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  1. /*
  2.  * Copyright (C) 2005 Ondrej Palkovsky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include <interrupt.h>
  30. #include <debug.h>
  31. #include <console/kconsole.h>
  32. #include <console/console.h>
  33. #include <console/chardev.h>
  34. #include <panic.h>
  35. #include <print.h>
  36. #include <symtab.h>
  37.  
  38. static struct {
  39.     const char *name;
  40.     iroutine f;
  41. } exc_table[IVT_ITEMS];
  42.  
  43. static spinlock_t exctbl_lock;
  44.  
  45. /** Register exception handler
  46.  *
  47.  * @param n Exception number
  48.  * @param name Description
  49.  * @param f Exception handler
  50.  */
  51. iroutine exc_register(int n, const char *name, iroutine f)
  52. {
  53.     ASSERT(n < IVT_ITEMS);
  54.    
  55.     iroutine old;
  56.    
  57.     spinlock_lock(&exctbl_lock);
  58.  
  59.     old = exc_table[n].f;
  60.     exc_table[n].f = f;
  61.     exc_table[n].name = name;
  62.  
  63.     spinlock_unlock(&exctbl_lock); 
  64.  
  65.     return old;
  66. }
  67.  
  68. /** Dispatch exception according to exception table
  69.  *
  70.  * Called directly from the assembler code.
  71.  * CPU is interrupts_disable()'d.
  72.  */
  73. void exc_dispatch(int n, void *stack)
  74. {
  75.     ASSERT(n < IVT_ITEMS);
  76.    
  77.     exc_table[n].f(n, stack);
  78. }
  79.  
  80. /** Default 'null' exception handler */
  81. static void exc_undef(int n, void *stack)
  82. {
  83.     panic("Unhandled exception %d.", n);
  84. }
  85.  
  86. /** KConsole cmd - print all exceptions */
  87. static int exc_print_cmd(cmd_arg_t *argv)
  88. {
  89.     int i;
  90.     char *symbol;
  91.  
  92.     spinlock_lock(&exctbl_lock);
  93.     printf("Exc Handler    Description\n");
  94.     for (i=0; i < IVT_ITEMS; i++) {
  95.         symbol = get_symtab_entry((__native)exc_table[i].f);
  96.         if (!symbol)
  97.             symbol = "not found";
  98.         printf("%d %s 0x%p(%s)\n",i,exc_table[i].name,
  99.                exc_table[i].f,symbol);     
  100.         if (!((i+1) % 20)) {
  101.             printf("Press any key to continue.");
  102.             spinlock_unlock(&exctbl_lock);
  103.             getc(stdin);
  104.             spinlock_lock(&exctbl_lock);
  105.             printf("\n");
  106.         }
  107.     }
  108.     spinlock_unlock(&exctbl_lock);
  109.    
  110.     return 1;
  111. }
  112.  
  113. static cmd_info_t exc_info = {
  114.     .name = "pexc",
  115.     .description = "Print exception table",
  116.     .func = exc_print_cmd,
  117.     .help = NULL,
  118.     .argc = 0,
  119.     .argv = NULL
  120. };
  121.  
  122. /** Initialize generic exception handling support */
  123. void exc_init(void)
  124. {
  125.     int i;
  126.  
  127.     spinlock_initialize(&exctbl_lock, "exctbl_lock");
  128.  
  129.     for (i=0;i < IVT_ITEMS; i++)
  130.         exc_register(i, "undef", exc_undef);
  131.  
  132.     spinlock_initialize(&exc_info.lock, "kconsole_excinfo");
  133.     link_initialize(&exc_info.link);
  134.     if (!cmd_register(&exc_info))
  135.         panic("could not register command %s\n", exc_info.name);
  136. }
  137.  
  138.