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