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 <linux/rbtree.h>
  36 #include <asm/traps.h>
  37 #include <asm/cacheflush.h>
  38 #include <asm/cplb.h>
  39 #include <asm/blackfin.h>
  40 #include <asm/irq_handler.h>
  41 #include <linux/irq.h>
  42 #include <asm/trace.h>
  43 #include <asm/fixed_code.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
  63 #ifdef CONFIG_DEBUG_VERBOSE
  64 #define verbose_printk(fmt, arg...) \
  65         printk(fmt, ##arg)
  66 #else
  67 #define verbose_printk(fmt, arg...) \
  68         ({ if (0) printk(fmt, ##arg); 0; })
  69 #endif
  70
  71 /* Initiate the event table handler */
  72 void __init trap_init(void)
  73 {
  74         CSYNC();
  75         bfin_write_EVT3(trap);
  76         CSYNC();
  77 }
  78
  79 static void decode_address(char *buf, unsigned long address)
  80 {
  81 #ifdef CONFIG_DEBUG_VERBOSE
  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         struct rb_node *n;
  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                 for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
 134                         struct vm_area_struct *vma;
 135
 136                         vma = rb_entry(n, struct vm_area_struct, vm_rb);
 137
 138                         if (address >= vma->vm_start && address < vma->vm_end) {
 139                                 char _tmpbuf[256];
 140                                 char *name = p->comm;
 141                                 struct file *file = vma->vm_file;
 142
 143                                 if (file) {
 144                                         char *d_name = d_path(&file->f_path, _tmpbuf,
 145                                                       sizeof(_tmpbuf));
 146                                         if (!IS_ERR(d_name))
 147                                                 name = d_name;
 148                                 }
 149
 150                                 /* FLAT does not have its text aligned to the start of
 151                                  * the map while FDPIC ELF does ...
 152                                  */
 153
 154                                 /* before we can check flat/fdpic, we need to
 155                                  * make sure current is valid
 156                                  */
 157                                 if ((unsigned long)current >= FIXED_CODE_START &&
 158                                     !((unsigned long)current & 0x3)) {
 159                                         if (current->mm &&
 160                                             (address > current->mm->start_code) &&
 161                                             (address < current->mm->end_code))
 162                                                 offset = address - current->mm->start_code;
 163                                         else
 164                                                 offset = (address - vma->vm_start) +
 165                                                          (vma->vm_pgoff << PAGE_SHIFT);
 166
 167                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 168                                                 (void *)address, name, offset);
 169                                 } else
 170                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
 171                                                 (void *)address, name,
 172                                                 vma->vm_start, vma->vm_end);
 173
 174                                 if (!in_atomic)
 175                                         mmput(mm);
 176
 177                                 if (!strlen(buf))
 178                                         sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
 179
 180                                 goto done;
 181                         }
 182                 }
 183                 if (!in_atomic)
 184                         mmput(mm);
 185         }
 186
 187         /* we were unable to find this address anywhere */
 188         sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
 189
 190 done:
 191         write_unlock_irqrestore(&tasklist_lock, flags);
 192 #else
 193         sprintf(buf, " ");
 194 #endif
 195 }
 196
 197 asmlinkage void double_fault_c(struct pt_regs *fp)
 198 {
 199         console_verbose();
 200         oops_in_progress = 1;
 201 #ifdef CONFIG_DEBUG_VERBOSE
 202         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 203 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 204         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 205                 unsigned int cpu = smp_processor_id();
 206                 char buf[150];
 207                 decode_address(buf, cpu_pda[cpu].retx);
 208                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 209                         (unsigned int)cpu_pda[cpu].seqstat & SEQSTAT_EXCAUSE, buf);
 210                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
 211                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 212                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
 213                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 214
 215                 decode_address(buf, fp->retx);
 216                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
 217         } else
 218 #endif
 219         {
 220                 dump_bfin_process(fp);
 221                 dump_bfin_mem(fp);
 222                 show_regs(fp);
 223         }
 224 #endif
 225         panic("Double Fault - unrecoverable event\n");
 226
 227 }
 228
 229 asmlinkage void trap_c(struct pt_regs *fp)
 230 {
 231 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 232         int j;
 233 #endif
 234 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 235         unsigned int cpu = smp_processor_id();
 236 #endif
 237         int sig = 0;
 238         siginfo_t info;
 239         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 240
 241         trace_buffer_save(j);
 242
 243         /* Important - be very careful dereferncing pointers - will lead to
 244          * double faults if the stack has become corrupt
 245          */
 246
 247         /* If the fault was caused by a kernel thread, or interrupt handler
 248          * we will kernel panic, so the system reboots.
 249          * If KGDB is enabled, don't set this for kernel breakpoints
 250         */
 251
 252         /* TODO: check to see if we are in some sort of deferred HWERR
 253          * that we should be able to recover from, not kernel panic
 254          */
 255         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
 256 #ifdef CONFIG_KGDB
 257                 && (trapnr != VEC_EXCPT02)
 258 #endif
 259         ){
 260                 console_verbose();
 261                 oops_in_progress = 1;
 262         } else if (current) {
 263                 if (current->mm == NULL) {
 264                         console_verbose();
 265                         oops_in_progress = 1;
 266                 }
 267         }
 268
 269         /* trap_c() will be called for exceptions. During exceptions
 270          * processing, the pc value should be set with retx value.
 271          * With this change we can cleanup some code in signal.c- TODO
 272          */
 273         fp->orig_pc = fp->retx;
 274         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 275                 trapnr, fp->ipend, fp->pc, fp->retx); */
 276
 277         /* send the appropriate signal to the user program */
 278         switch (trapnr) {
 279
 280         /* This table works in conjuction with the one in ./mach-common/entry.S
 281          * Some exceptions are handled there (in assembly, in exception space)
 282          * Some are handled here, (in C, in interrupt space)
 283          * Some, like CPLB, are handled in both, where the normal path is
 284          * handled in assembly/exception space, and the error path is handled
 285          * here
 286          */
 287
 288         /* 0x00 - Linux Syscall, getting here is an error */
 289         /* 0x01 - userspace gdb breakpoint, handled here */
 290         case VEC_EXCPT01:
 291                 info.si_code = TRAP_ILLTRAP;
 292                 sig = SIGTRAP;
 293                 CHK_DEBUGGER_TRAP_MAYBE();
 294                 /* Check if this is a breakpoint in kernel space */
 295                 if (fp->ipend & 0xffc0)
 296                         return;
 297                 else
 298                         break;
 299         /* 0x03 - User Defined, userspace stack overflow */
 300         case VEC_EXCPT03:
 301                 info.si_code = SEGV_STACKFLOW;
 302                 sig = SIGSEGV;
 303                 verbose_printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
 304                 CHK_DEBUGGER_TRAP_MAYBE();
 305                 break;
 306         /* 0x02 - KGDB initial connection and break signal trap */
 307         case VEC_EXCPT02:
 308 #ifdef CONFIG_KGDB
 309                 info.si_code = TRAP_ILLTRAP;
 310                 sig = SIGTRAP;
 311                 CHK_DEBUGGER_TRAP();
 312                 return;
 313 #endif
 314         /* 0x04 - User Defined */
 315         /* 0x05 - User Defined */
 316         /* 0x06 - User Defined */
 317         /* 0x07 - User Defined */
 318         /* 0x08 - User Defined */
 319         /* 0x09 - User Defined */
 320         /* 0x0A - User Defined */
 321         /* 0x0B - User Defined */
 322         /* 0x0C - User Defined */
 323         /* 0x0D - User Defined */
 324         /* 0x0E - User Defined */
 325         /* 0x0F - User Defined */
 326         /* If we got here, it is most likely that someone was trying to use a
 327          * custom exception handler, and it is not actually installed properly
 328          */
 329         case VEC_EXCPT04 ... VEC_EXCPT15:
 330                 info.si_code = ILL_ILLPARAOP;
 331                 sig = SIGILL;
 332                 verbose_printk(KERN_NOTICE EXC_0x04(KERN_NOTICE));
 333                 CHK_DEBUGGER_TRAP_MAYBE();
 334                 break;
 335         /* 0x10 HW Single step, handled here */
 336         case VEC_STEP:
 337                 info.si_code = TRAP_STEP;
 338                 sig = SIGTRAP;
 339                 CHK_DEBUGGER_TRAP_MAYBE();
 340                 /* Check if this is a single step in kernel space */
 341                 if (fp->ipend & 0xffc0)
 342                         return;
 343                 else
 344                         break;
 345         /* 0x11 - Trace Buffer Full, handled here */
 346         case VEC_OVFLOW:
 347                 info.si_code = TRAP_TRACEFLOW;
 348                 sig = SIGTRAP;
 349                 verbose_printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
 350                 CHK_DEBUGGER_TRAP_MAYBE();
 351                 break;
 352         /* 0x12 - Reserved, Caught by default */
 353         /* 0x13 - Reserved, Caught by default */
 354         /* 0x14 - Reserved, Caught by default */
 355         /* 0x15 - Reserved, Caught by default */
 356         /* 0x16 - Reserved, Caught by default */
 357         /* 0x17 - Reserved, Caught by default */
 358         /* 0x18 - Reserved, Caught by default */
 359         /* 0x19 - Reserved, Caught by default */
 360         /* 0x1A - Reserved, Caught by default */
 361         /* 0x1B - Reserved, Caught by default */
 362         /* 0x1C - Reserved, Caught by default */
 363         /* 0x1D - Reserved, Caught by default */
 364         /* 0x1E - Reserved, Caught by default */
 365         /* 0x1F - Reserved, Caught by default */
 366         /* 0x20 - Reserved, Caught by default */
 367         /* 0x21 - Undefined Instruction, handled here */
 368         case VEC_UNDEF_I:
 369                 info.si_code = ILL_ILLOPC;
 370                 sig = SIGILL;
 371                 verbose_printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
 372                 CHK_DEBUGGER_TRAP_MAYBE();
 373                 break;
 374         /* 0x22 - Illegal Instruction Combination, handled here */
 375         case VEC_ILGAL_I:
 376                 info.si_code = ILL_ILLPARAOP;
 377                 sig = SIGILL;
 378                 verbose_printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
 379                 CHK_DEBUGGER_TRAP_MAYBE();
 380                 break;
 381         /* 0x23 - Data CPLB protection violation, handled here */
 382         case VEC_CPLB_VL:
 383                 info.si_code = ILL_CPLB_VI;
 384                 sig = SIGBUS;
 385                 verbose_printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
 386                 CHK_DEBUGGER_TRAP_MAYBE();
 387                 break;
 388         /* 0x24 - Data access misaligned, handled here */
 389         case VEC_MISALI_D:
 390                 info.si_code = BUS_ADRALN;
 391                 sig = SIGBUS;
 392                 verbose_printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
 393                 CHK_DEBUGGER_TRAP_MAYBE();
 394                 break;
 395         /* 0x25 - Unrecoverable Event, handled here */
 396         case VEC_UNCOV:
 397                 info.si_code = ILL_ILLEXCPT;
 398                 sig = SIGILL;
 399                 verbose_printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
 400                 CHK_DEBUGGER_TRAP_MAYBE();
 401                 break;
 402         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 403                 error case is handled here */
 404         case VEC_CPLB_M:
 405                 info.si_code = BUS_ADRALN;
 406                 sig = SIGBUS;
 407                 verbose_printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
 408                 break;
 409         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 410         case VEC_CPLB_MHIT:
 411                 info.si_code = ILL_CPLB_MULHIT;
 412                 sig = SIGSEGV;
 413 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 414                 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
 415                         verbose_printk(KERN_NOTICE "NULL pointer access\n");
 416                 else
 417 #endif
 418                         verbose_printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
 419                 CHK_DEBUGGER_TRAP_MAYBE();
 420                 break;
 421         /* 0x28 - Emulation Watchpoint, handled here */
 422         case VEC_WATCH:
 423                 info.si_code = TRAP_WATCHPT;
 424                 sig = SIGTRAP;
 425                 pr_debug(EXC_0x28(KERN_DEBUG));
 426                 CHK_DEBUGGER_TRAP_MAYBE();
 427                 /* Check if this is a watchpoint in kernel space */
 428                 if (fp->ipend & 0xffc0)
 429                         return;
 430                 else
 431                         break;
 432 #ifdef CONFIG_BF535
 433         /* 0x29 - Instruction fetch access error (535 only) */
 434         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 435                 info.si_code = BUS_OPFETCH;
 436                 sig = SIGBUS;
 437                 verbose_printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 438                 CHK_DEBUGGER_TRAP_MAYBE();
 439                 break;
 440 #else
 441         /* 0x29 - Reserved, Caught by default */
 442 #endif
 443         /* 0x2A - Instruction fetch misaligned, handled here */
 444         case VEC_MISALI_I:
 445                 info.si_code = BUS_ADRALN;
 446                 sig = SIGBUS;
 447                 verbose_printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
 448                 CHK_DEBUGGER_TRAP_MAYBE();
 449                 break;
 450         /* 0x2B - Instruction CPLB protection violation, handled here */
 451         case VEC_CPLB_I_VL:
 452                 info.si_code = ILL_CPLB_VI;
 453                 sig = SIGBUS;
 454                 verbose_printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
 455                 CHK_DEBUGGER_TRAP_MAYBE();
 456                 break;
 457         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 458         case VEC_CPLB_I_M:
 459                 info.si_code = ILL_CPLB_MISS;
 460                 sig = SIGBUS;
 461                 verbose_printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
 462                 break;
 463         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 464         case VEC_CPLB_I_MHIT:
 465                 info.si_code = ILL_CPLB_MULHIT;
 466                 sig = SIGSEGV;
 467 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 468                 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
 469                         verbose_printk(KERN_NOTICE "Jump to NULL address\n");
 470                 else
 471 #endif
 472                         verbose_printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
 473                 CHK_DEBUGGER_TRAP_MAYBE();
 474                 break;
 475         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 476         case VEC_ILL_RES:
 477                 info.si_code = ILL_PRVOPC;
 478                 sig = SIGILL;
 479                 verbose_printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
 480                 CHK_DEBUGGER_TRAP_MAYBE();
 481                 break;
 482         /* 0x2F - Reserved, Caught by default */
 483         /* 0x30 - Reserved, Caught by default */
 484         /* 0x31 - Reserved, Caught by default */
 485         /* 0x32 - Reserved, Caught by default */
 486         /* 0x33 - Reserved, Caught by default */
 487         /* 0x34 - Reserved, Caught by default */
 488         /* 0x35 - Reserved, Caught by default */
 489         /* 0x36 - Reserved, Caught by default */
 490         /* 0x37 - Reserved, Caught by default */
 491         /* 0x38 - Reserved, Caught by default */
 492         /* 0x39 - Reserved, Caught by default */
 493         /* 0x3A - Reserved, Caught by default */
 494         /* 0x3B - Reserved, Caught by default */
 495         /* 0x3C - Reserved, Caught by default */
 496         /* 0x3D - Reserved, Caught by default */
 497         /* 0x3E - Reserved, Caught by default */
 498         /* 0x3F - Reserved, Caught by default */
 499         case VEC_HWERR:
 500                 info.si_code = BUS_ADRALN;
 501                 sig = SIGBUS;
 502                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 503                 /* System MMR Error */
 504                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 505                         info.si_code = BUS_ADRALN;
 506                         sig = SIGBUS;
 507                         verbose_printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
 508                         break;
 509                 /* External Memory Addressing Error */
 510                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 511                         info.si_code = BUS_ADRERR;
 512                         sig = SIGBUS;
 513                         verbose_printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
 514                         break;
 515                 /* Performance Monitor Overflow */
 516                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 517                         verbose_printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
 518                         break;
 519                 /* RAISE 5 instruction */
 520                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 521                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 522                         break;
 523                 default:        /* Reserved */
 524                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 525                         break;
 526                 }
 527                 CHK_DEBUGGER_TRAP_MAYBE();
 528                 break;
 529         /*
 530          * We should be handling all known exception types above,
 531          * if we get here we hit a reserved one, so panic
 532          */
 533         default:
 534                 oops_in_progress = 1;
 535                 info.si_code = ILL_ILLPARAOP;
 536                 sig = SIGILL;
 537                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 538                         (fp->seqstat & SEQSTAT_EXCAUSE));
 539                 CHK_DEBUGGER_TRAP_MAYBE();
 540                 break;
 541         }
 542
 543         BUG_ON(sig == 0);
 544
 545         if (sig != SIGTRAP) {
 546                 dump_bfin_process(fp);
 547                 dump_bfin_mem(fp);
 548                 show_regs(fp);
 549
 550                 /* Print out the trace buffer if it makes sense */
 551 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 552                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 553                         verbose_printk(KERN_NOTICE "No trace since you do not have "
 554                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 555                                 KERN_NOTICE "\n");
 556                 else
 557 #endif
 558                         dump_bfin_trace_buffer();
 559
 560                 if (oops_in_progress) {
 561                         /* Dump the current kernel stack */
 562                         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "Kernel Stack\n");
 563                         show_stack(current, NULL);
 564                         print_modules();
 565 #ifndef CONFIG_ACCESS_CHECK
 566                         verbose_printk(KERN_EMERG "Please turn on "
 567                                "CONFIG_ACCESS_CHECK\n");
 568 #endif
 569                         panic("Kernel exception");
 570                 } else {
 571 #ifdef CONFIG_DEBUG_VERBOSE
 572                         unsigned long *stack;
 573                         /* Dump the user space stack */
 574                         stack = (unsigned long *)rdusp();
 575                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
 576                         show_stack(NULL, stack);
 577 #endif
 578                 }
 579         }
 580
 581 #ifdef CONFIG_IPIPE
 582         if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
 583 #endif
 584         {
 585                 info.si_signo = sig;
 586                 info.si_errno = 0;
 587                 info.si_addr = (void __user *)fp->pc;
 588                 force_sig_info(sig, &info, current);
 589         }
 590
 591         trace_buffer_restore(j);
 592         return;
 593 }
 594
 595 /* Typical exception handling routines  */
 596
 597 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 598
 599 /*
 600  * Similar to get_user, do some address checking, then dereference
 601  * Return true on sucess, false on bad address
 602  */
 603 static bool get_instruction(unsigned short *val, unsigned short *address)
 604 {
 605
 606         unsigned long addr;
 607
 608         addr = (unsigned long)address;
 609
 610         /* Check for odd addresses */
 611         if (addr & 0x1)
 612                 return false;
 613
 614         /* Check that things do not wrap around */
 615         if (addr > (addr + 2))
 616                 return false;
 617
 618         /*
 619          * Since we are in exception context, we need to do a little address checking
 620          * We need to make sure we are only accessing valid memory, and
 621          * we don't read something in the async space that can hang forever
 622          */
 623         if ((addr >= FIXED_CODE_START && (addr + 2) <= physical_mem_end) ||
 624 #if L2_LENGTH != 0
 625             (addr >= L2_START && (addr + 2) <= (L2_START + L2_LENGTH)) ||
 626 #endif
 627             (addr >= BOOT_ROM_START && (addr + 2) <= (BOOT_ROM_START + BOOT_ROM_LENGTH)) ||
 628 #if L1_DATA_A_LENGTH != 0
 629             (addr >= L1_DATA_A_START && (addr + 2) <= (L1_DATA_A_START + L1_DATA_A_LENGTH)) ||
 630 #endif
 631 #if L1_DATA_B_LENGTH != 0
 632             (addr >= L1_DATA_B_START && (addr + 2) <= (L1_DATA_B_START + L1_DATA_B_LENGTH)) ||
 633 #endif
 634             (addr >= L1_SCRATCH_START && (addr + 2) <= (L1_SCRATCH_START + L1_SCRATCH_LENGTH)) ||
 635             (!(bfin_read_EBIU_AMBCTL0() & B0RDYEN) &&
 636                addr >= ASYNC_BANK0_BASE && (addr + 2) <= (ASYNC_BANK0_BASE + ASYNC_BANK0_SIZE)) ||
 637             (!(bfin_read_EBIU_AMBCTL0() & B1RDYEN) &&
 638                addr >= ASYNC_BANK1_BASE && (addr + 2) <= (ASYNC_BANK1_BASE + ASYNC_BANK1_SIZE)) ||
 639             (!(bfin_read_EBIU_AMBCTL1() & B2RDYEN) &&
 640                addr >= ASYNC_BANK2_BASE && (addr + 2) <= (ASYNC_BANK2_BASE + ASYNC_BANK1_SIZE)) ||
 641             (!(bfin_read_EBIU_AMBCTL1() & B3RDYEN) &&
 642               addr >= ASYNC_BANK3_BASE && (addr + 2) <= (ASYNC_BANK3_BASE + ASYNC_BANK1_SIZE))) {
 643                 *val = *address;
 644                 return true;
 645         }
 646
 647 #if L1_CODE_LENGTH != 0
 648         if (addr >= L1_CODE_START && (addr + 2) <= (L1_CODE_START + L1_CODE_LENGTH)) {
 649                 isram_memcpy(val, address, 2);
 650                 return true;
 651         }
 652 #endif
 653
 654
 655         return false;
 656 }
 657
 658 /*
 659  * decode the instruction if we are printing out the trace, as it
 660  * makes things easier to follow, without running it through objdump
 661  * These are the normal instructions which cause change of flow, which
 662  * would be at the source of the trace buffer
 663  */
 664 #if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
 665 static void decode_instruction(unsigned short *address)
 666 {
 667         unsigned short opcode;
 668
 669         if (get_instruction(&opcode, address)) {
 670                 if (opcode == 0x0010)
 671                         verbose_printk("RTS");
 672                 else if (opcode == 0x0011)
 673                         verbose_printk("RTI");
 674                 else if (opcode == 0x0012)
 675                         verbose_printk("RTX");
 676                 else if (opcode >= 0x0050 && opcode <= 0x0057)
 677                         verbose_printk("JUMP (P%i)", opcode & 7);
 678                 else if (opcode >= 0x0060 && opcode <= 0x0067)
 679                         verbose_printk("CALL (P%i)", opcode & 7);
 680                 else if (opcode >= 0x0070 && opcode <= 0x0077)
 681                         verbose_printk("CALL (PC+P%i)", opcode & 7);
 682                 else if (opcode >= 0x0080 && opcode <= 0x0087)
 683                         verbose_printk("JUMP (PC+P%i)", opcode & 7);
 684                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
 685                         verbose_printk("IF !CC JUMP");
 686                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
 687                         verbose_printk("IF CC JUMP");
 688                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
 689                         verbose_printk("JUMP.S");
 690                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
 691                         verbose_printk("LSETUP");
 692                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
 693                         verbose_printk("JUMP.L");
 694                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
 695                         verbose_printk("CALL pcrel");
 696                 else
 697                         verbose_printk("0x%04x", opcode);
 698         }
 699
 700 }
 701 #endif
 702
 703 void dump_bfin_trace_buffer(void)
 704 {
 705 #ifdef CONFIG_DEBUG_VERBOSE
 706 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 707         int tflags, i = 0;
 708         char buf[150];
 709         unsigned short *addr;
 710 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 711         int j, index;
 712 #endif
 713
 714         trace_buffer_save(tflags);
 715
 716         printk(KERN_NOTICE "Hardware Trace:\n");
 717
 718 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 719         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
 720 #endif
 721
 722         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 723                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 724                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 725                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 726                         addr = (unsigned short *)bfin_read_TBUF();
 727                         decode_address(buf, (unsigned long)addr);
 728                         printk(KERN_NOTICE "     Source : %s ", buf);
 729                         decode_instruction(addr);
 730                         printk("\n");
 731                 }
 732         }
 733
 734 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 735         if (trace_buff_offset)
 736                 index = trace_buff_offset / 4;
 737         else
 738                 index = EXPAND_LEN;
 739
 740         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 741         while (j) {
 742                 decode_address(buf, software_trace_buff[index]);
 743                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 744                 index -= 1;
 745                 if (index < 0 )
 746                         index = EXPAND_LEN;
 747                 decode_address(buf, software_trace_buff[index]);
 748                 printk(KERN_NOTICE "     Source : %s ", buf);
 749                 decode_instruction((unsigned short *)software_trace_buff[index]);
 750                 printk("\n");
 751                 index -= 1;
 752                 if (index < 0)
 753                         index = EXPAND_LEN;
 754                 j--;
 755                 i++;
 756         }
 757 #endif
 758
 759         trace_buffer_restore(tflags);
 760 #endif
 761 #endif
 762 }
 763 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 764
 765 /*
 766  * Checks to see if the address pointed to is either a
 767  * 16-bit CALL instruction, or a 32-bit CALL instruction
 768  */
 769 static bool is_bfin_call(unsigned short *addr)
 770 {
 771         unsigned short opcode = 0, *ins_addr;
 772         ins_addr = (unsigned short *)addr;
 773
 774         if (!get_instruction(&opcode, ins_addr))
 775                 return false;
 776
 777         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
 778             (opcode >= 0x0070 && opcode <= 0x0077))
 779                 return true;
 780
 781         ins_addr--;
 782         if (!get_instruction(&opcode, ins_addr))
 783                 return false;
 784
 785         if (opcode >= 0xE300 && opcode <= 0xE3FF)
 786                 return true;
 787
 788         return false;
 789
 790 }
 791
 792 void show_stack(struct task_struct *task, unsigned long *stack)
 793 {
 794 #ifdef CONFIG_PRINTK
 795         unsigned int *addr, *endstack, *fp = 0, *frame;
 796         unsigned short *ins_addr;
 797         char buf[150];
 798         unsigned int i, j, ret_addr, frame_no = 0;
 799
 800         /*
 801          * If we have been passed a specific stack, use that one otherwise
 802          *    if we have been passed a task structure, use that, otherwise
 803          *    use the stack of where the variable "stack" exists
 804          */
 805
 806         if (stack == NULL) {
 807                 if (task) {
 808                         /* We know this is a kernel stack, so this is the start/end */
 809                         stack = (unsigned long *)task->thread.ksp;
 810                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
 811                 } else {
 812                         /* print out the existing stack info */
 813                         stack = (unsigned long *)&stack;
 814                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 815                 }
 816         } else
 817                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 818
 819         printk(KERN_NOTICE "Stack info:\n");
 820         decode_address(buf, (unsigned int)stack);
 821         printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
 822
 823         addr = (unsigned int *)((unsigned int)stack & ~0x3F);
 824
 825         /* First thing is to look for a frame pointer */
 826         for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 827                 addr < endstack; addr++, i++) {
 828                 if (*addr & 0x1)
 829                         continue;
 830                 ins_addr = (unsigned short *)*addr;
 831                 ins_addr--;
 832                 if (is_bfin_call(ins_addr))
 833                         fp = addr - 1;
 834
 835                 if (fp) {
 836                         /* Let's check to see if it is a frame pointer */
 837                         while (fp >= (addr - 1) && fp < endstack && fp)
 838                                 fp = (unsigned int *)*fp;
 839                         if (fp == 0 || fp == endstack) {
 840                                 fp = addr - 1;
 841                                 break;
 842                         }
 843                         fp = 0;
 844                 }
 845         }
 846         if (fp) {
 847                 frame = fp;
 848                 printk(KERN_NOTICE " FP: (0x%p)\n", fp);
 849         } else
 850                 frame = 0;
 851
 852         /*
 853          * Now that we think we know where things are, we
 854          * walk the stack again, this time printing things out
 855          * incase there is no frame pointer, we still look for
 856          * valid return addresses
 857          */
 858
 859         /* First time print out data, next time, print out symbols */
 860         for (j = 0; j <= 1; j++) {
 861                 if (j)
 862                         printk(KERN_NOTICE "Return addresses in stack:\n");
 863                 else
 864                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
 865
 866                 fp = frame;
 867                 frame_no = 0;
 868
 869                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 870                      addr <= endstack; addr++, i++) {
 871
 872                         ret_addr = 0;
 873                         if (!j && i % 8 == 0)
 874                                 printk("\n" KERN_NOTICE "%p:",addr);
 875
 876                         /* if it is an odd address, or zero, just skip it */
 877                         if (*addr & 0x1 || !*addr)
 878                                 goto print;
 879
 880                         ins_addr = (unsigned short *)*addr;
 881
 882                         /* Go back one instruction, and see if it is a CALL */
 883                         ins_addr--;
 884                         ret_addr = is_bfin_call(ins_addr);
 885  print:
 886                         if (!j && stack == (unsigned long *)addr)
 887                                 printk("[%08x]", *addr);
 888                         else if (ret_addr)
 889                                 if (j) {
 890                                         decode_address(buf, (unsigned int)*addr);
 891                                         if (frame == addr) {
 892                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
 893                                                 continue;
 894                                         }
 895                                         printk(KERN_NOTICE "    address : %s\n", buf);
 896                                 } else
 897                                         printk("<%08x>", *addr);
 898                         else if (fp == addr) {
 899                                 if (j)
 900                                         frame = addr+1;
 901                                 else
 902                                         printk("(%08x)", *addr);
 903
 904                                 fp = (unsigned int *)*addr;
 905                                 frame_no++;
 906
 907                         } else if (!j)
 908                                 printk(" %08x ", *addr);
 909                 }
 910                 if (!j)
 911                         printk("\n");
 912         }
 913 #endif
 914 }
 915
 916 void dump_stack(void)
 917 {
 918         unsigned long stack;
 919 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 920         int tflags;
 921 #endif
 922         trace_buffer_save(tflags);
 923         dump_bfin_trace_buffer();
 924         show_stack(current, &stack);
 925         trace_buffer_restore(tflags);
 926 }
 927 EXPORT_SYMBOL(dump_stack);
 928
 929 void dump_bfin_process(struct pt_regs *fp)
 930 {
 931 #ifdef CONFIG_DEBUG_VERBOSE
 932         /* We should be able to look at fp->ipend, but we don't push it on the
 933          * stack all the time, so do this until we fix that */
 934         unsigned int context = bfin_read_IPEND();
 935
 936         if (oops_in_progress)
 937                 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
 938
 939         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 940                 verbose_printk(KERN_NOTICE "HW Error context\n");
 941         else if (context & 0x0020)
 942                 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
 943         else if (context & 0x3FC0)
 944                 verbose_printk(KERN_NOTICE "Interrupt context\n");
 945         else if (context & 0x4000)
 946                 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
 947         else if (context & 0x8000)
 948                 verbose_printk(KERN_NOTICE "Kernel process context\n");
 949
 950         /* Because we are crashing, and pointers could be bad, we check things
 951          * pretty closely before we use them
 952          */
 953         if ((unsigned long)current >= FIXED_CODE_START &&
 954             !((unsigned long)current & 0x3) && current->pid) {
 955                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
 956                 if (current->comm >= (char *)FIXED_CODE_START)
 957                         verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
 958                                 current->comm, current->pid);
 959                 else
 960                         verbose_printk(KERN_NOTICE "COMM= invalid\n");
 961
 962                 printk(KERN_NOTICE "CPU = %d\n", current_thread_info()->cpu);
 963                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
 964                         verbose_printk(KERN_NOTICE  "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
 965                                 KERN_NOTICE " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n"
 966                                 KERN_NOTICE "\n",
 967                                 (void *)current->mm->start_code,
 968                                 (void *)current->mm->end_code,
 969                                 (void *)current->mm->start_data,
 970                                 (void *)current->mm->end_data,
 971                                 (void *)current->mm->end_data,
 972                                 (void *)current->mm->brk,
 973                                 (void *)current->mm->start_stack);
 974                 else
 975                         verbose_printk(KERN_NOTICE "invalid mm\n");
 976         } else
 977                 verbose_printk(KERN_NOTICE "\n" KERN_NOTICE
 978                      "No Valid process in current context\n");
 979 #endif
 980 }
 981
 982 void dump_bfin_mem(struct pt_regs *fp)
 983 {
 984 #ifdef CONFIG_DEBUG_VERBOSE
 985         unsigned short *addr, *erraddr, val = 0, err = 0;
 986         char sti = 0, buf[6];
 987
 988         erraddr = (void *)fp->pc;
 989
 990         verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
 991
 992         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
 993              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
 994              addr++) {
 995                 if (!((unsigned long)addr & 0xF))
 996                         verbose_printk("\n" KERN_NOTICE "0x%p: ", addr);
 997
 998                 if (!get_instruction(&val, addr)) {
 999                                 val = 0;
1000                                 sprintf(buf, "????");
1001                 } else
1002                         sprintf(buf, "%04x", val);
1003
1004                 if (addr == erraddr) {
1005                         verbose_printk("[%s]", buf);
1006                         err = val;
1007                 } else
1008                         verbose_printk(" %s ", buf);
1009
1010                 /* Do any previous instructions turn on interrupts? */
1011                 if (addr <= erraddr &&                          /* in the past */
1012                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
1013                       val == 0x017b))                           /* [SP++] = RETI */
1014                         sti = 1;
1015         }
1016
1017         verbose_printk("\n");
1018
1019         /* Hardware error interrupts can be deferred */
1020         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1021             oops_in_progress)){
1022                 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1023 #ifndef CONFIG_DEBUG_HWERR
1024                 verbose_printk(KERN_NOTICE "The remaining message may be meaningless\n"
1025                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
1026                          " better idea where it came from\n");
1027 #else
1028                 /* If we are handling only one peripheral interrupt
1029                  * and current mm and pid are valid, and the last error
1030                  * was in that user space process's text area
1031                  * print it out - because that is where the problem exists
1032                  */
1033                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1034                      (current->pid && current->mm)) {
1035                         /* And the last RETI points to the current userspace context */
1036                         if ((fp + 1)->pc >= current->mm->start_code &&
1037                             (fp + 1)->pc <= current->mm->end_code) {
1038                                 verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
1039                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1040                                 show_regs(fp + 1);
1041                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1042                         }
1043                 }
1044 #endif
1045         }
1046 #endif
1047 }
1048
1049 void show_regs(struct pt_regs *fp)
1050 {
1051 #ifdef CONFIG_DEBUG_VERBOSE
1052         char buf [150];
1053         struct irqaction *action;
1054         unsigned int i;
1055         unsigned long flags;
1056         unsigned int cpu = smp_processor_id();
1057
1058         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
1059         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
1060                 (long)fp->seqstat, fp->ipend, fp->syscfg);
1061         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1062                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1063                         (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1064 #ifdef EBIU_ERRMST
1065                 /* If the error was from the EBIU, print it out */
1066                 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1067                         verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
1068                                 bfin_read_EBIU_ERRMST());
1069                         verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
1070                                 bfin_read_EBIU_ERRADD());
1071                 }
1072 #endif
1073         }
1074         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1075                 fp->seqstat & SEQSTAT_EXCAUSE);
1076         for (i = 6; i <= 15 ; i++) {
1077                 if (fp->ipend & (1 << i)) {
1078                         decode_address(buf, bfin_read32(EVT0 + 4*i));
1079                         verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1080                 }
1081         }
1082
1083         /* if no interrupts are going off, don't print this out */
1084         if (fp->ipend & ~0x3F) {
1085                 for (i = 0; i < (NR_IRQS - 1); i++) {
1086                         spin_lock_irqsave(&irq_desc[i].lock, flags);
1087                         action = irq_desc[i].action;
1088                         if (!action)
1089                                 goto unlock;
1090
1091                         decode_address(buf, (unsigned int)action->handler);
1092                         verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1093                         for (action = action->next; action; action = action->next) {
1094                                 decode_address(buf, (unsigned int)action->handler);
1095                                 verbose_printk(", %s", buf);
1096                         }
1097                         verbose_printk("\n");
1098 unlock:
1099                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1100                 }
1101         }
1102
1103         decode_address(buf, fp->rete);
1104         verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1105         decode_address(buf, fp->retn);
1106         verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1107         decode_address(buf, fp->retx);
1108         verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1109         decode_address(buf, fp->rets);
1110         verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1111         decode_address(buf, fp->pc);
1112         verbose_printk(KERN_NOTICE " PC  : %s\n", buf);
1113
1114         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1115             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1116                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
1117                 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1118                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
1119                 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1120         }
1121
1122         verbose_printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
1123         verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1124                 fp->r0, fp->r1, fp->r2, fp->r3);
1125         verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1126                 fp->r4, fp->r5, fp->r6, fp->r7);
1127         verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1128                 fp->p0, fp->p1, fp->p2, fp->p3);
1129         verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1130                 fp->p4, fp->p5, fp->fp, (long)fp);
1131         verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1132                 fp->lb0, fp->lt0, fp->lc0);
1133         verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1134                 fp->lb1, fp->lt1, fp->lc1);
1135         verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1136                 fp->b0, fp->l0, fp->m0, fp->i0);
1137         verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1138                 fp->b1, fp->l1, fp->m1, fp->i1);
1139         verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1140                 fp->b2, fp->l2, fp->m2, fp->i2);
1141         verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1142                 fp->b3, fp->l3, fp->m3, fp->i3);
1143         verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1144                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1145
1146         verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1147                 rdusp(), fp->astat);
1148
1149         verbose_printk(KERN_NOTICE "\n");
1150 #endif
1151 }
1152
1153 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1154 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1155 #endif
1156
1157 static DEFINE_SPINLOCK(bfin_spinlock_lock);
1158
1159 asmlinkage int sys_bfin_spinlock(int *p)
1160 {
1161         int ret, tmp = 0;
1162
1163         spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
1164         ret = get_user(tmp, p);
1165         if (likely(ret == 0)) {
1166                 if (unlikely(tmp))
1167                         ret = 1;
1168                 else
1169                         put_user(1, p);
1170         }
1171         spin_unlock(&bfin_spinlock_lock);
1172         return ret;
1173 }
1174
1175 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1176 {
1177         void (*curr_handler)(void);
1178
1179         if (exception > 0x3F)
1180                 return -EINVAL;
1181
1182         curr_handler = ex_table[exception];
1183
1184         if (curr_handler != ex_replaceable)
1185                 return -EBUSY;
1186
1187         ex_table[exception] = handler;
1188
1189         return 0;
1190 }
1191 EXPORT_SYMBOL(bfin_request_exception);
1192
1193 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1194 {
1195         void (*curr_handler)(void);
1196
1197         if (exception > 0x3F)
1198                 return -EINVAL;
1199
1200         curr_handler = ex_table[exception];
1201
1202         if (curr_handler != handler)
1203                 return -EBUSY;
1204
1205         ex_table[exception] = ex_replaceable;
1206
1207         return 0;
1208 }
1209 EXPORT_SYMBOL(bfin_free_exception);
1210
1211 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1212 {
1213         switch (cplb_panic) {
1214         case CPLB_NO_UNLOCKED:
1215                 printk(KERN_EMERG "All CPLBs are locked\n");
1216                 break;
1217         case CPLB_PROT_VIOL:
1218                 return;
1219         case CPLB_NO_ADDR_MATCH:
1220                 return;
1221         case CPLB_UNKNOWN_ERR:
1222                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1223                 break;
1224         }
1225
1226         oops_in_progress = 1;
1227
1228         dump_bfin_process(fp);
1229         dump_bfin_mem(fp);
1230         show_regs(fp);
1231         dump_stack();
1232         panic("Unrecoverable event\n");
1233 }