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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. /** @addtogroup genericinterrupt
  30.  * @{
  31.  */
  32. /**
  33.  * @file
  34.  * @brief   Interrupt redirector.
  35.  *
  36.  * This file provides means of registering interrupt handlers
  37.  * by kernel functions and calling the handlers when interrupts
  38.  * occur.
  39.  */
  40.  
  41. #include <interrupt.h>
  42. #include <debug.h>
  43. #include <console/kconsole.h>
  44. #include <console/console.h>
  45. #include <console/chardev.h>
  46. #include <console/cmd.h>
  47. #include <panic.h>
  48. #include <print.h>
  49. #include <symtab.h>
  50.  
  51. static struct {
  52.     const char *name;
  53.     iroutine f;
  54. } exc_table[IVT_ITEMS];
  55.  
  56. SPINLOCK_INITIALIZE(exctbl_lock);
  57.  
  58. /** Register exception handler
  59.  *
  60.  * @param n Exception number
  61.  * @param name Description
  62.  * @param f Exception handler
  63.  */
  64. iroutine exc_register(int n, const char *name, iroutine f)
  65. {
  66.     ASSERT(n < IVT_ITEMS);
  67.    
  68.     iroutine old;
  69.    
  70.     spinlock_lock(&exctbl_lock);
  71.  
  72.     old = exc_table[n].f;
  73.     exc_table[n].f = f;
  74.     exc_table[n].name = name;
  75.  
  76.     spinlock_unlock(&exctbl_lock); 
  77.  
  78.     return old;
  79. }
  80.  
  81. /** Dispatch exception according to exception table
  82.  *
  83.  * Called directly from the assembler code.
  84.  * CPU is interrupts_disable()'d.
  85.  */
  86. void exc_dispatch(int n, istate_t *istate)
  87. {
  88.     ASSERT(n < IVT_ITEMS);
  89.    
  90.     exc_table[n].f(n + IVT_FIRST, istate);
  91.     /* This is a safe place to exit exiting thread */
  92.     if (THREAD && THREAD->interrupted && istate_from_uspace(istate))
  93.         thread_exit();
  94. }
  95.  
  96. /** Default 'null' exception handler */
  97. static void exc_undef(int n, istate_t *istate)
  98. {
  99.     fault_if_from_uspace(istate, "Unhandled exception %d.", n);
  100.     panic("Unhandled exception %d.", n);
  101. }
  102.  
  103. /** kconsole cmd - print all exceptions */
  104. static int exc_print_cmd(cmd_arg_t *argv)
  105. {
  106.     unsigned int i;
  107.     char *symbol;
  108.  
  109.     spinlock_lock(&exctbl_lock);
  110.    
  111.     if (sizeof(void *) == 4) {
  112.         printf("Exc Description    Handler    Symbol\n");
  113.         printf("--- -------------- ---------- --------\n");
  114.     } else {
  115.         printf("Exc Description    Handler            Symbol\n");
  116.         printf("--- -------------- ------------------ --------\n");
  117.     }
  118.    
  119.     for (i = 0; i < IVT_ITEMS; i++) {
  120.         symbol = get_symtab_entry((unative_t) exc_table[i].f);
  121.         if (!symbol)
  122.             symbol = "not found";
  123.        
  124.         if (sizeof(void *) == 4)
  125.             printf("%-3u %-14s %#10zx %s\n", i + IVT_FIRST, exc_table[i].name,
  126.                 exc_table[i].f, symbol);
  127.         else
  128.             printf("%-3u %-14s %#18zx %s\n", i + IVT_FIRST, exc_table[i].name,
  129.                 exc_table[i].f, symbol);
  130.        
  131.         if (((i + 1) % 20) == 0) {
  132.             printf(" -- Press any key to continue -- ");
  133.             spinlock_unlock(&exctbl_lock);
  134.             getc(stdin);
  135.             spinlock_lock(&exctbl_lock);
  136.             printf("\n");
  137.         }
  138.     }
  139.    
  140.     spinlock_unlock(&exctbl_lock);
  141.    
  142.     return 1;
  143. }
  144.  
  145. static cmd_info_t exc_info = {
  146.     .name = "exc",
  147.     .description = "Print exception table.",
  148.     .func = exc_print_cmd,
  149.     .help = NULL,
  150.     .argc = 0,
  151.     .argv = NULL
  152. };
  153.  
  154. /** Initialize generic exception handling support */
  155. void exc_init(void)
  156. {
  157.     int i;
  158.  
  159.     for (i=0;i < IVT_ITEMS; i++)
  160.         exc_register(i, "undef", (iroutine) exc_undef);
  161.  
  162.     cmd_initialize(&exc_info);
  163.     if (!cmd_register(&exc_info))
  164.         panic("could not register command %s\n", exc_info.name);
  165. }
  166.  
  167. /** @}
  168.  */
  169.