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/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 #endif
 104
 105         buf += sprintf(buf, "<0x%08lx> ", address);
 106
 107 #ifdef CONFIG_KALLSYMS
 108         /* look up the address and see if we are in kernel space */
 109         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
 110
 111         if (symname) {
 112                 /* yeah! kernel space! */
 113                 if (!modname)
 114                         modname = delim = "";
 115                 sprintf(buf, "{ %s%s%s%s + 0x%lx }",
 116                         delim, modname, delim, symname,
 117                         (unsigned long)offset);
 118                 return;
 119         }
 120 #endif
 121
 122         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 123                 /* Problem in fixed code section? */
 124                 strcat(buf, "/* Maybe fixed code section */");
 125                 return;
 126
 127         } else if (address < CONFIG_BOOT_LOAD) {
 128                 /* Problem somewhere before the kernel start address */
 129                 strcat(buf, "/* Maybe null pointer? */");
 130                 return;
 131
 132         } else if (address >= COREMMR_BASE) {
 133                 strcat(buf, "/* core mmrs */");
 134                 return;
 135
 136         } else if (address >= SYSMMR_BASE) {
 137                 strcat(buf, "/* system mmrs */");
 138                 return;
 139
 140         } else if (address >= L1_ROM_START && address < L1_ROM_START + L1_ROM_LENGTH) {
 141                 strcat(buf, "/* on-chip L1 ROM */");
 142                 return;
 143         }
 144
 145         /* looks like we're off in user-land, so let's walk all the
 146          * mappings of all our processes and see if we can't be a whee
 147          * bit more specific
 148          */
 149         write_lock_irqsave(&tasklist_lock, flags);
 150         for_each_process(p) {
 151                 mm = (in_atomic ? p->mm : get_task_mm(p));
 152                 if (!mm)
 153                         continue;
 154
 155                 for (n = rb_first(&mm->mm_rb); n; n = rb_next(n)) {
 156                         struct vm_area_struct *vma;
 157
 158                         vma = rb_entry(n, struct vm_area_struct, vm_rb);
 159
 160                         if (address >= vma->vm_start && address < vma->vm_end) {
 161                                 char _tmpbuf[256];
 162                                 char *name = p->comm;
 163                                 struct file *file = vma->vm_file;
 164
 165                                 if (file) {
 166                                         char *d_name = d_path(&file->f_path, _tmpbuf,
 167                                                       sizeof(_tmpbuf));
 168                                         if (!IS_ERR(d_name))
 169                                                 name = d_name;
 170                                 }
 171
 172                                 /* FLAT does not have its text aligned to the start of
 173                                  * the map while FDPIC ELF does ...
 174                                  */
 175
 176                                 /* before we can check flat/fdpic, we need to
 177                                  * make sure current is valid
 178                                  */
 179                                 if ((unsigned long)current >= FIXED_CODE_START &&
 180                                     !((unsigned long)current & 0x3)) {
 181                                         if (current->mm &&
 182                                             (address > current->mm->start_code) &&
 183                                             (address < current->mm->end_code))
 184                                                 offset = address - current->mm->start_code;
 185                                         else
 186                                                 offset = (address - vma->vm_start) +
 187                                                          (vma->vm_pgoff << PAGE_SHIFT);
 188
 189                                         sprintf(buf, "[ %s + 0x%lx ]", name, offset);
 190                                 } else
 191                                         sprintf(buf, "[ %s vma:0x%lx-0x%lx]",
 192                                                 name, vma->vm_start, vma->vm_end);
 193
 194                                 if (!in_atomic)
 195                                         mmput(mm);
 196
 197                                 if (buf[0] == '\0')
 198                                         sprintf(buf, "[ %s ] dynamic memory", name);
 199
 200                                 goto done;
 201                         }
 202                 }
 203                 if (!in_atomic)
 204                         mmput(mm);
 205         }
 206
 207         /* we were unable to find this address anywhere */
 208         sprintf(buf, "/* kernel dynamic memory */");
 209
 210 done:
 211         write_unlock_irqrestore(&tasklist_lock, flags);
 212 #else
 213         sprintf(buf, " ");
 214 #endif
 215 }
 216
 217 asmlinkage void double_fault_c(struct pt_regs *fp)
 218 {
 219 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 220         int j;
 221         trace_buffer_save(j);
 222 #endif
 223
 224         console_verbose();
 225         oops_in_progress = 1;
 226 #ifdef CONFIG_DEBUG_VERBOSE
 227         printk(KERN_EMERG "Double Fault\n");
 228 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 229         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) == VEC_UNCOV) {
 230                 unsigned int cpu = raw_smp_processor_id();
 231                 char buf[150];
 232                 decode_address(buf, cpu_pda[cpu].retx_doublefault);
 233                 printk(KERN_EMERG "While handling exception (EXCAUSE = 0x%x) at %s:\n",
 234                         (unsigned int)cpu_pda[cpu].seqstat_doublefault & SEQSTAT_EXCAUSE, buf);
 235                 decode_address(buf, cpu_pda[cpu].dcplb_doublefault_addr);
 236                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %s\n", buf);
 237                 decode_address(buf, cpu_pda[cpu].icplb_doublefault_addr);
 238                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %s\n", buf);
 239
 240                 decode_address(buf, fp->retx);
 241                 printk(KERN_NOTICE "The instruction at %s caused a double exception\n", buf);
 242         } else
 243 #endif
 244         {
 245                 dump_bfin_process(fp);
 246                 dump_bfin_mem(fp);
 247                 show_regs(fp);
 248                 dump_bfin_trace_buffer();
 249         }
 250 #endif
 251         panic("Double Fault - unrecoverable event");
 252
 253 }
 254
 255 static int kernel_mode_regs(struct pt_regs *regs)
 256 {
 257         return regs->ipend & 0xffc0;
 258 }
 259
 260 asmlinkage notrace void trap_c(struct pt_regs *fp)
 261 {
 262 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 263         int j;
 264 #endif
 265 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 266         unsigned int cpu = raw_smp_processor_id();
 267 #endif
 268         const char *strerror = NULL;
 269         int sig = 0;
 270         siginfo_t info;
 271         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 272
 273         trace_buffer_save(j);
 274 #if defined(CONFIG_DEBUG_MMRS) || defined(CONFIG_DEBUG_MMRS_MODULE)
 275         last_seqstat = (u32)fp->seqstat;
 276 #endif
 277
 278         /* Important - be very careful dereferncing pointers - will lead to
 279          * double faults if the stack has become corrupt
 280          */
 281
 282         /* trap_c() will be called for exceptions. During exceptions
 283          * processing, the pc value should be set with retx value.
 284          * With this change we can cleanup some code in signal.c- TODO
 285          */
 286         fp->orig_pc = fp->retx;
 287         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 288                 trapnr, fp->ipend, fp->pc, fp->retx); */
 289
 290         /* send the appropriate signal to the user program */
 291         switch (trapnr) {
 292
 293         /* This table works in conjuction with the one in ./mach-common/entry.S
 294          * Some exceptions are handled there (in assembly, in exception space)
 295          * Some are handled here, (in C, in interrupt space)
 296          * Some, like CPLB, are handled in both, where the normal path is
 297          * handled in assembly/exception space, and the error path is handled
 298          * here
 299          */
 300
 301         /* 0x00 - Linux Syscall, getting here is an error */
 302         /* 0x01 - userspace gdb breakpoint, handled here */
 303         case VEC_EXCPT01:
 304                 info.si_code = TRAP_ILLTRAP;
 305                 sig = SIGTRAP;
 306                 CHK_DEBUGGER_TRAP_MAYBE();
 307                 /* Check if this is a breakpoint in kernel space */
 308                 if (kernel_mode_regs(fp))
 309                         goto traps_done;
 310                 else
 311                         break;
 312         /* 0x03 - User Defined, userspace stack overflow */
 313         case VEC_EXCPT03:
 314                 info.si_code = SEGV_STACKFLOW;
 315                 sig = SIGSEGV;
 316                 strerror = KERN_NOTICE EXC_0x03(KERN_NOTICE);
 317                 CHK_DEBUGGER_TRAP_MAYBE();
 318                 break;
 319         /* 0x02 - KGDB initial connection and break signal trap */
 320         case VEC_EXCPT02:
 321 #ifdef CONFIG_KGDB
 322                 info.si_code = TRAP_ILLTRAP;
 323                 sig = SIGTRAP;
 324                 CHK_DEBUGGER_TRAP();
 325                 goto traps_done;
 326 #endif
 327         /* 0x04 - User Defined */
 328         /* 0x05 - User Defined */
 329         /* 0x06 - User Defined */
 330         /* 0x07 - User Defined */
 331         /* 0x08 - User Defined */
 332         /* 0x09 - User Defined */
 333         /* 0x0A - User Defined */
 334         /* 0x0B - User Defined */
 335         /* 0x0C - User Defined */
 336         /* 0x0D - User Defined */
 337         /* 0x0E - User Defined */
 338         /* 0x0F - User Defined */
 339         /* If we got here, it is most likely that someone was trying to use a
 340          * custom exception handler, and it is not actually installed properly
 341          */
 342         case VEC_EXCPT04 ... VEC_EXCPT15:
 343                 info.si_code = ILL_ILLPARAOP;
 344                 sig = SIGILL;
 345                 strerror = KERN_NOTICE EXC_0x04(KERN_NOTICE);
 346                 CHK_DEBUGGER_TRAP_MAYBE();
 347                 break;
 348         /* 0x10 HW Single step, handled here */
 349         case VEC_STEP:
 350                 info.si_code = TRAP_STEP;
 351                 sig = SIGTRAP;
 352                 CHK_DEBUGGER_TRAP_MAYBE();
 353                 /* Check if this is a single step in kernel space */
 354                 if (kernel_mode_regs(fp))
 355                         goto traps_done;
 356                 else
 357                         break;
 358         /* 0x11 - Trace Buffer Full, handled here */
 359         case VEC_OVFLOW:
 360                 info.si_code = TRAP_TRACEFLOW;
 361                 sig = SIGTRAP;
 362                 strerror = KERN_NOTICE EXC_0x11(KERN_NOTICE);
 363                 CHK_DEBUGGER_TRAP_MAYBE();
 364                 break;
 365         /* 0x12 - Reserved, Caught by default */
 366         /* 0x13 - Reserved, Caught by default */
 367         /* 0x14 - Reserved, Caught by default */
 368         /* 0x15 - Reserved, Caught by default */
 369         /* 0x16 - Reserved, Caught by default */
 370         /* 0x17 - Reserved, Caught by default */
 371         /* 0x18 - Reserved, Caught by default */
 372         /* 0x19 - Reserved, Caught by default */
 373         /* 0x1A - Reserved, Caught by default */
 374         /* 0x1B - Reserved, Caught by default */
 375         /* 0x1C - Reserved, Caught by default */
 376         /* 0x1D - Reserved, Caught by default */
 377         /* 0x1E - Reserved, Caught by default */
 378         /* 0x1F - Reserved, Caught by default */
 379         /* 0x20 - Reserved, Caught by default */
 380         /* 0x21 - Undefined Instruction, handled here */
 381         case VEC_UNDEF_I:
 382 #ifdef CONFIG_BUG
 383                 if (kernel_mode_regs(fp)) {
 384                         switch (report_bug(fp->pc, fp)) {
 385                         case BUG_TRAP_TYPE_NONE:
 386                                 break;
 387                         case BUG_TRAP_TYPE_WARN:
 388                                 dump_bfin_trace_buffer();
 389                                 fp->pc += 2;
 390                                 goto traps_done;
 391                         case BUG_TRAP_TYPE_BUG:
 392                                 /* call to panic() will dump trace, and it is
 393                                  * off at this point, so it won't be clobbered
 394                                  */
 395                                 panic("BUG()");
 396                         }
 397                 }
 398 #endif
 399                 info.si_code = ILL_ILLOPC;
 400                 sig = SIGILL;
 401                 strerror = KERN_NOTICE EXC_0x21(KERN_NOTICE);
 402                 CHK_DEBUGGER_TRAP_MAYBE();
 403                 break;
 404         /* 0x22 - Illegal Instruction Combination, handled here */
 405         case VEC_ILGAL_I:
 406                 info.si_code = ILL_ILLPARAOP;
 407                 sig = SIGILL;
 408                 strerror = KERN_NOTICE EXC_0x22(KERN_NOTICE);
 409                 CHK_DEBUGGER_TRAP_MAYBE();
 410                 break;
 411         /* 0x23 - Data CPLB protection violation, handled here */
 412         case VEC_CPLB_VL:
 413                 info.si_code = ILL_CPLB_VI;
 414                 sig = SIGSEGV;
 415                 strerror = KERN_NOTICE EXC_0x23(KERN_NOTICE);
 416                 CHK_DEBUGGER_TRAP_MAYBE();
 417                 break;
 418         /* 0x24 - Data access misaligned, handled here */
 419         case VEC_MISALI_D:
 420                 info.si_code = BUS_ADRALN;
 421                 sig = SIGBUS;
 422                 strerror = KERN_NOTICE EXC_0x24(KERN_NOTICE);
 423                 CHK_DEBUGGER_TRAP_MAYBE();
 424                 break;
 425         /* 0x25 - Unrecoverable Event, handled here */
 426         case VEC_UNCOV:
 427                 info.si_code = ILL_ILLEXCPT;
 428                 sig = SIGILL;
 429                 strerror = KERN_NOTICE EXC_0x25(KERN_NOTICE);
 430                 CHK_DEBUGGER_TRAP_MAYBE();
 431                 break;
 432         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 433                 error case is handled here */
 434         case VEC_CPLB_M:
 435                 info.si_code = BUS_ADRALN;
 436                 sig = SIGBUS;
 437                 strerror = KERN_NOTICE EXC_0x26(KERN_NOTICE);
 438                 break;
 439         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 440         case VEC_CPLB_MHIT:
 441                 info.si_code = ILL_CPLB_MULHIT;
 442                 sig = SIGSEGV;
 443 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 444                 if (cpu_pda[cpu].dcplb_fault_addr < FIXED_CODE_START)
 445                         strerror = KERN_NOTICE "NULL pointer access\n";
 446                 else
 447 #endif
 448                         strerror = KERN_NOTICE EXC_0x27(KERN_NOTICE);
 449                 CHK_DEBUGGER_TRAP_MAYBE();
 450                 break;
 451         /* 0x28 - Emulation Watchpoint, handled here */
 452         case VEC_WATCH:
 453                 info.si_code = TRAP_WATCHPT;
 454                 sig = SIGTRAP;
 455                 pr_debug(EXC_0x28(KERN_DEBUG));
 456                 CHK_DEBUGGER_TRAP_MAYBE();
 457                 /* Check if this is a watchpoint in kernel space */
 458                 if (kernel_mode_regs(fp))
 459                         goto traps_done;
 460                 else
 461                         break;
 462 #ifdef CONFIG_BF535
 463         /* 0x29 - Instruction fetch access error (535 only) */
 464         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 465                 info.si_code = BUS_OPFETCH;
 466                 sig = SIGBUS;
 467                 strerror = KERN_NOTICE "BF535: VEC_ISTRU_VL\n";
 468                 CHK_DEBUGGER_TRAP_MAYBE();
 469                 break;
 470 #else
 471         /* 0x29 - Reserved, Caught by default */
 472 #endif
 473         /* 0x2A - Instruction fetch misaligned, handled here */
 474         case VEC_MISALI_I:
 475                 info.si_code = BUS_ADRALN;
 476                 sig = SIGBUS;
 477                 strerror = KERN_NOTICE EXC_0x2A(KERN_NOTICE);
 478                 CHK_DEBUGGER_TRAP_MAYBE();
 479                 break;
 480         /* 0x2B - Instruction CPLB protection violation, handled here */
 481         case VEC_CPLB_I_VL:
 482                 info.si_code = ILL_CPLB_VI;
 483                 sig = SIGBUS;
 484                 strerror = KERN_NOTICE EXC_0x2B(KERN_NOTICE);
 485                 CHK_DEBUGGER_TRAP_MAYBE();
 486                 break;
 487         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 488         case VEC_CPLB_I_M:
 489                 info.si_code = ILL_CPLB_MISS;
 490                 sig = SIGBUS;
 491                 strerror = KERN_NOTICE EXC_0x2C(KERN_NOTICE);
 492                 break;
 493         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 494         case VEC_CPLB_I_MHIT:
 495                 info.si_code = ILL_CPLB_MULHIT;
 496                 sig = SIGSEGV;
 497 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 498                 if (cpu_pda[cpu].icplb_fault_addr < FIXED_CODE_START)
 499                         strerror = KERN_NOTICE "Jump to NULL address\n";
 500                 else
 501 #endif
 502                         strerror = KERN_NOTICE EXC_0x2D(KERN_NOTICE);
 503                 CHK_DEBUGGER_TRAP_MAYBE();
 504                 break;
 505         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 506         case VEC_ILL_RES:
 507                 info.si_code = ILL_PRVOPC;
 508                 sig = SIGILL;
 509                 strerror = KERN_NOTICE EXC_0x2E(KERN_NOTICE);
 510                 CHK_DEBUGGER_TRAP_MAYBE();
 511                 break;
 512         /* 0x2F - Reserved, Caught by default */
 513         /* 0x30 - Reserved, Caught by default */
 514         /* 0x31 - Reserved, Caught by default */
 515         /* 0x32 - Reserved, Caught by default */
 516         /* 0x33 - Reserved, Caught by default */
 517         /* 0x34 - Reserved, Caught by default */
 518         /* 0x35 - Reserved, Caught by default */
 519         /* 0x36 - Reserved, Caught by default */
 520         /* 0x37 - Reserved, Caught by default */
 521         /* 0x38 - Reserved, Caught by default */
 522         /* 0x39 - Reserved, Caught by default */
 523         /* 0x3A - Reserved, Caught by default */
 524         /* 0x3B - Reserved, Caught by default */
 525         /* 0x3C - Reserved, Caught by default */
 526         /* 0x3D - Reserved, Caught by default */
 527         /* 0x3E - Reserved, Caught by default */
 528         /* 0x3F - Reserved, Caught by default */
 529         case VEC_HWERR:
 530                 info.si_code = BUS_ADRALN;
 531                 sig = SIGBUS;
 532                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 533                 /* System MMR Error */
 534                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 535                         info.si_code = BUS_ADRALN;
 536                         sig = SIGBUS;
 537                         strerror = KERN_NOTICE HWC_x2(KERN_NOTICE);
 538                         break;
 539                 /* External Memory Addressing Error */
 540                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 541                         info.si_code = BUS_ADRERR;
 542                         sig = SIGBUS;
 543                         strerror = KERN_NOTICE HWC_x3(KERN_NOTICE);
 544                         break;
 545                 /* Performance Monitor Overflow */
 546                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 547                         strerror = KERN_NOTICE HWC_x12(KERN_NOTICE);
 548                         break;
 549                 /* RAISE 5 instruction */
 550                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 551                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 552                         break;
 553                 default:        /* Reserved */
 554                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 555                         break;
 556                 }
 557                 CHK_DEBUGGER_TRAP_MAYBE();
 558                 break;
 559         /*
 560          * We should be handling all known exception types above,
 561          * if we get here we hit a reserved one, so panic
 562          */
 563         default:
 564                 info.si_code = ILL_ILLPARAOP;
 565                 sig = SIGILL;
 566                 verbose_printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 567                         (fp->seqstat & SEQSTAT_EXCAUSE));
 568                 CHK_DEBUGGER_TRAP_MAYBE();
 569                 break;
 570         }
 571
 572         BUG_ON(sig == 0);
 573
 574         /* If the fault was caused by a kernel thread, or interrupt handler
 575          * we will kernel panic, so the system reboots.
 576          */
 577         if (kernel_mode_regs(fp) || (current && !current->mm)) {
 578                 console_verbose();
 579                 oops_in_progress = 1;
 580         }
 581
 582         if (sig != SIGTRAP) {
 583                 if (strerror)
 584                         verbose_printk(strerror);
 585
 586                 dump_bfin_process(fp);
 587                 dump_bfin_mem(fp);
 588                 show_regs(fp);
 589
 590                 /* Print out the trace buffer if it makes sense */
 591 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 592                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 593                         verbose_printk(KERN_NOTICE "No trace since you do not have "
 594                                "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n\n");
 595                 else
 596 #endif
 597                         dump_bfin_trace_buffer();
 598
 599                 if (oops_in_progress) {
 600                         /* Dump the current kernel stack */
 601                         verbose_printk(KERN_NOTICE "Kernel Stack\n");
 602                         show_stack(current, NULL);
 603                         print_modules();
 604 #ifndef CONFIG_ACCESS_CHECK
 605                         verbose_printk(KERN_EMERG "Please turn on "
 606                                "CONFIG_ACCESS_CHECK\n");
 607 #endif
 608                         panic("Kernel exception");
 609                 } else {
 610 #ifdef CONFIG_DEBUG_VERBOSE
 611                         unsigned long *stack;
 612                         /* Dump the user space stack */
 613                         stack = (unsigned long *)rdusp();
 614                         verbose_printk(KERN_NOTICE "Userspace Stack\n");
 615                         show_stack(NULL, stack);
 616 #endif
 617                 }
 618         }
 619
 620 #ifdef CONFIG_IPIPE
 621         if (!ipipe_trap_notify(fp->seqstat & 0x3f, fp))
 622 #endif
 623         {
 624                 info.si_signo = sig;
 625                 info.si_errno = 0;
 626                 info.si_addr = (void __user *)fp->pc;
 627                 force_sig_info(sig, &info, current);
 628         }
 629
 630         if ((ANOMALY_05000461 && trapnr == VEC_HWERR && !access_ok(VERIFY_READ, fp->pc, 8)) ||
 631             (ANOMALY_05000281 && trapnr == VEC_HWERR) ||
 632             (ANOMALY_05000189 && (trapnr == VEC_CPLB_I_VL || trapnr == VEC_CPLB_VL)))
 633                 fp->pc = SAFE_USER_INSTRUCTION;
 634
 635  traps_done:
 636         trace_buffer_restore(j);
 637 }
 638
 639 /* Typical exception handling routines  */
 640
 641 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 642
 643 /*
 644  * Similar to get_user, do some address checking, then dereference
 645  * Return true on sucess, false on bad address
 646  */
 647 static bool get_instruction(unsigned short *val, unsigned short *address)
 648 {
 649         unsigned long addr = (unsigned long)address;
 650
 651         /* Check for odd addresses */
 652         if (addr & 0x1)
 653                 return false;
 654
 655         /* MMR region will never have instructions */
 656         if (addr >= SYSMMR_BASE)
 657                 return false;
 658
 659         switch (bfin_mem_access_type(addr, 2)) {
 660                 case BFIN_MEM_ACCESS_CORE:
 661                 case BFIN_MEM_ACCESS_CORE_ONLY:
 662                         *val = *address;
 663                         return true;
 664                 case BFIN_MEM_ACCESS_DMA:
 665                         dma_memcpy(val, address, 2);
 666                         return true;
 667                 case BFIN_MEM_ACCESS_ITEST:
 668                         isram_memcpy(val, address, 2);
 669                         return true;
 670                 default: /* invalid access */
 671                         return false;
 672         }
 673 }
 674
 675 /*
 676  * decode the instruction if we are printing out the trace, as it
 677  * makes things easier to follow, without running it through objdump
 678  * These are the normal instructions which cause change of flow, which
 679  * would be at the source of the trace buffer
 680  */
 681 #if defined(CONFIG_DEBUG_VERBOSE) && defined(CONFIG_DEBUG_BFIN_HWTRACE_ON)
 682 static void decode_instruction(unsigned short *address)
 683 {
 684         unsigned short opcode;
 685
 686         if (get_instruction(&opcode, address)) {
 687                 if (opcode == 0x0010)
 688                         verbose_printk("RTS");
 689                 else if (opcode == 0x0011)
 690                         verbose_printk("RTI");
 691                 else if (opcode == 0x0012)
 692                         verbose_printk("RTX");
 693                 else if (opcode == 0x0013)
 694                         verbose_printk("RTN");
 695                 else if (opcode == 0x0014)
 696                         verbose_printk("RTE");
 697                 else if (opcode == 0x0025)
 698                         verbose_printk("EMUEXCPT");
 699                 else if (opcode == 0x0040 && opcode <= 0x0047)
 700                         verbose_printk("STI R%i", opcode & 7);
 701                 else if (opcode >= 0x0050 && opcode <= 0x0057)
 702                         verbose_printk("JUMP (P%i)", opcode & 7);
 703                 else if (opcode >= 0x0060 && opcode <= 0x0067)
 704                         verbose_printk("CALL (P%i)", opcode & 7);
 705                 else if (opcode >= 0x0070 && opcode <= 0x0077)
 706                         verbose_printk("CALL (PC+P%i)", opcode & 7);
 707                 else if (opcode >= 0x0080 && opcode <= 0x0087)
 708                         verbose_printk("JUMP (PC+P%i)", opcode & 7);
 709                 else if (opcode >= 0x0090 && opcode <= 0x009F)
 710                         verbose_printk("RAISE 0x%x", opcode & 0xF);
 711                 else if (opcode >= 0x00A0 && opcode <= 0x00AF)
 712                         verbose_printk("EXCPT 0x%x", opcode & 0xF);
 713                 else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
 714                         verbose_printk("IF !CC JUMP");
 715                 else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
 716                         verbose_printk("IF CC JUMP");
 717                 else if (opcode >= 0x2000 && opcode <= 0x2fff)
 718                         verbose_printk("JUMP.S");
 719                 else if (opcode >= 0xe080 && opcode <= 0xe0ff)
 720                         verbose_printk("LSETUP");
 721                 else if (opcode >= 0xe200 && opcode <= 0xe2ff)
 722                         verbose_printk("JUMP.L");
 723                 else if (opcode >= 0xe300 && opcode <= 0xe3ff)
 724                         verbose_printk("CALL pcrel");
 725                 else
 726                         verbose_printk("0x%04x", opcode);
 727         }
 728
 729 }
 730 #endif
 731
 732 void dump_bfin_trace_buffer(void)
 733 {
 734 #ifdef CONFIG_DEBUG_VERBOSE
 735 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 736         int tflags, i = 0;
 737         char buf[150];
 738         unsigned short *addr;
 739 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 740         int j, index;
 741 #endif
 742
 743         trace_buffer_save(tflags);
 744
 745         printk(KERN_NOTICE "Hardware Trace:\n");
 746
 747 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 748         printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
 749 #endif
 750
 751         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 752                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 753                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 754                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 755                         addr = (unsigned short *)bfin_read_TBUF();
 756                         decode_address(buf, (unsigned long)addr);
 757                         printk(KERN_NOTICE "     Source : %s ", buf);
 758                         decode_instruction(addr);
 759                         printk("\n");
 760                 }
 761         }
 762
 763 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 764         if (trace_buff_offset)
 765                 index = trace_buff_offset / 4;
 766         else
 767                 index = EXPAND_LEN;
 768
 769         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 770         while (j) {
 771                 decode_address(buf, software_trace_buff[index]);
 772                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 773                 index -= 1;
 774                 if (index < 0 )
 775                         index = EXPAND_LEN;
 776                 decode_address(buf, software_trace_buff[index]);
 777                 printk(KERN_NOTICE "     Source : %s ", buf);
 778                 decode_instruction((unsigned short *)software_trace_buff[index]);
 779                 printk("\n");
 780                 index -= 1;
 781                 if (index < 0)
 782                         index = EXPAND_LEN;
 783                 j--;
 784                 i++;
 785         }
 786 #endif
 787
 788         trace_buffer_restore(tflags);
 789 #endif
 790 #endif
 791 }
 792 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 793
 794 #ifdef CONFIG_BUG
 795 int is_valid_bugaddr(unsigned long addr)
 796 {
 797         unsigned short opcode;
 798
 799         if (!get_instruction(&opcode, (unsigned short *)addr))
 800                 return 0;
 801
 802         return opcode == BFIN_BUG_OPCODE;
 803 }
 804 #endif
 805
 806 /*
 807  * Checks to see if the address pointed to is either a
 808  * 16-bit CALL instruction, or a 32-bit CALL instruction
 809  */
 810 static bool is_bfin_call(unsigned short *addr)
 811 {
 812         unsigned short opcode = 0, *ins_addr;
 813         ins_addr = (unsigned short *)addr;
 814
 815         if (!get_instruction(&opcode, ins_addr))
 816                 return false;
 817
 818         if ((opcode >= 0x0060 && opcode <= 0x0067) ||
 819             (opcode >= 0x0070 && opcode <= 0x0077))
 820                 return true;
 821
 822         ins_addr--;
 823         if (!get_instruction(&opcode, ins_addr))
 824                 return false;
 825
 826         if (opcode >= 0xE300 && opcode <= 0xE3FF)
 827                 return true;
 828
 829         return false;
 830
 831 }
 832
 833 void show_stack(struct task_struct *task, unsigned long *stack)
 834 {
 835 #ifdef CONFIG_PRINTK
 836         unsigned int *addr, *endstack, *fp = 0, *frame;
 837         unsigned short *ins_addr;
 838         char buf[150];
 839         unsigned int i, j, ret_addr, frame_no = 0;
 840
 841         /*
 842          * If we have been passed a specific stack, use that one otherwise
 843          *    if we have been passed a task structure, use that, otherwise
 844          *    use the stack of where the variable "stack" exists
 845          */
 846
 847         if (stack == NULL) {
 848                 if (task) {
 849                         /* We know this is a kernel stack, so this is the start/end */
 850                         stack = (unsigned long *)task->thread.ksp;
 851                         endstack = (unsigned int *)(((unsigned int)(stack) & ~(THREAD_SIZE - 1)) + THREAD_SIZE);
 852                 } else {
 853                         /* print out the existing stack info */
 854                         stack = (unsigned long *)&stack;
 855                         endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 856                 }
 857         } else
 858                 endstack = (unsigned int *)PAGE_ALIGN((unsigned int)stack);
 859
 860         printk(KERN_NOTICE "Stack info:\n");
 861         decode_address(buf, (unsigned int)stack);
 862         printk(KERN_NOTICE " SP: [0x%p] %s\n", stack, buf);
 863
 864         if (!access_ok(VERIFY_READ, stack, (unsigned int)endstack - (unsigned int)stack)) {
 865                 printk(KERN_NOTICE "Invalid stack pointer\n");
 866                 return;
 867         }
 868
 869         /* First thing is to look for a frame pointer */
 870         for (addr = (unsigned int *)((unsigned int)stack & ~0xF); addr < endstack; addr++) {
 871                 if (*addr & 0x1)
 872                         continue;
 873                 ins_addr = (unsigned short *)*addr;
 874                 ins_addr--;
 875                 if (is_bfin_call(ins_addr))
 876                         fp = addr - 1;
 877
 878                 if (fp) {
 879                         /* Let's check to see if it is a frame pointer */
 880                         while (fp >= (addr - 1) && fp < endstack
 881                                && fp && ((unsigned int) fp & 0x3) == 0)
 882                                 fp = (unsigned int *)*fp;
 883                         if (fp == 0 || fp == endstack) {
 884                                 fp = addr - 1;
 885                                 break;
 886                         }
 887                         fp = 0;
 888                 }
 889         }
 890         if (fp) {
 891                 frame = fp;
 892                 printk(KERN_NOTICE " FP: (0x%p)\n", fp);
 893         } else
 894                 frame = 0;
 895
 896         /*
 897          * Now that we think we know where things are, we
 898          * walk the stack again, this time printing things out
 899          * incase there is no frame pointer, we still look for
 900          * valid return addresses
 901          */
 902
 903         /* First time print out data, next time, print out symbols */
 904         for (j = 0; j <= 1; j++) {
 905                 if (j)
 906                         printk(KERN_NOTICE "Return addresses in stack:\n");
 907                 else
 908                         printk(KERN_NOTICE " Memory from 0x%08lx to %p", ((long unsigned int)stack & ~0xF), endstack);
 909
 910                 fp = frame;
 911                 frame_no = 0;
 912
 913                 for (addr = (unsigned int *)((unsigned int)stack & ~0xF), i = 0;
 914                      addr < endstack; addr++, i++) {
 915
 916                         ret_addr = 0;
 917                         if (!j && i % 8 == 0)
 918                                 printk(KERN_NOTICE "%p:",addr);
 919
 920                         /* if it is an odd address, or zero, just skip it */
 921                         if (*addr & 0x1 || !*addr)
 922                                 goto print;
 923
 924                         ins_addr = (unsigned short *)*addr;
 925
 926                         /* Go back one instruction, and see if it is a CALL */
 927                         ins_addr--;
 928                         ret_addr = is_bfin_call(ins_addr);
 929  print:
 930                         if (!j && stack == (unsigned long *)addr)
 931                                 printk("[%08x]", *addr);
 932                         else if (ret_addr)
 933                                 if (j) {
 934                                         decode_address(buf, (unsigned int)*addr);
 935                                         if (frame == addr) {
 936                                                 printk(KERN_NOTICE "   frame %2i : %s\n", frame_no, buf);
 937                                                 continue;
 938                                         }
 939                                         printk(KERN_NOTICE "    address : %s\n", buf);
 940                                 } else
 941                                         printk("<%08x>", *addr);
 942                         else if (fp == addr) {
 943                                 if (j)
 944                                         frame = addr+1;
 945                                 else
 946                                         printk("(%08x)", *addr);
 947
 948                                 fp = (unsigned int *)*addr;
 949                                 frame_no++;
 950
 951                         } else if (!j)
 952                                 printk(" %08x ", *addr);
 953                 }
 954                 if (!j)
 955                         printk("\n");
 956         }
 957 #endif
 958 }
 959 EXPORT_SYMBOL(show_stack);
 960
 961 void dump_stack(void)
 962 {
 963         unsigned long stack;
 964 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 965         int tflags;
 966 #endif
 967         trace_buffer_save(tflags);
 968         dump_bfin_trace_buffer();
 969         show_stack(current, &stack);
 970         trace_buffer_restore(tflags);
 971 }
 972 EXPORT_SYMBOL(dump_stack);
 973
 974 void dump_bfin_process(struct pt_regs *fp)
 975 {
 976 #ifdef CONFIG_DEBUG_VERBOSE
 977         /* We should be able to look at fp->ipend, but we don't push it on the
 978          * stack all the time, so do this until we fix that */
 979         unsigned int context = bfin_read_IPEND();
 980
 981         if (oops_in_progress)
 982                 verbose_printk(KERN_EMERG "Kernel OOPS in progress\n");
 983
 984         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 985                 verbose_printk(KERN_NOTICE "HW Error context\n");
 986         else if (context & 0x0020)
 987                 verbose_printk(KERN_NOTICE "Deferred Exception context\n");
 988         else if (context & 0x3FC0)
 989                 verbose_printk(KERN_NOTICE "Interrupt context\n");
 990         else if (context & 0x4000)
 991                 verbose_printk(KERN_NOTICE "Deferred Interrupt context\n");
 992         else if (context & 0x8000)
 993                 verbose_printk(KERN_NOTICE "Kernel process context\n");
 994
 995         /* Because we are crashing, and pointers could be bad, we check things
 996          * pretty closely before we use them
 997          */
 998         if ((unsigned long)current >= FIXED_CODE_START &&
 999             !((unsigned long)current & 0x3) && current->pid) {
1000                 verbose_printk(KERN_NOTICE "CURRENT PROCESS:\n");
1001                 if (current->comm >= (char *)FIXED_CODE_START)
1002                         verbose_printk(KERN_NOTICE "COMM=%s PID=%d\n",
1003                                 current->comm, current->pid);
1004                 else
1005                         verbose_printk(KERN_NOTICE "COMM= invalid\n");
1006
1007                 printk(KERN_NOTICE "CPU = %d\n", current_thread_info()->cpu);
1008                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
1009                         verbose_printk(KERN_NOTICE
1010                                 "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
1011                                 " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n\n",
1012                                 (void *)current->mm->start_code,
1013                                 (void *)current->mm->end_code,
1014                                 (void *)current->mm->start_data,
1015                                 (void *)current->mm->end_data,
1016                                 (void *)current->mm->end_data,
1017                                 (void *)current->mm->brk,
1018                                 (void *)current->mm->start_stack);
1019                 else
1020                         verbose_printk(KERN_NOTICE "invalid mm\n");
1021         } else
1022                 verbose_printk(KERN_NOTICE
1023                                "No Valid process in current context\n");
1024 #endif
1025 }
1026
1027 void dump_bfin_mem(struct pt_regs *fp)
1028 {
1029 #ifdef CONFIG_DEBUG_VERBOSE
1030         unsigned short *addr, *erraddr, val = 0, err = 0;
1031         char sti = 0, buf[6];
1032
1033         erraddr = (void *)fp->pc;
1034
1035         verbose_printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
1036
1037         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
1038              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
1039              addr++) {
1040                 if (!((unsigned long)addr & 0xF))
1041                         verbose_printk(KERN_NOTICE "0x%p: ", addr);
1042
1043                 if (!get_instruction(&val, addr)) {
1044                                 val = 0;
1045                                 sprintf(buf, "????");
1046                 } else
1047                         sprintf(buf, "%04x", val);
1048
1049                 if (addr == erraddr) {
1050                         verbose_printk("[%s]", buf);
1051                         err = val;
1052                 } else
1053                         verbose_printk(" %s ", buf);
1054
1055                 /* Do any previous instructions turn on interrupts? */
1056                 if (addr <= erraddr &&                          /* in the past */
1057                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
1058                       val == 0x017b))                           /* [SP++] = RETI */
1059                         sti = 1;
1060         }
1061
1062         verbose_printk("\n");
1063
1064         /* Hardware error interrupts can be deferred */
1065         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
1066             oops_in_progress)){
1067                 verbose_printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
1068 #ifndef CONFIG_DEBUG_HWERR
1069                 verbose_printk(KERN_NOTICE
1070 "The remaining message may be meaningless\n"
1071 "You should enable CONFIG_DEBUG_HWERR to get a better idea where it came from\n");
1072 #else
1073                 /* If we are handling only one peripheral interrupt
1074                  * and current mm and pid are valid, and the last error
1075                  * was in that user space process's text area
1076                  * print it out - because that is where the problem exists
1077                  */
1078                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
1079                      (current->pid && current->mm)) {
1080                         /* And the last RETI points to the current userspace context */
1081                         if ((fp + 1)->pc >= current->mm->start_code &&
1082                             (fp + 1)->pc <= current->mm->end_code) {
1083                                 verbose_printk(KERN_NOTICE "It might be better to look around here : \n");
1084                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1085                                 show_regs(fp + 1);
1086                                 verbose_printk(KERN_NOTICE "-------------------------------------------\n");
1087                         }
1088                 }
1089 #endif
1090         }
1091 #endif
1092 }
1093
1094 void show_regs(struct pt_regs *fp)
1095 {
1096 #ifdef CONFIG_DEBUG_VERBOSE
1097         char buf [150];
1098         struct irqaction *action;
1099         unsigned int i;
1100         unsigned long flags = 0;
1101         unsigned int cpu = raw_smp_processor_id();
1102         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
1103
1104         verbose_printk(KERN_NOTICE "\n");
1105         if (CPUID != bfin_cpuid())
1106                 verbose_printk(KERN_NOTICE "Compiled for cpu family 0x%04x (Rev %d), "
1107                         "but running on:0x%04x (Rev %d)\n",
1108                         CPUID, bfin_compiled_revid(), bfin_cpuid(), bfin_revid());
1109
1110         verbose_printk(KERN_NOTICE "ADSP-%s-0.%d",
1111                 CPU, bfin_compiled_revid());
1112
1113         if (bfin_compiled_revid() !=  bfin_revid())
1114                 verbose_printk("(Detected 0.%d)", bfin_revid());
1115
1116         verbose_printk(" %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n",
1117                 get_cclk()/1000000, get_sclk()/1000000,
1118 #ifdef CONFIG_MPU
1119                 "mpu on"
1120 #else
1121                 "mpu off"
1122 #endif
1123                 );
1124
1125         verbose_printk(KERN_NOTICE "%s", linux_banner);
1126
1127         verbose_printk(KERN_NOTICE "\nSEQUENCER STATUS:\t\t%s\n", print_tainted());
1128         verbose_printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  IMASK: %04lx  SYSCFG: %04lx\n",
1129                 (long)fp->seqstat, fp->ipend, cpu_pda[raw_smp_processor_id()].ex_imask, fp->syscfg);
1130         if (fp->ipend & EVT_IRPTEN)
1131                 verbose_printk(KERN_NOTICE "  Global Interrupts Disabled (IPEND[4])\n");
1132         if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG13 | EVT_IVG12 | EVT_IVG11 |
1133                         EVT_IVG10 | EVT_IVG9 | EVT_IVG8 | EVT_IVG7 | EVT_IVTMR)))
1134                 verbose_printk(KERN_NOTICE "  Peripheral interrupts masked off\n");
1135         if (!(cpu_pda[raw_smp_processor_id()].ex_imask & (EVT_IVG15 | EVT_IVG14)))
1136                 verbose_printk(KERN_NOTICE "  Kernel interrupts masked off\n");
1137         if ((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR) {
1138                 verbose_printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
1139                         (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
1140 #ifdef EBIU_ERRMST
1141                 /* If the error was from the EBIU, print it out */
1142                 if (bfin_read_EBIU_ERRMST() & CORE_ERROR) {
1143                         verbose_printk(KERN_NOTICE "  EBIU Error Reason  : 0x%04x\n",
1144                                 bfin_read_EBIU_ERRMST());
1145                         verbose_printk(KERN_NOTICE "  EBIU Error Address : 0x%08x\n",
1146                                 bfin_read_EBIU_ERRADD());
1147                 }
1148 #endif
1149         }
1150         verbose_printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
1151                 fp->seqstat & SEQSTAT_EXCAUSE);
1152         for (i = 2; i <= 15 ; i++) {
1153                 if (fp->ipend & (1 << i)) {
1154                         if (i != 4) {
1155                                 decode_address(buf, bfin_read32(EVT0 + 4*i));
1156                                 verbose_printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
1157                         } else
1158                                 verbose_printk(KERN_NOTICE "  interrupts disabled\n");
1159                 }
1160         }
1161
1162         /* if no interrupts are going off, don't print this out */
1163         if (fp->ipend & ~0x3F) {
1164                 for (i = 0; i < (NR_IRQS - 1); i++) {
1165                         if (!in_atomic)
1166                                 spin_lock_irqsave(&irq_desc[i].lock, flags);
1167
1168                         action = irq_desc[i].action;
1169                         if (!action)
1170                                 goto unlock;
1171
1172                         decode_address(buf, (unsigned int)action->handler);
1173                         verbose_printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
1174                         for (action = action->next; action; action = action->next) {
1175                                 decode_address(buf, (unsigned int)action->handler);
1176                                 verbose_printk(", %s", buf);
1177                         }
1178                         verbose_printk("\n");
1179 unlock:
1180                         if (!in_atomic)
1181                                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
1182                 }
1183         }
1184
1185         decode_address(buf, fp->rete);
1186         verbose_printk(KERN_NOTICE " RETE: %s\n", buf);
1187         decode_address(buf, fp->retn);
1188         verbose_printk(KERN_NOTICE " RETN: %s\n", buf);
1189         decode_address(buf, fp->retx);
1190         verbose_printk(KERN_NOTICE " RETX: %s\n", buf);
1191         decode_address(buf, fp->rets);
1192         verbose_printk(KERN_NOTICE " RETS: %s\n", buf);
1193         decode_address(buf, fp->pc);
1194         verbose_printk(KERN_NOTICE " PC  : %s\n", buf);
1195
1196         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
1197             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
1198                 decode_address(buf, cpu_pda[cpu].dcplb_fault_addr);
1199                 verbose_printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
1200                 decode_address(buf, cpu_pda[cpu].icplb_fault_addr);
1201                 verbose_printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
1202         }
1203
1204         verbose_printk(KERN_NOTICE "PROCESSOR STATE:\n");
1205         verbose_printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
1206                 fp->r0, fp->r1, fp->r2, fp->r3);
1207         verbose_printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
1208                 fp->r4, fp->r5, fp->r6, fp->r7);
1209         verbose_printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
1210                 fp->p0, fp->p1, fp->p2, fp->p3);
1211         verbose_printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
1212                 fp->p4, fp->p5, fp->fp, (long)fp);
1213         verbose_printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
1214                 fp->lb0, fp->lt0, fp->lc0);
1215         verbose_printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
1216                 fp->lb1, fp->lt1, fp->lc1);
1217         verbose_printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
1218                 fp->b0, fp->l0, fp->m0, fp->i0);
1219         verbose_printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
1220                 fp->b1, fp->l1, fp->m1, fp->i1);
1221         verbose_printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
1222                 fp->b2, fp->l2, fp->m2, fp->i2);
1223         verbose_printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
1224                 fp->b3, fp->l3, fp->m3, fp->i3);
1225         verbose_printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
1226                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
1227
1228         verbose_printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
1229                 rdusp(), fp->astat);
1230
1231         verbose_printk(KERN_NOTICE "\n");
1232 #endif
1233 }
1234
1235 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
1236 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
1237 #endif
1238
1239 static DEFINE_SPINLOCK(bfin_spinlock_lock);
1240
1241 asmlinkage int sys_bfin_spinlock(int *p)
1242 {
1243         int ret, tmp = 0;
1244
1245         spin_lock(&bfin_spinlock_lock); /* This would also hold kernel preemption. */
1246         ret = get_user(tmp, p);
1247         if (likely(ret == 0)) {
1248                 if (unlikely(tmp))
1249                         ret = 1;
1250                 else
1251                         put_user(1, p);
1252         }
1253         spin_unlock(&bfin_spinlock_lock);
1254         return ret;
1255 }
1256
1257 int bfin_request_exception(unsigned int exception, void (*handler)(void))
1258 {
1259         void (*curr_handler)(void);
1260
1261         if (exception > 0x3F)
1262                 return -EINVAL;
1263
1264         curr_handler = ex_table[exception];
1265
1266         if (curr_handler != ex_replaceable)
1267                 return -EBUSY;
1268
1269         ex_table[exception] = handler;
1270
1271         return 0;
1272 }
1273 EXPORT_SYMBOL(bfin_request_exception);
1274
1275 int bfin_free_exception(unsigned int exception, void (*handler)(void))
1276 {
1277         void (*curr_handler)(void);
1278
1279         if (exception > 0x3F)
1280                 return -EINVAL;
1281
1282         curr_handler = ex_table[exception];
1283
1284         if (curr_handler != handler)
1285                 return -EBUSY;
1286
1287         ex_table[exception] = ex_replaceable;
1288
1289         return 0;
1290 }
1291 EXPORT_SYMBOL(bfin_free_exception);
1292
1293 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
1294 {
1295         switch (cplb_panic) {
1296         case CPLB_NO_UNLOCKED:
1297                 printk(KERN_EMERG "All CPLBs are locked\n");
1298                 break;
1299         case CPLB_PROT_VIOL:
1300                 return;
1301         case CPLB_NO_ADDR_MATCH:
1302                 return;
1303         case CPLB_UNKNOWN_ERR:
1304                 printk(KERN_EMERG "Unknown CPLB Exception\n");
1305                 break;
1306         }
1307
1308         oops_in_progress = 1;
1309
1310         dump_bfin_process(fp);
1311         dump_bfin_mem(fp);
1312         show_regs(fp);
1313         dump_stack();
1314         panic("Unrecoverable event");
1315 }