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