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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/cmd.h>
  46. #include <panic.h>
  47. #include <print.h>
  48. #include <symtab.h>
  49.  
  50. static struct {
  51.     const char *name;
  52.     iroutine f;
  53. } exc_table[IVT_ITEMS];
  54.  
  55. SPINLOCK_INITIALIZE(exctbl_lock);
  56.  
  57. /** Register exception handler
  58.  *
  59.  * @param n Exception number
  60.  * @param name Description
  61.  * @param f Exception handler
  62.  */
  63. iroutine exc_register(int n, const char *name, iroutine f)
  64. {
  65.     ASSERT(n < IVT_ITEMS);
  66.    
  67.     iroutine old;
  68.    
  69.     spinlock_lock(&exctbl_lock);
  70.    
  71.     old = exc_table[n].f;
  72.     exc_table[n].f = f;
  73.     exc_table[n].name = name;
  74.    
  75.     spinlock_unlock(&exctbl_lock);
  76.    
  77.     return old;
  78. }
  79.  
  80. /** Dispatch exception according to exception table
  81.  *
  82.  * Called directly from the assembler code.
  83.  * CPU is interrupts_disable()'d.
  84.  */
  85. void exc_dispatch(int n, istate_t *istate)
  86. {
  87.     ASSERT(n < IVT_ITEMS);
  88.  
  89. #ifdef CONFIG_UDEBUG
  90.     if (THREAD) THREAD->udebug.uspace_state = istate;
  91. #endif
  92.    
  93.     exc_table[n].f(n + IVT_FIRST, istate);
  94.  
  95. #ifdef CONFIG_UDEBUG
  96.     if (THREAD) THREAD->udebug.uspace_state = NULL;
  97. #endif
  98.  
  99.     /* This is a safe place to exit exiting thread */
  100.     if (THREAD && THREAD->interrupted && istate_from_uspace(istate))
  101.         thread_exit();
  102. }
  103.  
  104. /** Default 'null' exception handler */
  105. static void exc_undef(int n, istate_t *istate)
  106. {
  107.     fault_if_from_uspace(istate, "Unhandled exception %d.", n);
  108.     panic("Unhandled exception %d.", n);
  109. }
  110.  
  111. #ifdef CONFIG_KCONSOLE
  112.  
  113. /** kconsole cmd - print all exceptions */
  114. static int cmd_exc_print(cmd_arg_t *argv)
  115. {
  116. #if (IVT_ITEMS > 0)
  117.     unsigned int i;
  118.     char *symbol;
  119.  
  120.     spinlock_lock(&exctbl_lock);
  121.  
  122. #ifdef __32_BITS__
  123.     printf("Exc Description          Handler    Symbol\n");
  124.     printf("--- -------------------- ---------- --------\n");
  125. #endif
  126.  
  127. #ifdef __64_BITS__
  128.     printf("Exc Description          Handler            Symbol\n");
  129.     printf("--- -------------------- ------------------ --------\n");
  130. #endif
  131.    
  132.     for (i = 0; i < IVT_ITEMS; i++) {
  133.         symbol = symtab_fmt_name_lookup((unative_t) exc_table[i].f);
  134.  
  135. #ifdef __32_BITS__
  136.         printf("%-3u %-20s %10p %s\n", i + IVT_FIRST, exc_table[i].name,
  137.             exc_table[i].f, symbol);
  138. #endif
  139.  
  140. #ifdef __64_BITS__
  141.         printf("%-3u %-20s %18p %s\n", i + IVT_FIRST, exc_table[i].name,
  142.             exc_table[i].f, symbol);
  143. #endif
  144.        
  145.         if (((i + 1) % 20) == 0) {
  146.             printf(" -- Press any key to continue -- ");
  147.             spinlock_unlock(&exctbl_lock);
  148.             _getc(stdin);
  149.             spinlock_lock(&exctbl_lock);
  150.             printf("\n");
  151.         }
  152.     }
  153.    
  154.     spinlock_unlock(&exctbl_lock);
  155. #endif
  156.    
  157.     return 1;
  158. }
  159.  
  160.  
  161. static cmd_info_t exc_info = {
  162.     .name = "exc",
  163.     .description = "Print exception table.",
  164.     .func = cmd_exc_print,
  165.     .help = NULL,
  166.     .argc = 0,
  167.     .argv = NULL
  168. };
  169.  
  170. #endif
  171.  
  172. /** Initialize generic exception handling support */
  173. void exc_init(void)
  174. {
  175.     int i;
  176.  
  177.     for (i = 0; i < IVT_ITEMS; i++)
  178.         exc_register(i, "undef", (iroutine) exc_undef);
  179.  
  180. #ifdef CONFIG_KCONSOLE
  181.     cmd_initialize(&exc_info);
  182.     if (!cmd_register(&exc_info))
  183.         printf("Cannot register command %s\n", exc_info.name);
  184. #endif
  185. }
  186.  
  187. /** @}
  188.  */
  189.