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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.  
  49. #ifdef CONFIG_SYMTAB
  50. #include <symtab.h>
  51. #endif
  52.  
  53. static struct {
  54.     const char *name;
  55.     iroutine f;
  56. } exc_table[IVT_ITEMS];
  57.  
  58. SPINLOCK_INITIALIZE(exctbl_lock);
  59.  
  60. /** Register exception handler
  61.  *
  62.  * @param n Exception number
  63.  * @param name Description
  64.  * @param f Exception handler
  65.  */
  66. iroutine exc_register(int n, const char *name, iroutine f)
  67. {
  68.     ASSERT(n < IVT_ITEMS);
  69.    
  70.     iroutine old;
  71.    
  72.     spinlock_lock(&exctbl_lock);
  73.    
  74.     old = exc_table[n].f;
  75.     exc_table[n].f = f;
  76.     exc_table[n].name = name;
  77.    
  78.     spinlock_unlock(&exctbl_lock);
  79.    
  80.     return old;
  81. }
  82.  
  83. /** Dispatch exception according to exception table
  84.  *
  85.  * Called directly from the assembler code.
  86.  * CPU is interrupts_disable()'d.
  87.  */
  88. void exc_dispatch(int n, istate_t *istate)
  89. {
  90.     ASSERT(n < IVT_ITEMS);
  91.  
  92. #ifdef CONFIG_UDEBUG
  93.     if (THREAD) THREAD->udebug.uspace_state = istate;
  94. #endif
  95.    
  96.     exc_table[n].f(n + IVT_FIRST, istate);
  97.  
  98. #ifdef CONFIG_UDEBUG
  99.     if (THREAD) THREAD->udebug.uspace_state = NULL;
  100. #endif
  101.  
  102.     /* This is a safe place to exit exiting thread */
  103.     if (THREAD && THREAD->interrupted && istate_from_uspace(istate))
  104.         thread_exit();
  105. }
  106.  
  107. /** Default 'null' exception handler */
  108. static void exc_undef(int n, istate_t *istate)
  109. {
  110.     fault_if_from_uspace(istate, "Unhandled exception %d.", n);
  111.     panic("Unhandled exception %d.", n);
  112. }
  113.  
  114. #ifdef CONFIG_KCONSOLE
  115.  
  116. /** kconsole cmd - print all exceptions */
  117. static int cmd_exc_print(cmd_arg_t *argv)
  118. {
  119. #if (IVT_ITEMS > 0)
  120.     unsigned int i;
  121.     char *symbol;
  122.  
  123.     spinlock_lock(&exctbl_lock);
  124.  
  125. #ifdef __32_BITS__
  126.     printf("Exc Description          Handler    Symbol\n");
  127.     printf("--- -------------------- ---------- --------\n");
  128. #endif
  129.  
  130. #ifdef __64_BITS__
  131.     printf("Exc Description          Handler            Symbol\n");
  132.     printf("--- -------------------- ------------------ --------\n");
  133. #endif
  134.    
  135.     for (i = 0; i < IVT_ITEMS; i++) {
  136. #ifdef CONFIG_SYMTAB
  137.         symbol = get_symtab_entry((unative_t) exc_table[i].f);
  138.         if (!symbol)
  139.             symbol = "not found";
  140. #else
  141.         symbol = "n/a";
  142. #endif
  143.  
  144. #ifdef __32_BITS__
  145.         printf("%-3u %-20s %10p %s\n", i + IVT_FIRST, exc_table[i].name,
  146.             exc_table[i].f, symbol);
  147. #endif
  148.  
  149. #ifdef __64_BITS__
  150.         printf("%-3u %-20s %18p %s\n", i + IVT_FIRST, exc_table[i].name,
  151.             exc_table[i].f, symbol);
  152. #endif
  153.        
  154.         if (((i + 1) % 20) == 0) {
  155.             printf(" -- Press any key to continue -- ");
  156.             spinlock_unlock(&exctbl_lock);
  157.             _getc(stdin);
  158.             spinlock_lock(&exctbl_lock);
  159.             printf("\n");
  160.         }
  161.     }
  162.    
  163.     spinlock_unlock(&exctbl_lock);
  164. #endif
  165.    
  166.     return 1;
  167. }
  168.  
  169.  
  170. static cmd_info_t exc_info = {
  171.     .name = "exc",
  172.     .description = "Print exception table.",
  173.     .func = cmd_exc_print,
  174.     .help = NULL,
  175.     .argc = 0,
  176.     .argv = NULL
  177. };
  178.  
  179. #endif
  180.  
  181. /** Initialize generic exception handling support */
  182. void exc_init(void)
  183. {
  184.     int i;
  185.  
  186.     for (i = 0; i < IVT_ITEMS; i++)
  187.         exc_register(i, "undef", (iroutine) exc_undef);
  188.  
  189. #ifdef CONFIG_KCONSOLE
  190.     cmd_initialize(&exc_info);
  191.     if (!cmd_register(&exc_info))
  192.         printf("Cannot register command %s\n", exc_info.name);
  193. #endif
  194. }
  195.  
  196. /** @}
  197.  */
  198.