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 <asm/uaccess.h>
  31 #include <asm/traps.h>
  32 #include <asm/cacheflush.h>
  33 #include <asm/blackfin.h>
  34 #include <asm/uaccess.h>
  35 #include <asm/irq_handler.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/module.h>
  38 #include <linux/kallsyms.h>
  39
  40 #ifdef CONFIG_KGDB
  41 # include <linux/debugger.h>
  42 # include <linux/kgdb.h>
  43 #endif
  44
  45 /* Initiate the event table handler */
  46 void __init trap_init(void)
  47 {
  48         CSYNC();
  49         bfin_write_EVT3(trap);
  50         CSYNC();
  51 }
  52
  53 asmlinkage void trap_c(struct pt_regs *fp);
  54
  55 int kstack_depth_to_print = 48;
  56
  57 static int printk_address(unsigned long address)
  58 {
  59         struct vm_list_struct *vml;
  60         struct task_struct *p;
  61         struct mm_struct *mm;
  62         unsigned long offset;
  63
  64 #ifdef CONFIG_KALLSYMS
  65         unsigned long symsize;
  66         const char *symname;
  67         char *modname;
  68         char *delim = ":";
  69         char namebuf[128];
  70
  71         /* look up the address and see if we are in kernel space */
  72         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
  73
  74         if (symname) {
  75                 /* yeah! kernel space! */
  76                 if (!modname)
  77                         modname = delim = "";
  78                 return printk("<0x%p> { %s%s%s%s + 0x%lx }",
  79                               (void*)address, delim, modname, delim, symname,
  80                               (unsigned long)offset);
  81
  82         }
  83 #endif
  84
  85         /* looks like we're off in user-land, so let's walk all the
  86          * mappings of all our processes and see if we can't be a whee
  87          * bit more specific
  88          */
  89         write_lock_irq(&tasklist_lock);
  90         for_each_process(p) {
  91                 mm = get_task_mm(p);
  92                 if (!mm)
  93                         continue;
  94
  95                 vml = mm->context.vmlist;
  96                 while (vml) {
  97                         struct vm_area_struct *vma = vml->vma;
  98
  99                         if (address >= vma->vm_start && address < vma->vm_end) {
 100                                 char *name = p->comm;
 101                                 struct file *file = vma->vm_file;
 102                                 if (file) {
 103                                         char _tmpbuf[256];
 104                                         name = d_path(file->f_dentry,
 105                                                       file->f_vfsmnt,
 106                                                       _tmpbuf,
 107                                                       sizeof(_tmpbuf));
 108                                 }
 109
 110                                 /* FLAT does not have its text aligned to the start of
 111                                  * the map while FDPIC ELF does ...
 112                                  */
 113                                 if (current->mm &&
 114                                     (address > current->mm->start_code) &&
 115                                     (address < current->mm->end_code))
 116                                         offset = address - current->mm->start_code;
 117                                 else
 118                                         offset = (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
 119
 120                                 write_unlock_irq(&tasklist_lock);
 121                                 return printk("<0x%p> [ %s + 0x%lx ]",
 122                                               (void*)address, name, offset);
 123                         }
 124
 125                         vml = vml->next;
 126                 }
 127         }
 128         write_unlock_irq(&tasklist_lock);
 129
 130         /* we were unable to find this address anywhere */
 131         return printk("[<0x%p>]", (void*)address);
 132 }
 133
 134 #define trace_buffer_save(x) \
 135         do { \
 136                 (x) = bfin_read_TBUFCTL(); \
 137                 bfin_write_TBUFCTL((x) & ~TBUFEN); \
 138         } while (0)
 139 #define trace_buffer_restore(x) \
 140         do { \
 141                 bfin_write_TBUFCTL((x));        \
 142         } while (0)
 143
 144 asmlinkage void trap_c(struct pt_regs *fp)
 145 {
 146         int j, sig = 0;
 147         siginfo_t info;
 148         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 149
 150 #ifdef CONFIG_KGDB
 151 # define CHK_DEBUGGER_TRAP() do { CHK_DEBUGGER(trapnr, sig, info.si_code, fp,); } while (0)
 152 # define CHK_DEBUGGER_TRAP_MAYBE() do { if (kgdb_connected) CHK_DEBUGGER_TRAP(); } while (0)
 153 #else
 154 # define CHK_DEBUGGER_TRAP() do { } while (0)
 155 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
 156 #endif
 157
 158         trace_buffer_save(j);
 159
 160         /* trap_c() will be called for exceptions. During exceptions
 161          * processing, the pc value should be set with retx value.
 162          * With this change we can cleanup some code in signal.c- TODO
 163          */
 164         fp->orig_pc = fp->retx;
 165         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 166                 trapnr, fp->ipend, fp->pc, fp->retx); */
 167
 168         /* send the appropriate signal to the user program */
 169         switch (trapnr) {
 170
 171         /* This table works in conjuction with the one in ./mach-common/entry.S
 172          * Some exceptions are handled there (in assembly, in exception space)
 173          * Some are handled here, (in C, in interrupt space)
 174          * Some, like CPLB, are handled in both, where the normal path is
 175          * handled in assembly/exception space, and the error path is handled
 176          * here
 177          */
 178
 179         /* 0x00 - Linux Syscall, getting here is an error */
 180         /* 0x01 - userspace gdb breakpoint, handled here */
 181         case VEC_EXCPT01:
 182                 info.si_code = TRAP_ILLTRAP;
 183                 sig = SIGTRAP;
 184                 CHK_DEBUGGER_TRAP_MAYBE();
 185                 /* Check if this is a breakpoint in kernel space */
 186                 if (fp->ipend & 0xffc0)
 187                         return;
 188                 else
 189                         break;
 190 #ifdef CONFIG_KGDB
 191         case VEC_EXCPT02 :               /* gdb connection */
 192                 info.si_code = TRAP_ILLTRAP;
 193                 sig = SIGTRAP;
 194                 CHK_DEBUGGER_TRAP();
 195                 return;
 196 #else
 197         /* 0x02 - User Defined, Caught by default */
 198 #endif
 199         /* 0x03  - Atomic test and set */
 200         case VEC_EXCPT03:
 201                 info.si_code = SEGV_STACKFLOW;
 202                 sig = SIGSEGV;
 203                 printk(KERN_EMERG EXC_0x03);
 204                 CHK_DEBUGGER_TRAP();
 205                 break;
 206         /* 0x04 - spinlock - handled by _ex_spinlock,
 207                 getting here is an error */
 208         /* 0x05 - User Defined, Caught by default */
 209         /* 0x06 - User Defined, Caught by default */
 210         /* 0x07 - User Defined, Caught by default */
 211         /* 0x08 - User Defined, Caught by default */
 212         /* 0x09 - User Defined, Caught by default */
 213         /* 0x0A - User Defined, Caught by default */
 214         /* 0x0B - User Defined, Caught by default */
 215         /* 0x0C - User Defined, Caught by default */
 216         /* 0x0D - User Defined, Caught by default */
 217         /* 0x0E - User Defined, Caught by default */
 218         /* 0x0F - User Defined, Caught by default */
 219         /* 0x10 HW Single step, handled here */
 220         case VEC_STEP:
 221                 info.si_code = TRAP_STEP;
 222                 sig = SIGTRAP;
 223                 CHK_DEBUGGER_TRAP_MAYBE();
 224                 /* Check if this is a single step in kernel space */
 225                 if (fp->ipend & 0xffc0)
 226                         return;
 227                 else
 228                         break;
 229         /* 0x11 - Trace Buffer Full, handled here */
 230         case VEC_OVFLOW:
 231                 info.si_code = TRAP_TRACEFLOW;
 232                 sig = SIGTRAP;
 233                 printk(KERN_EMERG EXC_0x11);
 234                 CHK_DEBUGGER_TRAP();
 235                 break;
 236         /* 0x12 - Reserved, Caught by default */
 237         /* 0x13 - Reserved, Caught by default */
 238         /* 0x14 - Reserved, Caught by default */
 239         /* 0x15 - Reserved, Caught by default */
 240         /* 0x16 - Reserved, Caught by default */
 241         /* 0x17 - Reserved, Caught by default */
 242         /* 0x18 - Reserved, Caught by default */
 243         /* 0x19 - Reserved, Caught by default */
 244         /* 0x1A - Reserved, Caught by default */
 245         /* 0x1B - Reserved, Caught by default */
 246         /* 0x1C - Reserved, Caught by default */
 247         /* 0x1D - Reserved, Caught by default */
 248         /* 0x1E - Reserved, Caught by default */
 249         /* 0x1F - Reserved, Caught by default */
 250         /* 0x20 - Reserved, Caught by default */
 251         /* 0x21 - Undefined Instruction, handled here */
 252         case VEC_UNDEF_I:
 253                 info.si_code = ILL_ILLOPC;
 254                 sig = SIGILL;
 255                 printk(KERN_EMERG EXC_0x21);
 256                 CHK_DEBUGGER_TRAP();
 257                 break;
 258         /* 0x22 - Illegal Instruction Combination, handled here */
 259         case VEC_ILGAL_I:
 260                 info.si_code = ILL_ILLPARAOP;
 261                 sig = SIGILL;
 262                 printk(KERN_EMERG EXC_0x22);
 263                 CHK_DEBUGGER_TRAP();
 264                 break;
 265         /* 0x23 - Data CPLB Protection Violation,
 266                  normal case is handled in _cplb_hdr */
 267         case VEC_CPLB_VL:
 268                 info.si_code = ILL_CPLB_VI;
 269                 sig = SIGILL;
 270                 printk(KERN_EMERG EXC_0x23);
 271                 CHK_DEBUGGER_TRAP();
 272                 break;
 273         /* 0x24 - Data access misaligned, handled here */
 274         case VEC_MISALI_D:
 275                 info.si_code = BUS_ADRALN;
 276                 sig = SIGBUS;
 277                 printk(KERN_EMERG EXC_0x24);
 278                 CHK_DEBUGGER_TRAP();
 279                 break;
 280         /* 0x25 - Unrecoverable Event, handled here */
 281         case VEC_UNCOV:
 282                 info.si_code = ILL_ILLEXCPT;
 283                 sig = SIGILL;
 284                 printk(KERN_EMERG EXC_0x25);
 285                 CHK_DEBUGGER_TRAP();
 286                 break;
 287         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 288                 error case is handled here */
 289         case VEC_CPLB_M:
 290                 info.si_code = BUS_ADRALN;
 291                 sig = SIGBUS;
 292                 printk(KERN_EMERG EXC_0x26);
 293                 CHK_DEBUGGER_TRAP();
 294                 break;
 295         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 296         case VEC_CPLB_MHIT:
 297                 info.si_code = ILL_CPLB_MULHIT;
 298 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 299                 sig = SIGSEGV;
 300                 printk(KERN_EMERG "\n\nNULL pointer access (probably)\n");
 301 #else
 302                 sig = SIGILL;
 303                 printk(KERN_EMERG EXC_0x27);
 304 #endif
 305                 CHK_DEBUGGER_TRAP();
 306                 break;
 307         /* 0x28 - Emulation Watchpoint, handled here */
 308         case VEC_WATCH:
 309                 info.si_code = TRAP_WATCHPT;
 310                 sig = SIGTRAP;
 311                 pr_debug(EXC_0x28);
 312                 CHK_DEBUGGER_TRAP_MAYBE();
 313                 /* Check if this is a watchpoint in kernel space */
 314                 if (fp->ipend & 0xffc0)
 315                         return;
 316                 else
 317                         break;
 318 #ifdef CONFIG_BF535
 319         /* 0x29 - Instruction fetch access error (535 only) */
 320         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 321                 info.si_code = BUS_OPFETCH;
 322                 sig = SIGBUS;
 323                 printk(KERN_EMERG "BF535: VEC_ISTRU_VL\n");
 324                 CHK_DEBUGGER_TRAP();
 325                 break;
 326 #else
 327         /* 0x29 - Reserved, Caught by default */
 328 #endif
 329         /* 0x2A - Instruction fetch misaligned, handled here */
 330         case VEC_MISALI_I:
 331                 info.si_code = BUS_ADRALN;
 332                 sig = SIGBUS;
 333                 printk(KERN_EMERG EXC_0x2A);
 334                 CHK_DEBUGGER_TRAP();
 335                 break;
 336         /* 0x2B - Instruction CPLB protection Violation,
 337                 handled in _cplb_hdr */
 338         case VEC_CPLB_I_VL:
 339                 info.si_code = ILL_CPLB_VI;
 340                 sig = SIGILL;
 341                 printk(KERN_EMERG EXC_0x2B);
 342                 CHK_DEBUGGER_TRAP();
 343                 break;
 344         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 345         case VEC_CPLB_I_M:
 346                 info.si_code = ILL_CPLB_MISS;
 347                 sig = SIGBUS;
 348                 printk(KERN_EMERG EXC_0x2C);
 349                 CHK_DEBUGGER_TRAP();
 350                 break;
 351         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 352         case VEC_CPLB_I_MHIT:
 353                 info.si_code = ILL_CPLB_MULHIT;
 354 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 355                 sig = SIGSEGV;
 356                 printk(KERN_EMERG "\n\nJump to address 0 - 0x0fff\n");
 357 #else
 358                 sig = SIGILL;
 359                 printk(KERN_EMERG EXC_0x2D);
 360 #endif
 361                 CHK_DEBUGGER_TRAP();
 362                 break;
 363         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 364         case VEC_ILL_RES:
 365                 info.si_code = ILL_PRVOPC;
 366                 sig = SIGILL;
 367                 printk(KERN_EMERG EXC_0x2E);
 368                 CHK_DEBUGGER_TRAP();
 369                 break;
 370         /* 0x2F - Reserved, Caught by default */
 371         /* 0x30 - Reserved, Caught by default */
 372         /* 0x31 - Reserved, Caught by default */
 373         /* 0x32 - Reserved, Caught by default */
 374         /* 0x33 - Reserved, Caught by default */
 375         /* 0x34 - Reserved, Caught by default */
 376         /* 0x35 - Reserved, Caught by default */
 377         /* 0x36 - Reserved, Caught by default */
 378         /* 0x37 - Reserved, Caught by default */
 379         /* 0x38 - Reserved, Caught by default */
 380         /* 0x39 - Reserved, Caught by default */
 381         /* 0x3A - Reserved, Caught by default */
 382         /* 0x3B - Reserved, Caught by default */
 383         /* 0x3C - Reserved, Caught by default */
 384         /* 0x3D - Reserved, Caught by default */
 385         /* 0x3E - Reserved, Caught by default */
 386         /* 0x3F - Reserved, Caught by default */
 387         default:
 388                 info.si_code = TRAP_ILLTRAP;
 389                 sig = SIGTRAP;
 390                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 391                         (fp->seqstat & SEQSTAT_EXCAUSE));
 392                 CHK_DEBUGGER_TRAP();
 393                 break;
 394         }
 395
 396         info.si_signo = sig;
 397         info.si_errno = 0;
 398         info.si_addr = (void *)fp->pc;
 399         force_sig_info(sig, &info, current);
 400         if (sig != 0 && sig != SIGTRAP) {
 401                 unsigned long stack;
 402                 dump_bfin_regs(fp, (void *)fp->retx);
 403                 dump_bfin_trace_buffer();
 404                 show_stack(current, &stack);
 405                 if (current->mm == NULL)
 406                         panic("Kernel exception");
 407         }
 408
 409         /* if the address that we are about to return to is not valid, set it
 410          * to a valid address, if we have a current application or panic
 411          */
 412         if (!(fp->pc <= physical_mem_end
 413 #if L1_CODE_LENGTH != 0
 414             || (fp->pc >= L1_CODE_START &&
 415                 fp->pc <= (L1_CODE_START + L1_CODE_LENGTH))
 416 #endif
 417         )) {
 418                 if (current->mm) {
 419                         fp->pc = current->mm->start_code;
 420                 } else {
 421                         printk(KERN_EMERG "I can't return to memory that doesn't exist - bad things happen\n");
 422                         panic("Help - I've fallen and can't get up\n");
 423                 }
 424         }
 425
 426         trace_buffer_restore(j);
 427         return;
 428 }
 429
 430 /* Typical exception handling routines  */
 431
 432 void dump_bfin_trace_buffer(void)
 433 {
 434         int tflags;
 435         trace_buffer_save(tflags);
 436
 437         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 438                 int i;
 439                 printk(KERN_EMERG "Hardware Trace:\n");
 440                 for (i = 0; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 441                         printk(KERN_EMERG "%2i Target : ", i);
 442                         printk_address((unsigned long)bfin_read_TBUF());
 443                         printk("\n" KERN_EMERG "   Source : ");
 444                         printk_address((unsigned long)bfin_read_TBUF());
 445                         printk("\n");
 446                 }
 447         }
 448
 449         trace_buffer_restore(tflags);
 450 }
 451 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 452
 453 static void show_trace(struct task_struct *tsk, unsigned long *sp)
 454 {
 455         unsigned long addr;
 456
 457         printk("\nCall Trace:");
 458 #ifdef CONFIG_KALLSYMS
 459         printk("\n");
 460 #endif
 461
 462         while (!kstack_end(sp)) {
 463                 addr = *sp++;
 464                 /*
 465                  * If the address is either in the text segment of the
 466                  * kernel, or in the region which contains vmalloc'ed
 467                  * memory, it *may* be the address of a calling
 468                  * routine; if so, print it so that someone tracing
 469                  * down the cause of the crash will be able to figure
 470                  * out the call path that was taken.
 471                  */
 472                 if (kernel_text_address(addr))
 473                         print_ip_sym(addr);
 474         }
 475
 476         printk("\n");
 477 }
 478
 479 void show_stack(struct task_struct *task, unsigned long *stack)
 480 {
 481         unsigned long *endstack, addr;
 482         int i;
 483
 484         /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
 485          * called externally in some places in the kernel.
 486          */
 487
 488         if (!stack) {
 489                 if (task)
 490                         stack = (unsigned long *)task->thread.ksp;
 491                 else
 492                         stack = (unsigned long *)&stack;
 493         }
 494
 495         addr = (unsigned long)stack;
 496         endstack = (unsigned long *)PAGE_ALIGN(addr);
 497
 498         printk(KERN_EMERG "Stack from %08lx:", (unsigned long)stack);
 499         for (i = 0; i < kstack_depth_to_print; i++) {
 500                 if (stack + 1 > endstack)
 501                         break;
 502                 if (i % 8 == 0)
 503                         printk("\n" KERN_EMERG "       ");
 504                 printk(" %08lx", *stack++);
 505         }
 506
 507         show_trace(task, stack);
 508 }
 509
 510 void dump_stack(void)
 511 {
 512         unsigned long stack;
 513         int tflags;
 514         trace_buffer_save(tflags);
 515         dump_bfin_trace_buffer();
 516         show_stack(current, &stack);
 517         trace_buffer_restore(tflags);
 518 }
 519
 520 EXPORT_SYMBOL(dump_stack);
 521
 522 void dump_bfin_regs(struct pt_regs *fp, void *retaddr)
 523 {
 524         if (current->pid) {
 525                 printk("\nCURRENT PROCESS:\n\n");
 526                 printk("COMM=%s PID=%d\n", current->comm, current->pid);
 527         } else {
 528                 printk
 529                     ("\nNo Valid pid - Either things are really messed up, or you are in the kernel\n");
 530         }
 531
 532         if (current->mm) {
 533                 printk("TEXT = 0x%p-0x%p  DATA = 0x%p-0x%p\n"
 534                        "BSS = 0x%p-0x%p   USER-STACK = 0x%p\n\n",
 535                        (void*)current->mm->start_code,
 536                        (void*)current->mm->end_code,
 537                        (void*)current->mm->start_data,
 538                        (void*)current->mm->end_data,
 539                        (void*)current->mm->end_data,
 540                        (void*)current->mm->brk,
 541                        (void*)current->mm->start_stack);
 542         }
 543
 544         printk("return address: 0x%p; contents of [PC-16...PC+8]:\n", retaddr);
 545         if (retaddr != 0 && retaddr <= (void*)physical_mem_end
 546 #if L1_CODE_LENGTH != 0
 547             /* FIXME: Copy the code out of L1 Instruction SRAM through dma
 548                memcpy.  */
 549             && !(retaddr >= (void*)L1_CODE_START
 550                  && retaddr < (void*)(L1_CODE_START + L1_CODE_LENGTH))
 551 #endif
 552         ) {
 553                 int i = 0;
 554                 unsigned short x = 0;
 555                 for (i = -16; i < 8; i++) {
 556                         if (get_user(x, (unsigned short *)retaddr + i))
 557                                 break;
 558 #ifndef CONFIG_DEBUG_HWERR
 559                         /* If one of the last few instructions was a STI
 560                          * it is likely that the error occured awhile ago
 561                          * and we just noticed
 562                          */
 563                         if (x >= 0x0040 && x <= 0x0047 && i <= 0)
 564                                 panic("\n\nWARNING : You should reconfigure the kernel to turn on\n"
 565                                         " 'Hardware error interrupt debugging'\n"
 566                                         " The rest of this error is meanless\n");
 567 #endif
 568
 569                         if (i == -8)
 570                                 printk("\n");
 571                         if (i == 0)
 572                                 printk("X\n");
 573                         printk("%04x ", x);
 574                 }
 575         } else
 576                 printk("Cannot look at the [PC] for it is in unreadable L1 SRAM - sorry\n");
 577
 578         printk("\n\n");
 579
 580         printk("RETE:  %08lx  RETN: %08lx  RETX: %08lx  RETS: %08lx\n",
 581                fp->rete, fp->retn, fp->retx, fp->rets);
 582         printk("IPEND: %04lx  SYSCFG: %04lx\n", fp->ipend, fp->syscfg);
 583         printk("SEQSTAT: %08lx    SP: %08lx\n", (long)fp->seqstat, (long)fp);
 584         printk("R0: %08lx    R1: %08lx    R2: %08lx    R3: %08lx\n",
 585                fp->r0, fp->r1, fp->r2, fp->r3);
 586         printk("R4: %08lx    R5: %08lx    R6: %08lx    R7: %08lx\n",
 587                fp->r4, fp->r5, fp->r6, fp->r7);
 588         printk("P0: %08lx    P1: %08lx    P2: %08lx    P3: %08lx\n",
 589                fp->p0, fp->p1, fp->p2, fp->p3);
 590         printk("P4: %08lx    P5: %08lx    FP: %08lx\n", fp->p4, fp->p5, fp->fp);
 591         printk("A0.w: %08lx    A0.x: %08lx    A1.w: %08lx    A1.x: %08lx\n",
 592                fp->a0w, fp->a0x, fp->a1w, fp->a1x);
 593
 594         printk("LB0: %08lx  LT0: %08lx  LC0: %08lx\n", fp->lb0, fp->lt0,
 595                fp->lc0);
 596         printk("LB1: %08lx  LT1: %08lx  LC1: %08lx\n", fp->lb1, fp->lt1,
 597                fp->lc1);
 598         printk("B0: %08lx  L0: %08lx  M0: %08lx  I0: %08lx\n", fp->b0, fp->l0,
 599                fp->m0, fp->i0);
 600         printk("B1: %08lx  L1: %08lx  M1: %08lx  I1: %08lx\n", fp->b1, fp->l1,
 601                fp->m1, fp->i1);
 602         printk("B2: %08lx  L2: %08lx  M2: %08lx  I2: %08lx\n", fp->b2, fp->l2,
 603                fp->m2, fp->i2);
 604         printk("B3: %08lx  L3: %08lx  M3: %08lx  I3: %08lx\n", fp->b3, fp->l3,
 605                fp->m3, fp->i3);
 606
 607         printk("\nUSP: %08lx   ASTAT: %08lx\n", rdusp(), fp->astat);
 608         if ((long)fp->seqstat & SEQSTAT_EXCAUSE) {
 609                 printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void*)bfin_read_DCPLB_FAULT_ADDR());
 610                 printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void*)bfin_read_ICPLB_FAULT_ADDR());
 611         }
 612
 613         printk("\n\n");
 614 }
 615
 616 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
 617 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
 618 #endif
 619
 620 asmlinkage int sys_bfin_spinlock(int *spinlock)
 621 {
 622         int ret = 0;
 623         int tmp = 0;
 624
 625         local_irq_disable();
 626         ret = get_user(tmp, spinlock);
 627         if (ret == 0) {
 628                 if (tmp)
 629                         ret = 1;
 630                 tmp = 1;
 631                 put_user(tmp, spinlock);
 632         }
 633         local_irq_enable();
 634         return ret;
 635 }
 636
 637 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
 638 {
 639         switch (cplb_panic) {
 640         case CPLB_NO_UNLOCKED:
 641                 printk(KERN_EMERG "All CPLBs are locked\n");
 642                 break;
 643         case CPLB_PROT_VIOL:
 644                 return;
 645         case CPLB_NO_ADDR_MATCH:
 646                 return;
 647         case CPLB_UNKNOWN_ERR:
 648                 printk(KERN_EMERG "Unknown CPLB Exception\n");
 649                 break;
 650         }
 651
 652         printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void*)bfin_read_DCPLB_FAULT_ADDR());
 653         printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void*)bfin_read_ICPLB_FAULT_ADDR());
 654         dump_bfin_regs(fp, (void *)fp->retx);
 655         dump_stack();
 656         panic("Unrecoverable event\n");
 657 }