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 char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
  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_atomic ? 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 _tmpbuf[256];
 130                                 char *name = p->comm;
 131                                 struct file *file = vma->vm_file;
 132
 133                                 if (file)
 134                                         name = d_path(&file->f_path, _tmpbuf,
 135                                                       sizeof(_tmpbuf));
 136
 137                                 /* FLAT does not have its text aligned to the start of
 138                                  * the map while FDPIC ELF does ...
 139                                  */
 140
 141                                 /* before we can check flat/fdpic, we need to
 142                                  * make sure current is valid
 143                                  */
 144                                 if ((unsigned long)current >= FIXED_CODE_START &&
 145                                     !((unsigned long)current & 0x3)) {
 146                                         if (current->mm &&
 147                                             (address > current->mm->start_code) &&
 148                                             (address < current->mm->end_code))
 149                                                 offset = address - current->mm->start_code;
 150                                         else
 151                                                 offset = (address - vma->vm_start) +
 152                                                          (vma->vm_pgoff << PAGE_SHIFT);
 153
 154                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 155                                                 (void *)address, name, offset);
 156                                 } else
 157                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
 158                                                 (void *)address, name,
 159                                                 vma->vm_start, vma->vm_end);
 160
 161                                 if (!in_atomic)
 162                                         mmput(mm);
 163
 164                                 goto done;
 165                         }
 166
 167                         vml = vml->next;
 168                 }
 169                 if (!in_atomic)
 170                         mmput(mm);
 171         }
 172
 173         /* we were unable to find this address anywhere */
 174         sprintf(buf, "<0x%p> /* unknown address */", (void *)address);
 175
 176 done:
 177         write_unlock_irqrestore(&tasklist_lock, flags);
 178 }
 179
 180 asmlinkage void double_fault_c(struct pt_regs *fp)
 181 {
 182         console_verbose();
 183         oops_in_progress = 1;
 184         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 185         dump_bfin_process(fp);
 186         dump_bfin_mem(fp);
 187         show_regs(fp);
 188         panic("Double Fault - unrecoverable event\n");
 189
 190 }
 191
 192 asmlinkage void trap_c(struct pt_regs *fp)
 193 {
 194 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 195         int j;
 196 #endif
 197         int sig = 0;
 198         siginfo_t info;
 199         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 200
 201         trace_buffer_save(j);
 202
 203         /* Important - be very careful dereferncing pointers - will lead to
 204          * double faults if the stack has become corrupt
 205          */
 206
 207         /* If the fault was caused by a kernel thread, or interrupt handler
 208          * we will kernel panic, so the system reboots.
 209          * If KGDB is enabled, don't set this for kernel breakpoints
 210         */
 211
 212         /* TODO: check to see if we are in some sort of deferred HWERR
 213          * that we should be able to recover from, not kernel panic
 214          */
 215         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
 216 #ifdef CONFIG_KGDB
 217                 && (trapnr != VEC_EXCPT02)
 218 #endif
 219         ){
 220                 console_verbose();
 221                 oops_in_progress = 1;
 222         } else if (current) {
 223                 if (current->mm == NULL) {
 224                         console_verbose();
 225                         oops_in_progress = 1;
 226                 }
 227         }
 228
 229         /* trap_c() will be called for exceptions. During exceptions
 230          * processing, the pc value should be set with retx value.
 231          * With this change we can cleanup some code in signal.c- TODO
 232          */
 233         fp->orig_pc = fp->retx;
 234         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 235                 trapnr, fp->ipend, fp->pc, fp->retx); */
 236
 237         /* send the appropriate signal to the user program */
 238         switch (trapnr) {
 239
 240         /* This table works in conjuction with the one in ./mach-common/entry.S
 241          * Some exceptions are handled there (in assembly, in exception space)
 242          * Some are handled here, (in C, in interrupt space)
 243          * Some, like CPLB, are handled in both, where the normal path is
 244          * handled in assembly/exception space, and the error path is handled
 245          * here
 246          */
 247
 248         /* 0x00 - Linux Syscall, getting here is an error */
 249         /* 0x01 - userspace gdb breakpoint, handled here */
 250         case VEC_EXCPT01:
 251                 info.si_code = TRAP_ILLTRAP;
 252                 sig = SIGTRAP;
 253                 CHK_DEBUGGER_TRAP_MAYBE();
 254                 /* Check if this is a breakpoint in kernel space */
 255                 if (fp->ipend & 0xffc0)
 256                         return;
 257                 else
 258                         break;
 259 #ifdef CONFIG_KGDB
 260         case VEC_EXCPT02 :               /* gdb connection */
 261                 info.si_code = TRAP_ILLTRAP;
 262                 sig = SIGTRAP;
 263                 CHK_DEBUGGER_TRAP();
 264                 return;
 265 #else
 266         /* 0x02 - User Defined, Caught by default */
 267 #endif
 268         /* 0x03 - User Defined, userspace stack overflow */
 269         case VEC_EXCPT03:
 270                 info.si_code = SEGV_STACKFLOW;
 271                 sig = SIGSEGV;
 272                 printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
 273                 CHK_DEBUGGER_TRAP();
 274                 break;
 275         /* 0x04 - User Defined, Caught by default */
 276         /* 0x05 - User Defined, Caught by default */
 277         /* 0x06 - User Defined, Caught by default */
 278         /* 0x07 - User Defined, Caught by default */
 279         /* 0x08 - User Defined, Caught by default */
 280         /* 0x09 - User Defined, Caught by default */
 281         /* 0x0A - User Defined, Caught by default */
 282         /* 0x0B - User Defined, Caught by default */
 283         /* 0x0C - User Defined, Caught by default */
 284         /* 0x0D - User Defined, Caught by default */
 285         /* 0x0E - User Defined, Caught by default */
 286         /* 0x0F - User Defined, Caught by default */
 287         /* 0x10 HW Single step, handled here */
 288         case VEC_STEP:
 289                 info.si_code = TRAP_STEP;
 290                 sig = SIGTRAP;
 291                 CHK_DEBUGGER_TRAP_MAYBE();
 292                 /* Check if this is a single step in kernel space */
 293                 if (fp->ipend & 0xffc0)
 294                         return;
 295                 else
 296                         break;
 297         /* 0x11 - Trace Buffer Full, handled here */
 298         case VEC_OVFLOW:
 299                 info.si_code = TRAP_TRACEFLOW;
 300                 sig = SIGTRAP;
 301                 printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
 302                 CHK_DEBUGGER_TRAP();
 303                 break;
 304         /* 0x12 - Reserved, Caught by default */
 305         /* 0x13 - Reserved, Caught by default */
 306         /* 0x14 - Reserved, Caught by default */
 307         /* 0x15 - Reserved, Caught by default */
 308         /* 0x16 - Reserved, Caught by default */
 309         /* 0x17 - Reserved, Caught by default */
 310         /* 0x18 - Reserved, Caught by default */
 311         /* 0x19 - Reserved, Caught by default */
 312         /* 0x1A - Reserved, Caught by default */
 313         /* 0x1B - Reserved, Caught by default */
 314         /* 0x1C - Reserved, Caught by default */
 315         /* 0x1D - Reserved, Caught by default */
 316         /* 0x1E - Reserved, Caught by default */
 317         /* 0x1F - Reserved, Caught by default */
 318         /* 0x20 - Reserved, Caught by default */
 319         /* 0x21 - Undefined Instruction, handled here */
 320         case VEC_UNDEF_I:
 321                 info.si_code = ILL_ILLOPC;
 322                 sig = SIGILL;
 323                 printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
 324                 CHK_DEBUGGER_TRAP();
 325                 break;
 326         /* 0x22 - Illegal Instruction Combination, handled here */
 327         case VEC_ILGAL_I:
 328                 info.si_code = ILL_ILLPARAOP;
 329                 sig = SIGILL;
 330                 printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
 331                 CHK_DEBUGGER_TRAP();
 332                 break;
 333         /* 0x23 - Data CPLB protection violation, handled here */
 334         case VEC_CPLB_VL:
 335                 info.si_code = ILL_CPLB_VI;
 336                 sig = SIGBUS;
 337                 printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
 338                 CHK_DEBUGGER_TRAP();
 339                 break;
 340         /* 0x24 - Data access misaligned, handled here */
 341         case VEC_MISALI_D:
 342                 info.si_code = BUS_ADRALN;
 343                 sig = SIGBUS;
 344                 printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
 345                 CHK_DEBUGGER_TRAP();
 346                 break;
 347         /* 0x25 - Unrecoverable Event, handled here */
 348         case VEC_UNCOV:
 349                 info.si_code = ILL_ILLEXCPT;
 350                 sig = SIGILL;
 351                 printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
 352                 CHK_DEBUGGER_TRAP();
 353                 break;
 354         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 355                 error case is handled here */
 356         case VEC_CPLB_M:
 357                 info.si_code = BUS_ADRALN;
 358                 sig = SIGBUS;
 359                 printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
 360                 CHK_DEBUGGER_TRAP();
 361                 break;
 362         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 363         case VEC_CPLB_MHIT:
 364                 info.si_code = ILL_CPLB_MULHIT;
 365 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 366                 sig = SIGSEGV;
 367                 printk(KERN_NOTICE "NULL pointer access (probably)\n");
 368 #else
 369                 sig = SIGILL;
 370                 printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
 371 #endif
 372                 CHK_DEBUGGER_TRAP();
 373                 break;
 374         /* 0x28 - Emulation Watchpoint, handled here */
 375         case VEC_WATCH:
 376                 info.si_code = TRAP_WATCHPT;
 377                 sig = SIGTRAP;
 378                 pr_debug(EXC_0x28(KERN_DEBUG));
 379                 CHK_DEBUGGER_TRAP_MAYBE();
 380                 /* Check if this is a watchpoint in kernel space */
 381                 if (fp->ipend & 0xffc0)
 382                         return;
 383                 else
 384                         break;
 385 #ifdef CONFIG_BF535
 386         /* 0x29 - Instruction fetch access error (535 only) */
 387         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 388                 info.si_code = BUS_OPFETCH;
 389                 sig = SIGBUS;
 390                 printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 391                 CHK_DEBUGGER_TRAP();
 392                 break;
 393 #else
 394         /* 0x29 - Reserved, Caught by default */
 395 #endif
 396         /* 0x2A - Instruction fetch misaligned, handled here */
 397         case VEC_MISALI_I:
 398                 info.si_code = BUS_ADRALN;
 399                 sig = SIGBUS;
 400                 printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
 401                 CHK_DEBUGGER_TRAP();
 402                 break;
 403         /* 0x2B - Instruction CPLB protection violation, handled here */
 404         case VEC_CPLB_I_VL:
 405                 info.si_code = ILL_CPLB_VI;
 406                 sig = SIGBUS;
 407                 printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
 408                 CHK_DEBUGGER_TRAP();
 409                 break;
 410         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 411         case VEC_CPLB_I_M:
 412                 info.si_code = ILL_CPLB_MISS;
 413                 sig = SIGBUS;
 414                 printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
 415                 CHK_DEBUGGER_TRAP();
 416                 break;
 417         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 418         case VEC_CPLB_I_MHIT:
 419                 info.si_code = ILL_CPLB_MULHIT;
 420 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 421                 sig = SIGSEGV;
 422                 printk(KERN_NOTICE "Jump to address 0 - 0x0fff\n");
 423 #else
 424                 sig = SIGILL;
 425                 printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
 426 #endif
 427                 CHK_DEBUGGER_TRAP();
 428                 break;
 429         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 430         case VEC_ILL_RES:
 431                 info.si_code = ILL_PRVOPC;
 432                 sig = SIGILL;
 433                 printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
 434                 CHK_DEBUGGER_TRAP();
 435                 break;
 436         /* 0x2F - Reserved, Caught by default */
 437         /* 0x30 - Reserved, Caught by default */
 438         /* 0x31 - Reserved, Caught by default */
 439         /* 0x32 - Reserved, Caught by default */
 440         /* 0x33 - Reserved, Caught by default */
 441         /* 0x34 - Reserved, Caught by default */
 442         /* 0x35 - Reserved, Caught by default */
 443         /* 0x36 - Reserved, Caught by default */
 444         /* 0x37 - Reserved, Caught by default */
 445         /* 0x38 - Reserved, Caught by default */
 446         /* 0x39 - Reserved, Caught by default */
 447         /* 0x3A - Reserved, Caught by default */
 448         /* 0x3B - Reserved, Caught by default */
 449         /* 0x3C - Reserved, Caught by default */
 450         /* 0x3D - Reserved, Caught by default */
 451         /* 0x3E - Reserved, Caught by default */
 452         /* 0x3F - Reserved, Caught by default */
 453         case VEC_HWERR:
 454                 info.si_code = BUS_ADRALN;
 455                 sig = SIGBUS;
 456                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 457                 /* System MMR Error */
 458                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 459                         info.si_code = BUS_ADRALN;
 460                         sig = SIGBUS;
 461                         printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
 462                         break;
 463                 /* External Memory Addressing Error */
 464                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 465                         info.si_code = BUS_ADRERR;
 466                         sig = SIGBUS;
 467                         printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
 468                         break;
 469                 /* Performance Monitor Overflow */
 470                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 471                         printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
 472                         break;
 473                 /* RAISE 5 instruction */
 474                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 475                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 476                         break;
 477                 default:        /* Reserved */
 478                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 479                         break;
 480                 }
 481                 CHK_DEBUGGER_TRAP();
 482                 break;
 483         default:
 484                 info.si_code = TRAP_ILLTRAP;
 485                 sig = SIGTRAP;
 486                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 487                         (fp->seqstat & SEQSTAT_EXCAUSE));
 488                 CHK_DEBUGGER_TRAP();
 489                 break;
 490         }
 491
 492         BUG_ON(sig == 0);
 493
 494         if (sig != SIGTRAP) {
 495                 unsigned long stack;
 496                 dump_bfin_process(fp);
 497                 dump_bfin_mem(fp);
 498                 show_regs(fp);
 499
 500                 /* Print out the trace buffer if it makes sense */
 501 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 502                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 503                         printk(KERN_NOTICE "No trace since you do not have "
 504                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 505                                 KERN_NOTICE "\n");
 506                 else
 507 #endif
 508                         dump_bfin_trace_buffer();
 509                 show_stack(current, &stack);
 510                 if (oops_in_progress) {
 511                         print_modules();
 512 #ifndef CONFIG_ACCESS_CHECK
 513                         printk(KERN_EMERG "Please turn on "
 514                                "CONFIG_ACCESS_CHECK\n");
 515 #endif
 516                         panic("Kernel exception");
 517                 }
 518         }
 519
 520         info.si_signo = sig;
 521         info.si_errno = 0;
 522         info.si_addr = (void __user *)fp->pc;
 523         force_sig_info(sig, &info, current);
 524
 525         trace_buffer_restore(j);
 526         return;
 527 }
 528
 529 /* Typical exception handling routines  */
 530
 531 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 532
 533 void dump_bfin_trace_buffer(void)
 534 {
 535 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 536         int tflags, i = 0;
 537         char buf[150];
 538 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 539         int j, index;
 540 #endif
 541
 542         trace_buffer_save(tflags);
 543
 544         printk(KERN_NOTICE "Hardware Trace:\n");
 545
 546         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 547                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 548                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 549                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 550                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 551                         printk(KERN_NOTICE "     Source : %s\n", buf);
 552                 }
 553         }
 554
 555 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 556         if (trace_buff_offset)
 557                 index = trace_buff_offset/4 - 1;
 558         else
 559                 index = EXPAND_LEN;
 560
 561         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 562         while (j) {
 563                 decode_address(buf, software_trace_buff[index]);
 564                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 565                 index -= 1;
 566                 if (index < 0 )
 567                         index = EXPAND_LEN;
 568                 decode_address(buf, software_trace_buff[index]);
 569                 printk(KERN_NOTICE "     Source : %s\n", buf);
 570                 index -= 1;
 571                 if (index < 0)
 572                         index = EXPAND_LEN;
 573                 j--;
 574                 i++;
 575         }
 576 #endif
 577
 578         trace_buffer_restore(tflags);
 579 #endif
 580 }
 581 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 582
 583 static void show_trace(struct task_struct *tsk, unsigned long *sp)
 584 {
 585         unsigned long addr;
 586
 587         printk(KERN_NOTICE "\n" KERN_NOTICE "Call Trace:\n");
 588
 589         while (!kstack_end(sp)) {
 590                 addr = *sp++;
 591                 /*
 592                  * If the address is either in the text segment of the
 593                  * kernel, or in the region which contains vmalloc'ed
 594                  * memory, it *may* be the address of a calling
 595                  * routine; if so, print it so that someone tracing
 596                  * down the cause of the crash will be able to figure
 597                  * out the call path that was taken.
 598                  */
 599                 if (kernel_text_address(addr))
 600                         print_ip_sym(addr);
 601         }
 602
 603         printk(KERN_NOTICE "\n");
 604 }
 605
 606 void show_stack(struct task_struct *task, unsigned long *stack)
 607 {
 608         unsigned long *endstack, addr;
 609         int i;
 610
 611         /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
 612          * called externally in some places in the kernel.
 613          */
 614
 615         if (!stack) {
 616                 if (task)
 617                         stack = (unsigned long *)task->thread.ksp;
 618                 else
 619                         stack = (unsigned long *)&stack;
 620         }
 621
 622         addr = (unsigned long)stack;
 623         endstack = (unsigned long *)PAGE_ALIGN(addr);
 624
 625         printk(KERN_NOTICE "Stack from %08lx:", (unsigned long)stack);
 626         for (i = 0; i < kstack_depth_to_print; i++) {
 627                 if (stack + 1 > endstack)
 628                         break;
 629                 if (i % 8 == 0)
 630                         printk("\n" KERN_NOTICE "       ");
 631                 printk(" %08lx", *stack++);
 632         }
 633         printk("\n");
 634
 635         show_trace(task, stack);
 636 }
 637
 638 void dump_stack(void)
 639 {
 640         unsigned long stack;
 641 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 642         int tflags;
 643 #endif
 644         trace_buffer_save(tflags);
 645         dump_bfin_trace_buffer();
 646         show_stack(current, &stack);
 647         trace_buffer_restore(tflags);
 648 }
 649 EXPORT_SYMBOL(dump_stack);
 650
 651 void dump_bfin_process(struct pt_regs *fp)
 652 {
 653         /* We should be able to look at fp->ipend, but we don't push it on the
 654          * stack all the time, so do this until we fix that */
 655         unsigned int context = bfin_read_IPEND();
 656
 657         if (oops_in_progress)
 658                 printk(KERN_EMERG "Kernel OOPS in progress\n");
 659
 660         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 661                 printk(KERN_NOTICE "HW Error context\n");
 662         else if (context & 0x0020)
 663                 printk(KERN_NOTICE "Deferred Exception context\n");
 664         else if (context & 0x3FC0)
 665                 printk(KERN_NOTICE "Interrupt context\n");
 666         else if (context & 0x4000)
 667                 printk(KERN_NOTICE "Deferred Interrupt context\n");
 668         else if (context & 0x8000)
 669                 printk(KERN_NOTICE "Kernel process context\n");
 670
 671         /* Because we are crashing, and pointers could be bad, we check things
 672          * pretty closely before we use them
 673          */
 674         if ((unsigned long)current >= FIXED_CODE_START &&
 675             !((unsigned long)current & 0x3) && current->pid) {
 676                 printk(KERN_NOTICE "CURRENT PROCESS:\n");
 677                 if (current->comm >= (char *)FIXED_CODE_START)
 678                         printk(KERN_NOTICE "COMM=%s PID=%d\n",
 679                                 current->comm, current->pid);
 680                 else
 681                         printk(KERN_NOTICE "COMM= invalid\n");
 682
 683                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
 684                         printk(KERN_NOTICE  "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
 685                                 KERN_NOTICE " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n"
 686                                 KERN_NOTICE "\n",
 687                                 (void *)current->mm->start_code,
 688                                 (void *)current->mm->end_code,
 689                                 (void *)current->mm->start_data,
 690                                 (void *)current->mm->end_data,
 691                                 (void *)current->mm->end_data,
 692                                 (void *)current->mm->brk,
 693                                 (void *)current->mm->start_stack);
 694                 else
 695                         printk(KERN_NOTICE "invalid mm\n");
 696         } else
 697                 printk(KERN_NOTICE "\n" KERN_NOTICE
 698                      "No Valid process in current context\n");
 699 }
 700
 701 void dump_bfin_mem(struct pt_regs *fp)
 702 {
 703         unsigned short *addr, *erraddr, val = 0, err = 0;
 704         char sti = 0, buf[6];
 705
 706         if (unlikely((fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR))
 707                 erraddr = (void *)fp->pc;
 708         else
 709                 erraddr = (void *)fp->retx;
 710
 711         printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
 712
 713         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
 714              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
 715              addr++) {
 716                 if (!((unsigned long)addr & 0xF))
 717                         printk("\n" KERN_NOTICE "0x%p: ", addr);
 718
 719                 if (get_user(val, addr)) {
 720                         if (addr >= (unsigned short *)L1_CODE_START &&
 721                             addr < (unsigned short *)(L1_CODE_START + L1_CODE_LENGTH)) {
 722                                 dma_memcpy(&val, addr, sizeof(val));
 723                                 sprintf(buf, "%04x", val);
 724                         } else if (addr >= (unsigned short *)FIXED_CODE_START &&
 725                                 addr <= (unsigned short *)memory_start) {
 726                                 val = bfin_read16(addr);
 727                                 sprintf(buf, "%04x", val);
 728                         } else {
 729                                 val = 0;
 730                                 sprintf(buf, "????");
 731                         }
 732                 } else
 733                         sprintf(buf, "%04x", val);
 734
 735                 if (addr == erraddr) {
 736                         printk("[%s]", buf);
 737                         err = val;
 738                 } else
 739                         printk(" %s ", buf);
 740
 741                 /* Do any previous instructions turn on interrupts? */
 742                 if (addr <= erraddr &&                          /* in the past */
 743                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
 744                       val == 0x017b))                           /* [SP++] = RETI */
 745                         sti = 1;
 746         }
 747
 748         printk("\n");
 749
 750         /* Hardware error interrupts can be deferred */
 751         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
 752             oops_in_progress)){
 753                 printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
 754 #ifndef CONFIG_DEBUG_HWERR
 755                 printk(KERN_NOTICE "The remaining message may be meaningless\n"
 756                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
 757                          " better idea where it came from\n");
 758 #else
 759                 /* If we are handling only one peripheral interrupt
 760                  * and current mm and pid are valid, and the last error
 761                  * was in that user space process's text area
 762                  * print it out - because that is where the problem exists
 763                  */
 764                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
 765                      (current->pid && current->mm)) {
 766                         /* And the last RETI points to the current userspace context */
 767                         if ((fp + 1)->pc >= current->mm->start_code &&
 768                             (fp + 1)->pc <= current->mm->end_code) {
 769                                 printk(KERN_NOTICE "It might be better to look around here : \n");
 770                                 printk(KERN_NOTICE "-------------------------------------------\n");
 771                                 show_regs(fp + 1);
 772                                 printk(KERN_NOTICE "-------------------------------------------\n");
 773                         }
 774                 }
 775 #endif
 776         }
 777 }
 778
 779 void show_regs(struct pt_regs *fp)
 780 {
 781         char buf [150];
 782         struct irqaction *action;
 783         unsigned int i;
 784         unsigned long flags;
 785
 786         printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
 787         printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
 788                 (long)fp->seqstat, fp->ipend, fp->syscfg);
 789         printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
 790                 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
 791         printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
 792                 fp->seqstat & SEQSTAT_EXCAUSE);
 793         for (i = 6; i <= 15 ; i++) {
 794                 if (fp->ipend & (1 << i)) {
 795                         decode_address(buf, bfin_read32(EVT0 + 4*i));
 796                         printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
 797                 }
 798         }
 799
 800         /* if no interrupts are going off, don't print this out */
 801         if (fp->ipend & ~0x3F) {
 802                 for (i = 0; i < (NR_IRQS - 1); i++) {
 803                         spin_lock_irqsave(&irq_desc[i].lock, flags);
 804                         action = irq_desc[i].action;
 805                         if (!action)
 806                                 goto unlock;
 807
 808                         decode_address(buf, (unsigned int)action->handler);
 809                         printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
 810                         for (action = action->next; action; action = action->next) {
 811                                 decode_address(buf, (unsigned int)action->handler);
 812                                 printk(", %s", buf);
 813                         }
 814                         printk("\n");
 815 unlock:
 816                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 817                 }
 818         }
 819
 820         decode_address(buf, fp->rete);
 821         printk(KERN_NOTICE " RETE: %s\n", buf);
 822         decode_address(buf, fp->retn);
 823         printk(KERN_NOTICE " RETN: %s\n", buf);
 824         decode_address(buf, fp->retx);
 825         printk(KERN_NOTICE " RETX: %s\n", buf);
 826         decode_address(buf, fp->rets);
 827         printk(KERN_NOTICE " RETS: %s\n", buf);
 828         decode_address(buf, fp->pc);
 829         printk(KERN_NOTICE " PC  : %s\n", buf);
 830
 831         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
 832             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
 833                 decode_address(buf, bfin_read_DCPLB_FAULT_ADDR());
 834                 printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
 835                 decode_address(buf, bfin_read_ICPLB_FAULT_ADDR());
 836                 printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
 837         }
 838
 839         printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
 840         printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
 841                 fp->r0, fp->r1, fp->r2, fp->r3);
 842         printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
 843                 fp->r4, fp->r5, fp->r6, fp->r7);
 844         printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
 845                 fp->p0, fp->p1, fp->p2, fp->p3);
 846         printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
 847                 fp->p4, fp->p5, fp->fp, (long)fp);
 848         printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
 849                 fp->lb0, fp->lt0, fp->lc0);
 850         printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
 851                 fp->lb1, fp->lt1, fp->lc1);
 852         printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
 853                 fp->b0, fp->l0, fp->m0, fp->i0);
 854         printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
 855                 fp->b1, fp->l1, fp->m1, fp->i1);
 856         printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
 857                 fp->b2, fp->l2, fp->m2, fp->i2);
 858         printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
 859                 fp->b3, fp->l3, fp->m3, fp->i3);
 860         printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
 861                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
 862
 863         printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
 864                 rdusp(), fp->astat);
 865
 866         printk(KERN_NOTICE "\n");
 867 }
 868
 869 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
 870 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
 871 #endif
 872
 873 asmlinkage int sys_bfin_spinlock(int *spinlock)
 874 {
 875         int ret = 0;
 876         int tmp = 0;
 877
 878         local_irq_disable();
 879         ret = get_user(tmp, spinlock);
 880         if (ret == 0) {
 881                 if (tmp)
 882                         ret = 1;
 883                 tmp = 1;
 884                 put_user(tmp, spinlock);
 885         }
 886         local_irq_enable();
 887         return ret;
 888 }
 889
 890 int bfin_request_exception(unsigned int exception, void (*handler)(void))
 891 {
 892         void (*curr_handler)(void);
 893
 894         if (exception > 0x3F)
 895                 return -EINVAL;
 896
 897         curr_handler = ex_table[exception];
 898
 899         if (curr_handler != ex_replaceable)
 900                 return -EBUSY;
 901
 902         ex_table[exception] = handler;
 903
 904         return 0;
 905 }
 906 EXPORT_SYMBOL(bfin_request_exception);
 907
 908 int bfin_free_exception(unsigned int exception, void (*handler)(void))
 909 {
 910         void (*curr_handler)(void);
 911
 912         if (exception > 0x3F)
 913                 return -EINVAL;
 914
 915         curr_handler = ex_table[exception];
 916
 917         if (curr_handler != handler)
 918                 return -EBUSY;
 919
 920         ex_table[exception] = ex_replaceable;
 921
 922         return 0;
 923 }
 924 EXPORT_SYMBOL(bfin_free_exception);
 925
 926 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
 927 {
 928         switch (cplb_panic) {
 929         case CPLB_NO_UNLOCKED:
 930                 printk(KERN_EMERG "All CPLBs are locked\n");
 931                 break;
 932         case CPLB_PROT_VIOL:
 933                 return;
 934         case CPLB_NO_ADDR_MATCH:
 935                 return;
 936         case CPLB_UNKNOWN_ERR:
 937                 printk(KERN_EMERG "Unknown CPLB Exception\n");
 938                 break;
 939         }
 940
 941         oops_in_progress = 1;
 942
 943         printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void *)bfin_read_DCPLB_FAULT_ADDR());
 944         printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void *)bfin_read_ICPLB_FAULT_ADDR());
 945         dump_bfin_process(fp);
 946         dump_bfin_mem(fp);
 947         show_regs(fp);
 948         dump_stack();
 949         panic("Unrecoverable event\n");
 950 }