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   1 /*
   2  * File:         arch/blackfin/kernel/traps.c
   3  * Based on:
   4  * Author:       Hamish Macdonald
   5  *
   6  * Created:
   7  * Description:  uses S/W interrupt 15 for the system calls
   8  *
   9  * Modified:
  10  *               Copyright 2004-2006 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 #include <linux/bug.h>
  31 #include <linux/uaccess.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/module.h>
  34 #include <linux/kallsyms.h>
  35 #include <linux/fs.h>
  36 #include <linux/rbtree.h>
  37 #include <asm/traps.h>
  38 #include <asm/cacheflush.h>
  39 #include <asm/cplb.h>
  40 #include <asm/dma.h>
  41 #include <asm/blackfin.h>
  42 #include <asm/irq_handler.h>
  43 #include <linux/irq.h>
  44 #include <asm/trace.h>
  45 #include <asm/fixed_code.h>
  46
  47 #ifdef CONFIG_KGDB
  48 # include <linux/kgdb.h>
  49
  50 # define CHK_DEBUGGER_TRAP() \
  51         do { \
  52                 kgdb_handle_exception(trapnr, sig, info.si_code, fp); \
  53         } while (0)
  54 # define CHK_DEBUGGER_TRAP_MAYBE() \
  55         do { \
  56                 if (kgdb_connected) \
  57                         CHK_DEBUGGER_TRAP(); \
  58         } while (0)
  59 #else
  60 # define CHK_DEBUGGER_TRAP() do { } while (0)
  61 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  62 #endif
  63
  64
  65 #ifdef CONFIG_DEBUG_VERBOSE
  66 #define verbose_printk(fmt, arg...) \
  67         printk(fmt, ##arg)
  68 #else
  69 #define verbose_printk(fmt, arg...) \
  70         ({ if (0) printk(fmt, ##arg); 0; })
  71 #endif
  72
  73 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
  74 u32 last_seqstat;
  75 #ifdef CONFIG_DEBUG_MMRS_MODULE
  76 EXPORT_SYMBOL(last_seqstat);
  77 #endif
  78 #endif
  79
  80 /* Initiate the event table handler */
  81 void __init trap_init(void)
  82 {
  83         CSYNC();
  84         bfin_write_EVT3(trap);
  85         CSYNC();
  86 }
  87
  88 static void decode_address(char *buf, unsigned long address)
  89 {
  90 #ifdef CONFIG_DEBUG_VERBOSE
  91         struct task_struct *p;
  92         struct mm_struct *mm;
  93         unsigned long flags, offset;
  94         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
  95         struct rb_node *n;
  96
  97 #ifdef CONFIG_KALLSYMS
  98         unsigned long symsize;
  99         const char *symname;
 100         char *modname;
 101         char *delim = ":";
 102         char namebuf[128];
 103
 104         /* look up the address and see if we are in kernel space */
 105         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
 106
 107         if (symname) {
 108                 /* yeah! kernel space! */
 109                 if (!modname)
 110                         modname = delim = "";
 111                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
 112                               (void *)address, delim, modname, delim, symname,
 113                               (unsigned long)offset);
 114                 return;
 115
 116         }
 117 #endif
 118
 119         /* Problem in fixed code section? */
 120         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 121                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
 122                 return;
 123         }
 124
 125         /* Problem somewhere before the kernel start address */
 126         if (address < CONFIG_BOOT_LOAD) {
 127                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
 128                 return;
 129         }
 130
 131         /* looks like we're off in user-land, so let's walk all the
 132          * mappings of all our processes and see if we can't be a whee
 133          * bit more specific
 134          */
 135         write_lock_irqsave(&tasklist_lock, flags);
 136         for_each_process(p) {
 137                 mm = (in_atomic ? p->mm : get_task_mm(p));
 138                 if (!mm)
 139                         continue;
 140
 141                 for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
 142                         struct vm_area_struct *vma;
 143
 144                         vma = rb_entry(n, struct vm_area_struct, vm_rb);
 145
 146                         if (address >= vma->vm_start && address < vma->vm_end) {
 147                                 char _tmpbuf[256];
 148                                 char *name = p->comm;
 149                                 struct file *file = vma->vm_file;
 150
 151                                 if (file) {
 152                                         char *d_name = d_path(&file->f_path, _tmpbuf,
 153                                                       sizeof(_tmpbuf));
 154                                         if (!IS_ERR(d_name))
 155                                                 name = d_name;
 156                                 }
 157
 158                                 /* FLAT does not have its text aligned to the start of
 159                                  * the map while FDPIC ELF does ...
 160                                  */
 161
 162                                 /* before we can check flat/fdpic, we need to
 163                                  * make sure current is valid
 164                                  */
 165                                 if ((unsigned long)current >= FIXED_CODE_START &&
 166                                     !((unsigned long)current & 0x3)) {
 167                                         if (current->mm &&
 168                                             (address > current->mm->start_code) &&
 169                                             (address < current->mm->end_code))
 170                                                 offset = address - current->mm->start_code;
 171                                         else
 172                                                 offset = (address - vma->vm_start) +
 173                                                          (vma->vm_pgoff << PAGE_SHIFT);
 174
 175                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 176                                                 (void *)address, name, offset);
 177                                 } else
 178                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
 179                                                 (void *)address, name,
 180                                                 vma->vm_start, vma->vm_end);
 181
 182                                 if (!in_atomic)
 183                                         mmput(mm);
 184
 185                                 if (!strlen(buf))
 186                                         sprintf(buf, "<0x%p> [ %s ] dynamic memory", (void *)address, name);
 187
 188                                 goto done;
 189                         }
 190                 }
 191                 if (!in_atomic)
 192                         mmput(mm);
 193         }
 194
 195         /* we were unable to find this address anywhere */
 196         sprintf(buf, "<0x%p> /* kernel dynamic memory */", (void *)address);
 197
 198 done:
 199         write_unlock_irqrestore(&tasklist_lock, flags);
 200 #else
 201         sprintf(buf, " ");
 202 #endif
 203 }
 204
 205 asmlinkage void double_fault_c(struct pt_regs *fp)
 206 {
 207 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 208         int j;
 209         trace_buffer_save(j);
 210 #endif
 211
 212         console_verbose();
 213         oops_in_progress = 1;
 214 #ifdef CONFIG_DEBUG_VERBOSE
 215         printk(KERN_EMERG "Double Fault\n");
 216 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 217         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 218                 unsigned int cpu = smp_processor_id();
 219                 char buf[150];
 220                 decode_address(buf, cpu_pda[cpu].retx);
 221                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 222                         (unsigned int)cpu_pda[cpu].seqstat & SEQSTAT_EXCAUSE, buf);
 223                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
 224                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 225                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
 226                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 227
 228                 decode_address(buf, fp->retx);
 229                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
 230         } else
 231 #endif
 232         {
 233                 dump_bfin_process(fp);
 234                 dump_bfin_mem(fp);
 235                 show_regs(fp);
 236                 dump_bfin_trace_buffer();
 237         }
 238 #endif
 239         panic("Double Fault - unrecoverable event");
 240
 241 }
 242
 243 static int kernel_mode_regs(struct pt_regs *regs)
 244 {
 245         return regs->ipend & 0xffc0;
 246 }
 247
 248 asmlinkage void trap_c(struct pt_regs *fp)
 249 {
 250 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 251         int j;
 252 #endif
 253 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 254         unsigned int cpu = smp_processor_id();
 255 #endif
 256         const char *strerror = NULL;
 257         int sig = 0;
 258         siginfo_t info;
 259         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 260
 261         trace_buffer_save(j);
 262 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
 263         last_seqstat = (u32)fp->seqstat;
 264 #endif
 265
 266         /* Important - be very careful dereferncing pointers - will lead to
 267          * double faults if the stack has become corrupt
 268          */
 269
 270 #ifndef CONFIG_KGDB
 271         /* IPEND is skipped if KGDB isn't enabled (see entry code) */
 272         fp->ipend = bfin_read_IPEND();
 273 #endif
 274
 275         /* trap_c() will be called for exceptions. During exceptions
 276          * processing, the pc value should be set with retx value.
 277          * With this change we can cleanup some code in signal.c- TODO
 278          */
 279         fp->orig_pc = fp->retx;
 280         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 281                 trapnr, fp->ipend, fp->pc, fp->retx); */
 282
 283         /* send the appropriate signal to the user program */
 284         switch (trapnr) {
 285
 286         /* This table works in conjuction with the one in ./mach-common/entry.S
 287          * Some exceptions are handled there (in assembly, in exception space)
 288          * Some are handled here, (in C, in interrupt space)
 289          * Some, like CPLB, are handled in both, where the normal path is
 290          * handled in assembly/exception space, and the error path is handled
 291          * here
 292          */
 293
 294         /* 0x00 - Linux Syscall, getting here is an error */
 295         /* 0x01 - userspace gdb breakpoint, handled here */
 296         case VEC_EXCPT01:
 297                 info.si_code = TRAP_ILLTRAP;
 298                 sig = SIGTRAP;
 299                 CHK_DEBUGGER_TRAP_MAYBE();
 300                 /* Check if this is a breakpoint in kernel space */
 301                 if (kernel_mode_regs(fp))
 302                         goto traps_done;
 303                 else
 304                         break;
 305         /* 0x03 - User Defined, userspace stack overflow */
 306         case VEC_EXCPT03:
 307                 info.si_code = SEGV_STACKFLOW;
 308                 sig = SIGSEGV;
 309                 strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
 310                 CHK_DEBUGGER_TRAP_MAYBE();
 311                 break;
 312         /* 0x02 - KGDB initial connection and break signal trap */
 313         case VEC_EXCPT02:
 314 #ifdef CONFIG_KGDB
 315                 info.si_code = TRAP_ILLTRAP;
 316                 sig = SIGTRAP;
 317                 CHK_DEBUGGER_TRAP();
 318                 goto traps_done;
 319 #endif
 320         /* 0x04 - User Defined */
 321         /* 0x05 - User Defined */
 322         /* 0x06 - User Defined */
 323         /* 0x07 - User Defined */
 324         /* 0x08 - User Defined */
 325         /* 0x09 - User Defined */
 326         /* 0x0A - User Defined */
 327         /* 0x0B - User Defined */
 328         /* 0x0C - User Defined */
 329         /* 0x0D - User Defined */
 330         /* 0x0E - User Defined */
 331         /* 0x0F - User Defined */
 332         /* If we got here, it is most likely that someone was trying to use a
 333          * custom exception handler, and it is not actually installed properly
 334          */
 335         case VEC_EXCPT04 ... VEC_EXCPT15:
 336                 info.si_code = ILL_ILLPARAOP;
 337                 sig = SIGILL;
 338                 strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
 339                 CHK_DEBUGGER_TRAP_MAYBE();
 340                 break;
 341         /* 0x10 HW Single step, handled here */
 342         case VEC_STEP:
 343                 info.si_code = TRAP_STEP;
 344                 sig = SIGTRAP;
 345                 CHK_DEBUGGER_TRAP_MAYBE();
 346                 /* Check if this is a single step in kernel space */
 347                 if (kernel_mode_regs(fp))
 348                         goto traps_done;
 349                 else
 350                         break;
 351         /* 0x11 - Trace Buffer Full, handled here */
 352         case VEC_OVFLOW:
 353                 info.si_code = TRAP_TRACEFLOW;
 354                 sig = SIGTRAP;
 355                 strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
 356                 CHK_DEBUGGER_TRAP_MAYBE();
 357                 break;
 358         /* 0x12 - Reserved, Caught by default */
 359         /* 0x13 - Reserved, Caught by default */
 360         /* 0x14 - Reserved, Caught by default */
 361         /* 0x15 - Reserved, Caught by default */
 362         /* 0x16 - Reserved, Caught by default */
 363         /* 0x17 - Reserved, Caught by default */
 364         /* 0x18 - Reserved, Caught by default */
 365         /* 0x19 - Reserved, Caught by default */
 366         /* 0x1A - Reserved, Caught by default */
 367         /* 0x1B - Reserved, Caught by default */
 368         /* 0x1C - Reserved, Caught by default */
 369         /* 0x1D - Reserved, Caught by default */
 370         /* 0x1E - Reserved, Caught by default */
 371         /* 0x1F - Reserved, Caught by default */
 372         /* 0x20 - Reserved, Caught by default */
 373         /* 0x21 - Undefined Instruction, handled here */
 374         case VEC_UNDEF_I:
 375 #ifdef CONFIG_BUG
 376                 if (kernel_mode_regs(fp)) {
 377                         switch (report_bug(fp->pc, fp)) {
 378                         case BUG_TRAP_TYPE_NONE:
 379                                 break;
 380                         case BUG_TRAP_TYPE_WARN:
 381                                 dump_bfin_trace_buffer();
 382                                 fp->pc += 2;
 383                                 goto traps_done;
 384                         case BUG_TRAP_TYPE_BUG:
 385                                 /* call to panic() will dump trace, and it is
 386                                  * off at this point, so it won't be clobbered
 387                                  */
 388                                 panic("BUG()");
 389                         }
 390                 }
 391 #endif
 392                 info.si_code = ILL_ILLOPC;
 393                 sig = SIGILL;
 394                 strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
 395                 CHK_DEBUGGER_TRAP_MAYBE();
 396                 break;
 397         /* 0x22 - Illegal Instruction Combination, handled here */
 398         case VEC_ILGAL_I:
 399                 info.si_code = ILL_ILLPARAOP;
 400                 sig = SIGILL;
 401                 strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
 402                 CHK_DEBUGGER_TRAP_MAYBE();
 403                 break;
 404         /* 0x23 - Data CPLB protection violation, handled here */
 405         case VEC_CPLB_VL:
 406                 info.si_code = ILL_CPLB_VI;
 407                 sig = SIGBUS;
 408                 strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
 409                 CHK_DEBUGGER_TRAP_MAYBE();
 410                 break;
 411         /* 0x24 - Data access misaligned, handled here */
 412         case VEC_MISALI_D:
 413                 info.si_code = BUS_ADRALN;
 414                 sig = SIGBUS;
 415                 strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
 416                 CHK_DEBUGGER_TRAP_MAYBE();
 417                 break;
 418         /* 0x25 - Unrecoverable Event, handled here */
 419         case VEC_UNCOV:
 420                 info.si_code = ILL_ILLEXCPT;
 421                 sig = SIGILL;
 422                 strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
 423                 CHK_DEBUGGER_TRAP_MAYBE();
 424                 break;
 425         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 426                 error case is handled here */
 427         case VEC_CPLB_M:
 428                 info.si_code = BUS_ADRALN;
 429                 sig = SIGBUS;
 430                 strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
 431                 break;
 432         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 433         case VEC_CPLB_MHIT:
 434                 info.si_code = ILL_CPLB_MULHIT;
 435                 sig = SIGSEGV;
 436 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 437                 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
 438                         strerror = KERN_NOTICE "NULL pointer access\n";
 439                 else
 440 #endif
 441                         strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
 442                 CHK_DEBUGGER_TRAP_MAYBE();
 443                 break;
 444         /* 0x28 - Emulation Watchpoint, handled here */
 445         case VEC_WATCH:
 446                 info.si_code = TRAP_WATCHPT;
 447                 sig = SIGTRAP;
 448                 pr_debug(EXC_0x28(KERN_DEBUG));
 449                 CHK_DEBUGGER_TRAP_MAYBE();
 450                 /* Check if this is a watchpoint in kernel space */
 451                 if (kernel_mode_regs(fp))
 452                         goto traps_done;
 453                 else
 454                         break;
 455 #ifdef CONFIG_BF535
 456         /* 0x29 - Instruction fetch access error (535 only) */
 457         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 458                 info.si_code = BUS_OPFETCH;
 459                 sig = SIGBUS;
 460                 strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
 461                 CHK_DEBUGGER_TRAP_MAYBE();
 462                 break;
 463 #else
 464         /* 0x29 - Reserved, Caught by default */
 465 #endif
 466         /* 0x2A - Instruction fetch misaligned, handled here */
 467         case VEC_MISALI_I:
 468                 info.si_code = BUS_ADRALN;
 469                 sig = SIGBUS;
 470                 strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
 471                 CHK_DEBUGGER_TRAP_MAYBE();
 472                 break;
 473         /* 0x2B - Instruction CPLB protection violation, handled here */
 474         case VEC_CPLB_I_VL:
 475                 info.si_code = ILL_CPLB_VI;
 476                 sig = SIGBUS;
 477                 strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
 478                 CHK_DEBUGGER_TRAP_MAYBE();
 479                 break;
 480         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 481         case VEC_CPLB_I_M:
 482                 info.si_code = ILL_CPLB_MISS;
 483                 sig = SIGBUS;
 484                 strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
 485                 break;
 486         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 487         case VEC_CPLB_I_MHIT:
 488                 info.si_code = ILL_CPLB_MULHIT;
 489                 sig = SIGSEGV;
 490 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 491                 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
 492                         strerror = KERN_NOTICE "Jump to NULL address\n";
 493                 else
 494 #endif
 495                         strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
 496                 CHK_DEBUGGER_TRAP_MAYBE();
 497                 break;
 498         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 499         case VEC_ILL_RES:
 500                 info.si_code = ILL_PRVOPC;
 501                 sig = SIGILL;
 502                 strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
 503                 CHK_DEBUGGER_TRAP_MAYBE();
 504                 break;
 505         /* 0x2F - Reserved, Caught by default */
 506         /* 0x30 - Reserved, Caught by default */
 507         /* 0x31 - Reserved, Caught by default */
 508         /* 0x32 - Reserved, Caught by default */
 509         /* 0x33 - Reserved, Caught by default */
 510         /* 0x34 - Reserved, Caught by default */
 511         /* 0x35 - Reserved, Caught by default */
 512         /* 0x36 - Reserved, Caught by default */
 513         /* 0x37 - Reserved, Caught by default */
 514         /* 0x38 - Reserved, Caught by default */
 515         /* 0x39 - Reserved, Caught by default */
 516         /* 0x3A - Reserved, Caught by default */
 517         /* 0x3B - Reserved, Caught by default */
 518         /* 0x3C - Reserved, Caught by default */
 519         /* 0x3D - Reserved, Caught by default */
 520         /* 0x3E - Reserved, Caught by default */
 521         /* 0x3F - Reserved, Caught by default */
 522         case VEC_HWERR:
 523                 info.si_code = BUS_ADRALN;
 524                 sig = SIGBUS;
 525                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 526                 /* System MMR Error */
 527                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 528                         info.si_code = BUS_ADRALN;
 529                         sig = SIGBUS;
 530                         strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
 531                         break;
 532                 /* External Memory Addressing Error */
 533                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 534                         info.si_code = BUS_ADRERR;
 535                         sig = SIGBUS;
 536                         strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
 537                         break;
 538                 /* Performance Monitor Overflow */
 539                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 540                         strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
 541                         break;
 542                 /* RAISE 5 instruction */
 543                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 544                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 545                         break;
 546                 default:        /* Reserved */
 547                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 548                         break;
 549                 }
 550                 CHK_DEBUGGER_TRAP_MAYBE();
 551                 break;
 552         /*
 553          * We should be handling all known exception types above,
 554          * if we get here we hit a reserved one, so panic
 555          */
 556         default:
 557                 info.si_code = ILL_ILLPARAOP;
 558                 sig = SIGILL;
 559                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 560                         (fp->seqstat & SEQSTAT_EXCAUSE));
 561                 CHK_DEBUGGER_TRAP_MAYBE();
 562                 break;
 563         }
 564
 565         BUG_ON(sig == 0);
 566
 567         /* If the fault was caused by a kernel thread, or interrupt handler
 568          * we will kernel panic, so the system reboots.
 569          */
 570         if (kernel_mode_regs(fp) || (current && !current->mm)) {
 571                 console_verbose();
 572                 oops_in_progress = 1;
 573                 if (strerror)
 574                         verbose_printk(strerror);
 575         }
 576
 577         if (sig != SIGTRAP) {
 578                 dump_bfin_process(fp);
 579                 dump_bfin_mem(fp);
 580                 show_regs(fp);
 581
 582                 /* Print out the trace buffer if it makes sense */
 583 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 584                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 585                         verbose_printk(KERN_NOTICE "No trace since you do not have "
 586                                "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n");
 587                 else
 588 #endif
 589                         dump_bfin_trace_buffer();
 590
 591                 if (oops_in_progress) {
 592                         /* Dump the current kernel stack */
 593                         verbose_printk(KERN_NOTICE "Kernel Stack\n");
 594                         show_stack(current, NULL);
 595                         print_modules();
 596 #ifndef CONFIG_ACCESS_CHECK
 597                         verbose_printk(KERN_EMERG "Please turn on "
 598                                "CONFIG_ACCESS_CHECK\n");
 599 #endif
 600                         panic("Kernel exception");
 601                 } else {
 602 #ifdef CONFIG_DEBUG_VERBOSE
 603                         unsigned long *stack;
 604                         /* Dump the user space stack */
 605                         stack = (unsigned long *)rdusp();
 606                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
 607                         show_stack(NULL, stack);
 608 #endif
 609                 }
 610         }
 611
 612 #ifdef CONFIG_IPIPE
 613         if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
 614 #endif
 615         {
 616                 info.si_signo = sig;
 617                 info.si_errno = 0;
 618                 info.si_addr = (void __user *)fp->pc;
 619                 force_sig_info(sig, &info, current);
 620         }
 621
 622         if (ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8))
 623                 fp->pc = SAFE_USER_INSTRUCTION;
 624
 625  traps_done:
 626         trace_buffer_restore(j);
 627 }
 628
 629 /* Typical exception handling routines  */
 630
 631 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 632
 633 /*
 634  * Similar to get_user, do some address checking, then dereference
 635  * Return true on sucess, false on bad address
 636  */
 637 static bool get_instruction(unsigned short *val, unsigned short *address)
 638 {
 639         unsigned long addr = (unsigned long)address;
 640
 641         /* Check for odd addresses */
 642         if (addr & 0x1)
 643                 return false;
 644
 645         /* MMR region will never have instructions */
 646         if (addr >= SYSMMR_BASE)
 647                 return false;
 648
 649         switch (bfin_mem_access_type(addr, 2)) {
 650                 case BFIN_MEM_ACCESS_CORE:
 651                 case BFIN_MEM_ACCESS_CORE_ONLY:
 652                         *val = *address;
 653                         return true;
 654                 case BFIN_MEM_ACCESS_DMA:
 655                         dma_memcpy(val, address, 2);
 656                         return true;
 657                 case BFIN_MEM_ACCESS_ITEST:
 658                         isram_memcpy(val, address, 2);
 659                         return true;
 660                 default: /* invalid access */
 661                         return false;
 662         }
 663 }
 664
 665 /*
 666  * decode the instruction if we are printing out the trace, as it
 667  * makes things easier to follow, without running it through objdump
 668  * These are the normal instructions which cause change of flow, which
 669  * would be at the source of the trace buffer
 670  */
 671 #if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
 672 static void decode_instruction(unsigned short *address)
 673 {
 674         unsigned short opcode;
 675
 676         if (get_instruction(&opcode, address)) {
 677                 if (opcode == 0x0010)
 678                         verbose_printk("RTS");
 679                 else if (opcode == 0x0011)
 680                         verbose_printk("RTI");
 681                 else if (opcode == 0x0012)
 682                         verbose_printk("RTX");
 683                 else if (opcode == 0x0013)
 684                         verbose_printk("RTN");
 685                 else if (opcode == 0x0014)
 686                         verbose_printk("RTE");
 687                 else if (opcode == 0x0025)
 688                         verbose_printk("EMUEXCPT");
 689                 else if (opcode == 0x0040 && opcode <= 0x0047)
 690                         verbose_printk("STI R%i", opcode & 7);
 691                 else if (opcode >= 0x0050 && opcode <= 0x0057)
 692                         verbose_printk("JUMP (P%i)", opcode & 7);
 693                 else if (opcode >= 0x0060 && opcode <= 0x0067)
 694                         verbose_printk("CALL (P%i)", opcode & 7);
 695                 else if (opcode >= 0x0070 && opcode <= 0x0077)
 696                         verbose_printk("CALL (PC+P%i)", opcode & 7);
 697                 else if (opcode >= 0x0080 && opcode <= 0x0087)
 698                         verbose_printk("JUMP (PC+P%i)", opcode & 7);
 699                 else if (opcode >= 0x0090 && opcode <= 0x009F)
 700                         verbose_printk("RAISE 0x%x", opcode & 0xF);
 701                 else if (opcode >= 0x00A0 && opcode <= 0x00AF)
 702                         verbose_printk("EXCPT 0x%x", opcode & 0xF);
 703                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
 704                         verbose_printk("IF !CC JUMP");
 705                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
 706                         verbose_printk("IF CC JUMP");
 707                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
 708                         verbose_printk("JUMP.S");
 709                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
 710                         verbose_printk("LSETUP");
 711                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
 712                         verbose_printk("JUMP.L");
 713                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
 714                         verbose_printk("CALL pcrel");
 715                 else
 716                         verbose_printk("0x%04x", opcode);
 717         }
 718
 719 }
 720 #endif
 721
 722 void dump_bfin_trace_buffer(void)
 723 {
 724 #ifdef CONFIG_DEBUG_VERBOSE
 725 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 726         int tflags, i = 0;
 727         char buf[150];
 728         unsigned short *addr;
 729 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 730         int j, index;
 731 #endif
 732
 733         trace_buffer_save(tflags);
 734
 735         printk(KERN_NOTICE "Hardware Trace:\n");
 736
 737 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 738         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
 739 #endif
 740
 741         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 742                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 743                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 744                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 745                         addr = (unsigned short *)bfin_read_TBUF();
 746                         decode_address(buf, (unsigned long)addr);
 747                         printk(KERN_NOTICE "     Source : %s ", buf);
 748                         decode_instruction(addr);
 749                         printk("\n");
 750                 }
 751         }
 752
 753 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 754         if (trace_buff_offset)
 755                 index = trace_buff_offset / 4;
 756         else
 757                 index = EXPAND_LEN;
 758
 759         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 760         while (j) {
 761                 decode_address(buf, software_trace_buff[index]);
 762                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 763                 index -= 1;
 764                 if (index < 0 )
 765                         index = EXPAND_LEN;
 766                 decode_address(buf, software_trace_buff[index]);
 767                 printk(KERN_NOTICE "     Source : %s ", buf);
 768                 decode_instruction((unsigned short *)software_trace_buff[index]);
 769                 printk("\n");
 770                 index -= 1;
 771                 if (index < 0)
 772                         index = EXPAND_LEN;
 773                 j--;
 774                 i++;
 775         }
 776 #endif
 777
 778         trace_buffer_restore(tflags);
 779 #endif
 780 #endif
 781 }
 782 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 783
 784 #ifdef CONFIG_BUG
 785 int is_valid_bugaddr(unsigned long addr)
 786 {
 787         unsigned short opcode;
 788
 789         if (!get_instruction(&opcode, (unsigned short *)addr))
 790                 return 0;
 791
 792         return opcode == BFIN_BUG_OPCODE;
 793 }
 794 #endif
 795
 796 /*
 797  * Checks to see if the address pointed to is either a
 798  * 16-bit CALL instruction, or a 32-bit CALL instruction
 799  */
 800 static bool is_bfin_call(unsigned short *addr)
 801 {
 802         unsigned short opcode = 0, *ins_addr;
 803         ins_addr = (unsigned short *)addr;
 804
 805         if (!get_instruction(&opcode, ins_addr))
 806                 return false;
 807
 808         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
 809             (opcode >= 0x0070 && opcode <= 0x0077))
 810                 return true;
 811
 812         ins_addr--;
 813         if (!get_instruction(&opcode, ins_addr))
 814                 return false;
 815
 816         if (opcode >= 0xE300 && opcode <= 0xE3FF)
 817                 return true;
 818
 819         return false;
 820
 821 }
 822
 823 void show_stack(struct task_struct *task, unsigned long *stack)
 824 {
 825 #ifdef CONFIG_PRINTK
 826         unsigned int *addr, *endstack, *fp = 0, *frame;
 827         unsigned short *ins_addr;
 828         char buf[150];
 829         unsigned int i, j, ret_addr, frame_no = 0;
 830
 831         /*
 832          * If we have been passed a specific stack, use that one otherwise
 833          *    if we have been passed a task structure, use that, otherwise
 834          *    use the stack of where the variable "stack" exists
 835          */
 836
 837         if (stack == NULL) {
 838                 if (task) {
 839                         /* We know this is a kernel stack, so this is the start/end */
 840                         stack = (unsigned long *)task->thread.ksp;
 841                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
 842                 } else {
 843                         /* print out the existing stack info */
 844                         stack = (unsigned long *)&stack;
 845                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 846                 }
 847         } else
 848                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 849
 850         printk(KERN_NOTICE "Stack info:\n");
 851         decode_address(buf, (unsigned int)stack);
 852         printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
 853
 854         if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
 855                 printk(KERN_NOTICE "Invalid stack pointer\n");
 856                 return;
 857         }
 858
 859         /* First thing is to look for a frame pointer */
 860         for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
 861                 if (*addr & 0x1)
 862                         continue;
 863                 ins_addr = (unsigned short *)*addr;
 864                 ins_addr--;
 865                 if (is_bfin_call(ins_addr))
 866                         fp = addr - 1;
 867
 868                 if (fp) {
 869                         /* Let's check to see if it is a frame pointer */
 870                         while (fp >= (addr - 1) && fp < endstack
 871                                && fp && ((unsigned int) fp & 0x3) == 0)
 872                                 fp = (unsigned int *)*fp;
 873                         if (fp == 0 || fp == endstack) {
 874                                 fp = addr - 1;
 875                                 break;
 876                         }
 877                         fp = 0;
 878                 }
 879         }
 880         if (fp) {
 881                 frame = fp;
 882                 printk(KERN_NOTICE " FP: (0x%p)\n", fp);
 883         } else
 884                 frame = 0;
 885
 886         /*
 887          * Now that we think we know where things are, we
 888          * walk the stack again, this time printing things out
 889          * incase there is no frame pointer, we still look for
 890          * valid return addresses
 891          */
 892
 893         /* First time print out data, next time, print out symbols */
 894         for (j = 0; j <= 1; j++) {
 895                 if (j)
 896                         printk(KERN_NOTICE "Return addresses in stack:\n");
 897                 else
 898                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
 899
 900                 fp = frame;
 901                 frame_no = 0;
 902
 903                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 904                      addr <= endstack; addr++, i++) {
 905
 906                         ret_addr = 0;
 907                         if (!j && i % 8 == 0)
 908                                 printk(KERN_NOTICE "%p:",addr);
 909
 910                         /* if it is an odd address, or zero, just skip it */
 911                         if (*addr & 0x1 || !*addr)
 912                                 goto print;
 913
 914                         ins_addr = (unsigned short *)*addr;
 915
 916                         /* Go back one instruction, and see if it is a CALL */
 917                         ins_addr--;
 918                         ret_addr = is_bfin_call(ins_addr);
 919  print:
 920                         if (!j && stack == (unsigned long *)addr)
 921                                 printk("[%08x]", *addr);
 922                         else if (ret_addr)
 923                                 if (j) {
 924                                         decode_address(buf, (unsigned int)*addr);
 925                                         if (frame == addr) {
 926                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
 927                                                 continue;
 928                                         }
 929                                         printk(KERN_NOTICE "    address : %s\n", buf);
 930                                 } else
 931                                         printk("<%08x>", *addr);
 932                         else if (fp == addr) {
 933                                 if (j)
 934                                         frame = addr+1;
 935                                 else
 936                                         printk("(%08x)", *addr);
 937
 938                                 fp = (unsigned int *)*addr;
 939                                 frame_no++;
 940
 941                         } else if (!j)
 942                                 printk(" %08x ", *addr);
 943                 }
 944                 if (!j)
 945                         printk("\n");
 946         }
 947 #endif
 948 }
 949
 950 void dump_stack(void)
 951 {
 952         unsigned long stack;
 953 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 954         int tflags;
 955 #endif
 956         trace_buffer_save(tflags);
 957         dump_bfin_trace_buffer();
 958         show_stack(current, &stack);
 959         trace_buffer_restore(tflags);
 960 }
 961 EXPORT_SYMBOL(dump_stack);
 962
 963 void dump_bfin_process(struct pt_regs *fp)
 964 {
 965 #ifdef CONFIG_DEBUG_VERBOSE
 966         /* We should be able to look at fp->ipend, but we don't push it on the
 967          * stack all the time, so do this until we fix that */
 968         unsigned int context = bfin_read_IPEND();
 969
 970         if (oops_in_progress)
 971                 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
 972
 973         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 974                 verbose_printk(KERN_NOTICE "HW Error context\n");
 975         else if (context & 0x0020)
 976                 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
 977         else if (context & 0x3FC0)
 978                 verbose_printk(KERN_NOTICE "Interrupt context\n");
 979         else if (context & 0x4000)
 980                 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
 981         else if (context & 0x8000)
 982                 verbose_printk(KERN_NOTICE "Kernel process context\n");
 983
 984         /* Because we are crashing, and pointers could be bad, we check things
 985          * pretty closely before we use them
 986          */
 987         if ((unsigned long)current >= FIXED_CODE_START &&
 988             !((unsigned long)current & 0x3) && current->pid) {
 989                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
 990                 if (current->comm >= (char *)FIXED_CODE_START)
 991                         verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
 992                                 current->comm, current->pid);
 993                 else
 994                         verbose_printk(KERN_NOTICE "COMM= invalid\n");
 995
 996                 printk(KERN_NOTICE "CPU = %d\n", current_thread_info()->cpu);
 997                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
 998                         verbose_printk(KERN_NOTICE
 999                                 "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
1000                                 " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n\n",
1001                                 (void *)current->mm->start_code,
1002                                 (void *)current->mm->end_code,
1003                                 (void *)current->mm->start_data,
1004                                 (void *)current->mm->end_data,
1005                                 (void *)current->mm->end_data,
1006                                 (void *)current->mm->brk,
1007                                 (void *)current->mm->start_stack);
1008                 else
1009                         verbose_printk(KERN_NOTICE "invalid mm\n");
1010         } else
1011                 verbose_printk(KERN_NOTICE
1012                                "No Valid process in current context\n");
1013 #endif
1014 }
1015
1016 void dump_bfin_mem(struct pt_regs *fp)
1017 {
1018 #ifdef CONFIG_DEBUG_VERBOSE
1019         unsigned short *addr, *erraddr, val = 0, err = 0;
1020         char sti = 0, buf[6];
1021
1022         erraddr = (void *)fp->pc;
1023
1024         verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
1025
1026         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
1027              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
1028              addr++) {
1029                 if (!((unsigned long)addr & 0xF))
1030                         verbose_printk(KERN_NOTICE "0x%p: ", addr);
1031
1032                 if (!get_instruction(&val, addr)) {
1033                                 val = 0;
1034                                 sprintf(buf, "????");
1035                 } else
1036                         sprintf(buf, "%04x", val);
1037
1038                 if (addr == erraddr) {
1039                         verbose_printk("[%s]", buf);
1040                         err = val;
1041                 } else
1042                         verbose_printk(" %s ", buf);
1043
1044                 /* Do any previous instructions turn on interrupts? */
1045                 if (addr <= erraddr &&                          /* in the past */
1046                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
1047                       val == 0x017b))                           /* [SP++] = RETI */
1048                         sti = 1;
1049         }
1050
1051         verbose_printk("\n");
1052
1053         /* Hardware error interrupts can be deferred */
1054         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1055             oops_in_progress)){
1056                 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1057 #ifndef CONFIG_DEBUG_HWERR
1058                 verbose_printk(KERN_NOTICE
1059 "The remaining message may be meaningless\n"
1060 "You should enable CONFIG_DEBUG_HWERR to get a better idea where it came from\n");
1061 #else
1062                 /* If we are handling only one peripheral interrupt
1063                  * and current mm and pid are valid, and the last error
1064                  * was in that user space process's text area
1065                  * print it out - because that is where the problem exists
1066                  */
1067                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1068                      (current->pid && current->mm)) {
1069                         /* And the last RETI points to the current userspace context */
1070                         if ((fp + 1)->pc >= current->mm->start_code &&
1071                             (fp + 1)->pc <= current->mm->end_code) {
1072                                 verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
1073                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1074                                 show_regs(fp + 1);
1075                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1076                         }
1077                 }
1078 #endif
1079         }
1080 #endif
1081 }
1082
1083 void show_regs(struct pt_regs *fp)
1084 {
1085 #ifdef CONFIG_DEBUG_VERBOSE
1086         char buf [150];
1087         struct irqaction *action;
1088         unsigned int i;
1089         unsigned long flags = 0;
1090         unsigned int cpu = smp_processor_id();
1091         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
1092
1093         verbose_printk(KERN_NOTICE "\n");
1094         if (CPUID != bfin_cpuid())
1095                 verbose_printk(KERN_NOTICE "Compiled for cpu family 0x%04x (Rev %d), "
1096                         "but running on:0x%04x (Rev %d)\n",
1097                         CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid());
1098
1099         verbose_printk(KERN_NOTICE "ADSP-%s-0.%d",
1100                 CPU, bfin_compiled_revid());
1101
1102         if (bfin_compiled_revid() !=  bfin_revid())
1103                 verbose_printk("(Detected 0.%d)", bfin_revid());
1104
1105         verbose_printk(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n",
1106                 get_cclk()/1000000, get_sclk()/1000000,
1107 #ifdef CONFIG_MPU
1108                 "mpu on"
1109 #else
1110                 "mpu off"
1111 #endif
1112                 );
1113
1114         verbose_printk(KERN_NOTICE "%s", linux_banner);
1115
1116         verbose_printk(KERN_NOTICE "\nSEQUENCER STATUS:\t\t%s\n",
1117                        print_tainted());
1118         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
1119                        (long)fp->seqstat, fp->ipend, fp->syscfg);
1120         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1121                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1122                         (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1123 #ifdef EBIU_ERRMST
1124                 /* If the error was from the EBIU, print it out */
1125                 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1126                         verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
1127                                 bfin_read_EBIU_ERRMST());
1128                         verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
1129                                 bfin_read_EBIU_ERRADD());
1130                 }
1131 #endif
1132         }
1133         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1134                 fp->seqstat & SEQSTAT_EXCAUSE);
1135         for (i = 2; i <= 15 ; i++) {
1136                 if (fp->ipend & (1 << i)) {
1137                         if (i != 4) {
1138                                 decode_address(buf, bfin_read32(EVT0 + 4*i));
1139                                 verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1140                         } else
1141                                 verbose_printk(KERN_NOTICE "  interrupts disabled\n");
1142                 }
1143         }
1144
1145         /* if no interrupts are going off, don't print this out */
1146         if (fp->ipend & ~0x3F) {
1147                 for (i = 0; i < (NR_IRQS - 1); i++) {
1148                         if (!in_atomic)
1149                                 spin_lock_irqsave(&irq_desc[i].lock, flags);
1150
1151                         action = irq_desc[i].action;
1152                         if (!action)
1153                                 goto unlock;
1154
1155                         decode_address(buf, (unsigned int)action->handler);
1156                         verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1157                         for (action = action->next; action; action = action->next) {
1158                                 decode_address(buf, (unsigned int)action->handler);
1159                                 verbose_printk(", %s", buf);
1160                         }
1161                         verbose_printk("\n");
1162 unlock:
1163                         if (!in_atomic)
1164                                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1165                 }
1166         }
1167
1168         decode_address(buf, fp->rete);
1169         verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1170         decode_address(buf, fp->retn);
1171         verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1172         decode_address(buf, fp->retx);
1173         verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1174         decode_address(buf, fp->rets);
1175         verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1176         decode_address(buf, fp->pc);
1177         verbose_printk(KERN_NOTICE " PC  : %s\n", buf);
1178
1179         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1180             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1181                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
1182                 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1183                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
1184                 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1185         }
1186
1187         verbose_printk(KERN_NOTICE "PROCESSOR STATE:\n");
1188         verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1189                 fp->r0, fp->r1, fp->r2, fp->r3);
1190         verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1191                 fp->r4, fp->r5, fp->r6, fp->r7);
1192         verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1193                 fp->p0, fp->p1, fp->p2, fp->p3);
1194         verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1195                 fp->p4, fp->p5, fp->fp, (long)fp);
1196         verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1197                 fp->lb0, fp->lt0, fp->lc0);
1198         verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1199                 fp->lb1, fp->lt1, fp->lc1);
1200         verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1201                 fp->b0, fp->l0, fp->m0, fp->i0);
1202         verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1203                 fp->b1, fp->l1, fp->m1, fp->i1);
1204         verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1205                 fp->b2, fp->l2, fp->m2, fp->i2);
1206         verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1207                 fp->b3, fp->l3, fp->m3, fp->i3);
1208         verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1209                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1210
1211         verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1212                 rdusp(), fp->astat);
1213
1214         verbose_printk(KERN_NOTICE "\n");
1215 #endif
1216 }
1217
1218 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1219 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1220 #endif
1221
1222 static DEFINE_SPINLOCK(bfin_spinlock_lock);
1223
1224 asmlinkage int sys_bfin_spinlock(int *p)
1225 {
1226         int ret, tmp = 0;
1227
1228         spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
1229         ret = get_user(tmp, p);
1230         if (likely(ret == 0)) {
1231                 if (unlikely(tmp))
1232                         ret = 1;
1233                 else
1234                         put_user(1, p);
1235         }
1236         spin_unlock(&bfin_spinlock_lock);
1237         return ret;
1238 }
1239
1240 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1241 {
1242         void (*curr_handler)(void);
1243
1244         if (exception > 0x3F)
1245                 return -EINVAL;
1246
1247         curr_handler = ex_table[exception];
1248
1249         if (curr_handler != ex_replaceable)
1250                 return -EBUSY;
1251
1252         ex_table[exception] = handler;
1253
1254         return 0;
1255 }
1256 EXPORT_SYMBOL(bfin_request_exception);
1257
1258 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1259 {
1260         void (*curr_handler)(void);
1261
1262         if (exception > 0x3F)
1263                 return -EINVAL;
1264
1265         curr_handler = ex_table[exception];
1266
1267         if (curr_handler != handler)
1268                 return -EBUSY;
1269
1270         ex_table[exception] = ex_replaceable;
1271
1272         return 0;
1273 }
1274 EXPORT_SYMBOL(bfin_free_exception);
1275
1276 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1277 {
1278         switch (cplb_panic) {
1279         case CPLB_NO_UNLOCKED:
1280                 printk(KERN_EMERG "All CPLBs are locked\n");
1281                 break;
1282         case CPLB_PROT_VIOL:
1283                 return;
1284         case CPLB_NO_ADDR_MATCH:
1285                 return;
1286         case CPLB_UNKNOWN_ERR:
1287                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1288                 break;
1289         }
1290
1291         oops_in_progress = 1;
1292
1293         dump_bfin_process(fp);
1294         dump_bfin_mem(fp);
1295         show_regs(fp);
1296         dump_stack();
1297         panic("Unrecoverable event");
1298 }