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 <linux/irq.h>
  40 #include <asm/trace.h>
  41 #include <asm/fixed_code.h>
  42
  43 #ifdef CONFIG_KGDB
  44 # include <linux/debugger.h>
  45 # include <linux/kgdb.h>
  46
  47 # define CHK_DEBUGGER_TRAP() \
  48         do { \
  49                 CHK_DEBUGGER(trapnr, sig, info.si_code, fp, ); \
  50         } while (0)
  51 # define CHK_DEBUGGER_TRAP_MAYBE() \
  52         do { \
  53                 if (kgdb_connected) \
  54                         CHK_DEBUGGER_TRAP(); \
  55         } while (0)
  56 #else
  57 # define CHK_DEBUGGER_TRAP() do { } while (0)
  58 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  59 #endif
  60
  61 /* Initiate the event table handler */
  62 void __init trap_init(void)
  63 {
  64         CSYNC();
  65         bfin_write_EVT3(trap);
  66         CSYNC();
  67 }
  68
  69 int kstack_depth_to_print = 48;
  70
  71 static void decode_address(char *buf, unsigned long address)
  72 {
  73         struct vm_list_struct *vml;
  74         struct task_struct *p;
  75         struct mm_struct *mm;
  76         unsigned long flags, offset;
  77         unsigned int in_exception = bfin_read_IPEND() & 0x10;
  78
  79 #ifdef CONFIG_KALLSYMS
  80         unsigned long symsize;
  81         const char *symname;
  82         char *modname;
  83         char *delim = ":";
  84         char namebuf[128];
  85
  86         /* look up the address and see if we are in kernel space */
  87         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
  88
  89         if (symname) {
  90                 /* yeah! kernel space! */
  91                 if (!modname)
  92                         modname = delim = "";
  93                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
  94                               (void *)address, delim, modname, delim, symname,
  95                               (unsigned long)offset);
  96                 return;
  97
  98         }
  99 #endif
 100
 101         /* Problem in fixed code section? */
 102         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 103                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
 104                 return;
 105         }
 106
 107         /* Problem somewhere before the kernel start address */
 108         if (address < CONFIG_BOOT_LOAD) {
 109                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
 110                 return;
 111         }
 112
 113         /* looks like we're off in user-land, so let's walk all the
 114          * mappings of all our processes and see if we can't be a whee
 115          * bit more specific
 116          */
 117         write_lock_irqsave(&tasklist_lock, flags);
 118         for_each_process(p) {
 119                 mm = (in_exception ? p->mm : get_task_mm(p));
 120                 if (!mm)
 121                         continue;
 122
 123                 vml = mm->context.vmlist;
 124                 while (vml) {
 125                         struct vm_area_struct *vma = vml->vma;
 126
 127                         if (address >= vma->vm_start && address < vma->vm_end) {
 128                                 char *name = p->comm;
 129                                 struct file *file = vma->vm_file;
 130                                 if (file) {
 131                                         char _tmpbuf[256];
 132                                         name = d_path(file->f_dentry,
 133                                                       file->f_vfsmnt,
 134                                                       _tmpbuf,
 135                                                       sizeof(_tmpbuf));
 136                                 }
 137
 138                                 /* FLAT does not have its text aligned to the start of
 139                                  * the map while FDPIC ELF does ...
 140                                  */
 141                                 if (current->mm &&
 142                                     (address > current->mm->start_code) &&
 143                                     (address < current->mm->end_code))
 144                                         offset = address - current->mm->start_code;
 145                                 else
 146                                         offset = (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
 147
 148                                 sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 149                                         (void *)address, name, offset);
 150                                 if (!in_exception)
 151                                         mmput(mm);
 152                                 goto done;
 153                         }
 154
 155                         vml = vml->next;
 156                 }
 157                 if (!in_exception)
 158                         mmput(mm);
 159         }
 160
 161         /* we were unable to find this address anywhere */
 162         sprintf(buf, "<0x%p> /* unknown address */", (void *)address);
 163
 164 done:
 165         write_unlock_irqrestore(&tasklist_lock, flags);
 166 }
 167
 168 asmlinkage void double_fault_c(struct pt_regs *fp)
 169 {
 170         console_verbose();
 171         oops_in_progress = 1;
 172         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 173         dump_bfin_process(fp);
 174         dump_bfin_mem((void *)fp->retx);
 175         show_regs(fp);
 176         panic("Double Fault - unrecoverable event\n");
 177
 178 }
 179
 180 asmlinkage void trap_c(struct pt_regs *fp)
 181 {
 182 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 183         int j;
 184 #endif
 185         int sig = 0;
 186         siginfo_t info;
 187         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 188
 189         trace_buffer_save(j);
 190
 191         /* Important - be very careful dereferncing pointers - will lead to
 192          * double faults if the stack has become corrupt
 193          */
 194
 195         /* If the fault was caused by a kernel thread, or interrupt handler
 196          * we will kernel panic, so the system reboots.
 197          * If KGDB is enabled, don't set this for kernel breakpoints
 198         */
 199         if ((bfin_read_IPEND() & 0xFFC0)
 200 #ifdef CONFIG_KGDB
 201                 && trapnr != VEC_EXCPT02
 202 #endif
 203         ){
 204                 console_verbose();
 205                 oops_in_progress = 1;
 206         } else if (current) {
 207                 if (current->mm == NULL) {
 208                         console_verbose();
 209                         oops_in_progress = 1;
 210                 }
 211         }
 212
 213         /* trap_c() will be called for exceptions. During exceptions
 214          * processing, the pc value should be set with retx value.
 215          * With this change we can cleanup some code in signal.c- TODO
 216          */
 217         fp->orig_pc = fp->retx;
 218         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 219                 trapnr, fp->ipend, fp->pc, fp->retx); */
 220
 221         /* send the appropriate signal to the user program */
 222         switch (trapnr) {
 223
 224         /* This table works in conjuction with the one in ./mach-common/entry.S
 225          * Some exceptions are handled there (in assembly, in exception space)
 226          * Some are handled here, (in C, in interrupt space)
 227          * Some, like CPLB, are handled in both, where the normal path is
 228          * handled in assembly/exception space, and the error path is handled
 229          * here
 230          */
 231
 232         /* 0x00 - Linux Syscall, getting here is an error */
 233         /* 0x01 - userspace gdb breakpoint, handled here */
 234         case VEC_EXCPT01:
 235                 info.si_code = TRAP_ILLTRAP;
 236                 sig = SIGTRAP;
 237                 CHK_DEBUGGER_TRAP_MAYBE();
 238                 /* Check if this is a breakpoint in kernel space */
 239                 if (fp->ipend & 0xffc0)
 240                         return;
 241                 else
 242                         break;
 243 #ifdef CONFIG_KGDB
 244         case VEC_EXCPT02 :               /* gdb connection */
 245                 info.si_code = TRAP_ILLTRAP;
 246                 sig = SIGTRAP;
 247                 CHK_DEBUGGER_TRAP();
 248                 return;
 249 #else
 250         /* 0x02 - User Defined, Caught by default */
 251 #endif
 252         /* 0x03 - User Defined, userspace stack overflow */
 253         case VEC_EXCPT03:
 254                 info.si_code = SEGV_STACKFLOW;
 255                 sig = SIGSEGV;
 256                 printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
 257                 CHK_DEBUGGER_TRAP();
 258                 break;
 259         /* 0x04 - User Defined, Caught by default */
 260         /* 0x05 - User Defined, Caught by default */
 261         /* 0x06 - User Defined, Caught by default */
 262         /* 0x07 - User Defined, Caught by default */
 263         /* 0x08 - User Defined, Caught by default */
 264         /* 0x09 - User Defined, Caught by default */
 265         /* 0x0A - User Defined, Caught by default */
 266         /* 0x0B - User Defined, Caught by default */
 267         /* 0x0C - User Defined, Caught by default */
 268         /* 0x0D - User Defined, Caught by default */
 269         /* 0x0E - User Defined, Caught by default */
 270         /* 0x0F - User Defined, Caught by default */
 271         /* 0x10 HW Single step, handled here */
 272         case VEC_STEP:
 273                 info.si_code = TRAP_STEP;
 274                 sig = SIGTRAP;
 275                 CHK_DEBUGGER_TRAP_MAYBE();
 276                 /* Check if this is a single step in kernel space */
 277                 if (fp->ipend & 0xffc0)
 278                         return;
 279                 else
 280                         break;
 281         /* 0x11 - Trace Buffer Full, handled here */
 282         case VEC_OVFLOW:
 283                 info.si_code = TRAP_TRACEFLOW;
 284                 sig = SIGTRAP;
 285                 printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
 286                 CHK_DEBUGGER_TRAP();
 287                 break;
 288         /* 0x12 - Reserved, Caught by default */
 289         /* 0x13 - Reserved, Caught by default */
 290         /* 0x14 - Reserved, Caught by default */
 291         /* 0x15 - Reserved, Caught by default */
 292         /* 0x16 - Reserved, Caught by default */
 293         /* 0x17 - Reserved, Caught by default */
 294         /* 0x18 - Reserved, Caught by default */
 295         /* 0x19 - Reserved, Caught by default */
 296         /* 0x1A - Reserved, Caught by default */
 297         /* 0x1B - Reserved, Caught by default */
 298         /* 0x1C - Reserved, Caught by default */
 299         /* 0x1D - Reserved, Caught by default */
 300         /* 0x1E - Reserved, Caught by default */
 301         /* 0x1F - Reserved, Caught by default */
 302         /* 0x20 - Reserved, Caught by default */
 303         /* 0x21 - Undefined Instruction, handled here */
 304         case VEC_UNDEF_I:
 305                 info.si_code = ILL_ILLOPC;
 306                 sig = SIGILL;
 307                 printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
 308                 CHK_DEBUGGER_TRAP();
 309                 break;
 310         /* 0x22 - Illegal Instruction Combination, handled here */
 311         case VEC_ILGAL_I:
 312                 info.si_code = ILL_ILLPARAOP;
 313                 sig = SIGILL;
 314                 printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
 315                 CHK_DEBUGGER_TRAP();
 316                 break;
 317         /* 0x23 - Data CPLB protection violation, handled here */
 318         case VEC_CPLB_VL:
 319                 info.si_code = ILL_CPLB_VI;
 320                 sig = SIGBUS;
 321                 printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
 322                 CHK_DEBUGGER_TRAP();
 323                 break;
 324         /* 0x24 - Data access misaligned, handled here */
 325         case VEC_MISALI_D:
 326                 info.si_code = BUS_ADRALN;
 327                 sig = SIGBUS;
 328                 printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
 329                 CHK_DEBUGGER_TRAP();
 330                 break;
 331         /* 0x25 - Unrecoverable Event, handled here */
 332         case VEC_UNCOV:
 333                 info.si_code = ILL_ILLEXCPT;
 334                 sig = SIGILL;
 335                 printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
 336                 CHK_DEBUGGER_TRAP();
 337                 break;
 338         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 339                 error case is handled here */
 340         case VEC_CPLB_M:
 341                 info.si_code = BUS_ADRALN;
 342                 sig = SIGBUS;
 343                 printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
 344                 CHK_DEBUGGER_TRAP();
 345                 break;
 346         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 347         case VEC_CPLB_MHIT:
 348                 info.si_code = ILL_CPLB_MULHIT;
 349 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 350                 sig = SIGSEGV;
 351                 printk(KERN_NOTICE "NULL pointer access (probably)\n");
 352 #else
 353                 sig = SIGILL;
 354                 printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
 355 #endif
 356                 CHK_DEBUGGER_TRAP();
 357                 break;
 358         /* 0x28 - Emulation Watchpoint, handled here */
 359         case VEC_WATCH:
 360                 info.si_code = TRAP_WATCHPT;
 361                 sig = SIGTRAP;
 362                 pr_debug(EXC_0x28(KERN_DEBUG));
 363                 CHK_DEBUGGER_TRAP_MAYBE();
 364                 /* Check if this is a watchpoint in kernel space */
 365                 if (fp->ipend & 0xffc0)
 366                         return;
 367                 else
 368                         break;
 369 #ifdef CONFIG_BF535
 370         /* 0x29 - Instruction fetch access error (535 only) */
 371         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 372                 info.si_code = BUS_OPFETCH;
 373                 sig = SIGBUS;
 374                 printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 375                 CHK_DEBUGGER_TRAP();
 376                 break;
 377 #else
 378         /* 0x29 - Reserved, Caught by default */
 379 #endif
 380         /* 0x2A - Instruction fetch misaligned, handled here */
 381         case VEC_MISALI_I:
 382                 info.si_code = BUS_ADRALN;
 383                 sig = SIGBUS;
 384                 printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
 385                 CHK_DEBUGGER_TRAP();
 386                 break;
 387         /* 0x2B - Instruction CPLB protection violation, handled here */
 388         case VEC_CPLB_I_VL:
 389                 info.si_code = ILL_CPLB_VI;
 390                 sig = SIGBUS;
 391                 printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
 392                 CHK_DEBUGGER_TRAP();
 393                 break;
 394         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 395         case VEC_CPLB_I_M:
 396                 info.si_code = ILL_CPLB_MISS;
 397                 sig = SIGBUS;
 398                 printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
 399                 CHK_DEBUGGER_TRAP();
 400                 break;
 401         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 402         case VEC_CPLB_I_MHIT:
 403                 info.si_code = ILL_CPLB_MULHIT;
 404 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 405                 sig = SIGSEGV;
 406                 printk(KERN_NOTICE "Jump to address 0 - 0x0fff\n");
 407 #else
 408                 sig = SIGILL;
 409                 printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
 410 #endif
 411                 CHK_DEBUGGER_TRAP();
 412                 break;
 413         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 414         case VEC_ILL_RES:
 415                 info.si_code = ILL_PRVOPC;
 416                 sig = SIGILL;
 417                 printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
 418                 CHK_DEBUGGER_TRAP();
 419                 break;
 420         /* 0x2F - Reserved, Caught by default */
 421         /* 0x30 - Reserved, Caught by default */
 422         /* 0x31 - Reserved, Caught by default */
 423         /* 0x32 - Reserved, Caught by default */
 424         /* 0x33 - Reserved, Caught by default */
 425         /* 0x34 - Reserved, Caught by default */
 426         /* 0x35 - Reserved, Caught by default */
 427         /* 0x36 - Reserved, Caught by default */
 428         /* 0x37 - Reserved, Caught by default */
 429         /* 0x38 - Reserved, Caught by default */
 430         /* 0x39 - Reserved, Caught by default */
 431         /* 0x3A - Reserved, Caught by default */
 432         /* 0x3B - Reserved, Caught by default */
 433         /* 0x3C - Reserved, Caught by default */
 434         /* 0x3D - Reserved, Caught by default */
 435         /* 0x3E - Reserved, Caught by default */
 436         /* 0x3F - Reserved, Caught by default */
 437         case VEC_HWERR:
 438                 info.si_code = BUS_ADRALN;
 439                 sig = SIGBUS;
 440                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 441                 /* System MMR Error */
 442                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 443                         info.si_code = BUS_ADRALN;
 444                         sig = SIGBUS;
 445                         printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
 446                         break;
 447                 /* External Memory Addressing Error */
 448                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 449                         info.si_code = BUS_ADRERR;
 450                         sig = SIGBUS;
 451                         printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
 452                         break;
 453                 /* Performance Monitor Overflow */
 454                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 455                         printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
 456                         break;
 457                 /* RAISE 5 instruction */
 458                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 459                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 460                         break;
 461                 default:        /* Reserved */
 462                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 463                         break;
 464                 }
 465                 CHK_DEBUGGER_TRAP();
 466                 break;
 467         default:
 468                 info.si_code = TRAP_ILLTRAP;
 469                 sig = SIGTRAP;
 470                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 471                         (fp->seqstat & SEQSTAT_EXCAUSE));
 472                 CHK_DEBUGGER_TRAP();
 473                 break;
 474         }
 475
 476         BUG_ON(sig == 0);
 477
 478         if (sig != SIGTRAP) {
 479                 unsigned long stack;
 480                 dump_bfin_process(fp);
 481                 /* Is it an interrupt, or an exception? */
 482                 if (trapnr == VEC_HWERR)
 483                         dump_bfin_mem((void *)fp->pc);
 484                 else
 485                         dump_bfin_mem((void *)fp->retx);
 486                 show_regs(fp);
 487
 488                 /* Print out the trace buffer if it makes sense */
 489 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 490                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 491                         printk(KERN_NOTICE "No trace since you do not have "
 492                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 493                                 KERN_NOTICE "\n");
 494                 else
 495 #endif
 496                         dump_bfin_trace_buffer();
 497                 show_stack(current, &stack);
 498                 if (oops_in_progress) {
 499 #ifndef CONFIG_ACCESS_CHECK
 500                         printk(KERN_EMERG "Please turn on "
 501                                "CONFIG_ACCESS_CHECK\n");
 502 #endif
 503                         panic("Kernel exception");
 504                 }
 505         }
 506
 507         info.si_signo = sig;
 508         info.si_errno = 0;
 509         info.si_addr = (void *)fp->pc;
 510         force_sig_info(sig, &info, current);
 511
 512         trace_buffer_restore(j);
 513         return;
 514 }
 515
 516 /* Typical exception handling routines  */
 517
 518 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 519
 520 void dump_bfin_trace_buffer(void)
 521 {
 522 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 523         int tflags, i = 0;
 524         char buf[150];
 525 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 526         int j, index;
 527 #endif
 528
 529         trace_buffer_save(tflags);
 530
 531         printk(KERN_NOTICE "Hardware Trace:\n");
 532
 533         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 534                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 535                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 536                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 537                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 538                         printk(KERN_NOTICE "     Source : %s\n", buf);
 539                 }
 540         }
 541
 542 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 543         if (trace_buff_offset)
 544                 index = trace_buff_offset/4 - 1;
 545         else
 546                 index = EXPAND_LEN;
 547
 548         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 549         while (j) {
 550                 decode_address(buf, software_trace_buff[index]);
 551                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 552                 index -= 1;
 553                 if (index < 0 )
 554                         index = EXPAND_LEN;
 555                 decode_address(buf, software_trace_buff[index]);
 556                 printk(KERN_NOTICE "     Source : %s\n", buf);
 557                 index -= 1;
 558                 if (index < 0)
 559                         index = EXPAND_LEN;
 560                 j--;
 561                 i++;
 562         }
 563 #endif
 564
 565         trace_buffer_restore(tflags);
 566 #endif
 567 }
 568 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 569
 570 static void show_trace(struct task_struct *tsk, unsigned long *sp)
 571 {
 572         unsigned long addr;
 573
 574         printk(KERN_NOTICE "\n" KERN_NOTICE "Call Trace:\n");
 575
 576         while (!kstack_end(sp)) {
 577                 addr = *sp++;
 578                 /*
 579                  * If the address is either in the text segment of the
 580                  * kernel, or in the region which contains vmalloc'ed
 581                  * memory, it *may* be the address of a calling
 582                  * routine; if so, print it so that someone tracing
 583                  * down the cause of the crash will be able to figure
 584                  * out the call path that was taken.
 585                  */
 586                 if (kernel_text_address(addr))
 587                         print_ip_sym(addr);
 588         }
 589
 590         printk(KERN_NOTICE "\n");
 591 }
 592
 593 void show_stack(struct task_struct *task, unsigned long *stack)
 594 {
 595         unsigned long *endstack, addr;
 596         int i;
 597
 598         /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
 599          * called externally in some places in the kernel.
 600          */
 601
 602         if (!stack) {
 603                 if (task)
 604                         stack = (unsigned long *)task->thread.ksp;
 605                 else
 606                         stack = (unsigned long *)&stack;
 607         }
 608
 609         addr = (unsigned long)stack;
 610         endstack = (unsigned long *)PAGE_ALIGN(addr);
 611
 612         printk(KERN_NOTICE "Stack from %08lx:", (unsigned long)stack);
 613         for (i = 0; i < kstack_depth_to_print; i++) {
 614                 if (stack + 1 > endstack)
 615                         break;
 616                 if (i % 8 == 0)
 617                         printk("\n" KERN_NOTICE "       ");
 618                 printk(" %08lx", *stack++);
 619         }
 620         printk("\n");
 621
 622         show_trace(task, stack);
 623 }
 624
 625 void dump_stack(void)
 626 {
 627         unsigned long stack;
 628 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 629         int tflags;
 630 #endif
 631         trace_buffer_save(tflags);
 632         dump_bfin_trace_buffer();
 633         show_stack(current, &stack);
 634         trace_buffer_restore(tflags);
 635 }
 636 EXPORT_SYMBOL(dump_stack);
 637
 638 void dump_bfin_process(struct pt_regs *fp)
 639 {
 640         /* We should be able to look at fp->ipend, but we don't push it on the
 641          * stack all the time, so do this until we fix that */
 642         unsigned int context = bfin_read_IPEND();
 643
 644         if (oops_in_progress)
 645                 printk(KERN_EMERG "Kernel OOPS in progress\n");
 646
 647         if (context & 0x0020)
 648                 printk(KERN_NOTICE "Deferred excecption or HW Error context\n");
 649         else if (context & 0x3FC0)
 650                 printk(KERN_NOTICE "Interrupt context\n");
 651         else if (context & 0x4000)
 652                 printk(KERN_NOTICE "Deferred Interrupt context\n");
 653         else if (context & 0x8000)
 654                 printk(KERN_NOTICE "Kernel process context\n");
 655
 656         if (current->pid && current->mm) {
 657                 printk(KERN_NOTICE "CURRENT PROCESS:\n");
 658                 printk(KERN_NOTICE "COMM=%s PID=%d\n",
 659                         current->comm, current->pid);
 660
 661                 printk(KERN_NOTICE "TEXT = 0x%p-0x%p  DATA = 0x%p-0x%p\n"
 662                         KERN_NOTICE "BSS = 0x%p-0x%p   USER-STACK = 0x%p\n"
 663                         KERN_NOTICE "\n",
 664                         (void *)current->mm->start_code,
 665                         (void *)current->mm->end_code,
 666                         (void *)current->mm->start_data,
 667                         (void *)current->mm->end_data,
 668                         (void *)current->mm->end_data,
 669                         (void *)current->mm->brk,
 670                         (void *)current->mm->start_stack);
 671         } else
 672                 printk(KERN_NOTICE "\n" KERN_NOTICE
 673                      "No Valid process in current context\n");
 674 }
 675
 676 void dump_bfin_mem(void *retaddr)
 677 {
 678
 679         if (retaddr >= (void *)FIXED_CODE_START  && retaddr < (void *)physical_mem_end
 680 #if L1_CODE_LENGTH != 0
 681             /* FIXME: Copy the code out of L1 Instruction SRAM through dma
 682                memcpy.  */
 683             && !(retaddr >= (void *)L1_CODE_START
 684                  && retaddr < (void *)(L1_CODE_START + L1_CODE_LENGTH))
 685 #endif
 686         ) {
 687                 int i = ((unsigned int)retaddr & 0xFFFFFFF0) - 32;
 688                 unsigned short x = 0;
 689                 printk(KERN_NOTICE "return address: [0x%p]; contents of:", retaddr);
 690                 for (; i < ((unsigned int)retaddr & 0xFFFFFFF0) + 32; i += 2) {
 691                         if (!(i & 0xF))
 692                                 printk("\n" KERN_NOTICE "0x%08x: ", i);
 693
 694                         if (get_user(x, (unsigned short *)i))
 695                                 break;
 696 #ifndef CONFIG_DEBUG_HWERR
 697                         /* If one of the last few instructions was a STI
 698                          * it is likely that the error occured awhile ago
 699                          * and we just noticed. This only happens in kernel
 700                          * context, which should mean an oops is happening
 701                          */
 702                         if (oops_in_progress && x >= 0x0040 && x <= 0x0047 && i <= 0)
 703                                 printk(KERN_EMERG "\n"
 704                                         KERN_EMERG "WARNING : You should reconfigure"
 705                                         " the kernel to turn on\n"
 706                                         KERN_EMERG " 'Hardware error interrupt debugging'\n"
 707                                         KERN_EMERG " The rest of this error is meanless\n");
 708 #endif
 709                         if (i == (unsigned int)retaddr)
 710                                 printk("[%04x]", x);
 711                         else
 712                                 printk(" %04x ", x);
 713                 }
 714                 printk("\n");
 715         } else
 716                 printk("\n" KERN_NOTICE
 717                         "Cannot look at the [PC] <%p> for it is"
 718                         " in unreadable memory - sorry\n", retaddr);
 719 }
 720
 721 void show_regs(struct pt_regs *fp)
 722 {
 723         char buf [150];
 724         struct irqaction *action;
 725         unsigned int i;
 726         unsigned long flags;
 727
 728         printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\n");
 729         printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
 730                 (long)fp->seqstat, fp->ipend, fp->syscfg);
 731         printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
 732                 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
 733         printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
 734                 fp->seqstat & SEQSTAT_EXCAUSE);
 735         for (i = 6; i <= 15 ; i++) {
 736                 if (fp->ipend & (1 << i)) {
 737                         decode_address(buf, bfin_read32(EVT0 + 4*i));
 738                         printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
 739                 }
 740         }
 741
 742         /* if no interrupts are going off, don't print this out */
 743         if (fp->ipend & ~0x3F) {
 744                 for (i = 0; i < (NR_IRQS - 1); i++) {
 745                         spin_lock_irqsave(&irq_desc[i].lock, flags);
 746                         action = irq_desc[i].action;
 747                         if (!action)
 748                                 goto unlock;
 749
 750                         decode_address(buf, (unsigned int)action->handler);
 751                         printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
 752                         for (action = action->next; action; action = action->next) {
 753                                 decode_address(buf, (unsigned int)action->handler);
 754                                 printk(", %s", buf);
 755                         }
 756                         printk("\n");
 757 unlock:
 758                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 759                 }
 760         }
 761
 762         decode_address(buf, fp->rete);
 763         printk(KERN_NOTICE " RETE: %s\n", buf);
 764         decode_address(buf, fp->retn);
 765         printk(KERN_NOTICE " RETN: %s\n", buf);
 766         decode_address(buf, fp->retx);
 767         printk(KERN_NOTICE " RETX: %s\n", buf);
 768         decode_address(buf, fp->rets);
 769         printk(KERN_NOTICE " RETS: %s\n", buf);
 770         decode_address(buf, fp->pc);
 771         printk(KERN_NOTICE " PC  : %s\n", buf);
 772
 773         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
 774             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
 775                 decode_address(buf, bfin_read_DCPLB_FAULT_ADDR());
 776                 printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
 777                 decode_address(buf, bfin_read_ICPLB_FAULT_ADDR());
 778                 printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
 779         }
 780
 781         printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
 782         printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
 783                 fp->r0, fp->r1, fp->r2, fp->r3);
 784         printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
 785                 fp->r4, fp->r5, fp->r6, fp->r7);
 786         printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
 787                 fp->p0, fp->p1, fp->p2, fp->p3);
 788         printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
 789                 fp->p4, fp->p5, fp->fp, (long)fp);
 790         printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
 791                 fp->lb0, fp->lt0, fp->lc0);
 792         printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
 793                 fp->lb1, fp->lt1, fp->lc1);
 794         printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
 795                 fp->b0, fp->l0, fp->m0, fp->i0);
 796         printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
 797                 fp->b1, fp->l1, fp->m1, fp->i1);
 798         printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
 799                 fp->b2, fp->l2, fp->m2, fp->i2);
 800         printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
 801                 fp->b3, fp->l3, fp->m3, fp->i3);
 802         printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
 803                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
 804
 805         printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
 806                 rdusp(), fp->astat);
 807
 808         printk(KERN_NOTICE "\n");
 809 }
 810
 811 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
 812 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
 813 #endif
 814
 815 asmlinkage int sys_bfin_spinlock(int *spinlock)
 816 {
 817         int ret = 0;
 818         int tmp = 0;
 819
 820         local_irq_disable();
 821         ret = get_user(tmp, spinlock);
 822         if (ret == 0) {
 823                 if (tmp)
 824                         ret = 1;
 825                 tmp = 1;
 826                 put_user(tmp, spinlock);
 827         }
 828         local_irq_enable();
 829         return ret;
 830 }
 831
 832 int bfin_request_exception(unsigned int exception, void (*handler)(void))
 833 {
 834         void (*curr_handler)(void);
 835
 836         if (exception > 0x3F)
 837                 return -EINVAL;
 838
 839         curr_handler = ex_table[exception];
 840
 841         if (curr_handler != ex_replaceable)
 842                 return -EBUSY;
 843
 844         ex_table[exception] = handler;
 845
 846         return 0;
 847 }
 848 EXPORT_SYMBOL(bfin_request_exception);
 849
 850 int bfin_free_exception(unsigned int exception, void (*handler)(void))
 851 {
 852         void (*curr_handler)(void);
 853
 854         if (exception > 0x3F)
 855                 return -EINVAL;
 856
 857         curr_handler = ex_table[exception];
 858
 859         if (curr_handler != handler)
 860                 return -EBUSY;
 861
 862         ex_table[exception] = ex_replaceable;
 863
 864         return 0;
 865 }
 866 EXPORT_SYMBOL(bfin_free_exception);
 867
 868 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
 869 {
 870         switch (cplb_panic) {
 871         case CPLB_NO_UNLOCKED:
 872                 printk(KERN_EMERG "All CPLBs are locked\n");
 873                 break;
 874         case CPLB_PROT_VIOL:
 875                 return;
 876         case CPLB_NO_ADDR_MATCH:
 877                 return;
 878         case CPLB_UNKNOWN_ERR:
 879                 printk(KERN_EMERG "Unknown CPLB Exception\n");
 880                 break;
 881         }
 882
 883         oops_in_progress = 1;
 884
 885         printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void *)bfin_read_DCPLB_FAULT_ADDR());
 886         printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void *)bfin_read_ICPLB_FAULT_ADDR());
 887         dump_bfin_process(fp);
 888         dump_bfin_mem((void *)fp->retx);
 889         show_regs(fp);
 890         dump_stack();
 891         panic("Unrecoverable event\n");
 892 }