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   1 /*
   2  * File:         arch/blackfin/kernel/traps.c
   3  * Based on:
   4  * Author:       Hamish Macdonald
   5  *
   6  * Created:
   7  * Description:  uses S/W interrupt 15 for the system calls
   8  *
   9  * Modified:
  10  *               Copyright 2004-2006 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 #include <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() \
 152         do { \
 153                 CHK_DEBUGGER(trapnr, sig, info.si_code, fp); \
 154         } while (0)
 155 # define CHK_DEBUGGER_TRAP_MAYBE() \
 156         do { \
 157                 if (kgdb_connected) \
 158                         CHK_DEBUGGER_TRAP(); \
 159         } while (0)
 160 #else
 161 # define CHK_DEBUGGER_TRAP() do { } while (0)
 162 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
 163 #endif
 164
 165         trace_buffer_save(j);
 166
 167         /* trap_c() will be called for exceptions. During exceptions
 168          * processing, the pc value should be set with retx value.
 169          * With this change we can cleanup some code in signal.c- TODO
 170          */
 171         fp->orig_pc = fp->retx;
 172         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 173                 trapnr, fp->ipend, fp->pc, fp->retx); */
 174
 175         /* send the appropriate signal to the user program */
 176         switch (trapnr) {
 177
 178         /* This table works in conjuction with the one in ./mach-common/entry.S
 179          * Some exceptions are handled there (in assembly, in exception space)
 180          * Some are handled here, (in C, in interrupt space)
 181          * Some, like CPLB, are handled in both, where the normal path is
 182          * handled in assembly/exception space, and the error path is handled
 183          * here
 184          */
 185
 186         /* 0x00 - Linux Syscall, getting here is an error */
 187         /* 0x01 - userspace gdb breakpoint, handled here */
 188         case VEC_EXCPT01:
 189                 info.si_code = TRAP_ILLTRAP;
 190                 sig = SIGTRAP;
 191                 CHK_DEBUGGER_TRAP_MAYBE();
 192                 /* Check if this is a breakpoint in kernel space */
 193                 if (fp->ipend & 0xffc0)
 194                         return;
 195                 else
 196                         break;
 197 #ifdef CONFIG_KGDB
 198         case VEC_EXCPT02 :               /* gdb connection */
 199                 info.si_code = TRAP_ILLTRAP;
 200                 sig = SIGTRAP;
 201                 CHK_DEBUGGER_TRAP();
 202                 return;
 203 #else
 204         /* 0x02 - User Defined, Caught by default */
 205 #endif
 206         /* 0x03  - Atomic test and set */
 207         case VEC_EXCPT03:
 208                 info.si_code = SEGV_STACKFLOW;
 209                 sig = SIGSEGV;
 210                 printk(KERN_EMERG EXC_0x03);
 211                 CHK_DEBUGGER_TRAP();
 212                 break;
 213         /* 0x04 - spinlock - handled by _ex_spinlock,
 214                 getting here is an error */
 215         /* 0x05 - User Defined, Caught by default */
 216         /* 0x06 - User Defined, Caught by default */
 217         /* 0x07 - User Defined, Caught by default */
 218         /* 0x08 - User Defined, Caught by default */
 219         /* 0x09 - User Defined, Caught by default */
 220         /* 0x0A - User Defined, Caught by default */
 221         /* 0x0B - User Defined, Caught by default */
 222         /* 0x0C - User Defined, Caught by default */
 223         /* 0x0D - User Defined, Caught by default */
 224         /* 0x0E - User Defined, Caught by default */
 225         /* 0x0F - User Defined, Caught by default */
 226         /* 0x10 HW Single step, handled here */
 227         case VEC_STEP:
 228                 info.si_code = TRAP_STEP;
 229                 sig = SIGTRAP;
 230                 CHK_DEBUGGER_TRAP_MAYBE();
 231                 /* Check if this is a single step in kernel space */
 232                 if (fp->ipend & 0xffc0)
 233                         return;
 234                 else
 235                         break;
 236         /* 0x11 - Trace Buffer Full, handled here */
 237         case VEC_OVFLOW:
 238                 info.si_code = TRAP_TRACEFLOW;
 239                 sig = SIGTRAP;
 240                 printk(KERN_EMERG EXC_0x11);
 241                 CHK_DEBUGGER_TRAP();
 242                 break;
 243         /* 0x12 - Reserved, Caught by default */
 244         /* 0x13 - Reserved, Caught by default */
 245         /* 0x14 - Reserved, Caught by default */
 246         /* 0x15 - Reserved, Caught by default */
 247         /* 0x16 - Reserved, Caught by default */
 248         /* 0x17 - Reserved, Caught by default */
 249         /* 0x18 - Reserved, Caught by default */
 250         /* 0x19 - Reserved, Caught by default */
 251         /* 0x1A - Reserved, Caught by default */
 252         /* 0x1B - Reserved, Caught by default */
 253         /* 0x1C - Reserved, Caught by default */
 254         /* 0x1D - Reserved, Caught by default */
 255         /* 0x1E - Reserved, Caught by default */
 256         /* 0x1F - Reserved, Caught by default */
 257         /* 0x20 - Reserved, Caught by default */
 258         /* 0x21 - Undefined Instruction, handled here */
 259         case VEC_UNDEF_I:
 260                 info.si_code = ILL_ILLOPC;
 261                 sig = SIGILL;
 262                 printk(KERN_EMERG EXC_0x21);
 263                 CHK_DEBUGGER_TRAP();
 264                 break;
 265         /* 0x22 - Illegal Instruction Combination, handled here */
 266         case VEC_ILGAL_I:
 267                 info.si_code = ILL_ILLPARAOP;
 268                 sig = SIGILL;
 269                 printk(KERN_EMERG EXC_0x22);
 270                 CHK_DEBUGGER_TRAP();
 271                 break;
 272         /* 0x23 - Data CPLB Protection Violation,
 273                  normal case is handled in _cplb_hdr */
 274         case VEC_CPLB_VL:
 275                 info.si_code = ILL_CPLB_VI;
 276                 sig = SIGILL;
 277                 printk(KERN_EMERG EXC_0x23);
 278                 CHK_DEBUGGER_TRAP();
 279                 break;
 280         /* 0x24 - Data access misaligned, handled here */
 281         case VEC_MISALI_D:
 282                 info.si_code = BUS_ADRALN;
 283                 sig = SIGBUS;
 284                 printk(KERN_EMERG EXC_0x24);
 285                 CHK_DEBUGGER_TRAP();
 286                 break;
 287         /* 0x25 - Unrecoverable Event, handled here */
 288         case VEC_UNCOV:
 289                 info.si_code = ILL_ILLEXCPT;
 290                 sig = SIGILL;
 291                 printk(KERN_EMERG EXC_0x25);
 292                 CHK_DEBUGGER_TRAP();
 293                 break;
 294         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 295                 error case is handled here */
 296         case VEC_CPLB_M:
 297                 info.si_code = BUS_ADRALN;
 298                 sig = SIGBUS;
 299                 printk(KERN_EMERG EXC_0x26);
 300                 CHK_DEBUGGER_TRAP();
 301                 break;
 302         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 303         case VEC_CPLB_MHIT:
 304                 info.si_code = ILL_CPLB_MULHIT;
 305 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 306                 sig = SIGSEGV;
 307                 printk(KERN_EMERG "\n"
 308                         KERN_EMERG "NULL pointer access (probably)\n");
 309 #else
 310                 sig = SIGILL;
 311                 printk(KERN_EMERG EXC_0x27);
 312 #endif
 313                 CHK_DEBUGGER_TRAP();
 314                 break;
 315         /* 0x28 - Emulation Watchpoint, handled here */
 316         case VEC_WATCH:
 317                 info.si_code = TRAP_WATCHPT;
 318                 sig = SIGTRAP;
 319                 pr_debug(EXC_0x28);
 320                 CHK_DEBUGGER_TRAP_MAYBE();
 321                 /* Check if this is a watchpoint in kernel space */
 322                 if (fp->ipend & 0xffc0)
 323                         return;
 324                 else
 325                         break;
 326 #ifdef CONFIG_BF535
 327         /* 0x29 - Instruction fetch access error (535 only) */
 328         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 329                 info.si_code = BUS_OPFETCH;
 330                 sig = SIGBUS;
 331                 printk(KERN_EMERG "BF535: VEC_ISTRU_VL\n");
 332                 CHK_DEBUGGER_TRAP();
 333                 break;
 334 #else
 335         /* 0x29 - Reserved, Caught by default */
 336 #endif
 337         /* 0x2A - Instruction fetch misaligned, handled here */
 338         case VEC_MISALI_I:
 339                 info.si_code = BUS_ADRALN;
 340                 sig = SIGBUS;
 341                 printk(KERN_EMERG EXC_0x2A);
 342                 CHK_DEBUGGER_TRAP();
 343                 break;
 344         /* 0x2B - Instruction CPLB protection Violation,
 345                 handled in _cplb_hdr */
 346         case VEC_CPLB_I_VL:
 347                 info.si_code = ILL_CPLB_VI;
 348                 sig = SIGILL;
 349                 printk(KERN_EMERG EXC_0x2B);
 350                 CHK_DEBUGGER_TRAP();
 351                 break;
 352         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 353         case VEC_CPLB_I_M:
 354                 info.si_code = ILL_CPLB_MISS;
 355                 sig = SIGBUS;
 356                 printk(KERN_EMERG EXC_0x2C);
 357                 CHK_DEBUGGER_TRAP();
 358                 break;
 359         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 360         case VEC_CPLB_I_MHIT:
 361                 info.si_code = ILL_CPLB_MULHIT;
 362 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 363                 sig = SIGSEGV;
 364                 printk(KERN_EMERG "\n\nJump to address 0 - 0x0fff\n");
 365 #else
 366                 sig = SIGILL;
 367                 printk(KERN_EMERG EXC_0x2D);
 368 #endif
 369                 CHK_DEBUGGER_TRAP();
 370                 break;
 371         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 372         case VEC_ILL_RES:
 373                 info.si_code = ILL_PRVOPC;
 374                 sig = SIGILL;
 375                 printk(KERN_EMERG EXC_0x2E);
 376                 CHK_DEBUGGER_TRAP();
 377                 break;
 378         /* 0x2F - Reserved, Caught by default */
 379         /* 0x30 - Reserved, Caught by default */
 380         /* 0x31 - Reserved, Caught by default */
 381         /* 0x32 - Reserved, Caught by default */
 382         /* 0x33 - Reserved, Caught by default */
 383         /* 0x34 - Reserved, Caught by default */
 384         /* 0x35 - Reserved, Caught by default */
 385         /* 0x36 - Reserved, Caught by default */
 386         /* 0x37 - Reserved, Caught by default */
 387         /* 0x38 - Reserved, Caught by default */
 388         /* 0x39 - Reserved, Caught by default */
 389         /* 0x3A - Reserved, Caught by default */
 390         /* 0x3B - Reserved, Caught by default */
 391         /* 0x3C - Reserved, Caught by default */
 392         /* 0x3D - Reserved, Caught by default */
 393         /* 0x3E - Reserved, Caught by default */
 394         /* 0x3F - Reserved, Caught by default */
 395         default:
 396                 info.si_code = TRAP_ILLTRAP;
 397                 sig = SIGTRAP;
 398                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 399                         (fp->seqstat & SEQSTAT_EXCAUSE));
 400                 CHK_DEBUGGER_TRAP();
 401                 break;
 402         }
 403
 404         info.si_signo = sig;
 405         info.si_errno = 0;
 406         info.si_addr = (void *)fp->pc;
 407         force_sig_info(sig, &info, current);
 408         if (sig != 0 && sig != SIGTRAP) {
 409                 unsigned long stack;
 410                 dump_bfin_regs(fp, (void *)fp->retx);
 411                 dump_bfin_trace_buffer();
 412                 show_stack(current, &stack);
 413                 if (current->mm == NULL)
 414                         panic("Kernel exception");
 415         }
 416
 417         /* if the address that we are about to return to is not valid, set it
 418          * to a valid address, if we have a current application or panic
 419          */
 420         if (!(fp->pc <= physical_mem_end
 421 #if L1_CODE_LENGTH != 0
 422             || (fp->pc >= L1_CODE_START &&
 423                 fp->pc <= (L1_CODE_START + L1_CODE_LENGTH))
 424 #endif
 425         )) {
 426                 if (current->mm) {
 427                         fp->pc = current->mm->start_code;
 428                 } else {
 429                         printk(KERN_EMERG
 430                                 "I can't return to memory that doesn't exist"
 431                                 " - bad things happen\n");
 432                         panic("Help - I've fallen and can't get up\n");
 433                 }
 434         }
 435
 436         trace_buffer_restore(j);
 437         return;
 438 }
 439
 440 /* Typical exception handling routines  */
 441
 442 void dump_bfin_trace_buffer(void)
 443 {
 444         int tflags;
 445         trace_buffer_save(tflags);
 446
 447         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 448                 int i;
 449                 printk(KERN_EMERG "Hardware Trace:\n");
 450                 for (i = 0; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 451                         printk(KERN_EMERG "%2i Target : ", i);
 452                         printk_address((unsigned long)bfin_read_TBUF());
 453                         printk("\n" KERN_EMERG "   Source : ");
 454                         printk_address((unsigned long)bfin_read_TBUF());
 455                         printk("\n");
 456                 }
 457         }
 458
 459         trace_buffer_restore(tflags);
 460 }
 461 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 462
 463 static void show_trace(struct task_struct *tsk, unsigned long *sp)
 464 {
 465         unsigned long addr;
 466
 467         printk("\nCall Trace:");
 468 #ifdef CONFIG_KALLSYMS
 469         printk("\n");
 470 #endif
 471
 472         while (!kstack_end(sp)) {
 473                 addr = *sp++;
 474                 /*
 475                  * If the address is either in the text segment of the
 476                  * kernel, or in the region which contains vmalloc'ed
 477                  * memory, it *may* be the address of a calling
 478                  * routine; if so, print it so that someone tracing
 479                  * down the cause of the crash will be able to figure
 480                  * out the call path that was taken.
 481                  */
 482                 if (kernel_text_address(addr))
 483                         print_ip_sym(addr);
 484         }
 485
 486         printk("\n");
 487 }
 488
 489 void show_stack(struct task_struct *task, unsigned long *stack)
 490 {
 491         unsigned long *endstack, addr;
 492         int i;
 493
 494         /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
 495          * called externally in some places in the kernel.
 496          */
 497
 498         if (!stack) {
 499                 if (task)
 500                         stack = (unsigned long *)task->thread.ksp;
 501                 else
 502                         stack = (unsigned long *)&stack;
 503         }
 504
 505         addr = (unsigned long)stack;
 506         endstack = (unsigned long *)PAGE_ALIGN(addr);
 507
 508         printk(KERN_EMERG "Stack from %08lx:", (unsigned long)stack);
 509         for (i = 0; i < kstack_depth_to_print; i++) {
 510                 if (stack + 1 > endstack)
 511                         break;
 512                 if (i % 8 == 0)
 513                         printk("\n" KERN_EMERG "       ");
 514                 printk(" %08lx", *stack++);
 515         }
 516
 517         show_trace(task, stack);
 518 }
 519
 520 void dump_stack(void)
 521 {
 522         unsigned long stack;
 523         int tflags;
 524         trace_buffer_save(tflags);
 525         dump_bfin_trace_buffer();
 526         show_stack(current, &stack);
 527         trace_buffer_restore(tflags);
 528 }
 529
 530 EXPORT_SYMBOL(dump_stack);
 531
 532 void dump_bfin_regs(struct pt_regs *fp, void *retaddr)
 533 {
 534         if (current->pid) {
 535                 printk(KERN_EMERG "\n" KERN_EMERG "CURRENT PROCESS:\n"
 536                         KERN_EMERG "\n");
 537                 printk(KERN_EMERG "COMM=%s PID=%d\n",
 538                         current->comm, current->pid);
 539         } else {
 540                 printk
 541                     (KERN_EMERG "\n" KERN_EMERG
 542                      "No Valid pid - Either things are really messed up,"
 543                      " or you are in the kernel\n");
 544         }
 545
 546         if (current->mm) {
 547                 printk(KERN_EMERG "TEXT = 0x%p-0x%p  DATA = 0x%p-0x%p\n"
 548                        KERN_EMERG "BSS = 0x%p-0x%p   USER-STACK = 0x%p\n"
 549                        KERN_EMERG "\n",
 550                        (void*)current->mm->start_code,
 551                        (void*)current->mm->end_code,
 552                        (void*)current->mm->start_data,
 553                        (void*)current->mm->end_data,
 554                        (void*)current->mm->end_data,
 555                        (void*)current->mm->brk,
 556                        (void*)current->mm->start_stack);
 557         }
 558
 559         printk(KERN_EMERG "return address: [0x%p]; contents of:", retaddr);
 560         if (retaddr != 0 && retaddr <= (void*)physical_mem_end
 561 #if L1_CODE_LENGTH != 0
 562             /* FIXME: Copy the code out of L1 Instruction SRAM through dma
 563                memcpy.  */
 564             && !(retaddr >= (void*)L1_CODE_START
 565                  && retaddr < (void*)(L1_CODE_START + L1_CODE_LENGTH))
 566 #endif
 567         ) {
 568                 int i = ((unsigned int)retaddr & 0xFFFFFFF0) - 32;
 569                 unsigned short x = 0;
 570                 for (; i < ((unsigned int)retaddr & 0xFFFFFFF0 ) + 32 ;
 571                         i += 2) {
 572                         if ( !(i & 0xF) )
 573                                 printk(KERN_EMERG "\n" KERN_EMERG
 574                                         "0x%08x: ", i);
 575
 576                         if (get_user(x, (unsigned short *)i))
 577                                 break;
 578 #ifndef CONFIG_DEBUG_HWERR
 579                         /* If one of the last few instructions was a STI
 580                          * it is likely that the error occured awhile ago
 581                          * and we just noticed
 582                          */
 583                         if (x >= 0x0040 && x <= 0x0047 && i <= 0)
 584                                 panic("\n\nWARNING : You should reconfigure"
 585                                         " the kernel to turn on\n"
 586                                         " 'Hardware error interrupt"
 587                                         " debugging'\n"
 588                                         " The rest of this error"
 589                                         " is meanless\n");
 590 #endif
 591                         if ( i == (unsigned int)retaddr )
 592                                 printk("[%04x]", x);
 593                         else
 594                                 printk(" %04x ", x);
 595                 }
 596                 printk("\n" KERN_EMERG "\n");
 597         } else
 598                 printk(KERN_EMERG
 599                         "Cannot look at the [PC] for it is"
 600                         "in unreadable L1 SRAM - sorry\n");
 601
 602
 603         printk(KERN_EMERG
 604                 "RETE:  %08lx  RETN: %08lx  RETX: %08lx  RETS: %08lx\n",
 605                 fp->rete, fp->retn, fp->retx, fp->rets);
 606         printk(KERN_EMERG "IPEND: %04lx  SYSCFG: %04lx\n",
 607                 fp->ipend, fp->syscfg);
 608         printk(KERN_EMERG "SEQSTAT: %08lx    SP: %08lx\n",
 609                 (long)fp->seqstat, (long)fp);
 610         printk(KERN_EMERG "R0: %08lx    R1: %08lx    R2: %08lx    R3: %08lx\n",
 611                 fp->r0, fp->r1, fp->r2, fp->r3);
 612         printk(KERN_EMERG "R4: %08lx    R5: %08lx    R6: %08lx    R7: %08lx\n",
 613                 fp->r4, fp->r5, fp->r6, fp->r7);
 614         printk(KERN_EMERG "P0: %08lx    P1: %08lx    P2: %08lx    P3: %08lx\n",
 615                 fp->p0, fp->p1, fp->p2, fp->p3);
 616         printk(KERN_EMERG
 617                 "P4: %08lx    P5: %08lx    FP: %08lx\n",
 618                 fp->p4, fp->p5, fp->fp);
 619         printk(KERN_EMERG
 620                 "A0.w: %08lx    A0.x: %08lx    A1.w: %08lx    A1.x: %08lx\n",
 621                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
 622
 623         printk(KERN_EMERG "LB0: %08lx  LT0: %08lx  LC0: %08lx\n",
 624                 fp->lb0, fp->lt0, fp->lc0);
 625         printk(KERN_EMERG "LB1: %08lx  LT1: %08lx  LC1: %08lx\n",
 626                 fp->lb1, fp->lt1, fp->lc1);
 627         printk(KERN_EMERG "B0: %08lx  L0: %08lx  M0: %08lx  I0: %08lx\n",
 628                 fp->b0, fp->l0, fp->m0, fp->i0);
 629         printk(KERN_EMERG "B1: %08lx  L1: %08lx  M1: %08lx  I1: %08lx\n",
 630                 fp->b1, fp->l1, fp->m1, fp->i1);
 631         printk(KERN_EMERG "B2: %08lx  L2: %08lx  M2: %08lx  I2: %08lx\n",
 632                 fp->b2, fp->l2, fp->m2, fp->i2);
 633         printk(KERN_EMERG "B3: %08lx  L3: %08lx  M3: %08lx  I3: %08lx\n",
 634                 fp->b3, fp->l3, fp->m3, fp->i3);
 635
 636         printk(KERN_EMERG "\n" KERN_EMERG "USP: %08lx   ASTAT: %08lx\n",
 637                 rdusp(), fp->astat);
 638         if ((long)fp->seqstat & SEQSTAT_EXCAUSE) {
 639                 printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n",
 640                         (void *)bfin_read_DCPLB_FAULT_ADDR());
 641                 printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n",
 642                         (void *)bfin_read_ICPLB_FAULT_ADDR());
 643         }
 644
 645         printk("\n\n");
 646 }
 647
 648 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
 649 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
 650 #endif
 651
 652 asmlinkage int sys_bfin_spinlock(int *spinlock)
 653 {
 654         int ret = 0;
 655         int tmp = 0;
 656
 657         local_irq_disable();
 658         ret = get_user(tmp, spinlock);
 659         if (ret == 0) {
 660                 if (tmp)
 661                         ret = 1;
 662                 tmp = 1;
 663                 put_user(tmp, spinlock);
 664         }
 665         local_irq_enable();
 666         return ret;
 667 }
 668
 669 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
 670 {
 671         switch (cplb_panic) {
 672         case CPLB_NO_UNLOCKED:
 673                 printk(KERN_EMERG "All CPLBs are locked\n");
 674                 break;
 675         case CPLB_PROT_VIOL:
 676                 return;
 677         case CPLB_NO_ADDR_MATCH:
 678                 return;
 679         case CPLB_UNKNOWN_ERR:
 680                 printk(KERN_EMERG "Unknown CPLB Exception\n");
 681                 break;
 682         }
 683
 684         printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void*)bfin_read_DCPLB_FAULT_ADDR());
 685         printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void*)bfin_read_ICPLB_FAULT_ADDR());
 686         dump_bfin_regs(fp, (void *)fp->retx);
 687         dump_stack();
 688         panic("Unrecoverable event\n");
 689 }