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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 <asm/trace.h>
  40
  41 #ifdef CONFIG_KGDB
  42 # include <linux/debugger.h>
  43 # include <linux/kgdb.h>
  44 #endif
  45
  46 /* Initiate the event table handler */
  47 void __init trap_init(void)
  48 {
  49         CSYNC();
  50         bfin_write_EVT3(trap);
  51         CSYNC();
  52 }
  53
  54 int kstack_depth_to_print = 48;
  55
  56 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
  57 static int printk_address(unsigned long address)
  58 {
  59         struct vm_list_struct *vml;
  60         struct task_struct *p;
  61         struct mm_struct *mm;
  62         unsigned long offset;
  63
  64 #ifdef CONFIG_KALLSYMS
  65         unsigned long symsize;
  66         const char *symname;
  67         char *modname;
  68         char *delim = ":";
  69         char namebuf[128];
  70
  71         /* look up the address and see if we are in kernel space */
  72         symname = kallsyms_lookup(address, &symsize, &offset, &modname, namebuf);
  73
  74         if (symname) {
  75                 /* yeah! kernel space! */
  76                 if (!modname)
  77                         modname = delim = "";
  78                 return printk("<0x%p> { %s%s%s%s + 0x%lx }",
  79                               (void *)address, delim, modname, delim, symname,
  80                               (unsigned long)offset);
  81
  82         }
  83 #endif
  84
  85         /* looks like we're off in user-land, so let's walk all the
  86          * mappings of all our processes and see if we can't be a whee
  87          * bit more specific
  88          */
  89         write_lock_irq(&tasklist_lock);
  90         for_each_process(p) {
  91                 mm = get_task_mm(p);
  92                 if (!mm)
  93                         continue;
  94
  95                 vml = mm->context.vmlist;
  96                 while (vml) {
  97                         struct vm_area_struct *vma = vml->vma;
  98
  99                         if (address >= vma->vm_start && address < vma->vm_end) {
 100                                 char *name = p->comm;
 101                                 struct file *file = vma->vm_file;
 102                                 if (file) {
 103                                         char _tmpbuf[256];
 104                                         name = d_path(file->f_dentry,
 105                                                       file->f_vfsmnt,
 106                                                       _tmpbuf,
 107                                                       sizeof(_tmpbuf));
 108                                 }
 109
 110                                 /* FLAT does not have its text aligned to the start of
 111                                  * the map while FDPIC ELF does ...
 112                                  */
 113                                 if (current->mm &&
 114                                     (address > current->mm->start_code) &&
 115                                     (address < current->mm->end_code))
 116                                         offset = address - current->mm->start_code;
 117                                 else
 118                                         offset = (address - vma->vm_start) + (vma->vm_pgoff << PAGE_SHIFT);
 119
 120                                 write_unlock_irq(&tasklist_lock);
 121                                 return printk("<0x%p> [ %s + 0x%lx ]",
 122                                               (void *)address, name, offset);
 123                         }
 124
 125                         vml = vml->next;
 126                 }
 127         }
 128         write_unlock_irq(&tasklist_lock);
 129
 130         /* we were unable to find this address anywhere */
 131         return printk("[<0x%p>]", (void *)address);
 132 }
 133 #endif
 134
 135 asmlinkage void trap_c(struct pt_regs *fp)
 136 {
 137 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 138         int j;
 139 #endif
 140         int sig = 0;
 141         siginfo_t info;
 142         unsigned long trapnr = fp->seqstat & SEQSTAT_EXCAUSE;
 143
 144 #ifdef CONFIG_KGDB
 145 # define CHK_DEBUGGER_TRAP() \
 146         do { \
 147                 CHK_DEBUGGER(trapnr, sig, info.si_code, fp, ); \
 148         } while (0)
 149 # define CHK_DEBUGGER_TRAP_MAYBE() \
 150         do { \
 151                 if (kgdb_connected) \
 152                         CHK_DEBUGGER_TRAP(); \
 153         } while (0)
 154 #else
 155 # define CHK_DEBUGGER_TRAP() do { } while (0)
 156 # define CHK_DEBUGGER_TRAP_MAYBE() do { } while (0)
 157 #endif
 158
 159         trace_buffer_save(j);
 160
 161         /* trap_c() will be called for exceptions. During exceptions
 162          * processing, the pc value should be set with retx value.
 163          * With this change we can cleanup some code in signal.c- TODO
 164          */
 165         fp->orig_pc = fp->retx;
 166         /* printk("exception: 0x%x, ipend=%x, reti=%x, retx=%x\n",
 167                 trapnr, fp->ipend, fp->pc, fp->retx); */
 168
 169         /* send the appropriate signal to the user program */
 170         switch (trapnr) {
 171
 172         /* This table works in conjuction with the one in ./mach-common/entry.S
 173          * Some exceptions are handled there (in assembly, in exception space)
 174          * Some are handled here, (in C, in interrupt space)
 175          * Some, like CPLB, are handled in both, where the normal path is
 176          * handled in assembly/exception space, and the error path is handled
 177          * here
 178          */
 179
 180         /* 0x00 - Linux Syscall, getting here is an error */
 181         /* 0x01 - userspace gdb breakpoint, handled here */
 182         case VEC_EXCPT01:
 183                 info.si_code = TRAP_ILLTRAP;
 184                 sig = SIGTRAP;
 185                 CHK_DEBUGGER_TRAP_MAYBE();
 186                 /* Check if this is a breakpoint in kernel space */
 187                 if (fp->ipend & 0xffc0)
 188                         return;
 189                 else
 190                         break;
 191 #ifdef CONFIG_KGDB
 192         case VEC_EXCPT02 :               /* gdb connection */
 193                 info.si_code = TRAP_ILLTRAP;
 194                 sig = SIGTRAP;
 195                 CHK_DEBUGGER_TRAP();
 196                 return;
 197 #else
 198         /* 0x02 - User Defined, Caught by default */
 199 #endif
 200         /* 0x03 - User Defined, userspace stack overflow */
 201         case VEC_EXCPT03:
 202                 info.si_code = SEGV_STACKFLOW;
 203                 sig = SIGSEGV;
 204                 printk(KERN_EMERG EXC_0x03);
 205                 CHK_DEBUGGER_TRAP();
 206                 break;
 207         /* 0x04 - User Defined, Caught by default */
 208         /* 0x05 - User Defined, Caught by default */
 209         /* 0x06 - User Defined, Caught by default */
 210         /* 0x07 - User Defined, Caught by default */
 211         /* 0x08 - User Defined, Caught by default */
 212         /* 0x09 - User Defined, Caught by default */
 213         /* 0x0A - User Defined, Caught by default */
 214         /* 0x0B - User Defined, Caught by default */
 215         /* 0x0C - User Defined, Caught by default */
 216         /* 0x0D - User Defined, Caught by default */
 217         /* 0x0E - User Defined, Caught by default */
 218         /* 0x0F - User Defined, Caught by default */
 219         /* 0x10 HW Single step, handled here */
 220         case VEC_STEP:
 221                 info.si_code = TRAP_STEP;
 222                 sig = SIGTRAP;
 223                 CHK_DEBUGGER_TRAP_MAYBE();
 224                 /* Check if this is a single step in kernel space */
 225                 if (fp->ipend & 0xffc0)
 226                         return;
 227                 else
 228                         break;
 229         /* 0x11 - Trace Buffer Full, handled here */
 230         case VEC_OVFLOW:
 231                 info.si_code = TRAP_TRACEFLOW;
 232                 sig = SIGTRAP;
 233                 printk(KERN_EMERG EXC_0x11);
 234                 CHK_DEBUGGER_TRAP();
 235                 break;
 236         /* 0x12 - Reserved, Caught by default */
 237         /* 0x13 - Reserved, Caught by default */
 238         /* 0x14 - Reserved, Caught by default */
 239         /* 0x15 - Reserved, Caught by default */
 240         /* 0x16 - Reserved, Caught by default */
 241         /* 0x17 - Reserved, Caught by default */
 242         /* 0x18 - Reserved, Caught by default */
 243         /* 0x19 - Reserved, Caught by default */
 244         /* 0x1A - Reserved, Caught by default */
 245         /* 0x1B - Reserved, Caught by default */
 246         /* 0x1C - Reserved, Caught by default */
 247         /* 0x1D - Reserved, Caught by default */
 248         /* 0x1E - Reserved, Caught by default */
 249         /* 0x1F - Reserved, Caught by default */
 250         /* 0x20 - Reserved, Caught by default */
 251         /* 0x21 - Undefined Instruction, handled here */
 252         case VEC_UNDEF_I:
 253                 info.si_code = ILL_ILLOPC;
 254                 sig = SIGILL;
 255                 printk(KERN_EMERG EXC_0x21);
 256                 CHK_DEBUGGER_TRAP();
 257                 break;
 258         /* 0x22 - Illegal Instruction Combination, handled here */
 259         case VEC_ILGAL_I:
 260                 info.si_code = ILL_ILLPARAOP;
 261                 sig = SIGILL;
 262                 printk(KERN_EMERG EXC_0x22);
 263                 CHK_DEBUGGER_TRAP();
 264                 break;
 265         /* 0x23 - Data CPLB Protection Violation,
 266                  normal case is handled in _cplb_hdr */
 267         case VEC_CPLB_VL:
 268                 info.si_code = ILL_CPLB_VI;
 269                 sig = SIGILL;
 270                 printk(KERN_EMERG EXC_0x23);
 271                 CHK_DEBUGGER_TRAP();
 272                 break;
 273         /* 0x24 - Data access misaligned, handled here */
 274         case VEC_MISALI_D:
 275                 info.si_code = BUS_ADRALN;
 276                 sig = SIGBUS;
 277                 printk(KERN_EMERG EXC_0x24);
 278                 CHK_DEBUGGER_TRAP();
 279                 break;
 280         /* 0x25 - Unrecoverable Event, handled here */
 281         case VEC_UNCOV:
 282                 info.si_code = ILL_ILLEXCPT;
 283                 sig = SIGILL;
 284                 printk(KERN_EMERG EXC_0x25);
 285                 CHK_DEBUGGER_TRAP();
 286                 break;
 287         /* 0x26 - Data CPLB Miss, normal case is handled in _cplb_hdr,
 288                 error case is handled here */
 289         case VEC_CPLB_M:
 290                 info.si_code = BUS_ADRALN;
 291                 sig = SIGBUS;
 292                 printk(KERN_EMERG EXC_0x26);
 293                 CHK_DEBUGGER_TRAP();
 294                 break;
 295         /* 0x27 - Data CPLB Multiple Hits - Linux Trap Zero, handled here */
 296         case VEC_CPLB_MHIT:
 297                 info.si_code = ILL_CPLB_MULHIT;
 298 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 299                 sig = SIGSEGV;
 300                 printk(KERN_EMERG "\n"
 301                         KERN_EMERG "NULL pointer access (probably)\n");
 302 #else
 303                 sig = SIGILL;
 304                 printk(KERN_EMERG EXC_0x27);
 305 #endif
 306                 CHK_DEBUGGER_TRAP();
 307                 break;
 308         /* 0x28 - Emulation Watchpoint, handled here */
 309         case VEC_WATCH:
 310                 info.si_code = TRAP_WATCHPT;
 311                 sig = SIGTRAP;
 312                 pr_debug(EXC_0x28);
 313                 CHK_DEBUGGER_TRAP_MAYBE();
 314                 /* Check if this is a watchpoint in kernel space */
 315                 if (fp->ipend & 0xffc0)
 316                         return;
 317                 else
 318                         break;
 319 #ifdef CONFIG_BF535
 320         /* 0x29 - Instruction fetch access error (535 only) */
 321         case VEC_ISTRU_VL:      /* ADSP-BF535 only (MH) */
 322                 info.si_code = BUS_OPFETCH;
 323                 sig = SIGBUS;
 324                 printk(KERN_EMERG "BF535: VEC_ISTRU_VL\n");
 325                 CHK_DEBUGGER_TRAP();
 326                 break;
 327 #else
 328         /* 0x29 - Reserved, Caught by default */
 329 #endif
 330         /* 0x2A - Instruction fetch misaligned, handled here */
 331         case VEC_MISALI_I:
 332                 info.si_code = BUS_ADRALN;
 333                 sig = SIGBUS;
 334                 printk(KERN_EMERG EXC_0x2A);
 335                 CHK_DEBUGGER_TRAP();
 336                 break;
 337         /* 0x2B - Instruction CPLB protection Violation,
 338                 handled in _cplb_hdr */
 339         case VEC_CPLB_I_VL:
 340                 info.si_code = ILL_CPLB_VI;
 341                 sig = SIGILL;
 342                 printk(KERN_EMERG EXC_0x2B);
 343                 CHK_DEBUGGER_TRAP();
 344                 break;
 345         /* 0x2C - Instruction CPLB miss, handled in _cplb_hdr */
 346         case VEC_CPLB_I_M:
 347                 info.si_code = ILL_CPLB_MISS;
 348                 sig = SIGBUS;
 349                 printk(KERN_EMERG EXC_0x2C);
 350                 CHK_DEBUGGER_TRAP();
 351                 break;
 352         /* 0x2D - Instruction CPLB Multiple Hits, handled here */
 353         case VEC_CPLB_I_MHIT:
 354                 info.si_code = ILL_CPLB_MULHIT;
 355 #ifdef CONFIG_DEBUG_HUNT_FOR_ZERO
 356                 sig = SIGSEGV;
 357                 printk(KERN_EMERG "\n\nJump to address 0 - 0x0fff\n");
 358 #else
 359                 sig = SIGILL;
 360                 printk(KERN_EMERG EXC_0x2D);
 361 #endif
 362                 CHK_DEBUGGER_TRAP();
 363                 break;
 364         /* 0x2E - Illegal use of Supervisor Resource, handled here */
 365         case VEC_ILL_RES:
 366                 info.si_code = ILL_PRVOPC;
 367                 sig = SIGILL;
 368                 printk(KERN_EMERG EXC_0x2E);
 369                 CHK_DEBUGGER_TRAP();
 370                 break;
 371         /* 0x2F - Reserved, Caught by default */
 372         /* 0x30 - Reserved, Caught by default */
 373         /* 0x31 - Reserved, Caught by default */
 374         /* 0x32 - Reserved, Caught by default */
 375         /* 0x33 - Reserved, Caught by default */
 376         /* 0x34 - Reserved, Caught by default */
 377         /* 0x35 - Reserved, Caught by default */
 378         /* 0x36 - Reserved, Caught by default */
 379         /* 0x37 - Reserved, Caught by default */
 380         /* 0x38 - Reserved, Caught by default */
 381         /* 0x39 - Reserved, Caught by default */
 382         /* 0x3A - Reserved, Caught by default */
 383         /* 0x3B - Reserved, Caught by default */
 384         /* 0x3C - Reserved, Caught by default */
 385         /* 0x3D - Reserved, Caught by default */
 386         /* 0x3E - Reserved, Caught by default */
 387         /* 0x3F - Reserved, Caught by default */
 388         default:
 389                 info.si_code = TRAP_ILLTRAP;
 390                 sig = SIGTRAP;
 391                 printk(KERN_EMERG "Caught Unhandled Exception, code = %08lx\n",
 392                         (fp->seqstat & SEQSTAT_EXCAUSE));
 393                 CHK_DEBUGGER_TRAP();
 394                 break;
 395         }
 396
 397         info.si_signo = sig;
 398         info.si_errno = 0;
 399         info.si_addr = (void *)fp->pc;
 400         force_sig_info(sig, &info, current);
 401         if (sig != 0 && sig != SIGTRAP) {
 402                 unsigned long stack;
 403                 dump_bfin_regs(fp, (void *)fp->retx);
 404                 dump_bfin_trace_buffer();
 405                 show_stack(current, &stack);
 406                 if (current->mm == NULL)
 407                         panic("Kernel exception");
 408         }
 409
 410         /* if the address that we are about to return to is not valid, set it
 411          * to a valid address, if we have a current application or panic
 412          */
 413         if (!(fp->pc <= physical_mem_end
 414 #if L1_CODE_LENGTH != 0
 415             || (fp->pc >= L1_CODE_START &&
 416                 fp->pc <= (L1_CODE_START + L1_CODE_LENGTH))
 417 #endif
 418         )) {
 419                 if (current->mm) {
 420                         fp->pc = current->mm->start_code;
 421                 } else {
 422                         printk(KERN_EMERG
 423                                 "I can't return to memory that doesn't exist"
 424                                 " - bad things happen\n");
 425                         panic("Help - I've fallen and can't get up\n");
 426                 }
 427         }
 428
 429         trace_buffer_restore(j);
 430         return;
 431 }
 432
 433 /* Typical exception handling routines  */
 434
 435 #define EXPAND_LEN ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 256 - 1)
 436
 437 void dump_bfin_trace_buffer(void)
 438 {
 439 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 440         int tflags, i = 0;
 441 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 442         int j, index;
 443 #endif
 444
 445         trace_buffer_save(tflags);
 446
 447         printk(KERN_EMERG "Hardware Trace:\n");
 448
 449         if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
 450                 for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
 451                         printk(KERN_EMERG "%4i Target : ", i);
 452                         printk_address((unsigned long)bfin_read_TBUF());
 453                         printk("\n" KERN_EMERG "     Source : ");
 454                         printk_address((unsigned long)bfin_read_TBUF());
 455                         printk("\n");
 456                 }
 457         }
 458
 459 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
 460         if (trace_buff_offset)
 461                 index = trace_buff_offset/4 - 1;
 462         else
 463                 index = EXPAND_LEN;
 464
 465         j = (1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN) * 128;
 466         while (j) {
 467                 printk(KERN_EMERG "%4i Target : ", i);
 468                 printk_address(software_trace_buff[index]);
 469                 index -= 1;
 470                 if (index < 0 )
 471                         index = EXPAND_LEN;
 472                 printk("\n" KERN_EMERG "     Source : ");
 473                 printk_address(software_trace_buff[index]);
 474                 index -= 1;
 475                 if (index < 0)
 476                         index = EXPAND_LEN;
 477                 printk("\n");
 478                 j--;
 479                 i++;
 480         }
 481 #endif
 482
 483         trace_buffer_restore(tflags);
 484 #endif
 485 }
 486 EXPORT_SYMBOL(dump_bfin_trace_buffer);
 487
 488 static void show_trace(struct task_struct *tsk, unsigned long *sp)
 489 {
 490         unsigned long addr;
 491
 492         printk("\nCall Trace:");
 493 #ifdef CONFIG_KALLSYMS
 494         printk("\n");
 495 #endif
 496
 497         while (!kstack_end(sp)) {
 498                 addr = *sp++;
 499                 /*
 500                  * If the address is either in the text segment of the
 501                  * kernel, or in the region which contains vmalloc'ed
 502                  * memory, it *may* be the address of a calling
 503                  * routine; if so, print it so that someone tracing
 504                  * down the cause of the crash will be able to figure
 505                  * out the call path that was taken.
 506                  */
 507                 if (kernel_text_address(addr))
 508                         print_ip_sym(addr);
 509         }
 510
 511         printk("\n");
 512 }
 513
 514 void show_stack(struct task_struct *task, unsigned long *stack)
 515 {
 516         unsigned long *endstack, addr;
 517         int i;
 518
 519         /* Cannot call dump_bfin_trace_buffer() here as show_stack() is
 520          * called externally in some places in the kernel.
 521          */
 522
 523         if (!stack) {
 524                 if (task)
 525                         stack = (unsigned long *)task->thread.ksp;
 526                 else
 527                         stack = (unsigned long *)&stack;
 528         }
 529
 530         addr = (unsigned long)stack;
 531         endstack = (unsigned long *)PAGE_ALIGN(addr);
 532
 533         printk(KERN_EMERG "Stack from %08lx:", (unsigned long)stack);
 534         for (i = 0; i < kstack_depth_to_print; i++) {
 535                 if (stack + 1 > endstack)
 536                         break;
 537                 if (i % 8 == 0)
 538                         printk("\n" KERN_EMERG "       ");
 539                 printk(" %08lx", *stack++);
 540         }
 541
 542         show_trace(task, stack);
 543 }
 544
 545 void dump_stack(void)
 546 {
 547         unsigned long stack;
 548 #ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
 549         int tflags;
 550 #endif
 551         trace_buffer_save(tflags);
 552         dump_bfin_trace_buffer();
 553         show_stack(current, &stack);
 554         trace_buffer_restore(tflags);
 555 }
 556
 557 EXPORT_SYMBOL(dump_stack);
 558
 559 void dump_bfin_regs(struct pt_regs *fp, void *retaddr)
 560 {
 561         if (current->pid) {
 562                 printk(KERN_EMERG "\n" KERN_EMERG "CURRENT PROCESS:\n"
 563                         KERN_EMERG "\n");
 564                 printk(KERN_EMERG "COMM=%s PID=%d\n",
 565                         current->comm, current->pid);
 566         } else {
 567                 printk
 568                     (KERN_EMERG "\n" KERN_EMERG
 569                      "No Valid pid - Either things are really messed up,"
 570                      " or you are in the kernel\n");
 571         }
 572
 573         if (current->mm) {
 574                 printk(KERN_EMERG "TEXT = 0x%p-0x%p  DATA = 0x%p-0x%p\n"
 575                        KERN_EMERG "BSS = 0x%p-0x%p   USER-STACK = 0x%p\n"
 576                        KERN_EMERG "\n",
 577                        (void *)current->mm->start_code,
 578                        (void *)current->mm->end_code,
 579                        (void *)current->mm->start_data,
 580                        (void *)current->mm->end_data,
 581                        (void *)current->mm->end_data,
 582                        (void *)current->mm->brk,
 583                        (void *)current->mm->start_stack);
 584         }
 585
 586         printk(KERN_EMERG "return address: [0x%p]; contents of:", retaddr);
 587         if (retaddr != 0 && retaddr <= (void *)physical_mem_end
 588 #if L1_CODE_LENGTH != 0
 589             /* FIXME: Copy the code out of L1 Instruction SRAM through dma
 590                memcpy.  */
 591             && !(retaddr >= (void *)L1_CODE_START
 592                  && retaddr < (void *)(L1_CODE_START + L1_CODE_LENGTH))
 593 #endif
 594         ) {
 595                 int i = ((unsigned int)retaddr & 0xFFFFFFF0) - 32;
 596                 unsigned short x = 0;
 597                 for (; i < ((unsigned int)retaddr & 0xFFFFFFF0) + 32; i += 2) {
 598                         if (!(i & 0xF))
 599                                 printk("\n" KERN_EMERG "0x%08x: ", i);
 600
 601                         if (get_user(x, (unsigned short *)i))
 602                                 break;
 603 #ifndef CONFIG_DEBUG_HWERR
 604                         /* If one of the last few instructions was a STI
 605                          * it is likely that the error occured awhile ago
 606                          * and we just noticed
 607                          */
 608                         if (x >= 0x0040 && x <= 0x0047 && i <= 0)
 609                                 panic("\n\nWARNING : You should reconfigure"
 610                                         " the kernel to turn on\n"
 611                                         " 'Hardware error interrupt"
 612                                         " debugging'\n"
 613                                         " The rest of this error"
 614                                         " is meanless\n");
 615 #endif
 616                         if (i == (unsigned int)retaddr)
 617                                 printk("[%04x]", x);
 618                         else
 619                                 printk(" %04x ", x);
 620                 }
 621                 printk("\n" KERN_EMERG "\n");
 622         } else
 623                 printk(KERN_EMERG
 624                         "Cannot look at the [PC] for it is"
 625                         "in unreadable L1 SRAM - sorry\n");
 626
 627
 628         printk(KERN_EMERG
 629                 "RETE:  %08lx  RETN: %08lx  RETX: %08lx  RETS: %08lx\n",
 630                 fp->rete, fp->retn, fp->retx, fp->rets);
 631         printk(KERN_EMERG "IPEND: %04lx  SYSCFG: %04lx\n",
 632                 fp->ipend, fp->syscfg);
 633         printk(KERN_EMERG "SEQSTAT: %08lx    SP: %08lx\n",
 634                 (long)fp->seqstat, (long)fp);
 635         printk(KERN_EMERG "R0: %08lx    R1: %08lx    R2: %08lx    R3: %08lx\n",
 636                 fp->r0, fp->r1, fp->r2, fp->r3);
 637         printk(KERN_EMERG "R4: %08lx    R5: %08lx    R6: %08lx    R7: %08lx\n",
 638                 fp->r4, fp->r5, fp->r6, fp->r7);
 639         printk(KERN_EMERG "P0: %08lx    P1: %08lx    P2: %08lx    P3: %08lx\n",
 640                 fp->p0, fp->p1, fp->p2, fp->p3);
 641         printk(KERN_EMERG
 642                 "P4: %08lx    P5: %08lx    FP: %08lx\n",
 643                 fp->p4, fp->p5, fp->fp);
 644         printk(KERN_EMERG
 645                 "A0.w: %08lx    A0.x: %08lx    A1.w: %08lx    A1.x: %08lx\n",
 646                 fp->a0w, fp->a0x, fp->a1w, fp->a1x);
 647
 648         printk(KERN_EMERG "LB0: %08lx  LT0: %08lx  LC0: %08lx\n",
 649                 fp->lb0, fp->lt0, fp->lc0);
 650         printk(KERN_EMERG "LB1: %08lx  LT1: %08lx  LC1: %08lx\n",
 651                 fp->lb1, fp->lt1, fp->lc1);
 652         printk(KERN_EMERG "B0: %08lx  L0: %08lx  M0: %08lx  I0: %08lx\n",
 653                 fp->b0, fp->l0, fp->m0, fp->i0);
 654         printk(KERN_EMERG "B1: %08lx  L1: %08lx  M1: %08lx  I1: %08lx\n",
 655                 fp->b1, fp->l1, fp->m1, fp->i1);
 656         printk(KERN_EMERG "B2: %08lx  L2: %08lx  M2: %08lx  I2: %08lx\n",
 657                 fp->b2, fp->l2, fp->m2, fp->i2);
 658         printk(KERN_EMERG "B3: %08lx  L3: %08lx  M3: %08lx  I3: %08lx\n",
 659                 fp->b3, fp->l3, fp->m3, fp->i3);
 660
 661         printk(KERN_EMERG "\n" KERN_EMERG "USP: %08lx   ASTAT: %08lx\n",
 662                 rdusp(), fp->astat);
 663         if ((long)fp->seqstat & SEQSTAT_EXCAUSE) {
 664                 printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n",
 665                         (void *)bfin_read_DCPLB_FAULT_ADDR());
 666                 printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n",
 667                         (void *)bfin_read_ICPLB_FAULT_ADDR());
 668         }
 669
 670         printk("\n\n");
 671 }
 672
 673 #ifdef CONFIG_SYS_BFIN_SPINLOCK_L1
 674 asmlinkage int sys_bfin_spinlock(int *spinlock)__attribute__((l1_text));
 675 #endif
 676
 677 asmlinkage int sys_bfin_spinlock(int *spinlock)
 678 {
 679         int ret = 0;
 680         int tmp = 0;
 681
 682         local_irq_disable();
 683         ret = get_user(tmp, spinlock);
 684         if (ret == 0) {
 685                 if (tmp)
 686                         ret = 1;
 687                 tmp = 1;
 688                 put_user(tmp, spinlock);
 689         }
 690         local_irq_enable();
 691         return ret;
 692 }
 693
 694 int bfin_request_exception(unsigned int exception, void (*handler)(void))
 695 {
 696         void (*curr_handler)(void);
 697
 698         if (exception > 0x3F)
 699                 return -EINVAL;
 700
 701         curr_handler = ex_table[exception];
 702
 703         if (curr_handler != ex_replaceable)
 704                 return -EBUSY;
 705
 706         ex_table[exception] = handler;
 707
 708         return 0;
 709 }
 710 EXPORT_SYMBOL(bfin_request_exception);
 711
 712 int bfin_free_exception(unsigned int exception, void (*handler)(void))
 713 {
 714         void (*curr_handler)(void);
 715
 716         if (exception > 0x3F)
 717                 return -EINVAL;
 718
 719         curr_handler = ex_table[exception];
 720
 721         if (curr_handler != handler)
 722                 return -EBUSY;
 723
 724         ex_table[exception] = ex_replaceable;
 725
 726         return 0;
 727 }
 728 EXPORT_SYMBOL(bfin_free_exception);
 729
 730 void panic_cplb_error(int cplb_panic, struct pt_regs *fp)
 731 {
 732         switch (cplb_panic) {
 733         case CPLB_NO_UNLOCKED:
 734                 printk(KERN_EMERG "All CPLBs are locked\n");
 735                 break;
 736         case CPLB_PROT_VIOL:
 737                 return;
 738         case CPLB_NO_ADDR_MATCH:
 739                 return;
 740         case CPLB_UNKNOWN_ERR:
 741                 printk(KERN_EMERG "Unknown CPLB Exception\n");
 742                 break;
 743         }
 744
 745         printk(KERN_EMERG "DCPLB_FAULT_ADDR=%p\n", (void *)bfin_read_DCPLB_FAULT_ADDR());
 746         printk(KERN_EMERG "ICPLB_FAULT_ADDR=%p\n", (void *)bfin_read_ICPLB_FAULT_ADDR());
 747         dump_bfin_regs(fp, (void *)fp->retx);
 748         dump_stack();
 749         panic("Unrecoverable event\n");
 750 }