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