arch/blackfin/kernel/traps.c

   1 /*
   2  * File:         arch/blackfin/kernel/traps.c
   3  * Based on:
   4  * Author:       Hamish Macdonald
   5  *
   6  * Created:
   7  * Description:  uses S/W interrupt 15 for the system calls
   8  *
   9  * Modified:
  10  *               Copyright 2004-2006 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 #include <linux/uaccess.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/module.h>
  33 #include <linux/kallsyms.h>
  34 #include <linux/fs.h>
  35 #include <asm/traps.h>
  36 #include <asm/cacheflush.h>
  37 #include <asm/blackfin.h>
  38 #include <asm/irq_handler.h>
  39 #include <asm/trace.h>
  40
  41 #ifdef CONFIG_KGDB
  42 # include <linux/debugger.h>
  43 # include <linux/kgdb.h>
  44 #endif
  45
  46 /* Initiate the event table handler */
  47 void __init trap_init(void)
  48 {
  49         CSYNC();
  50         bfin_write_EVT3(trap);
  51         CSYNC();
  52 }
  53
  54 int kstack_depth_to_print = 48;
  55
  56 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
  57 static void printk_address(unsigned long address)
  58 {
  59         struct vm_list_struct *vml;
  60         struct task_struct *p;
  61         struct mm_struct *mm;
  62         unsigned long flags, offset;
  63         unsigned int in_exception = bfin_read_IPEND() & 0x10;
  64
  65 #ifdef CONFIG_KALLSYMS
  66         unsigned long symsize;
  67         const char *symname;
  68         char *modname;
  69         char *delim = ":";
  70         char namebuf[128];
  71
  72         /* look up the address and see if we are in kernel space */
  73         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
  74
  75         if (symname) {
  76                 /* yeah! kernel space! */
  77                 if (!modname)
  78                         modname = delim = "";
  79                 printk("<0x%p> { %s%s%s%s + 0x%lx }",
  80                               (void *)address, delim, modname, delim, symname,
  81                               (unsigned long)offset);
  82                 return;
  83
  84         }
  85 #endif
  86
  87         /* looks like we're off in user-land, so let's walk all the
  88          * mappings of all our processes and see if we can't be a whee
  89          * bit more specific
  90          */
  91         write_lock_irqsave(&tasklist_lock, flags);
  92         for_each_process(p) {
  93                 mm = (in_exception ? p->mm : get_task_mm(p));
  94                 if (!mm)
  95                         continue;
  96
  97                 vml = mm->context.vmlist;
  98                 while (vml) {
  99                         struct vm_area_struct *vma = vml->vma;
 100
 101                         if (address >= vma->vm_start && address < vma->vm_end) {
 102                                 char *name = p->comm;
 103                                 struct file *file = vma->vm_file;
 104                                 if (file) {
 105                                         char _tmpbuf[256];
 106                                         name = d_path(file->f_dentry,
 107                                                       file->f_vfsmnt,
 108                                                       _tmpbuf,
 109                                                       sizeof(_tmpbuf));
 110                                 }
 111
 112                                 /* FLAT does not have its text aligned to the start of
 113                                  * the map while FDPIC ELF does ...
 114                                  */
 115                                 if (current->mm &&
 116                                     (address > current->mm->start_code) &&
 117                                     (address < current->mm->end_code))
 118                                         offset = address - current->mm->start_code;
 119                                 else
 120                                         offset = (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
 121
 122                                 printk("<0x%p> [ %s + 0x%lx ]",
 123                                         (void *)address, name, offset);
 124                                 if (!in_exception)
 125                                         mmput(mm);
 126                                 goto done;
 127                         }
 128
 129                         vml = vml->next;
 130                 }
 131                 if (!in_exception)
 132                         mmput(mm);
 133         }
 134
 135         /* we were unable to find this address anywhere */
 136         printk("[<0x%p>]", (void *)address);
 137
 138 done:
 139         write_unlock_irqrestore(&tasklist_lock, flags);
 140 }
 141 #endif
 142
 143 asmlinkage void double_fault_c(struct pt_regs *fp)
 144 {
 145         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 146         dump_bfin_regs(fp, (void *)fp->retx);
 147         panic("Double Fault - unrecoverable event\n");
 148
 149 }
 150
 151 asmlinkage void trap_c(struct pt_regs *fp)
 152 {
 153 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 154         int j;
 155 #endif
 156         int sig = 0;
 157         siginfo_t info;
 158         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 159
 160 #ifdef CONFIG_KGDB
 161 # define CHK_DEBUGGER_TRAP() \
 162         do { \
 163                 CHK_DEBUGGER(trapnr, sig, info.si_code, fp, ); \
 164         } while (0)
 165 # define CHK_DEBUGGER_TRAP_MAYBE() \
 166         do { \
 167                 if (kgdb_connected) \
 168                         CHK_DEBUGGER_TRAP(); \
 169         } while (0)
 170 #else
 171 # define CHK_DEBUGGER_TRAP() do { } while (0)
 172 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
 173 #endif
 174
 175         trace_buffer_save(j);
 176
 177         /* trap_c() will be called for exceptions. During exceptions
 178          * processing, the pc value should be set with retx value.
 179          * With this change we can cleanup some code in signal.c- TODO
 180          */
 181         fp->orig_pc = fp->retx;
 182         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 183                 trapnr, fp->ipend, fp->pc, fp->retx); */
 184
 185         /* send the appropriate signal to the user program */
 186         switch (trapnr) {
 187
 188         /* This table works in conjuction with the one in ./mach-common/entry.S
 189          * Some exceptions are handled there (in assembly, in exception space)
 190          * Some are handled here, (in C, in interrupt space)
 191          * Some, like CPLB, are handled in both, where the normal path is
 192          * handled in assembly/exception space, and the error path is handled
 193          * here
 194          */
 195
 196         /* 0x00 - Linux Syscall, getting here is an error */
 197         /* 0x01 - userspace gdb breakpoint, handled here */
 198         case VEC_EXCPT01:
 199                 info.si_code = TRAP_ILLTRAP;
 200                 sig = SIGTRAP;
 201                 CHK_DEBUGGER_TRAP_MAYBE();
 202                 /* Check if this is a breakpoint in kernel space */
 203                 if (fp->ipend & 0xffc0)
 204                         return;
 205                 else
 206                         break;
 207 #ifdef CONFIG_KGDB
 208         case VEC_EXCPT02 :               /* gdb connection */
 209                 info.si_code = TRAP_ILLTRAP;
 210                 sig = SIGTRAP;
 211                 CHK_DEBUGGER_TRAP();
 212                 return;
 213 #else
 214         /* 0x02 - User Defined, Caught by default */
 215 #endif
 216         /* 0x03 - User Defined, userspace stack overflow */
 217         case VEC_EXCPT03:
 218                 info.si_code = SEGV_STACKFLOW;
 219                 sig = SIGSEGV;
 220                 printk(KERN_EMERG EXC_0x03);
 221                 CHK_DEBUGGER_TRAP();
 222                 break;
 223         /* 0x04 - User Defined, Caught by default */
 224         /* 0x05 - User Defined, Caught by default */
 225         /* 0x06 - User Defined, Caught by default */
 226         /* 0x07 - User Defined, Caught by default */
 227         /* 0x08 - User Defined, Caught by default */
 228         /* 0x09 - User Defined, Caught by default */
 229         /* 0x0A - User Defined, Caught by default */
 230         /* 0x0B - User Defined, Caught by default */
 231         /* 0x0C - User Defined, Caught by default */
 232         /* 0x0D - User Defined, Caught by default */
 233         /* 0x0E - User Defined, Caught by default */
 234         /* 0x0F - User Defined, Caught by default */
 235         /* 0x10 HW Single step, handled here */
 236         case VEC_STEP:
 237                 info.si_code = TRAP_STEP;
 238                 sig = SIGTRAP;
 239                 CHK_DEBUGGER_TRAP_MAYBE();
 240                 /* Check if this is a single step in kernel space */
 241                 if (fp->ipend & 0xffc0)
 242                         return;
 243                 else
 244                         break;
 245         /* 0x11 - Trace Buffer Full, handled here */
 246         case VEC_OVFLOW:
 247                 info.si_code = TRAP_TRACEFLOW;
 248                 sig = SIGTRAP;
 249                 printk(KERN_EMERG EXC_0x11);
 250                 CHK_DEBUGGER_TRAP();
 251                 break;
 252         /* 0x12 - Reserved, Caught by default */
 253         /* 0x13 - Reserved, Caught by default */
 254         /* 0x14 - Reserved, Caught by default */
 255         /* 0x15 - Reserved, Caught by default */
 256         /* 0x16 - Reserved, Caught by default */
 257         /* 0x17 - Reserved, Caught by default */
 258         /* 0x18 - Reserved, Caught by default */
 259         /* 0x19 - Reserved, Caught by default */
 260         /* 0x1A - Reserved, Caught by default */
 261         /* 0x1B - Reserved, Caught by default */
 262         /* 0x1C - Reserved, Caught by default */
 263         /* 0x1D - Reserved, Caught by default */
 264         /* 0x1E - Reserved, Caught by default */
 265         /* 0x1F - Reserved, Caught by default */
 266         /* 0x20 - Reserved, Caught by default */
 267         /* 0x21 - Undefined Instruction, handled here */
 268         case VEC_UNDEF_I:
 269                 info.si_code = ILL_ILLOPC;
 270                 sig = SIGILL;
 271                 printk(KERN_EMERG EXC_0x21);
 272                 CHK_DEBUGGER_TRAP();
 273                 break;
 274         /* 0x22 - Illegal Instruction Combination, handled here */
 275         case VEC_ILGAL_I:
 276                 info.si_code = ILL_ILLPARAOP;
 277                 sig = SIGILL;
 278                 printk(KERN_EMERG EXC_0x22);
 279                 CHK_DEBUGGER_TRAP();
 280                 break;
 281         /* 0x23 - Data CPLB Protection Violation,
 282                  normal case is handled in _cplb_hdr */
 283         case VEC_CPLB_VL:
 284                 info.si_code = ILL_CPLB_VI;
 285                 sig = SIGILL;
 286                 printk(KERN_EMERG EXC_0x23);
 287                 CHK_DEBUGGER_TRAP();
 288                 break;
 289         /* 0x24 - Data access misaligned, handled here */
 290         case VEC_MISALI_D:
 291                 info.si_code = BUS_ADRALN;
 292                 sig = SIGBUS;
 293                 printk(KERN_EMERG EXC_0x24);
 294                 CHK_DEBUGGER_TRAP();
 295                 break;
 296         /* 0x25 - Unrecoverable Event, handled here */
 297         case VEC_UNCOV:
 298                 info.si_code = ILL_ILLEXCPT;
 299                 sig = SIGILL;
 300                 printk(KERN_EMERG EXC_0x25);
 301                 CHK_DEBUGGER_TRAP();
 302                 break;
 303         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 304                 error case is handled here */
 305         case VEC_CPLB_M:
 306                 info.si_code = BUS_ADRALN;
 307                 sig = SIGBUS;
 308                 printk(KERN_EMERG EXC_0x26);
 309                 CHK_DEBUGGER_TRAP();
 310                 break;
 311         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 312         case VEC_CPLB_MHIT:
 313                 info.si_code = ILL_CPLB_MULHIT;
 314 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 315                 sig = SIGSEGV;
 316                 printk(KERN_EMERG "\n"
 317                         KERN_EMERG "NULL pointer access (probably)\n");
 318 #else
 319                 sig = SIGILL;
 320                 printk(KERN_EMERG EXC_0x27);
 321 #endif
 322                 CHK_DEBUGGER_TRAP();
 323                 break;
 324         /* 0x28 - Emulation Watchpoint, handled here */
 325         case VEC_WATCH:
 326                 info.si_code = TRAP_WATCHPT;
 327                 sig = SIGTRAP;
 328                 pr_debug(EXC_0x28);
 329                 CHK_DEBUGGER_TRAP_MAYBE();
 330                 /* Check if this is a watchpoint in kernel space */
 331                 if (fp->ipend & 0xffc0)
 332                         return;
 333                 else
 334                         break;
 335 #ifdef CONFIG_BF535
 336         /* 0x29 - Instruction fetch access error (535 only) */
 337         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 338                 info.si_code = BUS_OPFETCH;
 339                 sig = SIGBUS;
 340                 printk(KERN_EMERG "BF535: VEC_ISTRU_VL\n");
 341                 CHK_DEBUGGER_TRAP();
 342                 break;
 343 #else
 344         /* 0x29 - Reserved, Caught by default */
 345 #endif
 346         /* 0x2A - Instruction fetch misaligned, handled here */
 347         case VEC_MISALI_I:
 348                 info.si_code = BUS_ADRALN;
 349                 sig = SIGBUS;
 350                 printk(KERN_EMERG EXC_0x2A);
 351                 CHK_DEBUGGER_TRAP();
 352                 break;
 353         /* 0x2B - Instruction CPLB protection Violation,
 354                 handled in _cplb_hdr */
 355         case VEC_CPLB_I_VL:
 356                 info.si_code = ILL_CPLB_VI;
 357                 sig = SIGILL;
 358                 printk(KERN_EMERG EXC_0x2B);
 359                 CHK_DEBUGGER_TRAP();
 360                 break;
 361         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 362         case VEC_CPLB_I_M:
 363                 info.si_code = ILL_CPLB_MISS;
 364                 sig = SIGBUS;
 365                 printk(KERN_EMERG EXC_0x2C);
 366                 CHK_DEBUGGER_TRAP();
 367                 break;
 368         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 369         case VEC_CPLB_I_MHIT:
 370                 info.si_code = ILL_CPLB_MULHIT;
 371 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 372                 sig = SIGSEGV;
 373                 printk(KERN_EMERG "\n\nJump to address 0 - 0x0fff\n");
 374 #else
 375                 sig = SIGILL;
 376                 printk(KERN_EMERG EXC_0x2D);
 377 #endif
 378                 CHK_DEBUGGER_TRAP();
 379                 break;
 380         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 381         case VEC_ILL_RES:
 382                 info.si_code = ILL_PRVOPC;
 383                 sig = SIGILL;
 384                 printk(KERN_EMERG EXC_0x2E);
 385                 CHK_DEBUGGER_TRAP();
 386                 break;
 387         /* 0x2F - Reserved, Caught by default */
 388         /* 0x30 - Reserved, Caught by default */
 389         /* 0x31 - Reserved, Caught by default */
 390         /* 0x32 - Reserved, Caught by default */
 391         /* 0x33 - Reserved, Caught by default */
 392         /* 0x34 - Reserved, Caught by default */
 393         /* 0x35 - Reserved, Caught by default */
 394         /* 0x36 - Reserved, Caught by default */
 395         /* 0x37 - Reserved, Caught by default */
 396         /* 0x38 - Reserved, Caught by default */
 397         /* 0x39 - Reserved, Caught by default */
 398         /* 0x3A - Reserved, Caught by default */
 399         /* 0x3B - Reserved, Caught by default */
 400         /* 0x3C - Reserved, Caught by default */
 401         /* 0x3D - Reserved, Caught by default */
 402         /* 0x3E - Reserved, Caught by default */
 403         /* 0x3F - Reserved, Caught by default */
 404         default:
 405                 info.si_code = TRAP_ILLTRAP;
 406                 sig = SIGTRAP;
 407                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 408                         (fp->seqstat & SEQSTAT_EXCAUSE));
 409                 CHK_DEBUGGER_TRAP();
 410                 break;
 411         }
 412
 413         if (sig != 0 && sig != SIGTRAP) {
 414                 unsigned long stack;
 415                 dump_bfin_regs(fp, (void *)fp->retx);
 416                 dump_bfin_trace_buffer();
 417                 show_stack(current, &stack);
 418                 if (current->mm == NULL)
 419                         panic("Kernel exception");
 420         }
 421         info.si_signo = sig;
 422         info.si_errno = 0;
 423         info.si_addr = (void *)fp->pc;
 424         force_sig_info(sig, &info, current);
 425
 426         /* if the address that we are about to return to is not valid, set it
 427          * to a valid address, if we have a current application or panic
 428          */
 429         if (!(fp->pc <= physical_mem_end
 430 #if L1_CODE_LENGTH != 0
 431             || (fp->pc >= L1_CODE_START &&
 432                 fp->pc <= (L1_CODE_START + L1_CODE_LENGTH))
 433 #endif
 434         )) {
 435                 if (current->mm) {
 436                         fp->pc = current->mm->start_code;
 437                 } else {
 438                         printk(KERN_EMERG
 439                                 "I can't return to memory that doesn't exist"
 440                                 " - bad things happen\n");
 441                         panic("Help - I've fallen and can't get up\n");
 442                 }
 443         }
 444
 445         trace_buffer_restore(j);
 446         return;
 447 }
 448
 449 /* Typical exception handling routines  */
 450
 451 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 452
 453 void dump_bfin_trace_buffer(void)
 454 {
 455 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 456         int tflags, i = 0;
 457 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 458         int j, index;
 459 #endif
 460
 461         trace_buffer_save(tflags);
 462
 463         printk(KERN_EMERG "Hardware Trace:\n");
 464
 465         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 466                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 467                         printk(KERN_EMERG "%4i Target : ", i);
 468                         printk_address((unsigned long)bfin_read_TBUF());
 469                         printk("\n" KERN_EMERG "     Source : ");
 470                         printk_address((unsigned long)bfin_read_TBUF());
 471                         printk("\n");
 472                 }
 473         }
 474
 475 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 476         if (trace_buff_offset)
 477                 index = trace_buff_offset/4 - 1;
 478         else
 479                 index = EXPAND_LEN;
 480
 481         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 482         while (j) {
 483                 printk(KERN_EMERG "%4i Target : ", i);
 484                 printk_address(software_trace_buff[index]);
 485                 index -= 1;
 486                 if (index < 0 )
 487                         index = EXPAND_LEN;
 488                 printk("\n" KERN_EMERG "     Source : ");
 489                 printk_address(software_trace_buff[index]);
 490                 index -= 1;
 491                 if (index < 0)
 492                         index = EXPAND_LEN;
 493                 printk("\n");
 494                 j--;
 495                 i++;
 496         }
 497 #endif
 498
 499         trace_buffer_restore(tflags);
 500 #endif
 501 }
 502 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 503
 504 static void show_trace(struct task_struct *tsk, unsigned long *sp)
 505 {
 506         unsigned long addr;
 507
 508         printk("\nCall Trace:");
 509 #ifdef CONFIG_KALLSYMS
 510         printk("\n");
 511 #endif
 512
 513         while (!kstack_end(sp)) {
 514                 addr = *sp++;
 515                 /*
 516                  * If the address is either in the text segment of the
 517                  * kernel, or in the region which contains vmalloc'ed
 518                  * memory, it *may* be the address of a calling
 519                  * routine; if so, print it so that someone tracing
 520                  * down the cause of the crash will be able to figure
 521                  * out the call path that was taken.
 522                  */
 523                 if (kernel_text_address(addr))
 524                         print_ip_sym(addr);
 525         }
 526
 527         printk("\n");
 528 }
 529
 530 void show_stack(struct task_struct *task, unsigned long *stack)
 531 {
 532         unsigned long *endstack, addr;
 533         int i;
 534
 535         /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
 536          * called externally in some places in the kernel.
 537          */
 538
 539         if (!stack) {
 540                 if (task)
 541                         stack = (unsigned long *)task->thread.ksp;
 542                 else
 543                         stack = (unsigned long *)&stack;
 544         }
 545
 546         addr = (unsigned long)stack;
 547         endstack = (unsigned long *)PAGE_ALIGN(addr);
 548
 549         printk(KERN_EMERG "Stack from %08lx:", (unsigned long)stack);
 550         for (i = 0; i < kstack_depth_to_print; i++) {
 551                 if (stack + 1 > endstack)
 552                         break;
 553                 if (i % 8 == 0)
 554                         printk("\n" KERN_EMERG "       ");
 555                 printk(" %08lx", *stack++);
 556         }
 557
 558         show_trace(task, stack);
 559 }
 560
 561 void dump_stack(void)
 562 {
 563         unsigned long stack;
 564 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 565         int tflags;
 566 #endif
 567         trace_buffer_save(tflags);
 568         dump_bfin_trace_buffer();
 569         show_stack(current, &stack);
 570         trace_buffer_restore(tflags);
 571 }
 572
 573 EXPORT_SYMBOL(dump_stack);
 574
 575 void dump_bfin_regs(struct pt_regs *fp, void *retaddr)
 576 {
 577         if (current->pid) {
 578                 printk(KERN_EMERG "\n" KERN_EMERG "CURRENT PROCESS:\n"
 579                         KERN_EMERG "\n");
 580                 printk(KERN_EMERG "COMM=%s PID=%d\n",
 581                         current->comm, current->pid);
 582         } else {
 583                 printk
 584                     (KERN_EMERG "\n" KERN_EMERG
 585                      "No Valid pid - Either things are really messed up,"
 586                      " or you are in the kernel\n");
 587         }
 588
 589         if (current->mm) {
 590                 printk(KERN_EMERG "TEXT = 0x%p-0x%p  DATA = 0x%p-0x%p\n"
 591                        KERN_EMERG "BSS = 0x%p-0x%p   USER-STACK = 0x%p\n"
 592                        KERN_EMERG "\n",
 593                        (void *)current->mm->start_code,
 594                        (void *)current->mm->end_code,
 595                        (void *)current->mm->start_data,
 596                        (void *)current->mm->end_data,
 597                        (void *)current->mm->end_data,
 598                        (void *)current->mm->brk,
 599                        (void *)current->mm->start_stack);
 600         }
 601
 602         printk(KERN_EMERG "return address: [0x%p]; contents of:", retaddr);
 603         if (retaddr != 0 && retaddr <= (void *)physical_mem_end
 604 #if L1_CODE_LENGTH != 0
 605             /* FIXME: Copy the code out of L1 Instruction SRAM through dma
 606                memcpy.  */
 607             && !(retaddr >= (void *)L1_CODE_START
 608                  && retaddr < (void *)(L1_CODE_START + L1_CODE_LENGTH))
 609 #endif
 610         ) {
 611                 int i = ((unsigned int)retaddr & 0xFFFFFFF0) - 32;
 612                 unsigned short x = 0;
 613                 for (; i < ((unsigned int)retaddr & 0xFFFFFFF0) + 32; i += 2) {
 614                         if (!(i & 0xF))
 615                                 printk("\n" KERN_EMERG "0x%08x: ", i);
 616
 617                         if (get_user(x, (unsigned short *)i))
 618                                 break;
 619 #ifndef CONFIG_DEBUG_HWERR
 620                         /* If one of the last few instructions was a STI
 621                          * it is likely that the error occured awhile ago
 622                          * and we just noticed
 623                          */
 624                         if (x >= 0x0040 && x <= 0x0047 && i <= 0)
 625                                 panic("\n\nWARNING : You should reconfigure"
 626                                         " the kernel to turn on\n"
 627                                         " 'Hardware error interrupt"
 628                                         " debugging'\n"
 629                                         " The rest of this error"
 630                                         " is meanless\n");
 631 #endif
 632                         if (i == (unsigned int)retaddr)
 633                                 printk("[%04x]", x);
 634                         else
 635                                 printk(" %04x ", x);
 636                 }
 637                 printk("\n" KERN_EMERG "\n");
 638         } else
 639                 printk(KERN_EMERG
 640                         "Cannot look at the [PC] for it is"
 641                         "in unreadable L1 SRAM - sorry\n");
 642
 643
 644         printk(KERN_EMERG
 645                 "RETE:  %08lx  RETN: %08lx  RETX: %08lx  RETS: %08lx\n",
 646                 fp->rete, fp->retn, fp->retx, fp->rets);
 647         printk(KERN_EMERG "IPEND: %04lx  SYSCFG: %04lx\n",
 648                 fp->ipend, fp->syscfg);
 649         printk(KERN_EMERG "SEQSTAT: %08lx    SP: %08lx\n",
 650                 (long)fp->seqstat, (long)fp);
 651         printk(KERN_EMERG "R0: %08lx    R1: %08lx    R2: %08lx    R3: %08lx\n",
 652                 fp->r0, fp->r1, fp->r2, fp->r3);
 653         printk(KERN_EMERG "R4: %08lx    R5: %08lx    R6: %08lx    R7: %08lx\n",
 654                 fp->r4, fp->r5, fp->r6, fp->r7);
 655         printk(KERN_EMERG "P0: %08lx    P1: %08lx    P2: %08lx    P3: %08lx\n",
 656                 fp->p0, fp->p1, fp->p2, fp->p3);
 657         printk(KERN_EMERG
 658                 "P4: %08lx    P5: %08lx    FP: %08lx\n",
 659                 fp->p4, fp->p5, fp->fp);
 660         printk(KERN_EMERG
 661                 "A0.w: %08lx    A0.x: %08lx    A1.w: %08lx    A1.x: %08lx\n",
 662                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
 663
 664         printk(KERN_EMERG "LB0: %08lx  LT0: %08lx  LC0: %08lx\n",
 665                 fp->lb0, fp->lt0, fp->lc0);
 666         printk(KERN_EMERG "LB1: %08lx  LT1: %08lx  LC1: %08lx\n",
 667                 fp->lb1, fp->lt1, fp->lc1);
 668         printk(KERN_EMERG "B0: %08lx  L0: %08lx  M0: %08lx  I0: %08lx\n",
 669                 fp->b0, fp->l0, fp->m0, fp->i0);
 670         printk(KERN_EMERG "B1: %08lx  L1: %08lx  M1: %08lx  I1: %08lx\n",
 671                 fp->b1, fp->l1, fp->m1, fp->i1);
 672         printk(KERN_EMERG "B2: %08lx  L2: %08lx  M2: %08lx  I2: %08lx\n",
 673                 fp->b2, fp->l2, fp->m2, fp->i2);
 674         printk(KERN_EMERG "B3: %08lx  L3: %08lx  M3: %08lx  I3: %08lx\n",
 675                 fp->b3, fp->l3, fp->m3, fp->i3);
 676
 677         printk(KERN_EMERG "\n" KERN_EMERG "USP: %08lx   ASTAT: %08lx\n",
 678                 rdusp(), fp->astat);
 679         if ((long)fp->seqstat & SEQSTAT_EXCAUSE) {
 680                 printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n",
 681                         (void *)bfin_read_DCPLB_FAULT_ADDR());
 682                 printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n",
 683                         (void *)bfin_read_ICPLB_FAULT_ADDR());
 684         }
 685
 686         printk("\n\n");
 687 }
 688
 689 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
 690 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
 691 #endif
 692
 693 asmlinkage int sys_bfin_spinlock(int *spinlock)
 694 {
 695         int ret = 0;
 696         int tmp = 0;
 697
 698         local_irq_disable();
 699         ret = get_user(tmp, spinlock);
 700         if (ret == 0) {
 701                 if (tmp)
 702                         ret = 1;
 703                 tmp = 1;
 704                 put_user(tmp, spinlock);
 705         }
 706         local_irq_enable();
 707         return ret;
 708 }
 709
 710 int bfin_request_exception(unsigned int exception, void (*handler)(void))
 711 {
 712         void (*curr_handler)(void);
 713
 714         if (exception > 0x3F)
 715                 return -EINVAL;
 716
 717         curr_handler = ex_table[exception];
 718
 719         if (curr_handler != ex_replaceable)
 720                 return -EBUSY;
 721
 722         ex_table[exception] = handler;
 723
 724         return 0;
 725 }
 726 EXPORT_SYMBOL(bfin_request_exception);
 727
 728 int bfin_free_exception(unsigned int exception, void (*handler)(void))
 729 {
 730         void (*curr_handler)(void);
 731
 732         if (exception > 0x3F)
 733                 return -EINVAL;
 734
 735         curr_handler = ex_table[exception];
 736
 737         if (curr_handler != handler)
 738                 return -EBUSY;
 739
 740         ex_table[exception] = ex_replaceable;
 741
 742         return 0;
 743 }
 744 EXPORT_SYMBOL(bfin_free_exception);
 745
 746 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
 747 {
 748         switch (cplb_panic) {
 749         case CPLB_NO_UNLOCKED:
 750                 printk(KERN_EMERG "All CPLBs are locked\n");
 751                 break;
 752         case CPLB_PROT_VIOL:
 753                 return;
 754         case CPLB_NO_ADDR_MATCH:
 755                 return;
 756         case CPLB_UNKNOWN_ERR:
 757                 printk(KERN_EMERG "Unknown CPLB Exception\n");
 758                 break;
 759         }
 760
 761         printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void *)bfin_read_DCPLB_FAULT_ADDR());
 762         printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void *)bfin_read_ICPLB_FAULT_ADDR());
 763         dump_bfin_regs(fp, (void *)fp->retx);
 764         dump_stack();
 765         panic("Unrecoverable event\n");
 766 }