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 #ifndef CONFIG_ACCESS_CHECK
 501                         printk(KERN_EMERG "Please turn on "
 502                                "CONFIG_ACCESS_CHECK\n");
 503 #endif
 504                         panic("Kernel exception");
 505                 }
 506         }
 507
 508         info.si_signo = sig;
 509         info.si_errno = 0;
 510         info.si_addr = (void *)fp->pc;
 511         force_sig_info(sig, &info, current);
 512
 513         trace_buffer_restore(j);
 514         return;
 515 }
 516
 517 /* Typical exception handling routines  */
 518
 519 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 520
 521 void dump_bfin_trace_buffer(void)
 522 {
 523 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 524         int tflags, i = 0;
 525         char buf[150];
 526 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 527         int j, index;
 528 #endif
 529
 530         trace_buffer_save(tflags);
 531
 532         printk(KERN_NOTICE "Hardware Trace:\n");
 533
 534         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 535                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 536                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 537                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 538                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 539                         printk(KERN_NOTICE "     Source : %s\n", buf);
 540                 }
 541         }
 542
 543 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 544         if (trace_buff_offset)
 545                 index = trace_buff_offset/4 - 1;
 546         else
 547                 index = EXPAND_LEN;
 548
 549         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 550         while (j) {
 551                 decode_address(buf, software_trace_buff[index]);
 552                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 553                 index -= 1;
 554                 if (index < 0 )
 555                         index = EXPAND_LEN;
 556                 decode_address(buf, software_trace_buff[index]);
 557                 printk(KERN_NOTICE "     Source : %s\n", buf);
 558                 index -= 1;
 559                 if (index < 0)
 560                         index = EXPAND_LEN;
 561                 j--;
 562                 i++;
 563         }
 564 #endif
 565
 566         trace_buffer_restore(tflags);
 567 #endif
 568 }
 569 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 570
 571 static void show_trace(struct task_struct *tsk, unsigned long *sp)
 572 {
 573         unsigned long addr;
 574
 575         printk(KERN_NOTICE "\n" KERN_NOTICE "Call Trace:\n");
 576
 577         while (!kstack_end(sp)) {
 578                 addr = *sp++;
 579                 /*
 580                  * If the address is either in the text segment of the
 581                  * kernel, or in the region which contains vmalloc'ed
 582                  * memory, it *may* be the address of a calling
 583                  * routine; if so, print it so that someone tracing
 584                  * down the cause of the crash will be able to figure
 585                  * out the call path that was taken.
 586                  */
 587                 if (kernel_text_address(addr))
 588                         print_ip_sym(addr);
 589         }
 590
 591         printk(KERN_NOTICE "\n");
 592 }
 593
 594 void show_stack(struct task_struct *task, unsigned long *stack)
 595 {
 596         unsigned long *endstack, addr;
 597         int i;
 598
 599         /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
 600          * called externally in some places in the kernel.
 601          */
 602
 603         if (!stack) {
 604                 if (task)
 605                         stack = (unsigned long *)task->thread.ksp;
 606                 else
 607                         stack = (unsigned long *)&stack;
 608         }
 609
 610         addr = (unsigned long)stack;
 611         endstack = (unsigned long *)PAGE_ALIGN(addr);
 612
 613         printk(KERN_NOTICE "Stack from %08lx:", (unsigned long)stack);
 614         for (i = 0; i < kstack_depth_to_print; i++) {
 615                 if (stack + 1 > endstack)
 616                         break;
 617                 if (i % 8 == 0)
 618                         printk("\n" KERN_NOTICE "       ");
 619                 printk(" %08lx", *stack++);
 620         }
 621         printk("\n");
 622
 623         show_trace(task, stack);
 624 }
 625
 626 void dump_stack(void)
 627 {
 628         unsigned long stack;
 629 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 630         int tflags;
 631 #endif
 632         trace_buffer_save(tflags);
 633         dump_bfin_trace_buffer();
 634         show_stack(current, &stack);
 635         trace_buffer_restore(tflags);
 636 }
 637 EXPORT_SYMBOL(dump_stack);
 638
 639 void dump_bfin_process(struct pt_regs *fp)
 640 {
 641         /* We should be able to look at fp->ipend, but we don't push it on the
 642          * stack all the time, so do this until we fix that */
 643         unsigned int context = bfin_read_IPEND();
 644
 645         if (oops_in_progress)
 646                 printk(KERN_EMERG "Kernel OOPS in progress\n");
 647
 648         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 649                 printk(KERN_NOTICE "HW Error context\n");
 650         else if (context & 0x0020)
 651                 printk(KERN_NOTICE "Defered Exception context\n");
 652         else if (context & 0x3FC0)
 653                 printk(KERN_NOTICE "Interrupt context\n");
 654         else if (context & 0x4000)
 655                 printk(KERN_NOTICE "Deferred Interrupt context\n");
 656         else if (context & 0x8000)
 657                 printk(KERN_NOTICE "Kernel process context\n");
 658
 659         if (current->pid && current->mm) {
 660                 printk(KERN_NOTICE "CURRENT PROCESS:\n");
 661                 printk(KERN_NOTICE "COMM=%s PID=%d\n",
 662                         current->comm, current->pid);
 663
 664                 printk(KERN_NOTICE "TEXT = 0x%p-0x%p  DATA = 0x%p-0x%p\n"
 665                         KERN_NOTICE "BSS = 0x%p-0x%p   USER-STACK = 0x%p\n"
 666                         KERN_NOTICE "\n",
 667                         (void *)current->mm->start_code,
 668                         (void *)current->mm->end_code,
 669                         (void *)current->mm->start_data,
 670                         (void *)current->mm->end_data,
 671                         (void *)current->mm->end_data,
 672                         (void *)current->mm->brk,
 673                         (void *)current->mm->start_stack);
 674         } else
 675                 printk(KERN_NOTICE "\n" KERN_NOTICE
 676                      "No Valid process in current context\n");
 677 }
 678
 679 void dump_bfin_mem(struct pt_regs *fp)
 680 {
 681         unsigned short *addr, *erraddr, val = 0, err = 0;
 682         char sti = 0, buf[6];
 683
 684         if (unlikely((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR))
 685                 erraddr = (void *)fp->pc;
 686         else
 687                 erraddr = (void *)fp->retx;
 688
 689         printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
 690
 691         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
 692              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
 693              addr++) {
 694                 if (!((unsigned long)addr & 0xF))
 695                         printk("\n" KERN_NOTICE "0x%p: ", addr);
 696
 697                 if (get_user(val, addr)) {
 698                         if (addr >= (unsigned short *)L1_CODE_START &&
 699                             addr < (unsigned short *)(L1_CODE_START + L1_CODE_LENGTH)) {
 700                                 dma_memcpy(&val, addr, sizeof(val));
 701                                 sprintf(buf, "%04x", val);
 702                         } else if (addr >= (unsigned short *)FIXED_CODE_START &&
 703                                 addr <= (unsigned short *)memory_start) {
 704                                 val = bfin_read16(addr);
 705                                 sprintf(buf, "%04x", val);
 706                         } else {
 707                                 val = 0;
 708                                 sprintf(buf, "????");
 709                         }
 710                 } else
 711                         sprintf(buf, "%04x", val);
 712
 713                 if (addr == erraddr) {
 714                         printk("[%s]", buf);
 715                         err = val;
 716                 } else
 717                         printk(" %s ", buf);
 718
 719                 /* Do any previous instructions turn on interrupts? */
 720                 if (addr <= erraddr &&                          /* in the past */
 721                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
 722                       val == 0x017b))                           /* [SP++] = RETI */
 723                         sti = 1;
 724         }
 725
 726         printk("\n");
 727
 728         /* Hardware error interrupts can be deferred */
 729         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
 730             oops_in_progress)){
 731                 printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
 732 #ifndef CONFIG_DEBUG_HWERR
 733                 printk(KERN_NOTICE "The remaining message may be meaningless\n"
 734                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
 735                          " better idea where it came from\n");
 736 #else
 737                 /* If we are handling only one peripheral interrupt
 738                  * and current mm and pid are valid, and the last error
 739                  * was in that user space process's text area
 740                  * print it out - because that is where the problem exists
 741                  */
 742                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
 743                      (current->pid && current->mm)) {
 744                         /* And the last RETI points to the current userspace context */
 745                         if ((fp + 1)->pc >= current->mm->start_code &&
 746                             (fp + 1)->pc <= current->mm->end_code) {
 747                                 printk(KERN_NOTICE "It might be better to look around here : \n");
 748                                 printk(KERN_NOTICE "-------------------------------------------\n");
 749                                 show_regs(fp + 1);
 750                                 printk(KERN_NOTICE "-------------------------------------------\n");
 751                         }
 752                 }
 753 #endif
 754         }
 755 }
 756
 757 void show_regs(struct pt_regs *fp)
 758 {
 759         char buf [150];
 760         struct irqaction *action;
 761         unsigned int i;
 762         unsigned long flags;
 763
 764         printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\n");
 765         printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
 766                 (long)fp->seqstat, fp->ipend, fp->syscfg);
 767         printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
 768                 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
 769         printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
 770                 fp->seqstat & SEQSTAT_EXCAUSE);
 771         for (i = 6; i <= 15 ; i++) {
 772                 if (fp->ipend & (1 << i)) {
 773                         decode_address(buf, bfin_read32(EVT0 + 4*i));
 774                         printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
 775                 }
 776         }
 777
 778         /* if no interrupts are going off, don't print this out */
 779         if (fp->ipend & ~0x3F) {
 780                 for (i = 0; i < (NR_IRQS - 1); i++) {
 781                         spin_lock_irqsave(&irq_desc[i].lock, flags);
 782                         action = irq_desc[i].action;
 783                         if (!action)
 784                                 goto unlock;
 785
 786                         decode_address(buf, (unsigned int)action->handler);
 787                         printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
 788                         for (action = action->next; action; action = action->next) {
 789                                 decode_address(buf, (unsigned int)action->handler);
 790                                 printk(", %s", buf);
 791                         }
 792                         printk("\n");
 793 unlock:
 794                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 795                 }
 796         }
 797
 798         decode_address(buf, fp->rete);
 799         printk(KERN_NOTICE " RETE: %s\n", buf);
 800         decode_address(buf, fp->retn);
 801         printk(KERN_NOTICE " RETN: %s\n", buf);
 802         decode_address(buf, fp->retx);
 803         printk(KERN_NOTICE " RETX: %s\n", buf);
 804         decode_address(buf, fp->rets);
 805         printk(KERN_NOTICE " RETS: %s\n", buf);
 806         decode_address(buf, fp->pc);
 807         printk(KERN_NOTICE " PC  : %s\n", buf);
 808
 809         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
 810             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
 811                 decode_address(buf, bfin_read_DCPLB_FAULT_ADDR());
 812                 printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
 813                 decode_address(buf, bfin_read_ICPLB_FAULT_ADDR());
 814                 printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
 815         }
 816
 817         printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
 818         printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
 819                 fp->r0, fp->r1, fp->r2, fp->r3);
 820         printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
 821                 fp->r4, fp->r5, fp->r6, fp->r7);
 822         printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
 823                 fp->p0, fp->p1, fp->p2, fp->p3);
 824         printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
 825                 fp->p4, fp->p5, fp->fp, (long)fp);
 826         printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
 827                 fp->lb0, fp->lt0, fp->lc0);
 828         printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
 829                 fp->lb1, fp->lt1, fp->lc1);
 830         printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
 831                 fp->b0, fp->l0, fp->m0, fp->i0);
 832         printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
 833                 fp->b1, fp->l1, fp->m1, fp->i1);
 834         printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
 835                 fp->b2, fp->l2, fp->m2, fp->i2);
 836         printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
 837                 fp->b3, fp->l3, fp->m3, fp->i3);
 838         printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
 839                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
 840
 841         printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
 842                 rdusp(), fp->astat);
 843
 844         printk(KERN_NOTICE "\n");
 845 }
 846
 847 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
 848 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
 849 #endif
 850
 851 asmlinkage int sys_bfin_spinlock(int *spinlock)
 852 {
 853         int ret = 0;
 854         int tmp = 0;
 855
 856         local_irq_disable();
 857         ret = get_user(tmp, spinlock);
 858         if (ret == 0) {
 859                 if (tmp)
 860                         ret = 1;
 861                 tmp = 1;
 862                 put_user(tmp, spinlock);
 863         }
 864         local_irq_enable();
 865         return ret;
 866 }
 867
 868 int bfin_request_exception(unsigned int exception, void (*handler)(void))
 869 {
 870         void (*curr_handler)(void);
 871
 872         if (exception > 0x3F)
 873                 return -EINVAL;
 874
 875         curr_handler = ex_table[exception];
 876
 877         if (curr_handler != ex_replaceable)
 878                 return -EBUSY;
 879
 880         ex_table[exception] = handler;
 881
 882         return 0;
 883 }
 884 EXPORT_SYMBOL(bfin_request_exception);
 885
 886 int bfin_free_exception(unsigned int exception, void (*handler)(void))
 887 {
 888         void (*curr_handler)(void);
 889
 890         if (exception > 0x3F)
 891                 return -EINVAL;
 892
 893         curr_handler = ex_table[exception];
 894
 895         if (curr_handler != handler)
 896                 return -EBUSY;
 897
 898         ex_table[exception] = ex_replaceable;
 899
 900         return 0;
 901 }
 902 EXPORT_SYMBOL(bfin_free_exception);
 903
 904 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
 905 {
 906         switch (cplb_panic) {
 907         case CPLB_NO_UNLOCKED:
 908                 printk(KERN_EMERG "All CPLBs are locked\n");
 909                 break;
 910         case CPLB_PROT_VIOL:
 911                 return;
 912         case CPLB_NO_ADDR_MATCH:
 913                 return;
 914         case CPLB_UNKNOWN_ERR:
 915                 printk(KERN_EMERG "Unknown CPLB Exception\n");
 916                 break;
 917         }
 918
 919         oops_in_progress = 1;
 920
 921         printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void *)bfin_read_DCPLB_FAULT_ADDR());
 922         printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void *)bfin_read_ICPLB_FAULT_ADDR());
 923         dump_bfin_process(fp);
 924         dump_bfin_mem(fp);
 925         show_regs(fp);
 926         dump_stack();
 927         panic("Unrecoverable event\n");
 928 }