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