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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 <console/cmd.h>
  35. #include <panic.h>
  36. #include <print.h>
  37. #include <symtab.h>
  38.  
  39. static struct {
  40.     const char *name;
  41.     iroutine f;
  42. } exc_table[IVT_ITEMS];
  43.  
  44. SPINLOCK_INITIALIZE(exctbl_lock);
  45.  
  46. /** Register exception handler
  47.  *
  48.  * @param n Exception number
  49.  * @param name Description
  50.  * @param f Exception handler
  51.  */
  52. iroutine exc_register(int n, const char *name, iroutine f)
  53. {
  54.     ASSERT(n < IVT_ITEMS);
  55.    
  56.     iroutine old;
  57.    
  58.     spinlock_lock(&exctbl_lock);
  59.  
  60.     old = exc_table[n].f;
  61.     exc_table[n].f = f;
  62.     exc_table[n].name = name;
  63.  
  64.     spinlock_unlock(&exctbl_lock); 
  65.  
  66.     return old;
  67. }
  68.  
  69. /** Dispatch exception according to exception table
  70.  *
  71.  * Called directly from the assembler code.
  72.  * CPU is interrupts_disable()'d.
  73.  */
  74. void exc_dispatch(int n, istate_t *istate)
  75. {
  76.     ASSERT(n < IVT_ITEMS);
  77.    
  78.     exc_table[n].f(n + IVT_FIRST, istate);
  79. }
  80.  
  81. /** Default 'null' exception handler */
  82. static void exc_undef(int n, istate_t *istate)
  83. {
  84.     panic("Unhandled exception %d.", n);
  85. }
  86.  
  87. /** kconsole cmd - print all exceptions */
  88. static int exc_print_cmd(cmd_arg_t *argv)
  89. {
  90.     int i;
  91.     char *symbol;
  92.  
  93.     spinlock_lock(&exctbl_lock);
  94.     printf("Exc Description Handler\n");
  95.     for (i=0; i < IVT_ITEMS; i++) {
  96.         symbol = get_symtab_entry((__native)exc_table[i].f);
  97.         if (!symbol)
  98.             symbol = "not found";
  99.         printf("%d %s %p(%s)\n", i + IVT_FIRST, exc_table[i].name,
  100.                exc_table[i].f,symbol);     
  101.         if (!((i+1) % 20)) {
  102.             printf("Press any key to continue.");
  103.             spinlock_unlock(&exctbl_lock);
  104.             getc(stdin);
  105.             spinlock_lock(&exctbl_lock);
  106.             printf("\n");
  107.         }
  108.     }
  109.     spinlock_unlock(&exctbl_lock);
  110.    
  111.     return 1;
  112. }
  113.  
  114. static cmd_info_t exc_info = {
  115.     .name = "exc",
  116.     .description = "Print exception table.",
  117.     .func = exc_print_cmd,
  118.     .help = NULL,
  119.     .argc = 0,
  120.     .argv = NULL
  121. };
  122.  
  123. /** Initialize generic exception handling support */
  124. void exc_init(void)
  125. {
  126.     int i;
  127.  
  128.     for (i=0;i < IVT_ITEMS; i++)
  129.         exc_register(i, "undef", (iroutine) exc_undef);
  130.  
  131.     cmd_initialize(&exc_info);
  132.     if (!cmd_register(&exc_info))
  133.         panic("could not register command %s\n", exc_info.name);
  134. }
  135.  
  136.