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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. #ifdef CONFIG_UDEBUG
  91.     if (THREAD) THREAD->udebug.uspace_state = istate;
  92. #endif
  93.    
  94.     exc_table[n].f(n + IVT_FIRST, istate);
  95.  
  96. #ifdef CONFIG_UDEBUG
  97.     if (THREAD) THREAD->udebug.uspace_state = NULL;
  98. #endif
  99.  
  100.     /* This is a safe place to exit exiting thread */
  101.     if (THREAD && THREAD->interrupted && istate_from_uspace(istate))
  102.         thread_exit();
  103. }
  104.  
  105. /** Default 'null' exception handler */
  106. static void exc_undef(int n, istate_t *istate)
  107. {
  108.     fault_if_from_uspace(istate, "Unhandled exception %d.", n);
  109.     panic("Unhandled exception %d.", n);
  110. }
  111.  
  112. /** kconsole cmd - print all exceptions */
  113. static int exc_print_cmd(cmd_arg_t *argv)
  114. {
  115. #if (IVT_ITEMS > 0)
  116.     unsigned int i;
  117.     char *symbol;
  118.  
  119.     spinlock_lock(&exctbl_lock);
  120.  
  121. #ifdef __32_BITS__
  122.     printf("Exc Description          Handler    Symbol\n");
  123.     printf("--- -------------------- ---------- --------\n");
  124. #endif
  125.  
  126. #ifdef __64_BITS__
  127.     printf("Exc Description          Handler            Symbol\n");
  128.     printf("--- -------------------- ------------------ --------\n");
  129. #endif
  130.    
  131.     for (i = 0; i < IVT_ITEMS; i++) {
  132.         symbol = get_symtab_entry((unative_t) exc_table[i].f);
  133.         if (!symbol)
  134.             symbol = "not found";
  135.  
  136. #ifdef __32_BITS__
  137.         printf("%-3u %-20s %10p %s\n", i + IVT_FIRST, exc_table[i].name,
  138.             exc_table[i].f, symbol);
  139. #endif
  140.  
  141. #ifdef __64_BITS__
  142.         printf("%-3u %-20s %18p %s\n", i + IVT_FIRST, exc_table[i].name,
  143.             exc_table[i].f, symbol);
  144. #endif
  145.        
  146.         if (((i + 1) % 20) == 0) {
  147.             printf(" -- Press any key to continue -- ");
  148.             spinlock_unlock(&exctbl_lock);
  149.             getc(stdin);
  150.             spinlock_lock(&exctbl_lock);
  151.             printf("\n");
  152.         }
  153.     }
  154.    
  155.     spinlock_unlock(&exctbl_lock);
  156. #endif
  157.    
  158.     return 1;
  159. }
  160.  
  161. static cmd_info_t exc_info = {
  162.     .name = "exc",
  163.     .description = "Print exception table.",
  164.     .func = exc_print_cmd,
  165.     .help = NULL,
  166.     .argc = 0,
  167.     .argv = NULL
  168. };
  169.  
  170. /** Initialize generic exception handling support */
  171. void exc_init(void)
  172. {
  173.     int i;
  174.  
  175.     for (i = 0; i < IVT_ITEMS; i++)
  176.         exc_register(i, "undef", (iroutine) exc_undef);
  177.  
  178.     cmd_initialize(&exc_info);
  179.     if (!cmd_register(&exc_info))
  180.         panic("could not register command %s\n", exc_info.name);
  181. }
  182.  
  183. /** @}
  184.  */
  185.