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