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 #include <asm/fixed_code.h>
  41
  42 #ifdef CONFIG_KGDB
  43 # include <linux/debugger.h>
  44 # include <linux/kgdb.h>
  45
  46 # define CHK_DEBUGGER_TRAP() \
  47         do { \
  48                 CHK_DEBUGGER(trapnr, sig, info.si_code, fp, ); \
  49         } while (0)
  50 # define CHK_DEBUGGER_TRAP_MAYBE() \
  51         do { \
  52                 if (kgdb_connected) \
  53                         CHK_DEBUGGER_TRAP(); \
  54         } while (0)
  55 #else
  56 # define CHK_DEBUGGER_TRAP() do { } while (0)
  57 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  58 #endif
  59
  60 /* Initiate the event table handler */
  61 void __init trap_init(void)
  62 {
  63         CSYNC();
  64         bfin_write_EVT3(trap);
  65         CSYNC();
  66 }
  67
  68 int kstack_depth_to_print = 48;
  69
  70 static void decode_address(char *buf, unsigned long address)
  71 {
  72         struct vm_list_struct *vml;
  73         struct task_struct *p;
  74         struct mm_struct *mm;
  75         unsigned long flags, offset;
  76         unsigned int in_exception = bfin_read_IPEND() & 0x10;
  77
  78 #ifdef CONFIG_KALLSYMS
  79         unsigned long symsize;
  80         const char *symname;
  81         char *modname;
  82         char *delim = ":";
  83         char namebuf[128];
  84
  85         /* look up the address and see if we are in kernel space */
  86         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
  87
  88         if (symname) {
  89                 /* yeah! kernel space! */
  90                 if (!modname)
  91                         modname = delim = "";
  92                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
  93                               (void *)address, delim, modname, delim, symname,
  94                               (unsigned long)offset);
  95                 return;
  96
  97         }
  98 #endif
  99
 100         /* Problem in fixed code section? */
 101         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 102                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
 103                 return;
 104         }
 105
 106         /* Problem somewhere before the kernel start address */
 107         if (address < CONFIG_BOOT_LOAD) {
 108                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
 109                 return;
 110         }
 111
 112         /* looks like we're off in user-land, so let's walk all the
 113          * mappings of all our processes and see if we can't be a whee
 114          * bit more specific
 115          */
 116         write_lock_irqsave(&tasklist_lock, flags);
 117         for_each_process(p) {
 118                 mm = (in_exception ? p->mm : get_task_mm(p));
 119                 if (!mm)
 120                         continue;
 121
 122                 vml = mm->context.vmlist;
 123                 while (vml) {
 124                         struct vm_area_struct *vma = vml->vma;
 125
 126                         if (address >= vma->vm_start && address < vma->vm_end) {
 127                                 char *name = p->comm;
 128                                 struct file *file = vma->vm_file;
 129                                 if (file) {
 130                                         char _tmpbuf[256];
 131                                         name = d_path(file->f_dentry,
 132                                                       file->f_vfsmnt,
 133                                                       _tmpbuf,
 134                                                       sizeof(_tmpbuf));
 135                                 }
 136
 137                                 /* FLAT does not have its text aligned to the start of
 138                                  * the map while FDPIC ELF does ...
 139                                  */
 140                                 if (current->mm &&
 141                                     (address > current->mm->start_code) &&
 142                                     (address < current->mm->end_code))
 143                                         offset = address - current->mm->start_code;
 144                                 else
 145                                         offset = (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
 146
 147                                 sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 148                                         (void *)address, name, offset);
 149                                 if (!in_exception)
 150                                         mmput(mm);
 151                                 goto done;
 152                         }
 153
 154                         vml = vml->next;
 155                 }
 156                 if (!in_exception)
 157                         mmput(mm);
 158         }
 159
 160         /* we were unable to find this address anywhere */
 161         sprintf(buf, "<0x%p> /* unknown address */", (void *)address);
 162
 163 done:
 164         write_unlock_irqrestore(&tasklist_lock, flags);
 165 }
 166
 167 asmlinkage void double_fault_c(struct pt_regs *fp)
 168 {
 169         console_verbose();
 170         oops_in_progress = 1;
 171         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 172         dump_bfin_regs(fp, (void *)fp->retx);
 173         panic("Double Fault - unrecoverable event\n");
 174
 175 }
 176
 177 asmlinkage void trap_c(struct pt_regs *fp)
 178 {
 179 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 180         int j;
 181 #endif
 182         int sig = 0;
 183         siginfo_t info;
 184         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 185
 186         trace_buffer_save(j);
 187
 188         /* Important - be very careful dereferncing pointers - will lead to
 189          * double faults if the stack has become corrupt
 190          */
 191
 192         /* If the fault was caused by a kernel thread, or interrupt handler
 193          * we will kernel panic, so the system reboots.
 194          * If KGDB is enabled, don't set this for kernel breakpoints
 195         */
 196         if ((bfin_read_IPEND() & 0xFFC0)
 197 #ifdef CONFIG_KGDB
 198                 && trapnr != VEC_EXCPT02
 199 #endif
 200         ){
 201                 console_verbose();
 202                 oops_in_progress = 1;
 203         } else if (current) {
 204                 if (current->mm == NULL) {
 205                         console_verbose();
 206                         oops_in_progress = 1;
 207                 }
 208         }
 209
 210         /* trap_c() will be called for exceptions. During exceptions
 211          * processing, the pc value should be set with retx value.
 212          * With this change we can cleanup some code in signal.c- TODO
 213          */
 214         fp->orig_pc = fp->retx;
 215         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 216                 trapnr, fp->ipend, fp->pc, fp->retx); */
 217
 218         /* send the appropriate signal to the user program */
 219         switch (trapnr) {
 220
 221         /* This table works in conjuction with the one in ./mach-common/entry.S
 222          * Some exceptions are handled there (in assembly, in exception space)
 223          * Some are handled here, (in C, in interrupt space)
 224          * Some, like CPLB, are handled in both, where the normal path is
 225          * handled in assembly/exception space, and the error path is handled
 226          * here
 227          */
 228
 229         /* 0x00 - Linux Syscall, getting here is an error */
 230         /* 0x01 - userspace gdb breakpoint, handled here */
 231         case VEC_EXCPT01:
 232                 info.si_code = TRAP_ILLTRAP;
 233                 sig = SIGTRAP;
 234                 CHK_DEBUGGER_TRAP_MAYBE();
 235                 /* Check if this is a breakpoint in kernel space */
 236                 if (fp->ipend & 0xffc0)
 237                         return;
 238                 else
 239                         break;
 240 #ifdef CONFIG_KGDB
 241         case VEC_EXCPT02 :               /* gdb connection */
 242                 info.si_code = TRAP_ILLTRAP;
 243                 sig = SIGTRAP;
 244                 CHK_DEBUGGER_TRAP();
 245                 return;
 246 #else
 247         /* 0x02 - User Defined, Caught by default */
 248 #endif
 249         /* 0x03 - User Defined, userspace stack overflow */
 250         case VEC_EXCPT03:
 251                 info.si_code = SEGV_STACKFLOW;
 252                 sig = SIGSEGV;
 253                 printk(KERN_NOTICE EXC_0x03);
 254                 CHK_DEBUGGER_TRAP();
 255                 break;
 256         /* 0x04 - User Defined, Caught by default */
 257         /* 0x05 - User Defined, Caught by default */
 258         /* 0x06 - User Defined, Caught by default */
 259         /* 0x07 - User Defined, Caught by default */
 260         /* 0x08 - User Defined, Caught by default */
 261         /* 0x09 - User Defined, Caught by default */
 262         /* 0x0A - User Defined, Caught by default */
 263         /* 0x0B - User Defined, Caught by default */
 264         /* 0x0C - User Defined, Caught by default */
 265         /* 0x0D - User Defined, Caught by default */
 266         /* 0x0E - User Defined, Caught by default */
 267         /* 0x0F - User Defined, Caught by default */
 268         /* 0x10 HW Single step, handled here */
 269         case VEC_STEP:
 270                 info.si_code = TRAP_STEP;
 271                 sig = SIGTRAP;
 272                 CHK_DEBUGGER_TRAP_MAYBE();
 273                 /* Check if this is a single step in kernel space */
 274                 if (fp->ipend & 0xffc0)
 275                         return;
 276                 else
 277                         break;
 278         /* 0x11 - Trace Buffer Full, handled here */
 279         case VEC_OVFLOW:
 280                 info.si_code = TRAP_TRACEFLOW;
 281                 sig = SIGTRAP;
 282                 printk(KERN_NOTICE EXC_0x11);
 283                 CHK_DEBUGGER_TRAP();
 284                 break;
 285         /* 0x12 - Reserved, Caught by default */
 286         /* 0x13 - Reserved, Caught by default */
 287         /* 0x14 - Reserved, Caught by default */
 288         /* 0x15 - Reserved, Caught by default */
 289         /* 0x16 - Reserved, Caught by default */
 290         /* 0x17 - Reserved, Caught by default */
 291         /* 0x18 - Reserved, Caught by default */
 292         /* 0x19 - Reserved, Caught by default */
 293         /* 0x1A - Reserved, Caught by default */
 294         /* 0x1B - Reserved, Caught by default */
 295         /* 0x1C - Reserved, Caught by default */
 296         /* 0x1D - Reserved, Caught by default */
 297         /* 0x1E - Reserved, Caught by default */
 298         /* 0x1F - Reserved, Caught by default */
 299         /* 0x20 - Reserved, Caught by default */
 300         /* 0x21 - Undefined Instruction, handled here */
 301         case VEC_UNDEF_I:
 302                 info.si_code = ILL_ILLOPC;
 303                 sig = SIGILL;
 304                 printk(KERN_NOTICE EXC_0x21);
 305                 CHK_DEBUGGER_TRAP();
 306                 break;
 307         /* 0x22 - Illegal Instruction Combination, handled here */
 308         case VEC_ILGAL_I:
 309                 info.si_code = ILL_ILLPARAOP;
 310                 sig = SIGILL;
 311                 printk(KERN_NOTICE EXC_0x22);
 312                 CHK_DEBUGGER_TRAP();
 313                 break;
 314         /* 0x23 - Data CPLB protection violation, handled here */
 315         case VEC_CPLB_VL:
 316                 info.si_code = ILL_CPLB_VI;
 317                 sig = SIGBUS;
 318                 printk(KERN_NOTICE EXC_0x23);
 319                 CHK_DEBUGGER_TRAP();
 320                 break;
 321         /* 0x24 - Data access misaligned, handled here */
 322         case VEC_MISALI_D:
 323                 info.si_code = BUS_ADRALN;
 324                 sig = SIGBUS;
 325                 printk(KERN_NOTICE EXC_0x24);
 326                 CHK_DEBUGGER_TRAP();
 327                 break;
 328         /* 0x25 - Unrecoverable Event, handled here */
 329         case VEC_UNCOV:
 330                 info.si_code = ILL_ILLEXCPT;
 331                 sig = SIGILL;
 332                 printk(KERN_NOTICE EXC_0x25);
 333                 CHK_DEBUGGER_TRAP();
 334                 break;
 335         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 336                 error case is handled here */
 337         case VEC_CPLB_M:
 338                 info.si_code = BUS_ADRALN;
 339                 sig = SIGBUS;
 340                 printk(KERN_NOTICE EXC_0x26);
 341                 CHK_DEBUGGER_TRAP();
 342                 break;
 343         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 344         case VEC_CPLB_MHIT:
 345                 info.si_code = ILL_CPLB_MULHIT;
 346 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 347                 sig = SIGSEGV;
 348                 printk(KERN_NOTICE "NULL pointer access (probably)\n");
 349 #else
 350                 sig = SIGILL;
 351                 printk(KERN_NOTICE EXC_0x27);
 352 #endif
 353                 CHK_DEBUGGER_TRAP();
 354                 break;
 355         /* 0x28 - Emulation Watchpoint, handled here */
 356         case VEC_WATCH:
 357                 info.si_code = TRAP_WATCHPT;
 358                 sig = SIGTRAP;
 359                 pr_debug(EXC_0x28);
 360                 CHK_DEBUGGER_TRAP_MAYBE();
 361                 /* Check if this is a watchpoint in kernel space */
 362                 if (fp->ipend & 0xffc0)
 363                         return;
 364                 else
 365                         break;
 366 #ifdef CONFIG_BF535
 367         /* 0x29 - Instruction fetch access error (535 only) */
 368         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 369                 info.si_code = BUS_OPFETCH;
 370                 sig = SIGBUS;
 371                 printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 372                 CHK_DEBUGGER_TRAP();
 373                 break;
 374 #else
 375         /* 0x29 - Reserved, Caught by default */
 376 #endif
 377         /* 0x2A - Instruction fetch misaligned, handled here */
 378         case VEC_MISALI_I:
 379                 info.si_code = BUS_ADRALN;
 380                 sig = SIGBUS;
 381                 printk(KERN_NOTICE EXC_0x2A);
 382                 CHK_DEBUGGER_TRAP();
 383                 break;
 384         /* 0x2B - Instruction CPLB protection violation, handled here */
 385         case VEC_CPLB_I_VL:
 386                 info.si_code = ILL_CPLB_VI;
 387                 sig = SIGBUS;
 388                 printk(KERN_NOTICE EXC_0x2B);
 389                 CHK_DEBUGGER_TRAP();
 390                 break;
 391         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 392         case VEC_CPLB_I_M:
 393                 info.si_code = ILL_CPLB_MISS;
 394                 sig = SIGBUS;
 395                 printk(KERN_NOTICE EXC_0x2C);
 396                 CHK_DEBUGGER_TRAP();
 397                 break;
 398         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 399         case VEC_CPLB_I_MHIT:
 400                 info.si_code = ILL_CPLB_MULHIT;
 401 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 402                 sig = SIGSEGV;
 403                 printk(KERN_NOTICE "Jump to address 0 - 0x0fff\n");
 404 #else
 405                 sig = SIGILL;
 406                 printk(KERN_NOTICE EXC_0x2D);
 407 #endif
 408                 CHK_DEBUGGER_TRAP();
 409                 break;
 410         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 411         case VEC_ILL_RES:
 412                 info.si_code = ILL_PRVOPC;
 413                 sig = SIGILL;
 414                 printk(KERN_NOTICE EXC_0x2E);
 415                 CHK_DEBUGGER_TRAP();
 416                 break;
 417         /* 0x2F - Reserved, Caught by default */
 418         /* 0x30 - Reserved, Caught by default */
 419         /* 0x31 - Reserved, Caught by default */
 420         /* 0x32 - Reserved, Caught by default */
 421         /* 0x33 - Reserved, Caught by default */
 422         /* 0x34 - Reserved, Caught by default */
 423         /* 0x35 - Reserved, Caught by default */
 424         /* 0x36 - Reserved, Caught by default */
 425         /* 0x37 - Reserved, Caught by default */
 426         /* 0x38 - Reserved, Caught by default */
 427         /* 0x39 - Reserved, Caught by default */
 428         /* 0x3A - Reserved, Caught by default */
 429         /* 0x3B - Reserved, Caught by default */
 430         /* 0x3C - Reserved, Caught by default */
 431         /* 0x3D - Reserved, Caught by default */
 432         /* 0x3E - Reserved, Caught by default */
 433         /* 0x3F - Reserved, Caught by default */
 434         default:
 435                 info.si_code = TRAP_ILLTRAP;
 436                 sig = SIGTRAP;
 437                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 438                         (fp->seqstat & SEQSTAT_EXCAUSE));
 439                 CHK_DEBUGGER_TRAP();
 440                 break;
 441         }
 442
 443         BUG_ON(sig == 0);
 444
 445         if (sig != SIGTRAP) {
 446                 unsigned long stack;
 447                 dump_bfin_regs(fp, (void *)fp->retx);
 448
 449                 /* Print out the trace buffer if it makes sense */
 450 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 451                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 452                         printk(KERN_NOTICE "No trace since you do not have "
 453                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 454                                 KERN_NOTICE "\n");
 455                 else
 456 #endif
 457                         dump_bfin_trace_buffer();
 458                 show_stack(current, &stack);
 459                 if (oops_in_progress) {
 460 #ifndef CONFIG_ACCESS_CHECK
 461                         printk(KERN_EMERG "Hey - dork - please turn on "
 462                                 "CONFIG_ACCESS_CHECK\n");
 463 #endif
 464                         panic("Kernel exception");
 465                 }
 466
 467                 /* Ensure that bad return addresses don't end up in an infinite
 468                  * loop, due to speculative loads/reads
 469                  */
 470                 if (trapnr == VEC_CPLB_I_M)
 471                         fp->pc = SAFE_USER_INSTRUCTION;
 472         }
 473         info.si_signo = sig;
 474         info.si_errno = 0;
 475         info.si_addr = (void *)fp->pc;
 476         force_sig_info(sig, &info, current);
 477
 478         trace_buffer_restore(j);
 479         return;
 480 }
 481
 482 /* Typical exception handling routines  */
 483
 484 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 485
 486 void dump_bfin_trace_buffer(void)
 487 {
 488 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 489         int tflags, i = 0;
 490         char buf[150];
 491 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 492         int j, index;
 493 #endif
 494
 495         trace_buffer_save(tflags);
 496
 497         printk(KERN_NOTICE "Hardware Trace:\n");
 498
 499         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 500                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 501                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 502                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 503                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 504                         printk(KERN_NOTICE "     Source : %s\n", buf);
 505                 }
 506         }
 507
 508 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 509         if (trace_buff_offset)
 510                 index = trace_buff_offset/4 - 1;
 511         else
 512                 index = EXPAND_LEN;
 513
 514         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 515         while (j) {
 516                 decode_address(buf, software_trace_buff[index]);
 517                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 518                 index -= 1;
 519                 if (index < 0 )
 520                         index = EXPAND_LEN;
 521                 decode_address(buf, software_trace_buff[index]);
 522                 printk(KERN_NOTICE "     Source : %s\n", buf);
 523                 index -= 1;
 524                 if (index < 0)
 525                         index = EXPAND_LEN;
 526                 j--;
 527                 i++;
 528         }
 529 #endif
 530
 531         trace_buffer_restore(tflags);
 532 #endif
 533 }
 534 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 535
 536 static void show_trace(struct task_struct *tsk, unsigned long *sp)
 537 {
 538         unsigned long addr;
 539
 540         printk(KERN_NOTICE "\n" KERN_NOTICE "Call Trace:\n");
 541
 542         while (!kstack_end(sp)) {
 543                 addr = *sp++;
 544                 /*
 545                  * If the address is either in the text segment of the
 546                  * kernel, or in the region which contains vmalloc'ed
 547                  * memory, it *may* be the address of a calling
 548                  * routine; if so, print it so that someone tracing
 549                  * down the cause of the crash will be able to figure
 550                  * out the call path that was taken.
 551                  */
 552                 if (kernel_text_address(addr))
 553                         print_ip_sym(addr);
 554         }
 555
 556         printk(KERN_NOTICE "\n");
 557 }
 558
 559 void show_stack(struct task_struct *task, unsigned long *stack)
 560 {
 561         unsigned long *endstack, addr;
 562         int i;
 563
 564         /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
 565          * called externally in some places in the kernel.
 566          */
 567
 568         if (!stack) {
 569                 if (task)
 570                         stack = (unsigned long *)task->thread.ksp;
 571                 else
 572                         stack = (unsigned long *)&stack;
 573         }
 574
 575         addr = (unsigned long)stack;
 576         endstack = (unsigned long *)PAGE_ALIGN(addr);
 577
 578         printk(KERN_NOTICE "Stack from %08lx:", (unsigned long)stack);
 579         for (i = 0; i < kstack_depth_to_print; i++) {
 580                 if (stack + 1 > endstack)
 581                         break;
 582                 if (i % 8 == 0)
 583                         printk("\n" KERN_NOTICE "       ");
 584                 printk(" %08lx", *stack++);
 585         }
 586         printk("\n");
 587
 588         show_trace(task, stack);
 589 }
 590
 591 void dump_stack(void)
 592 {
 593         unsigned long stack;
 594 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 595         int tflags;
 596 #endif
 597         trace_buffer_save(tflags);
 598         dump_bfin_trace_buffer();
 599         show_stack(current, &stack);
 600         trace_buffer_restore(tflags);
 601 }
 602
 603 EXPORT_SYMBOL(dump_stack);
 604
 605 void dump_bfin_regs(struct pt_regs *fp, void *retaddr)
 606 {
 607         char buf [150];
 608
 609         if (!oops_in_progress) {
 610                 if (current->pid && current->mm) {
 611                         printk(KERN_NOTICE "\n" KERN_NOTICE "CURRENT PROCESS:\n");
 612                         printk(KERN_NOTICE "COMM=%s PID=%d\n",
 613                                 current->comm, current->pid);
 614
 615                         printk(KERN_NOTICE "TEXT = 0x%p-0x%p  DATA = 0x%p-0x%p\n"
 616                                 KERN_NOTICE "BSS = 0x%p-0x%p   USER-STACK = 0x%p\n"
 617                                 KERN_NOTICE "\n",
 618                                 (void *)current->mm->start_code,
 619                                 (void *)current->mm->end_code,
 620                                 (void *)current->mm->start_data,
 621                                 (void *)current->mm->end_data,
 622                                 (void *)current->mm->end_data,
 623                                 (void *)current->mm->brk,
 624                                 (void *)current->mm->start_stack);
 625                 } else {
 626                         printk (KERN_NOTICE "\n" KERN_NOTICE
 627                              "No Valid pid - Either things are really messed up,"
 628                              " or you are in the kernel\n");
 629                 }
 630         } else {
 631                 printk(KERN_NOTICE "Kernel or interrupt exception\n");
 632                 print_modules();
 633         }
 634
 635         if (retaddr >= (void *)FIXED_CODE_START  && retaddr < (void *)physical_mem_end
 636 #if L1_CODE_LENGTH != 0
 637             /* FIXME: Copy the code out of L1 Instruction SRAM through dma
 638                memcpy.  */
 639             && !(retaddr >= (void *)L1_CODE_START
 640                  && retaddr < (void *)(L1_CODE_START + L1_CODE_LENGTH))
 641 #endif
 642         ) {
 643                 int i = ((unsigned int)retaddr & 0xFFFFFFF0) - 32;
 644                 unsigned short x = 0;
 645                 printk(KERN_NOTICE "return address: [0x%p]; contents of:", retaddr);
 646                 for (; i < ((unsigned int)retaddr & 0xFFFFFFF0) + 32; i += 2) {
 647                         if (!(i & 0xF))
 648                                 printk("\n" KERN_NOTICE "0x%08x: ", i);
 649
 650                         if (get_user(x, (unsigned short *)i))
 651                                 break;
 652 #ifndef CONFIG_DEBUG_HWERR
 653                         /* If one of the last few instructions was a STI
 654                          * it is likely that the error occured awhile ago
 655                          * and we just noticed. This only happens in kernel
 656                          * context, which should mean an oops is happening
 657                          */
 658                         if (oops_in_progress && x >= 0x0040 && x <= 0x0047 && i <= 0)
 659                                 panic("\n\nWARNING : You should reconfigure"
 660                                         " the kernel to turn on\n"
 661                                         " 'Hardware error interrupt"
 662                                         " debugging'\n"
 663                                         " The rest of this error"
 664                                         " is meanless\n");
 665 #endif
 666                         if (i == (unsigned int)retaddr)
 667                                 printk("[%04x]", x);
 668                         else
 669                                 printk(" %04x ", x);
 670                 }
 671                 printk("\n");
 672         } else
 673                 printk("\n" KERN_NOTICE
 674                         "Cannot look at the [PC] <%p> for it is"
 675                         " in unreadable memory - sorry\n", retaddr);
 676
 677         printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\n");
 678         printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
 679                 (long)fp->seqstat, fp->ipend, fp->syscfg);
 680
 681         decode_address(buf, fp->rete);
 682         printk(KERN_NOTICE " RETE: %s\n", buf);
 683         decode_address(buf, fp->retn);
 684         printk(KERN_NOTICE " RETN: %s\n", buf);
 685         decode_address(buf, fp->retx);
 686         printk(KERN_NOTICE " RETX: %s\n", buf);
 687         decode_address(buf, fp->rets);
 688         printk(KERN_NOTICE " RETS: %s\n", buf);
 689
 690         if ((long)fp->seqstat & SEQSTAT_EXCAUSE) {
 691                 decode_address(buf, bfin_read_DCPLB_FAULT_ADDR());
 692                 printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
 693                 decode_address(buf, bfin_read_ICPLB_FAULT_ADDR());
 694                 printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
 695         }
 696
 697         printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
 698         printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
 699                 fp->r0, fp->r1, fp->r2, fp->r3);
 700         printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
 701                 fp->r4, fp->r5, fp->r6, fp->r7);
 702         printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
 703                 fp->p0, fp->p1, fp->p2, fp->p3);
 704         printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
 705                 fp->p4, fp->p5, fp->fp, (long)fp);
 706         printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
 707                 fp->lb0, fp->lt0, fp->lc0);
 708         printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
 709                 fp->lb1, fp->lt1, fp->lc1);
 710         printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
 711                 fp->b0, fp->l0, fp->m0, fp->i0);
 712         printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
 713                 fp->b1, fp->l1, fp->m1, fp->i1);
 714         printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
 715                 fp->b2, fp->l2, fp->m2, fp->i2);
 716         printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
 717                 fp->b3, fp->l3, fp->m3, fp->i3);
 718         printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
 719                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
 720
 721         printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
 722                 rdusp(), fp->astat);
 723
 724         printk(KERN_NOTICE "\n");
 725 }
 726
 727 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
 728 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
 729 #endif
 730
 731 asmlinkage int sys_bfin_spinlock(int *spinlock)
 732 {
 733         int ret = 0;
 734         int tmp = 0;
 735
 736         local_irq_disable();
 737         ret = get_user(tmp, spinlock);
 738         if (ret == 0) {
 739                 if (tmp)
 740                         ret = 1;
 741                 tmp = 1;
 742                 put_user(tmp, spinlock);
 743         }
 744         local_irq_enable();
 745         return ret;
 746 }
 747
 748 int bfin_request_exception(unsigned int exception, void (*handler)(void))
 749 {
 750         void (*curr_handler)(void);
 751
 752         if (exception > 0x3F)
 753                 return -EINVAL;
 754
 755         curr_handler = ex_table[exception];
 756
 757         if (curr_handler != ex_replaceable)
 758                 return -EBUSY;
 759
 760         ex_table[exception] = handler;
 761
 762         return 0;
 763 }
 764 EXPORT_SYMBOL(bfin_request_exception);
 765
 766 int bfin_free_exception(unsigned int exception, void (*handler)(void))
 767 {
 768         void (*curr_handler)(void);
 769
 770         if (exception > 0x3F)
 771                 return -EINVAL;
 772
 773         curr_handler = ex_table[exception];
 774
 775         if (curr_handler != handler)
 776                 return -EBUSY;
 777
 778         ex_table[exception] = ex_replaceable;
 779
 780         return 0;
 781 }
 782 EXPORT_SYMBOL(bfin_free_exception);
 783
 784 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
 785 {
 786         switch (cplb_panic) {
 787         case CPLB_NO_UNLOCKED:
 788                 printk(KERN_EMERG "All CPLBs are locked\n");
 789                 break;
 790         case CPLB_PROT_VIOL:
 791                 return;
 792         case CPLB_NO_ADDR_MATCH:
 793                 return;
 794         case CPLB_UNKNOWN_ERR:
 795                 printk(KERN_EMERG "Unknown CPLB Exception\n");
 796                 break;
 797         }
 798
 799         oops_in_progress = 1;
 800
 801         printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void *)bfin_read_DCPLB_FAULT_ADDR());
 802         printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void *)bfin_read_ICPLB_FAULT_ADDR());
 803         dump_bfin_regs(fp, (void *)fp->retx);
 804         dump_stack();
 805         panic("Unrecoverable event\n");
 806 }