0; j <= 1; j++) {
 835                 if (j)
 836                         printk(KERN_NOTICE "Return addresses in stack:\n");
 837                 else
 838                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
 839
 840                 fp = frame;
 841                 frame_no = 0;
 842
 843                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 844                      addr <= endstack; addr++, i++) {
 845
 846                         ret_addr = 0;
 847                         if (!j && i % 8 == 0)
 848                                 printk("\n" KERN_NOTICE "%p:",addr);
 849
 850                         /* if it is an odd address, or zero, just skip it */
 851                         if (*addr & 0x1 || !*addr)
 852                                 goto print;
 853
 854                         ins_addr = (unsigned short *)*addr;
 855
 856                         /* Go back one instruction, and see if it is a CALL */
 857                         ins_addr--;
 858                         ret_addr = is_bfin_call(ins_addr);
 859  print:
 860                         if (!j && stack == (unsigned long *)addr)
 861                                 printk("[%08x]", *addr);
 862                         else if (ret_addr)
 863                                 if (j) {
 864                                         decode_address(buf, (unsigned int)*addr);
 865                                         if (frame == addr) {
 866                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
 867                                                 continue;
 868                                         }
 869                                         printk(KERN_NOTICE "    address : %s\n", buf);
 870                                 } else
 871                                         printk("<%08x>", *addr);
 872                         else if (fp == addr) {
 873                                 if (j)
 874                                         frame = addr+1;
 875                                 else
 876                                         printk("(%08x)", *addr);
 877
 878                                 fp = (unsigned int *)*addr;
 879                                 frame_no++;
 880
 881                         } else if (!j)
 882                                 printk(" %08x ", *addr);
 883                 }
 884                 if (!j)
 885                         printk("\n");
 886         }
 887
 888 }
 889
 890 void dump_stack(void)
 891 {
 892         unsigned long stack;
 893 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 894         int tflags;
 895 #endif
 896         trace_buffer_save(tflags);
 897         dump_bfin_trace_buffer();
 898         show_stack(current, &stack);
 899         trace_buffer_restore(tflags);
 900 }
 901 EXPORT_SYMBOL(dump_stack);
 902
 903 void dump_bfin_process(struct pt_regs *fp)
 904 {
 905         /* We should be able to look at fp->ipend, but we don't push it on the
 906          * stack all the time, so do this until we fix that */
 907         unsigned int context = bfin_read_IPEND();
 908
 909         if (oops_in_progress)
 910                 printk(KERN_EMERG "Kernel OOPS in progress\n");
 911
 912         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 913                 printk(KERN_NOTICE "HW Error context\n");
 914         else if (context & 0x0020)
 915                 printk(KERN_NOTICE "Deferred Exception context\n");
 916         else if (context & 0x3FC0)
 917                 printk(KERN_NOTICE "Interrupt context\n");
 918         else if (context & 0x4000)
 919                 printk(KERN_NOTICE "Deferred Interrupt context\n");
 920         else if (context & 0x8000)
 921                 printk(KERN_NOTICE "Kernel process context\n");
 922
 923         /* Because we are crashing, and pointers could be bad, we check things
 924          * pretty closely before we use them
 925          */
 926         if ((unsigned long)current >= FIXED_CODE_START &&
 927             !((unsigned long)current & 0x3) && current->pid) {
 928                 printk(KERN_NOTICE "CURRENT PROCESS:\n");
 929                 if (current->comm >= (char *)FIXED_CODE_START)
 930                         printk(KERN_NOTICE "COMM=%s PID=%d\n",
 931                                 current->comm, current->pid);
 932                 else
 933                         printk(KERN_NOTICE "COMM= invalid\n");
 934
 935                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
 936                         printk(KERN_NOTICE  "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
 937                                 KERN_NOTICE " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n"
 938                                 KERN_NOTICE "\n",
 939                                 (void *)current->mm->start_code,
 940                                 (void *)current->mm->end_code,
 941                                 (void *)current->mm->start_data,
 942                                 (void *)current->mm->end_data,
 943                                 (void *)current->mm->end_data,
 944                                 (void *)current->mm->brk,
 945                                 (void *)current->mm->start_stack);
 946                 else
 947                         printk(KERN_NOTICE "invalid mm\n");
 948         } else
 949                 printk(KERN_NOTICE "\n" KERN_NOTICE
 950                      "No Valid process in current context\n");
 951 }
 952
 953 void dump_bfin_mem(struct pt_regs *fp)
 954 {
 955         unsigned short *addr, *erraddr, val = 0, err = 0;
 956         char sti = 0, buf[6];
 957
 958         erraddr = (void *)fp->pc;
 959
 960         printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
 961
 962         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
 963              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
 964              addr++) {
 965                 if (!((unsigned long)addr & 0xF))
 966                         printk("\n" KERN_NOTICE "0x%p: ", addr);
 967
 968                 if (!get_instruction(&val, addr)) {
 969                                 val = 0;
 970                                 sprintf(buf, "????");
 971                 } else
 972                         sprintf(buf, "%04x", val);
 973
 974                 if (addr == erraddr) {
 975                         printk("[%s]", buf);
 976                         err = val;
 977                 } else
 978                         printk(" %s ", buf);
 979
 980                 /* Do any previous instructions turn on interrupts? */
 981                 if (addr <= erraddr &&                          /* in the past */
 982                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
 983                       val == 0x017b))                           /* [SP++] = RETI */
 984                         sti = 1;
 985         }
 986
 987         printk("\n");
 988
 989         /* Hardware error interrupts can be deferred */
 990         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
 991             oops_in_progress)){
 992                 printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
 993 #ifndef CONFIG_DEBUG_HWERR
 994                 printk(KERN_NOTICE "The remaining message may be meaningless\n"
 995                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
 996                          " better idea where it came from\n");
 997 #else
 998                 /* If we are handling only one peripheral interrupt
 999                  * and current mm and pid are valid, and the last error
1000                  * was in that user space process's text area
1001                  * print it out - because that is where the problem exists
1002                  */
1003                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1004                      (current->pid && current->mm)) {
1005                         /* And the last RETI points to the current userspace context */
1006                         if ((fp + 1)->pc >= current->mm->start_code &&
1007                             (fp + 1)->pc <= current->mm->end_code) {
1008                                 printk(KERN_NOTICE "It might be better to look around here : \n");
1009                                 printk(KERN_NOTICE "-------------------------------------------\n");
1010                                 show_regs(fp + 1);
1011                                 printk(KERN_NOTICE "-------------------------------------------\n");
1012                         }
1013                 }
1014 #endif
1015         }
1016 }
1017
1018 void show_regs(struct pt_regs *fp)
1019 {
1020         char buf [150];
1021         struct irqaction *action;
1022         unsigned int i;
1023         unsigned long flags;
1024
1025         printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
1026         printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
1027                 (long)fp->seqstat, fp->ipend, fp->syscfg);
1028         printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1029                 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1030         printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1031                 fp->seqstat & SEQSTAT_EXCAUSE);
1032         for (i = 6; i <= 15 ; i++) {
1033                 if (fp->ipend & (1 << i)) {
1034                         decode_address(buf, bfin_read32(EVT0 + 4*i));
1035                         printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1036                 }
1037         }
1038
1039         /* if no interrupts are going off, don't print this out */
1040         if (fp->ipend & ~0x3F) {
1041                 for (i = 0; i < (NR_IRQS - 1); i++) {
1042                         spin_lock_irqsave(&irq_desc[i].lock, flags);
1043                         action = irq_desc[i].action;
1044                         if (!action)
1045                                 goto unlock;
1046
1047                         decode_address(buf, (unsigned int)action->handler);
1048                         printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1049                         for (action = action->next; action; action = action->next) {
1050                                 decode_address(buf, (unsigned int)action->handler);
1051                                 printk(", %s", buf);
1052                         }
1053                         printk("\n");
1054 unlock:
1055                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1056                 }
1057         }
1058
1059         decode_address(buf, fp->rete);
1060         printk(KERN_NOTICE " RETE: %s\n", buf);
1061         decode_address(buf, fp->retn);
1062         printk(KERN_NOTICE " RETN: %s\n", buf);
1063         decode_address(buf, fp->retx);
1064         printk(KERN_NOTICE " RETX: %s\n", buf);
1065         decode_address(buf, fp->rets);
1066         printk(KERN_NOTICE " RETS: %s\n", buf);
1067         decode_address(buf, fp->pc);
1068         printk(KERN_NOTICE " PC  : %s\n", buf);
1069
1070         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1071             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1072                 decode_address(buf, saved_dcplb_fault_addr);
1073                 printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1074                 decode_address(buf, saved_icplb_fault_addr);
1075                 printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1076         }
1077
1078         printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
1079         printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1080                 fp->r0, fp->r1, fp->r2, fp->r3);
1081         printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1082                 fp->r4, fp->r5, fp->r6, fp->r7);
1083         printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1084                 fp->p0, fp->p1, fp->p2, fp->p3);
1085         printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1086                 fp->p4, fp->p5, fp->fp, (long)fp);
1087         printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1088                 fp->lb0, fp->lt0, fp->lc0);
1089         printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1090                 fp->lb1, fp->lt1, fp->lc1);
1091         printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1092                 fp->b0, fp->l0, fp->m0, fp->i0);
1093         printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1094                 fp->b1, fp->l1, fp->m1, fp->i1);
1095         printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1096                 fp->b2, fp->l2, fp->m2, fp->i2);
1097         printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1098                 fp->b3, fp->l3, fp->m3, fp->i3);
1099         printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1100                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1101
1102         printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1103                 rdusp(), fp->astat);
1104
1105         printk(KERN_NOTICE "\n");
1106 }
1107
1108 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1109 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1110 #endif
1111
1112 asmlinkage int sys_bfin_spinlock(int *spinlock)
1113 {
1114         int ret = 0;
1115         int tmp = 0;
1116
1117         local_irq_disable();
1118         ret = get_user(tmp, spinlock);
1119         if (ret == 0) {
1120                 if (tmp)
1121                         ret = 1;
1122                 tmp = 1;
1123                 put_user(tmp, spinlock);
1124         }
1125         local_irq_enable();
1126         return ret;
1127 }
1128
1129 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1130 {
1131         void (*curr_handler)(void);
1132
1133         if (exception > 0x3F)
1134                 return -EINVAL;
1135
1136         curr_handler = ex_table[exception];
1137
1138         if (curr_handler != ex_replaceable)
1139                 return -EBUSY;
1140
1141         ex_table[exception] = handler;
1142
1143         return 0;
1144 }
1145 EXPORT_SYMBOL(bfin_request_exception);
1146
1147 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1148 {
1149         void (*curr_handler)(void);
1150
1151         if (exception > 0x3F)
1152                 return -EINVAL;
1153
1154         curr_handler = ex_table[exception];
1155
1156         if (curr_handler != handler)
1157                 return -EBUSY;
1158
1159         ex_table[exception] = ex_replaceable;
1160
1161         return 0;
1162 }
1163 EXPORT_SYMBOL(bfin_free_exception);
1164
1165 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1166 {
1167         switch (cplb_panic) {
1168         case CPLB_NO_UNLOCKED:
1169                 printk(KERN_EMERG "All CPLBs are locked\n");
1170                 break;
1171         case CPLB_PROT_VIOL:
1172                 return;
1173         case CPLB_NO_ADDR_MATCH:
1174                 return;
1175         case CPLB_UNKNOWN_ERR:
1176                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1177                 break;
1178         }
1179
1180         oops_in_progress = 1;
1181
1182         dump_bfin_process(fp);
1183         dump_bfin_mem(fp);
1184         show_regs(fp);
1185         dump_stack();
1186         panic("Unrecoverable event\n");
1187 }