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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.  /** @defgroup interrupt Interrupt
  29.   * @ingroup kernel
  30.   * @{
  31.   * @}
  32.   */
  33.  
  34.  /** @addtogroup genericinterrupt generic
  35.  * @ingroup interrupt
  36.  * @{
  37.  */
  38. /**
  39.  * @file
  40.  * @brief   Interrupt redirector.
  41.  *
  42.  * This file provides means of registering interrupt handlers
  43.  * by kernel functions and calling the handlers when interrupts
  44.  * occur.
  45.  */
  46.  
  47. #include <interrupt.h>
  48. #include <debug.h>
  49. #include <console/kconsole.h>
  50. #include <console/console.h>
  51. #include <console/chardev.h>
  52. #include <console/cmd.h>
  53. #include <panic.h>
  54. #include <print.h>
  55. #include <symtab.h>
  56.  
  57. static struct {
  58.     const char *name;
  59.     iroutine f;
  60. } exc_table[IVT_ITEMS];
  61.  
  62. SPINLOCK_INITIALIZE(exctbl_lock);
  63.  
  64. /** Register exception handler
  65.  *
  66.  * @param n Exception number
  67.  * @param name Description
  68.  * @param f Exception handler
  69.  */
  70. iroutine exc_register(int n, const char *name, iroutine f)
  71. {
  72.     ASSERT(n < IVT_ITEMS);
  73.    
  74.     iroutine old;
  75.    
  76.     spinlock_lock(&exctbl_lock);
  77.  
  78.     old = exc_table[n].f;
  79.     exc_table[n].f = f;
  80.     exc_table[n].name = name;
  81.  
  82.     spinlock_unlock(&exctbl_lock); 
  83.  
  84.     return old;
  85. }
  86.  
  87. /** Dispatch exception according to exception table
  88.  *
  89.  * Called directly from the assembler code.
  90.  * CPU is interrupts_disable()'d.
  91.  */
  92. void exc_dispatch(int n, istate_t *istate)
  93. {
  94.     ASSERT(n < IVT_ITEMS);
  95.    
  96.     exc_table[n].f(n + IVT_FIRST, istate);
  97.     /* This is a safe place to exit exiting thread */
  98.     if (THREAD && THREAD->interrupted && istate_from_uspace(istate))
  99.         thread_exit();
  100. }
  101.  
  102. /** Default 'null' exception handler */
  103. static void exc_undef(int n, istate_t *istate)
  104. {
  105.     fault_if_from_uspace(istate, "Unhandled exception %d.", n);
  106.     panic("Unhandled exception %d.", n);
  107. }
  108.  
  109. /** kconsole cmd - print all exceptions */
  110. static int exc_print_cmd(cmd_arg_t *argv)
  111. {
  112.     int i;
  113.     char *symbol;
  114.  
  115.     spinlock_lock(&exctbl_lock);
  116.     printf("Exc Description Handler\n");
  117.     for (i=0; i < IVT_ITEMS; i++) {
  118.         symbol = get_symtab_entry((__native)exc_table[i].f);
  119.         if (!symbol)
  120.             symbol = "not found";
  121.         printf("%d %s %.*p(%s)\n", i + IVT_FIRST, exc_table[i].name,
  122.                sizeof(__address) * 2, exc_table[i].f,symbol);      
  123.         if (!((i+1) % 20)) {
  124.             printf("Press any key to continue.");
  125.             spinlock_unlock(&exctbl_lock);
  126.             getc(stdin);
  127.             spinlock_lock(&exctbl_lock);
  128.             printf("\n");
  129.         }
  130.     }
  131.     spinlock_unlock(&exctbl_lock);
  132.    
  133.     return 1;
  134. }
  135.  
  136. static cmd_info_t exc_info = {
  137.     .name = "exc",
  138.     .description = "Print exception table.",
  139.     .func = exc_print_cmd,
  140.     .help = NULL,
  141.     .argc = 0,
  142.     .argv = NULL
  143. };
  144.  
  145. /** Initialize generic exception handling support */
  146. void exc_init(void)
  147. {
  148.     int i;
  149.  
  150.     for (i=0;i < IVT_ITEMS; i++)
  151.         exc_register(i, "undef", (iroutine) exc_undef);
  152.  
  153.     cmd_initialize(&exc_info);
  154.     if (!cmd_register(&exc_info))
  155.         panic("could not register command %s\n", exc_info.name);
  156. }
  157.  
  158.  
  159.  /** @}
  160.  */
  161.  
  162.