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