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