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