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 #include <asm/dma.h>
  43
  44 #ifdef CONFIG_KGDB
  45 # include <linux/debugger.h>
  46 # include <linux/kgdb.h>
  47
  48 # define CHK_DEBUGGER_TRAP() \
  49         do { \
  50                 CHK_DEBUGGER(trapnr, sig, info.si_code, fp, ); \
  51         } while (0)
  52 # define CHK_DEBUGGER_TRAP_MAYBE() \
  53         do { \
  54                 if (kgdb_connected) \
  55                         CHK_DEBUGGER_TRAP(); \
  56         } while (0)
  57 #else
  58 # define CHK_DEBUGGER_TRAP() do { } while (0)
  59 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
  60 #endif
  61
  62 /* Initiate the event table handler */
  63 void __init trap_init(void)
  64 {
  65         CSYNC();
  66         bfin_write_EVT3(trap);
  67         CSYNC();
  68 }
  69
  70 int kstack_depth_to_print = 48;
  71
  72 static void decode_address(char *buf, unsigned long address)
  73 {
  74         struct vm_list_struct *vml;
  75         struct task_struct *p;
  76         struct mm_struct *mm;
  77         unsigned long flags, offset;
  78         unsigned int in_exception = bfin_read_IPEND() & 0x10;
  79
  80 #ifdef CONFIG_KALLSYMS
  81         unsigned long symsize;
  82         const char *symname;
  83         char *modname;
  84         char *delim = ":";
  85         char namebuf[128];
  86
  87         /* look up the address and see if we are in kernel space */
  88         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
  89
  90         if (symname) {
  91                 /* yeah! kernel space! */
  92                 if (!modname)
  93                         modname = delim = "";
  94                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
  95                               (void *)address, delim, modname, delim, symname,
  96                               (unsigned long)offset);
  97                 return;
  98
  99         }
 100 #endif
 101
 102         /* Problem in fixed code section? */
 103         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 104                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
 105                 return;
 106         }
 107
 108         /* Problem somewhere before the kernel start address */
 109         if (address < CONFIG_BOOT_LOAD) {
 110                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
 111                 return;
 112         }
 113
 114         /* looks like we're off in user-land, so let's walk all the
 115          * mappings of all our processes and see if we can't be a whee
 116          * bit more specific
 117          */
 118         write_lock_irqsave(&tasklist_lock, flags);
 119         for_each_process(p) {
 120                 mm = (in_exception ? p->mm : get_task_mm(p));
 121                 if (!mm)
 122                         continue;
 123
 124                 vml = mm->context.vmlist;
 125                 while (vml) {
 126                         struct vm_area_struct *vma = vml->vma;
 127
 128                         if (address >= vma->vm_start && address < vma->vm_end) {
 129                                 char *name = p->comm;
 130                                 struct file *file = vma->vm_file;
 131                                 if (file) {
 132                                         char _tmpbuf[256];
 133                                         name = d_path(file->f_dentry,
 134                                                       file->f_vfsmnt,
 135                                                       _tmpbuf,
 136                                                       sizeof(_tmpbuf));
 137                                 }
 138
 139                                 /* FLAT does not have its text aligned to the start of
 140                                  * the map while FDPIC ELF does ...
 141                                  */
 142                                 if (current->mm &&
 143                                     (address > current->mm->start_code) &&
 144                                     (address < current->mm->end_code))
 145                                         offset = address - current->mm->start_code;
 146                                 else
 147                                         offset = (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
 148
 149                                 sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 150                                         (void *)address, name, offset);
 151                                 if (!in_exception)
 152                                         mmput(mm);
 153                                 goto done;
 154                         }
 155
 156                         vml = vml->next;
 157                 }
 158                 if (!in_exception)
 159                         mmput(mm);
 160         }
 161
 162         /* we were unable to find this address anywhere */
 163         sprintf(buf, "<0x%p> /* unknown address */", (void *)address);
 164
 165 done:
 166         write_unlock_irqrestore(&tasklist_lock, flags);
 167 }
 168
 169 asmlinkage void double_fault_c(struct pt_regs *fp)
 170 {
 171         console_verbose();
 172         oops_in_progress = 1;
 173         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 174         dump_bfin_process(fp);
 175         dump_bfin_mem(fp);
 176         show_regs(fp);
 177         panic("Double Fault - unrecoverable event\n");
 178
 179 }
 180
 181 asmlinkage void trap_c(struct pt_regs *fp)
 182 {
 183 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 184         int j;
 185 #endif
 186         int sig = 0;
 187         siginfo_t info;
 188         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 189
 190         trace_buffer_save(j);
 191
 192         /* Important - be very careful dereferncing pointers - will lead to
 193          * double faults if the stack has become corrupt
 194          */
 195
 196         /* If the fault was caused by a kernel thread, or interrupt handler
 197          * we will kernel panic, so the system reboots.
 198          * If KGDB is enabled, don't set this for kernel breakpoints
 199         */
 200
 201         /* TODO: check to see if we are in some sort of deferred HWERR
 202          * that we should be able to recover from, not kernel panic
 203          */
 204         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
 205 #ifdef CONFIG_KGDB
 206                 && (trapnr != VEC_EXCPT02)
 207 #endif
 208         ){
 209                 console_verbose();
 210                 oops_in_progress = 1;
 211         } else if (current) {
 212                 if (current->mm == NULL) {
 213                         console_verbose();
 214                         oops_in_progress = 1;
 215                 }
 216         }
 217
 218         /* trap_c() will be called for exceptions. During exceptions
 219          * processing, the pc value should be set with retx value.
 220          * With this change we can cleanup some code in signal.c- TODO
 221          */
 222         fp->orig_pc = fp->retx;
 223         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 224                 trapnr, fp->ipend, fp->pc, fp->retx); */
 225
 226         /* send the appropriate signal to the user program */
 227         switch (trapnr) {
 228
 229         /* This table works in conjuction with the one in ./mach-common/entry.S
 230          * Some exceptions are handled there (in assembly, in exception space)
 231          * Some are handled here, (in C, in interrupt space)
 232          * Some, like CPLB, are handled in both, where the normal path is
 233          * handled in assembly/exception space, and the error path is handled
 234          * here
 235          */
 236
 237         /* 0x00 - Linux Syscall, getting here is an error */
 238         /* 0x01 - userspace gdb breakpoint, handled here */
 239         case VEC_EXCPT01:
 240                 info.si_code = TRAP_ILLTRAP;
 241                 sig = SIGTRAP;
 242                 CHK_DEBUGGER_TRAP_MAYBE();
 243                 /* Check if this is a breakpoint in kernel space */
 244                 if (fp->ipend & 0xffc0)
 245                         return;
 246                 else
 247                         break;
 248 #ifdef CONFIG_KGDB
 249         case VEC_EXCPT02 :               /* gdb connection */
 250                 info.si_code = TRAP_ILLTRAP;
 251                 sig = SIGTRAP;
 252                 CHK_DEBUGGER_TRAP();
 253                 return;
 254 #else
 255         /* 0x02 - User Defined, Caught by default */
 256 #endif
 257         /* 0x03 - User Defined, userspace stack overflow */
 258         case VEC_EXCPT03:
 259                 info.si_code = SEGV_STACKFLOW;
 260                 sig = SIGSEGV;
 261                 printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
 262                 CHK_DEBUGGER_TRAP();
 263                 break;
 264         /* 0x04 - User Defined, Caught by default */
 265         /* 0x05 - User Defined, Caught by default */
 266         /* 0x06 - User Defined, Caught by default */
 267         /* 0x07 - User Defined, Caught by default */
 268         /* 0x08 - User Defined, Caught by default */
 269         /* 0x09 - User Defined, Caught by default */
 270         /* 0x0A - User Defined, Caught by default */
 271         /* 0x0B - User Defined, Caught by default */
 272         /* 0x0C - User Defined, Caught by default */
 273         /* 0x0D - User Defined, Caught by default */
 274         /* 0x0E - User Defined, Caught by default */
 275         /* 0x0F - User Defined, Caught by default */
 276         /* 0x10 HW Single step, handled here */
 277         case VEC_STEP:
 278                 info.si_code = TRAP_STEP;
 279                 sig = SIGTRAP;
 280                 CHK_DEBUGGER_TRAP_MAYBE();
 281                 /* Check if this is a single step in kernel space */
 282                 if (fp->ipend & 0xffc0)
 283                         return;
 284                 else
 285                         break;
 286         /* 0x11 - Trace Buffer Full, handled here */
 287         case VEC_OVFLOW:
 288                 info.si_code = TRAP_TRACEFLOW;
 289                 sig = SIGTRAP;
 290                 printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
 291                 CHK_DEBUGGER_TRAP();
 292                 break;
 293         /* 0x12 - Reserved, Caught by default */
 294         /* 0x13 - Reserved, Caught by default */
 295         /* 0x14 - Reserved, Caught by default */
 296         /* 0x15 - Reserved, Caught by default */
 297         /* 0x16 - Reserved, Caught by default */
 298         /* 0x17 - Reserved, Caught by default */
 299         /* 0x18 - Reserved, Caught by default */
 300         /* 0x19 - Reserved, Caught by default */
 301         /* 0x1A - Reserved, Caught by default */
 302         /* 0x1B - Reserved, Caught by default */
 303         /* 0x1C - Reserved, Caught by default */
 304         /* 0x1D - Reserved, Caught by default */
 305         /* 0x1E - Reserved, Caught by default */
 306         /* 0x1F - Reserved, Caught by default */
 307         /* 0x20 - Reserved, Caught by default */
 308         /* 0x21 - Undefined Instruction, handled here */
 309         case VEC_UNDEF_I:
 310                 info.si_code = ILL_ILLOPC;
 311                 sig = SIGILL;
 312                 printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
 313                 CHK_DEBUGGER_TRAP();
 314                 break;
 315         /* 0x22 - Illegal Instruction Combination, handled here */
 316         case VEC_ILGAL_I:
 317                 info.si_code = ILL_ILLPARAOP;
 318                 sig = SIGILL;
 319                 printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
 320                 CHK_DEBUGGER_TRAP();
 321                 break;
 322         /* 0x23 - Data CPLB protection violation, handled here */
 323         case VEC_CPLB_VL:
 324                 info.si_code = ILL_CPLB_VI;
 325                 sig = SIGBUS;
 326                 printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
 327                 CHK_DEBUGGER_TRAP();
 328                 break;
 329         /* 0x24 - Data access misaligned, handled here */
 330         case VEC_MISALI_D:
 331                 info.si_code = BUS_ADRALN;
 332                 sig = SIGBUS;
 333                 printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
 334                 CHK_DEBUGGER_TRAP();
 335                 break;
 336         /* 0x25 - Unrecoverable Event, handled here */
 337         case VEC_UNCOV:
 338                 info.si_code = ILL_ILLEXCPT;
 339                 sig = SIGILL;
 340                 printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
 341                 CHK_DEBUGGER_TRAP();
 342                 break;
 343         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 344                 error case is handled here */
 345         case VEC_CPLB_M:
 346                 info.si_code = BUS_ADRALN;
 347                 sig = SIGBUS;
 348                 printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
 349                 CHK_DEBUGGER_TRAP();
 350                 break;
 351         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 352         case VEC_CPLB_MHIT:
 353                 info.si_code = ILL_CPLB_MULHIT;
 354 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 355                 sig = SIGSEGV;
 356                 printk(KERN_NOTICE "NULL pointer access (probably)\n");
 357 #else
 358                 sig = SIGILL;
 359                 printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
 360 #endif
 361                 CHK_DEBUGGER_TRAP();
 362                 break;
 363         /* 0x28 - Emulation Watchpoint, handled here */
 364         case VEC_WATCH:
 365                 info.si_code = TRAP_WATCHPT;
 366                 sig = SIGTRAP;
 367                 pr_debug(EXC_0x28(KERN_DEBUG));
 368                 CHK_DEBUGGER_TRAP_MAYBE();
 369                 /* Check if this is a watchpoint in kernel space */
 370                 if (fp->ipend & 0xffc0)
 371                         return;
 372                 else
 373                         break;
 374 #ifdef CONFIG_BF535
 375         /* 0x29 - Instruction fetch access error (535 only) */
 376         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 377                 info.si_code = BUS_OPFETCH;
 378                 sig = SIGBUS;
 379                 printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 380                 CHK_DEBUGGER_TRAP();
 381                 break;
 382 #else
 383         /* 0x29 - Reserved, Caught by default */
 384 #endif
 385         /* 0x2A - Instruction fetch misaligned, handled here */
 386         case VEC_MISALI_I:
 387                 info.si_code = BUS_ADRALN;
 388                 sig = SIGBUS;
 389                 printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
 390                 CHK_DEBUGGER_TRAP();
 391                 break;
 392         /* 0x2B - Instruction CPLB protection violation, handled here */
 393         case VEC_CPLB_I_VL:
 394                 info.si_code = ILL_CPLB_VI;
 395                 sig = SIGBUS;
 396                 printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
 397                 CHK_DEBUGGER_TRAP();
 398                 break;
 399         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 400         case VEC_CPLB_I_M:
 401                 info.si_code = ILL_CPLB_MISS;
 402                 sig = SIGBUS;
 403                 printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
 404                 CHK_DEBUGGER_TRAP();
 405                 break;
 406         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 407         case VEC_CPLB_I_MHIT:
 408                 info.si_code = ILL_CPLB_MULHIT;
 409 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 410                 sig = SIGSEGV;
 411                 printk(KERN_NOTICE "Jump to address 0 - 0x0fff\n");
 412 #else
 413                 sig = SIGILL;
 414                 printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
 415 #endif
 416                 CHK_DEBUGGER_TRAP();
 417                 break;
 418         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 419         case VEC_ILL_RES:
 420                 info.si_code = ILL_PRVOPC;
 421                 sig = SIGILL;
 422                 printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
 423                 CHK_DEBUGGER_TRAP();
 424                 break;
 425         /* 0x2F - Reserved, Caught by default */
 426         /* 0x30 - Reserved, Caught by default */
 427         /* 0x31 - Reserved, Caught by default */
 428         /* 0x32 - Reserved, Caught by default */
 429         /* 0x33 - Reserved, Caught by default */
 430         /* 0x34 - Reserved, Caught by default */
 431         /* 0x35 - Reserved, Caught by default */
 432         /* 0x36 - Reserved, Caught by default */
 433         /* 0x37 - Reserved, Caught by default */
 434         /* 0x38 - Reserved, Caught by default */
 435         /* 0x39 - Reserved, Caught by default */
 436         /* 0x3A - Reserved, Caught by default */
 437         /* 0x3B - Reserved, Caught by default */
 438         /* 0x3C - Reserved, Caught by default */
 439         /* 0x3D - Reserved, Caught by default */
 440         /* 0x3E - Reserved, Caught by default */
 441         /* 0x3F - Reserved, Caught by default */
 442         case VEC_HWERR:
 443                 info.si_code = BUS_ADRALN;
 444                 sig = SIGBUS;
 445                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 446                 /* System MMR Error */
 447                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 448                         info.si_code = BUS_ADRALN;
 449                         sig = SIGBUS;
 450                         printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
 451                         break;
 452                 /* External Memory Addressing Error */
 453                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 454                         info.si_code = BUS_ADRERR;
 455                         sig = SIGBUS;
 456                         printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
 457                         break;
 458                 /* Performance Monitor Overflow */
 459                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 460                         printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
 461                         break;
 462                 /* RAISE 5 instruction */
 463                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 464                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 465                         break;
 466                 default:        /* Reserved */
 467                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 468                         break;
 469                 }
 470                 CHK_DEBUGGER_TRAP();
 471                 break;
 472         default:
 473                 info.si_code = TRAP_ILLTRAP;
 474                 sig = SIGTRAP;
 475                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 476                         (fp->seqstat & SEQSTAT_EXCAUSE));
 477                 CHK_DEBUGGER_TRAP();
 478                 break;
 479         }
 480
 481         BUG_ON(sig == 0);
 482
 483         if (sig != SIGTRAP) {
 484                 unsigned long stack;
 485                 dump_bfin_process(fp);
 486                 dump_bfin_mem(fp);
 487                 show_regs(fp);
 488
 489                 /* Print out the trace buffer if it makes sense */
 490 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 491                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 492                         printk(KERN_NOTICE "No trace since you do not have "
 493                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 494                                 KERN_NOTICE "\n");
 495                 else
 496 #endif
 497                         dump_bfin_trace_buffer();
 498                 show_stack(current, &stack);
 499                 if (oops_in_progress) {
 500                         print_modules();
 501 #ifndef CONFIG_ACCESS_CHECK
 502                         printk(KERN_EMERG "Please turn on "
 503                                "CONFIG_ACCESS_CHECK\n");
 504 #endif
 505                         panic("Kernel exception");
 506                 }
 507         }
 508
 509         info.si_signo = sig;
 510         info.si_errno = 0;
 511         info.si_addr = (void *)fp->pc;
 512         force_sig_info(sig, &info, current);
 513
 514         trace_buffer_restore(j);
 515         return;
 516 }
 517
 518 /* Typical exception handling routines  */
 519
 520 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 521
 522 void dump_bfin_trace_buffer(void)
 523 {
 524 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 525         int tflags, i = 0;
 526         char buf[150];
 527 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 528         int j, index;
 529 #endif
 530
 531         trace_buffer_save(tflags);
 532
 533         printk(KERN_NOTICE "Hardware Trace:\n");
 534
 535         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 536                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 537                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 538                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 539                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 540                         printk(KERN_NOTICE "     Source : %s\n", buf);
 541                 }
 542         }
 543
 544 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 545         if (trace_buff_offset)
 546                 index = trace_buff_offset/4 - 1;
 547         else
 548                 index = EXPAND_LEN;
 549
 550         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 551         while (j) {
 552                 decode_address(buf, software_trace_buff[index]);
 553                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 554                 index -= 1;
 555                 if (index < 0 )
 556                         index = EXPAND_LEN;
 557                 decode_address(buf, software_trace_buff[index]);
 558                 printk(KERN_NOTICE "     Source : %s\n", buf);
 559                 index -= 1;
 560                 if (index < 0)
 561                         index = EXPAND_LEN;
 562                 j--;
 563                 i++;
 564         }
 565 #endif
 566
 567         trace_buffer_restore(tflags);
 568 #endif
 569 }
 570 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 571
 572 static void show_trace(struct task_struct *tsk, unsigned long *sp)
 573 {
 574         unsigned long addr;
 575
 576         printk(KERN_NOTICE "\n" KERN_NOTICE "Call Trace:\n");
 577
 578         while (!kstack_end(sp)) {
 579                 addr = *sp++;
 580                 /*
 581                  * If the address is either in the text segment of the
 582                  * kernel, or in the region which contains vmalloc'ed
 583                  * memory, it *may* be the address of a calling
 584                  * routine; if so, print it so that someone tracing
 585                  * down the cause of the crash will be able to figure
 586                  * out the call path that was taken.
 587                  */
 588                 if (kernel_text_address(addr))
 589                         print_ip_sym(addr);
 590         }
 591
 592         printk(KERN_NOTICE "\n");
 593 }
 594
 595 void show_stack(struct task_struct *task, unsigned long *stack)
 596 {
 597         unsigned long *endstack, addr;
 598         int i;
 599
 600         /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
 601          * called externally in some places in the kernel.
 602          */
 603
 604         if (!stack) {
 605                 if (task)
 606                         stack = (unsigned long *)task->thread.ksp;
 607                 else
 608                         stack = (unsigned long *)&stack;
 609         }
 610
 611         addr = (unsigned long)stack;
 612         endstack = (unsigned long *)PAGE_ALIGN(addr);
 613
 614         printk(KERN_NOTICE "Stack from %08lx:", (unsigned long)stack);
 615         for (i = 0; i < kstack_depth_to_print; i++) {
 616                 if (stack + 1 > endstack)
 617                         break;
 618                 if (i % 8 == 0)
 619                         printk("\n" KERN_NOTICE "       ");
 620                 printk(" %08lx", *stack++);
 621         }
 622         printk("\n");
 623
 624         show_trace(task, stack);
 625 }
 626
 627 void dump_stack(void)
 628 {
 629         unsigned long stack;
 630 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 631         int tflags;
 632 #endif
 633         trace_buffer_save(tflags);
 634         dump_bfin_trace_buffer();
 635         show_stack(current, &stack);
 636         trace_buffer_restore(tflags);
 637 }
 638 EXPORT_SYMBOL(dump_stack);
 639
 640 void dump_bfin_process(struct pt_regs *fp)
 641 {
 642         /* We should be able to look at fp->ipend, but we don't push it on the
 643          * stack all the time, so do this until we fix that */
 644         unsigned int context = bfin_read_IPEND();
 645
 646         if (oops_in_progress)
 647                 printk(KERN_EMERG "Kernel OOPS in progress\n");
 648
 649         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 650                 printk(KERN_NOTICE "HW Error context\n");
 651         else if (context & 0x0020)
 652                 printk(KERN_NOTICE "Deferred Exception context\n");
 653         else if (context & 0x3FC0)
 654                 printk(KERN_NOTICE "Interrupt context\n");
 655         else if (context & 0x4000)
 656                 printk(KERN_NOTICE "Deferred Interrupt context\n");
 657         else if (context & 0x8000)
 658                 printk(KERN_NOTICE "Kernel process context\n");
 659
 660         if (current->pid && current->mm) {
 661                 printk(KERN_NOTICE "CURRENT PROCESS:\n");
 662                 printk(KERN_NOTICE "COMM=%s PID=%d\n",
 663                         current->comm, current->pid);
 664
 665                 printk(KERN_NOTICE "TEXT = 0x%p-0x%p  DATA = 0x%p-0x%p\n"
 666                         KERN_NOTICE "BSS = 0x%p-0x%p   USER-STACK = 0x%p\n"
 667                         KERN_NOTICE "\n",
 668                         (void *)current->mm->start_code,
 669                         (void *)current->mm->end_code,
 670                         (void *)current->mm->start_data,
 671                         (void *)current->mm->end_data,
 672                         (void *)current->mm->end_data,
 673                         (void *)current->mm->brk,
 674                         (void *)current->mm->start_stack);
 675         } else
 676                 printk(KERN_NOTICE "\n" KERN_NOTICE
 677                      "No Valid process in current context\n");
 678 }
 679
 680 void dump_bfin_mem(struct pt_regs *fp)
 681 {
 682         unsigned short *addr, *erraddr, val = 0, err = 0;
 683         char sti = 0, buf[6];
 684
 685         if (unlikely((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR))
 686                 erraddr = (void *)fp->pc;
 687         else
 688                 erraddr = (void *)fp->retx;
 689
 690         printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
 691
 692         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
 693              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
 694              addr++) {
 695                 if (!((unsigned long)addr & 0xF))
 696                         printk("\n" KERN_NOTICE "0x%p: ", addr);
 697
 698                 if (get_user(val, addr)) {
 699                         if (addr >= (unsigned short *)L1_CODE_START &&
 700                             addr < (unsigned short *)(L1_CODE_START + L1_CODE_LENGTH)) {
 701                                 dma_memcpy(&val, addr, sizeof(val));
 702                                 sprintf(buf, "%04x", val);
 703                         } else if (addr >= (unsigned short *)FIXED_CODE_START &&
 704                                 addr <= (unsigned short *)memory_start) {
 705                                 val = bfin_read16(addr);
 706                                 sprintf(buf, "%04x", val);
 707                         } else {
 708                                 val = 0;
 709                                 sprintf(buf, "????");
 710                         }
 711                 } else
 712                         sprintf(buf, "%04x", val);
 713
 714                 if (addr == erraddr) {
 715                         printk("[%s]", buf);
 716                         err = val;
 717                 } else
 718                         printk(" %s ", buf);
 719
 720                 /* Do any previous instructions turn on interrupts? */
 721                 if (addr <= erraddr &&                          /* in the past */
 722                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
 723                       val == 0x017b))                           /* [SP++] = RETI */
 724                         sti = 1;
 725         }
 726
 727         printk("\n");
 728
 729         /* Hardware error interrupts can be deferred */
 730         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
 731             oops_in_progress)){
 732                 printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
 733 #ifndef CONFIG_DEBUG_HWERR
 734                 printk(KERN_NOTICE "The remaining message may be meaningless\n"
 735                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
 736                          " better idea where it came from\n");
 737 #else
 738                 /* If we are handling only one peripheral interrupt
 739                  * and current mm and pid are valid, and the last error
 740                  * was in that user space process's text area
 741                  * print it out - because that is where the problem exists
 742                  */
 743                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
 744                      (current->pid && current->mm)) {
 745                         /* And the last RETI points to the current userspace context */
 746                         if ((fp + 1)->pc >= current->mm->start_code &&
 747                             (fp + 1)->pc <= current->mm->end_code) {
 748                                 printk(KERN_NOTICE "It might be better to look around here : \n");
 749                                 printk(KERN_NOTICE "-------------------------------------------\n");
 750                                 show_regs(fp + 1);
 751                                 printk(KERN_NOTICE "-------------------------------------------\n");
 752                         }
 753                 }
 754 #endif
 755         }
 756 }
 757
 758 void show_regs(struct pt_regs *fp)
 759 {
 760         char buf [150];
 761         struct irqaction *action;
 762         unsigned int i;
 763         unsigned long flags;
 764
 765         printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
 766         printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
 767                 (long)fp->seqstat, fp->ipend, fp->syscfg);
 768         printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
 769                 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
 770         printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
 771                 fp->seqstat & SEQSTAT_EXCAUSE);
 772         for (i = 6; i <= 15 ; i++) {
 773                 if (fp->ipend & (1 << i)) {
 774                         decode_address(buf, bfin_read32(EVT0 + 4*i));
 775                         printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
 776                 }
 777         }
 778
 779         /* if no interrupts are going off, don't print this out */
 780         if (fp->ipend & ~0x3F) {
 781                 for (i = 0; i < (NR_IRQS - 1); i++) {
 782                         spin_lock_irqsave(&irq_desc[i].lock, flags);
 783                         action = irq_desc[i].action;
 784                         if (!action)
 785                                 goto unlock;
 786
 787                         decode_address(buf, (unsigned int)action->handler);
 788                         printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
 789                         for (action = action->next; action; action = action->next) {
 790                                 decode_address(buf, (unsigned int)action->handler);
 791                                 printk(", %s", buf);
 792                         }
 793                         printk("\n");
 794 unlock:
 795                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 796                 }
 797         }
 798
 799         decode_address(buf, fp->rete);
 800         printk(KERN_NOTICE " RETE: %s\n", buf);
 801         decode_address(buf, fp->retn);
 802         printk(KERN_NOTICE " RETN: %s\n", buf);
 803         decode_address(buf, fp->retx);
 804         printk(KERN_NOTICE " RETX: %s\n", buf);
 805         decode_address(buf, fp->rets);
 806         printk(KERN_NOTICE " RETS: %s\n", buf);
 807         decode_address(buf, fp->pc);
 808         printk(KERN_NOTICE " PC  : %s\n", buf);
 809
 810         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
 811             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
 812                 decode_address(buf, bfin_read_DCPLB_FAULT_ADDR());
 813                 printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
 814                 decode_address(buf, bfin_read_ICPLB_FAULT_ADDR());
 815                 printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
 816         }
 817
 818         printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
 819         printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
 820                 fp->r0, fp->r1, fp->r2, fp->r3);
 821         printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
 822                 fp->r4, fp->r5, fp->r6, fp->r7);
 823         printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
 824                 fp->p0, fp->p1, fp->p2, fp->p3);
 825         printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
 826                 fp->p4, fp->p5, fp->fp, (long)fp);
 827         printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
 828                 fp->lb0, fp->lt0, fp->lc0);
 829         printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
 830                 fp->lb1, fp->lt1, fp->lc1);
 831         printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
 832                 fp->b0, fp->l0, fp->m0, fp->i0);
 833         printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
 834                 fp->b1, fp->l1, fp->m1, fp->i1);
 835         printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
 836                 fp->b2, fp->l2, fp->m2, fp->i2);
 837         printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
 838                 fp->b3, fp->l3, fp->m3, fp->i3);
 839         printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
 840                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
 841
 842         printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
 843                 rdusp(), fp->astat);
 844
 845         printk(KERN_NOTICE "\n");
 846 }
 847
 848 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
 849 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
 850 #endif
 851
 852 asmlinkage int sys_bfin_spinlock(int *spinlock)
 853 {
 854         int ret = 0;
 855         int tmp = 0;
 856
 857         local_irq_disable();
 858         ret = get_user(tmp, spinlock);
 859         if (ret == 0) {
 860                 if (tmp)
 861                         ret = 1;
 862                 tmp = 1;
 863                 put_user(tmp, spinlock);
 864         }
 865         local_irq_enable();
 866         return ret;
 867 }
 868
 869 int bfin_request_exception(unsigned int exception, void (*handler)(void))
 870 {
 871         void (*curr_handler)(void);
 872
 873         if (exception > 0x3F)
 874                 return -EINVAL;
 875
 876         curr_handler = ex_table[exception];
 877
 878         if (curr_handler != ex_replaceable)
 879                 return -EBUSY;
 880
 881         ex_table[exception] = handler;
 882
 883         return 0;
 884 }
 885 EXPORT_SYMBOL(bfin_request_exception);
 886
 887 int bfin_free_exception(unsigned int exception, void (*handler)(void))
 888 {
 889         void (*curr_handler)(void);
 890
 891         if (exception > 0x3F)
 892                 return -EINVAL;
 893
 894         curr_handler = ex_table[exception];
 895
 896         if (curr_handler != handler)
 897                 return -EBUSY;
 898
 899         ex_table[exception] = ex_replaceable;
 900
 901         return 0;
 902 }
 903 EXPORT_SYMBOL(bfin_free_exception);
 904
 905 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
 906 {
 907         switch (cplb_panic) {
 908         case CPLB_NO_UNLOCKED:
 909                 printk(KERN_EMERG "All CPLBs are locked\n");
 910                 break;
 911         case CPLB_PROT_VIOL:
 912                 return;
 913         case CPLB_NO_ADDR_MATCH:
 914                 return;
 915         case CPLB_UNKNOWN_ERR:
 916                 printk(KERN_EMERG "Unknown CPLB Exception\n");
 917                 break;
 918         }
 919
 920         oops_in_progress = 1;
 921
 922         printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void *)bfin_read_DCPLB_FAULT_ADDR());
 923         printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void *)bfin_read_ICPLB_FAULT_ADDR());
 924         dump_bfin_process(fp);
 925         dump_bfin_mem(fp);
 926         show_regs(fp);
 927         dump_stack();
 928         panic("Unrecoverable event\n");
 929 }