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   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 unsigned long saved_icplb_fault_addr, saved_dcplb_fault_addr;
  71
  72 int kstack_depth_to_print = 48;
  73
  74 static void decode_address(char *buf, unsigned long address)
  75 {
  76         struct vm_list_struct *vml;
  77         struct task_struct *p;
  78         struct mm_struct *mm;
  79         unsigned long flags, offset;
  80         unsigned char in_atomic = (bfin_read_IPEND() & 0x10) || in_atomic();
  81
  82 #ifdef CONFIG_KALLSYMS
  83         unsigned long symsize;
  84         const char *symname;
  85         char *modname;
  86         char *delim = ":";
  87         char namebuf[128];
  88
  89         /* look up the address and see if we are in kernel space */
  90         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
  91
  92         if (symname) {
  93                 /* yeah! kernel space! */
  94                 if (!modname)
  95                         modname = delim = "";
  96                 sprintf(buf, "<0x%p> { %s%s%s%s + 0x%lx }",
  97                               (void *)address, delim, modname, delim, symname,
  98                               (unsigned long)offset);
  99                 return;
 100
 101         }
 102 #endif
 103
 104         /* Problem in fixed code section? */
 105         if (address >= FIXED_CODE_START && address < FIXED_CODE_END) {
 106                 sprintf(buf, "<0x%p> /* Maybe fixed code section */", (void *)address);
 107                 return;
 108         }
 109
 110         /* Problem somewhere before the kernel start address */
 111         if (address < CONFIG_BOOT_LOAD) {
 112                 sprintf(buf, "<0x%p> /* Maybe null pointer? */", (void *)address);
 113                 return;
 114         }
 115
 116         /* looks like we're off in user-land, so let's walk all the
 117          * mappings of all our processes and see if we can't be a whee
 118          * bit more specific
 119          */
 120         write_lock_irqsave(&tasklist_lock, flags);
 121         for_each_process(p) {
 122                 mm = (in_atomic ? p->mm : get_task_mm(p));
 123                 if (!mm)
 124                         continue;
 125
 126                 vml = mm->context.vmlist;
 127                 while (vml) {
 128                         struct vm_area_struct *vma = vml->vma;
 129
 130                         if (address >= vma->vm_start && address < vma->vm_end) {
 131                                 char _tmpbuf[256];
 132                                 char *name = p->comm;
 133                                 struct file *file = vma->vm_file;
 134
 135                                 if (file)
 136                                         name = d_path(&file->f_path, _tmpbuf,
 137                                                       sizeof(_tmpbuf));
 138
 139                                 /* FLAT does not have its text aligned to the start of
 140                                  * the map while FDPIC ELF does ...
 141                                  */
 142
 143                                 /* before we can check flat/fdpic, we need to
 144                                  * make sure current is valid
 145                                  */
 146                                 if ((unsigned long)current >= FIXED_CODE_START &&
 147                                     !((unsigned long)current & 0x3)) {
 148                                         if (current->mm &&
 149                                             (address > current->mm->start_code) &&
 150                                             (address < current->mm->end_code))
 151                                                 offset = address - current->mm->start_code;
 152                                         else
 153                                                 offset = (address - vma->vm_start) +
 154                                                          (vma->vm_pgoff << PAGE_SHIFT);
 155
 156                                         sprintf(buf, "<0x%p> [ %s + 0x%lx ]",
 157                                                 (void *)address, name, offset);
 158                                 } else
 159                                         sprintf(buf, "<0x%p> [ %s vma:0x%lx-0x%lx]",
 160                                                 (void *)address, name,
 161                                                 vma->vm_start, vma->vm_end);
 162
 163                                 if (!in_atomic)
 164                                         mmput(mm);
 165
 166                                 goto done;
 167                         }
 168
 169                         vml = vml->next;
 170                 }
 171                 if (!in_atomic)
 172                         mmput(mm);
 173         }
 174
 175         /* we were unable to find this address anywhere */
 176         sprintf(buf, "<0x%p> /* unknown address */", (void *)address);
 177
 178 done:
 179         write_unlock_irqrestore(&tasklist_lock, flags);
 180 }
 181
 182 asmlinkage void double_fault_c(struct pt_regs *fp)
 183 {
 184         console_verbose();
 185         oops_in_progress = 1;
 186         printk(KERN_EMERG "\n" KERN_EMERG "Double Fault\n");
 187         dump_bfin_process(fp);
 188         dump_bfin_mem(fp);
 189         show_regs(fp);
 190         panic("Double Fault - unrecoverable event\n");
 191
 192 }
 193
 194 asmlinkage void trap_c(struct pt_regs *fp)
 195 {
 196 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 197         int j;
 198 #endif
 199         int sig = 0;
 200         siginfo_t info;
 201         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 202
 203         trace_buffer_save(j);
 204
 205         /* Important - be very careful dereferncing pointers - will lead to
 206          * double faults if the stack has become corrupt
 207          */
 208
 209         /* If the fault was caused by a kernel thread, or interrupt handler
 210          * we will kernel panic, so the system reboots.
 211          * If KGDB is enabled, don't set this for kernel breakpoints
 212         */
 213
 214         /* TODO: check to see if we are in some sort of deferred HWERR
 215          * that we should be able to recover from, not kernel panic
 216          */
 217         if ((bfin_read_IPEND() & 0xFFC0) && (trapnr != VEC_STEP)
 218 #ifdef CONFIG_KGDB
 219                 && (trapnr != VEC_EXCPT02)
 220 #endif
 221         ){
 222                 console_verbose();
 223                 oops_in_progress = 1;
 224         } else if (current) {
 225                 if (current->mm == NULL) {
 226                         console_verbose();
 227                         oops_in_progress = 1;
 228                 }
 229         }
 230
 231         /* trap_c() will be called for exceptions. During exceptions
 232          * processing, the pc value should be set with retx value.
 233          * With this change we can cleanup some code in signal.c- TODO
 234          */
 235         fp->orig_pc = fp->retx;
 236         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 237                 trapnr, fp->ipend, fp->pc, fp->retx); */
 238
 239         /* send the appropriate signal to the user program */
 240         switch (trapnr) {
 241
 242         /* This table works in conjuction with the one in ./mach-common/entry.S
 243          * Some exceptions are handled there (in assembly, in exception space)
 244          * Some are handled here, (in C, in interrupt space)
 245          * Some, like CPLB, are handled in both, where the normal path is
 246          * handled in assembly/exception space, and the error path is handled
 247          * here
 248          */
 249
 250         /* 0x00 - Linux Syscall, getting here is an error */
 251         /* 0x01 - userspace gdb breakpoint, handled here */
 252         case VEC_EXCPT01:
 253                 info.si_code = TRAP_ILLTRAP;
 254                 sig = SIGTRAP;
 255                 CHK_DEBUGGER_TRAP_MAYBE();
 256                 /* Check if this is a breakpoint in kernel space */
 257                 if (fp->ipend & 0xffc0)
 258                         return;
 259                 else
 260                         break;
 261 #ifdef CONFIG_KGDB
 262         case VEC_EXCPT02 :               /* gdb connection */
 263                 info.si_code = TRAP_ILLTRAP;
 264                 sig = SIGTRAP;
 265                 CHK_DEBUGGER_TRAP();
 266                 return;
 267 #else
 268         /* 0x02 - User Defined, Caught by default */
 269 #endif
 270         /* 0x03 - User Defined, userspace stack overflow */
 271         case VEC_EXCPT03:
 272                 info.si_code = SEGV_STACKFLOW;
 273                 sig = SIGSEGV;
 274                 printk(KERN_NOTICE EXC_0x03(KERN_NOTICE));
 275                 CHK_DEBUGGER_TRAP();
 276                 break;
 277         /* 0x04 - User Defined, Caught by default */
 278         /* 0x05 - User Defined, Caught by default */
 279         /* 0x06 - User Defined, Caught by default */
 280         /* 0x07 - User Defined, Caught by default */
 281         /* 0x08 - User Defined, Caught by default */
 282         /* 0x09 - User Defined, Caught by default */
 283         /* 0x0A - User Defined, Caught by default */
 284         /* 0x0B - User Defined, Caught by default */
 285         /* 0x0C - User Defined, Caught by default */
 286         /* 0x0D - User Defined, Caught by default */
 287         /* 0x0E - User Defined, Caught by default */
 288         /* 0x0F - User Defined, Caught by default */
 289         /* 0x10 HW Single step, handled here */
 290         case VEC_STEP:
 291                 info.si_code = TRAP_STEP;
 292                 sig = SIGTRAP;
 293                 CHK_DEBUGGER_TRAP_MAYBE();
 294                 /* Check if this is a single step in kernel space */
 295                 if (fp->ipend & 0xffc0)
 296                         return;
 297                 else
 298                         break;
 299         /* 0x11 - Trace Buffer Full, handled here */
 300         case VEC_OVFLOW:
 301                 info.si_code = TRAP_TRACEFLOW;
 302                 sig = SIGTRAP;
 303                 printk(KERN_NOTICE EXC_0x11(KERN_NOTICE));
 304                 CHK_DEBUGGER_TRAP();
 305                 break;
 306         /* 0x12 - Reserved, Caught by default */
 307         /* 0x13 - Reserved, Caught by default */
 308         /* 0x14 - Reserved, Caught by default */
 309         /* 0x15 - Reserved, Caught by default */
 310         /* 0x16 - Reserved, Caught by default */
 311         /* 0x17 - Reserved, Caught by default */
 312         /* 0x18 - Reserved, Caught by default */
 313         /* 0x19 - Reserved, Caught by default */
 314         /* 0x1A - Reserved, Caught by default */
 315         /* 0x1B - Reserved, Caught by default */
 316         /* 0x1C - Reserved, Caught by default */
 317         /* 0x1D - Reserved, Caught by default */
 318         /* 0x1E - Reserved, Caught by default */
 319         /* 0x1F - Reserved, Caught by default */
 320         /* 0x20 - Reserved, Caught by default */
 321         /* 0x21 - Undefined Instruction, handled here */
 322         case VEC_UNDEF_I:
 323                 info.si_code = ILL_ILLOPC;
 324                 sig = SIGILL;
 325                 printk(KERN_NOTICE EXC_0x21(KERN_NOTICE));
 326                 CHK_DEBUGGER_TRAP();
 327                 break;
 328         /* 0x22 - Illegal Instruction Combination, handled here */
 329         case VEC_ILGAL_I:
 330                 info.si_code = ILL_ILLPARAOP;
 331                 sig = SIGILL;
 332                 printk(KERN_NOTICE EXC_0x22(KERN_NOTICE));
 333                 CHK_DEBUGGER_TRAP();
 334                 break;
 335         /* 0x23 - Data CPLB protection violation, handled here */
 336         case VEC_CPLB_VL:
 337                 info.si_code = ILL_CPLB_VI;
 338                 sig = SIGBUS;
 339                 printk(KERN_NOTICE EXC_0x23(KERN_NOTICE));
 340                 CHK_DEBUGGER_TRAP();
 341                 break;
 342         /* 0x24 - Data access misaligned, handled here */
 343         case VEC_MISALI_D:
 344                 info.si_code = BUS_ADRALN;
 345                 sig = SIGBUS;
 346                 printk(KERN_NOTICE EXC_0x24(KERN_NOTICE));
 347                 CHK_DEBUGGER_TRAP();
 348                 break;
 349         /* 0x25 - Unrecoverable Event, handled here */
 350         case VEC_UNCOV:
 351                 info.si_code = ILL_ILLEXCPT;
 352                 sig = SIGILL;
 353                 printk(KERN_NOTICE EXC_0x25(KERN_NOTICE));
 354                 CHK_DEBUGGER_TRAP();
 355                 break;
 356         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 357                 error case is handled here */
 358         case VEC_CPLB_M:
 359                 info.si_code = BUS_ADRALN;
 360                 sig = SIGBUS;
 361                 printk(KERN_NOTICE EXC_0x26(KERN_NOTICE));
 362                 CHK_DEBUGGER_TRAP();
 363                 break;
 364         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 365         case VEC_CPLB_MHIT:
 366                 info.si_code = ILL_CPLB_MULHIT;
 367                 sig = SIGSEGV;
 368 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 369                 if (saved_dcplb_fault_addr < FIXED_CODE_START)
 370                         printk(KERN_NOTICE "NULL pointer access\n");
 371                 else
 372 #endif
 373                         printk(KERN_NOTICE EXC_0x27(KERN_NOTICE));
 374                 CHK_DEBUGGER_TRAP();
 375                 break;
 376         /* 0x28 - Emulation Watchpoint, handled here */
 377         case VEC_WATCH:
 378                 info.si_code = TRAP_WATCHPT;
 379                 sig = SIGTRAP;
 380                 pr_debug(EXC_0x28(KERN_DEBUG));
 381                 CHK_DEBUGGER_TRAP_MAYBE();
 382                 /* Check if this is a watchpoint in kernel space */
 383                 if (fp->ipend & 0xffc0)
 384                         return;
 385                 else
 386                         break;
 387 #ifdef CONFIG_BF535
 388         /* 0x29 - Instruction fetch access error (535 only) */
 389         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 390                 info.si_code = BUS_OPFETCH;
 391                 sig = SIGBUS;
 392                 printk(KERN_NOTICE "BF535: VEC_ISTRU_VL\n");
 393                 CHK_DEBUGGER_TRAP();
 394                 break;
 395 #else
 396         /* 0x29 - Reserved, Caught by default */
 397 #endif
 398         /* 0x2A - Instruction fetch misaligned, handled here */
 399         case VEC_MISALI_I:
 400                 info.si_code = BUS_ADRALN;
 401                 sig = SIGBUS;
 402                 printk(KERN_NOTICE EXC_0x2A(KERN_NOTICE));
 403                 CHK_DEBUGGER_TRAP();
 404                 break;
 405         /* 0x2B - Instruction CPLB protection violation, handled here */
 406         case VEC_CPLB_I_VL:
 407                 info.si_code = ILL_CPLB_VI;
 408                 sig = SIGBUS;
 409                 printk(KERN_NOTICE EXC_0x2B(KERN_NOTICE));
 410                 CHK_DEBUGGER_TRAP();
 411                 break;
 412         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 413         case VEC_CPLB_I_M:
 414                 info.si_code = ILL_CPLB_MISS;
 415                 sig = SIGBUS;
 416                 printk(KERN_NOTICE EXC_0x2C(KERN_NOTICE));
 417                 CHK_DEBUGGER_TRAP();
 418                 break;
 419         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 420         case VEC_CPLB_I_MHIT:
 421                 info.si_code = ILL_CPLB_MULHIT;
 422                 sig = SIGSEGV;
 423 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 424                 if (saved_icplb_fault_addr < FIXED_CODE_START)
 425                         printk(KERN_NOTICE "Jump to NULL address\n");
 426                 else
 427 #endif
 428                         printk(KERN_NOTICE EXC_0x2D(KERN_NOTICE));
 429                 CHK_DEBUGGER_TRAP();
 430                 break;
 431         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 432         case VEC_ILL_RES:
 433                 info.si_code = ILL_PRVOPC;
 434                 sig = SIGILL;
 435                 printk(KERN_NOTICE EXC_0x2E(KERN_NOTICE));
 436                 CHK_DEBUGGER_TRAP();
 437                 break;
 438         /* 0x2F - Reserved, Caught by default */
 439         /* 0x30 - Reserved, Caught by default */
 440         /* 0x31 - Reserved, Caught by default */
 441         /* 0x32 - Reserved, Caught by default */
 442         /* 0x33 - Reserved, Caught by default */
 443         /* 0x34 - Reserved, Caught by default */
 444         /* 0x35 - Reserved, Caught by default */
 445         /* 0x36 - Reserved, Caught by default */
 446         /* 0x37 - Reserved, Caught by default */
 447         /* 0x38 - Reserved, Caught by default */
 448         /* 0x39 - Reserved, Caught by default */
 449         /* 0x3A - Reserved, Caught by default */
 450         /* 0x3B - Reserved, Caught by default */
 451         /* 0x3C - Reserved, Caught by default */
 452         /* 0x3D - Reserved, Caught by default */
 453         /* 0x3E - Reserved, Caught by default */
 454         /* 0x3F - Reserved, Caught by default */
 455         case VEC_HWERR:
 456                 info.si_code = BUS_ADRALN;
 457                 sig = SIGBUS;
 458                 switch (fp->seqstat & SEQSTAT_HWERRCAUSE) {
 459                 /* System MMR Error */
 460                 case (SEQSTAT_HWERRCAUSE_SYSTEM_MMR):
 461                         info.si_code = BUS_ADRALN;
 462                         sig = SIGBUS;
 463                         printk(KERN_NOTICE HWC_x2(KERN_NOTICE));
 464                         break;
 465                 /* External Memory Addressing Error */
 466                 case (SEQSTAT_HWERRCAUSE_EXTERN_ADDR):
 467                         info.si_code = BUS_ADRERR;
 468                         sig = SIGBUS;
 469                         printk(KERN_NOTICE HWC_x3(KERN_NOTICE));
 470                         break;
 471                 /* Performance Monitor Overflow */
 472                 case (SEQSTAT_HWERRCAUSE_PERF_FLOW):
 473                         printk(KERN_NOTICE HWC_x12(KERN_NOTICE));
 474                         break;
 475                 /* RAISE 5 instruction */
 476                 case (SEQSTAT_HWERRCAUSE_RAISE_5):
 477                         printk(KERN_NOTICE HWC_x18(KERN_NOTICE));
 478                         break;
 479                 default:        /* Reserved */
 480                         printk(KERN_NOTICE HWC_default(KERN_NOTICE));
 481                         break;
 482                 }
 483                 CHK_DEBUGGER_TRAP();
 484                 break;
 485         default:
 486                 info.si_code = TRAP_ILLTRAP;
 487                 sig = SIGTRAP;
 488                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 489                         (fp->seqstat & SEQSTAT_EXCAUSE));
 490                 CHK_DEBUGGER_TRAP();
 491                 break;
 492         }
 493
 494         BUG_ON(sig == 0);
 495
 496         if (sig != SIGTRAP) {
 497                 unsigned long stack;
 498                 dump_bfin_process(fp);
 499                 dump_bfin_mem(fp);
 500                 show_regs(fp);
 501
 502                 /* Print out the trace buffer if it makes sense */
 503 #ifndef CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE
 504                 if (trapnr == VEC_CPLB_I_M || trapnr == VEC_CPLB_M)
 505                         printk(KERN_NOTICE "No trace since you do not have "
 506                                 "CONFIG_DEBUG_BFIN_NO_KERN_HWTRACE enabled\n"
 507                                 KERN_NOTICE "\n");
 508                 else
 509 #endif
 510                         dump_bfin_trace_buffer();
 511                 show_stack(current, &stack);
 512                 if (oops_in_progress) {
 513                         print_modules();
 514 #ifndef CONFIG_ACCESS_CHECK
 515                         printk(KERN_EMERG "Please turn on "
 516                                "CONFIG_ACCESS_CHECK\n");
 517 #endif
 518                         panic("Kernel exception");
 519                 }
 520         }
 521
 522         info.si_signo = sig;
 523         info.si_errno = 0;
 524         info.si_addr = (void __user *)fp->pc;
 525         force_sig_info(sig, &info, current);
 526
 527         trace_buffer_restore(j);
 528         return;
 529 }
 530
 531 /* Typical exception handling routines  */
 532
 533 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 534
 535 void dump_bfin_trace_buffer(void)
 536 {
 537 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 538         int tflags, i = 0;
 539         char buf[150];
 540 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 541         int j, index;
 542 #endif
 543
 544         trace_buffer_save(tflags);
 545
 546         printk(KERN_NOTICE "Hardware Trace:\n");
 547
 548         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 549                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 550                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 551                         printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 552                         decode_address(buf, (unsigned long)bfin_read_TBUF());
 553                         printk(KERN_NOTICE "     Source : %s\n", buf);
 554                 }
 555         }
 556
 557 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 558         if (trace_buff_offset)
 559                 index = trace_buff_offset/4 - 1;
 560         else
 561                 index = EXPAND_LEN;
 562
 563         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 564         while (j) {
 565                 decode_address(buf, software_trace_buff[index]);
 566                 printk(KERN_NOTICE "%4i Target : %s\n", i, buf);
 567                 index -= 1;
 568                 if (index < 0 )
 569                         index = EXPAND_LEN;
 570                 decode_address(buf, software_trace_buff[index]);
 571                 printk(KERN_NOTICE "     Source : %s\n", buf);
 572                 index -= 1;
 573                 if (index < 0)
 574                         index = EXPAND_LEN;
 575                 j--;
 576                 i++;
 577         }
 578 #endif
 579
 580         trace_buffer_restore(tflags);
 581 #endif
 582 }
 583 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 584
 585 static void show_trace(struct task_struct *tsk, unsigned long *sp)
 586 {
 587         unsigned long addr;
 588
 589         printk(KERN_NOTICE "\n" KERN_NOTICE "Call Trace:\n");
 590
 591         while (!kstack_end(sp)) {
 592                 addr = *sp++;
 593                 /*
 594                  * If the address is either in the text segment of the
 595                  * kernel, or in the region which contains vmalloc'ed
 596                  * memory, it *may* be the address of a calling
 597                  * routine; if so, print it so that someone tracing
 598                  * down the cause of the crash will be able to figure
 599                  * out the call path that was taken.
 600                  */
 601                 if (kernel_text_address(addr))
 602                         print_ip_sym(addr);
 603         }
 604
 605         printk(KERN_NOTICE "\n");
 606 }
 607
 608 void show_stack(struct task_struct *task, unsigned long *stack)
 609 {
 610         unsigned long *endstack, addr;
 611         int i;
 612
 613         /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
 614          * called externally in some places in the kernel.
 615          */
 616
 617         if (!stack) {
 618                 if (task)
 619                         stack = (unsigned long *)task->thread.ksp;
 620                 else
 621                         stack = (unsigned long *)&stack;
 622         }
 623
 624         addr = (unsigned long)stack;
 625         endstack = (unsigned long *)PAGE_ALIGN(addr);
 626
 627         printk(KERN_NOTICE "Stack from %08lx:", (unsigned long)stack);
 628         for (i = 0; i < kstack_depth_to_print; i++) {
 629                 if (stack + 1 > endstack)
 630                         break;
 631                 if (i % 8 == 0)
 632                         printk("\n" KERN_NOTICE "       ");
 633                 printk(" %08lx", *stack++);
 634         }
 635         printk("\n");
 636
 637         show_trace(task, stack);
 638 }
 639
 640 void dump_stack(void)
 641 {
 642         unsigned long stack;
 643 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 644         int tflags;
 645 #endif
 646         trace_buffer_save(tflags);
 647         dump_bfin_trace_buffer();
 648         show_stack(current, &stack);
 649         trace_buffer_restore(tflags);
 650 }
 651 EXPORT_SYMBOL(dump_stack);
 652
 653 void dump_bfin_process(struct pt_regs *fp)
 654 {
 655         /* We should be able to look at fp->ipend, but we don't push it on the
 656          * stack all the time, so do this until we fix that */
 657         unsigned int context = bfin_read_IPEND();
 658
 659         if (oops_in_progress)
 660                 printk(KERN_EMERG "Kernel OOPS in progress\n");
 661
 662         if (context & 0x0020 && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR)
 663                 printk(KERN_NOTICE "HW Error context\n");
 664         else if (context & 0x0020)
 665                 printk(KERN_NOTICE "Deferred Exception context\n");
 666         else if (context & 0x3FC0)
 667                 printk(KERN_NOTICE "Interrupt context\n");
 668         else if (context & 0x4000)
 669                 printk(KERN_NOTICE "Deferred Interrupt context\n");
 670         else if (context & 0x8000)
 671                 printk(KERN_NOTICE "Kernel process context\n");
 672
 673         /* Because we are crashing, and pointers could be bad, we check things
 674          * pretty closely before we use them
 675          */
 676         if ((unsigned long)current >= FIXED_CODE_START &&
 677             !((unsigned long)current & 0x3) && current->pid) {
 678                 printk(KERN_NOTICE "CURRENT PROCESS:\n");
 679                 if (current->comm >= (char *)FIXED_CODE_START)
 680                         printk(KERN_NOTICE "COMM=%s PID=%d\n",
 681                                 current->comm, current->pid);
 682                 else
 683                         printk(KERN_NOTICE "COMM= invalid\n");
 684
 685                 if (!((unsigned long)current->mm & 0x3) && (unsigned long)current->mm >= FIXED_CODE_START)
 686                         printk(KERN_NOTICE  "TEXT = 0x%p-0x%p        DATA = 0x%p-0x%p\n"
 687                                 KERN_NOTICE " BSS = 0x%p-0x%p  USER-STACK = 0x%p\n"
 688                                 KERN_NOTICE "\n",
 689                                 (void *)current->mm->start_code,
 690                                 (void *)current->mm->end_code,
 691                                 (void *)current->mm->start_data,
 692                                 (void *)current->mm->end_data,
 693                                 (void *)current->mm->end_data,
 694                                 (void *)current->mm->brk,
 695                                 (void *)current->mm->start_stack);
 696                 else
 697                         printk(KERN_NOTICE "invalid mm\n");
 698         } else
 699                 printk(KERN_NOTICE "\n" KERN_NOTICE
 700                      "No Valid process in current context\n");
 701 }
 702
 703 void dump_bfin_mem(struct pt_regs *fp)
 704 {
 705         unsigned short *addr, *erraddr, val = 0, err = 0;
 706         char sti = 0, buf[6];
 707
 708         erraddr = (void *)fp->pc;
 709
 710         printk(KERN_NOTICE "return address: [0x%p]; contents of:", erraddr);
 711
 712         for (addr = (unsigned short *)((unsigned long)erraddr & ~0xF) - 0x10;
 713              addr < (unsigned short *)((unsigned long)erraddr & ~0xF) + 0x10;
 714              addr++) {
 715                 if (!((unsigned long)addr & 0xF))
 716                         printk("\n" KERN_NOTICE "0x%p: ", addr);
 717
 718                 if (get_user(val, addr)) {
 719                         if (addr >= (unsigned short *)L1_CODE_START &&
 720                             addr < (unsigned short *)(L1_CODE_START + L1_CODE_LENGTH)) {
 721                                 dma_memcpy(&val, addr, sizeof(val));
 722                                 sprintf(buf, "%04x", val);
 723                         } else if (addr >= (unsigned short *)FIXED_CODE_START &&
 724                                 addr <= (unsigned short *)memory_start) {
 725                                 val = bfin_read16(addr);
 726                                 sprintf(buf, "%04x", val);
 727                         } else {
 728                                 val = 0;
 729                                 sprintf(buf, "????");
 730                         }
 731                 } else
 732                         sprintf(buf, "%04x", val);
 733
 734                 if (addr == erraddr) {
 735                         printk("[%s]", buf);
 736                         err = val;
 737                 } else
 738                         printk(" %s ", buf);
 739
 740                 /* Do any previous instructions turn on interrupts? */
 741                 if (addr <= erraddr &&                          /* in the past */
 742                     ((val >= 0x0040 && val <= 0x0047) ||        /* STI instruction */
 743                       val == 0x017b))                           /* [SP++] = RETI */
 744                         sti = 1;
 745         }
 746
 747         printk("\n");
 748
 749         /* Hardware error interrupts can be deferred */
 750         if (unlikely(sti && (fp->seqstat & SEQSTAT_EXCAUSE) == VEC_HWERR &&
 751             oops_in_progress)){
 752                 printk(KERN_NOTICE "Looks like this was a deferred error - sorry\n");
 753 #ifndef CONFIG_DEBUG_HWERR
 754                 printk(KERN_NOTICE "The remaining message may be meaningless\n"
 755                         KERN_NOTICE "You should enable CONFIG_DEBUG_HWERR to get a"
 756                          " better idea where it came from\n");
 757 #else
 758                 /* If we are handling only one peripheral interrupt
 759                  * and current mm and pid are valid, and the last error
 760                  * was in that user space process's text area
 761                  * print it out - because that is where the problem exists
 762                  */
 763                 if ((!(((fp)->ipend & ~0x30) & (((fp)->ipend & ~0x30) - 1))) &&
 764                      (current->pid && current->mm)) {
 765                         /* And the last RETI points to the current userspace context */
 766                         if ((fp + 1)->pc >= current->mm->start_code &&
 767                             (fp + 1)->pc <= current->mm->end_code) {
 768                                 printk(KERN_NOTICE "It might be better to look around here : \n");
 769                                 printk(KERN_NOTICE "-------------------------------------------\n");
 770                                 show_regs(fp + 1);
 771                                 printk(KERN_NOTICE "-------------------------------------------\n");
 772                         }
 773                 }
 774 #endif
 775         }
 776 }
 777
 778 void show_regs(struct pt_regs *fp)
 779 {
 780         char buf [150];
 781         struct irqaction *action;
 782         unsigned int i;
 783         unsigned long flags;
 784
 785         printk(KERN_NOTICE "\n" KERN_NOTICE "SEQUENCER STATUS:\t\t%s\n", print_tainted());
 786         printk(KERN_NOTICE " SEQSTAT: %08lx  IPEND: %04lx  SYSCFG: %04lx\n",
 787                 (long)fp->seqstat, fp->ipend, fp->syscfg);
 788         printk(KERN_NOTICE "  HWERRCAUSE: 0x%lx\n",
 789                 (fp->seqstat & SEQSTAT_HWERRCAUSE) >> 14);
 790         printk(KERN_NOTICE "  EXCAUSE   : 0x%lx\n",
 791                 fp->seqstat & SEQSTAT_EXCAUSE);
 792         for (i = 6; i <= 15 ; i++) {
 793                 if (fp->ipend & (1 << i)) {
 794                         decode_address(buf, bfin_read32(EVT0 + 4*i));
 795                         printk(KERN_NOTICE "  physical IVG%i asserted : %s\n", i, buf);
 796                 }
 797         }
 798
 799         /* if no interrupts are going off, don't print this out */
 800         if (fp->ipend & ~0x3F) {
 801                 for (i = 0; i < (NR_IRQS - 1); i++) {
 802                         spin_lock_irqsave(&irq_desc[i].lock, flags);
 803                         action = irq_desc[i].action;
 804                         if (!action)
 805                                 goto unlock;
 806
 807                         decode_address(buf, (unsigned int)action->handler);
 808                         printk(KERN_NOTICE "  logical irq %3d mapped  : %s", i, buf);
 809                         for (action = action->next; action; action = action->next) {
 810                                 decode_address(buf, (unsigned int)action->handler);
 811                                 printk(", %s", buf);
 812                         }
 813                         printk("\n");
 814 unlock:
 815                         spin_unlock_irqrestore(&irq_desc[i].lock, flags);
 816                 }
 817         }
 818
 819         decode_address(buf, fp->rete);
 820         printk(KERN_NOTICE " RETE: %s\n", buf);
 821         decode_address(buf, fp->retn);
 822         printk(KERN_NOTICE " RETN: %s\n", buf);
 823         decode_address(buf, fp->retx);
 824         printk(KERN_NOTICE " RETX: %s\n", buf);
 825         decode_address(buf, fp->rets);
 826         printk(KERN_NOTICE " RETS: %s\n", buf);
 827         decode_address(buf, fp->pc);
 828         printk(KERN_NOTICE " PC  : %s\n", buf);
 829
 830         if (((long)fp->seqstat &  SEQSTAT_EXCAUSE) &&
 831             (((long)fp->seqstat & SEQSTAT_EXCAUSE) != VEC_HWERR)) {
 832                 decode_address(buf, saved_dcplb_fault_addr);
 833                 printk(KERN_NOTICE "DCPLB_FAULT_ADDR: %s\n", buf);
 834                 decode_address(buf, saved_icplb_fault_addr);
 835                 printk(KERN_NOTICE "ICPLB_FAULT_ADDR: %s\n", buf);
 836         }
 837
 838         printk(KERN_NOTICE "\n" KERN_NOTICE "PROCESSOR STATE:\n");
 839         printk(KERN_NOTICE " R0 : %08lx    R1 : %08lx    R2 : %08lx    R3 : %08lx\n",
 840                 fp->r0, fp->r1, fp->r2, fp->r3);
 841         printk(KERN_NOTICE " R4 : %08lx    R5 : %08lx    R6 : %08lx    R7 : %08lx\n",
 842                 fp->r4, fp->r5, fp->r6, fp->r7);
 843         printk(KERN_NOTICE " P0 : %08lx    P1 : %08lx    P2 : %08lx    P3 : %08lx\n",
 844                 fp->p0, fp->p1, fp->p2, fp->p3);
 845         printk(KERN_NOTICE " P4 : %08lx    P5 : %08lx    FP : %08lx    SP : %08lx\n",
 846                 fp->p4, fp->p5, fp->fp, (long)fp);
 847         printk(KERN_NOTICE " LB0: %08lx    LT0: %08lx    LC0: %08lx\n",
 848                 fp->lb0, fp->lt0, fp->lc0);
 849         printk(KERN_NOTICE " LB1: %08lx    LT1: %08lx    LC1: %08lx\n",
 850                 fp->lb1, fp->lt1, fp->lc1);
 851         printk(KERN_NOTICE " B0 : %08lx    L0 : %08lx    M0 : %08lx    I0 : %08lx\n",
 852                 fp->b0, fp->l0, fp->m0, fp->i0);
 853         printk(KERN_NOTICE " B1 : %08lx    L1 : %08lx    M1 : %08lx    I1 : %08lx\n",
 854                 fp->b1, fp->l1, fp->m1, fp->i1);
 855         printk(KERN_NOTICE " B2 : %08lx    L2 : %08lx    M2 : %08lx    I2 : %08lx\n",
 856                 fp->b2, fp->l2, fp->m2, fp->i2);
 857         printk(KERN_NOTICE " B3 : %08lx    L3 : %08lx    M3 : %08lx    I3 : %08lx\n",
 858                 fp->b3, fp->l3, fp->m3, fp->i3);
 859         printk(KERN_NOTICE "A0.w: %08lx   A0.x: %08lx   A1.w: %08lx   A1.x: %08lx\n",
 860                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
 861
 862         printk(KERN_NOTICE "USP : %08lx  ASTAT: %08lx\n",
 863                 rdusp(), fp->astat);
 864
 865         printk(KERN_NOTICE "\n");
 866 }
 867
 868 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
 869 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
 870 #endif
 871
 872 asmlinkage int sys_bfin_spinlock(int *spinlock)
 873 {
 874         int ret = 0;
 875         int tmp = 0;
 876
 877         local_irq_disable();
 878         ret = get_user(tmp, spinlock);
 879         if (ret == 0) {
 880                 if (tmp)
 881                         ret = 1;
 882                 tmp = 1;
 883                 put_user(tmp, spinlock);
 884         }
 885         local_irq_enable();
 886         return ret;
 887 }
 888
 889 int bfin_request_exception(unsigned int exception, void (*handler)(void))
 890 {
 891         void (*curr_handler)(void);
 892
 893         if (exception > 0x3F)
 894                 return -EINVAL;
 895
 896         curr_handler = ex_table[exception];
 897
 898         if (curr_handler != ex_replaceable)
 899                 return -EBUSY;
 900
 901         ex_table[exception] = handler;
 902
 903         return 0;
 904 }
 905 EXPORT_SYMBOL(bfin_request_exception);
 906
 907 int bfin_free_exception(unsigned int exception, void (*handler)(void))
 908 {
 909         void (*curr_handler)(void);
 910
 911         if (exception > 0x3F)
 912                 return -EINVAL;
 913
 914         curr_handler = ex_table[exception];
 915
 916         if (curr_handler != handler)
 917                 return -EBUSY;
 918
 919         ex_table[exception] = ex_replaceable;
 920
 921         return 0;
 922 }
 923 EXPORT_SYMBOL(bfin_free_exception);
 924
 925 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
 926 {
 927         switch (cplb_panic) {
 928         case CPLB_NO_UNLOCKED:
 929                 printk(KERN_EMERG "All CPLBs are locked\n");
 930                 break;
 931         case CPLB_PROT_VIOL:
 932                 return;
 933         case CPLB_NO_ADDR_MATCH:
 934                 return;
 935         case CPLB_UNKNOWN_ERR:
 936                 printk(KERN_EMERG "Unknown CPLB Exception\n");
 937                 break;
 938         }
 939
 940         oops_in_progress = 1;
 941
 942         dump_bfin_process(fp);
 943         dump_bfin_mem(fp);
 944         show_regs(fp);
 945         dump_stack();
 946         panic("Unrecoverable event\n");
 947 }