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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. #ifdef CONFIG_KCONSOLE
  113.  
  114. /** kconsole cmd - print all exceptions */
  115. static int cmd_exc_print(cmd_arg_t *argv)
  116. {
  117. #if (IVT_ITEMS > 0)
  118.     unsigned int i;
  119.     char *symbol;
  120.  
  121.     spinlock_lock(&exctbl_lock);
  122.  
  123. #ifdef __32_BITS__
  124.     printf("Exc Description          Handler    Symbol\n");
  125.     printf("--- -------------------- ---------- --------\n");
  126. #endif
  127.  
  128. #ifdef __64_BITS__
  129.     printf("Exc Description          Handler            Symbol\n");
  130.     printf("--- -------------------- ------------------ --------\n");
  131. #endif
  132.    
  133.     for (i = 0; i < IVT_ITEMS; i++) {
  134.         symbol = get_symtab_entry((unative_t) exc_table[i].f);
  135.         if (!symbol)
  136.             symbol = "not found";
  137.  
  138. #ifdef __32_BITS__
  139.         printf("%-3u %-20s %10p %s\n", i + IVT_FIRST, exc_table[i].name,
  140.             exc_table[i].f, symbol);
  141. #endif
  142.  
  143. #ifdef __64_BITS__
  144.         printf("%-3u %-20s %18p %s\n", i + IVT_FIRST, exc_table[i].name,
  145.             exc_table[i].f, symbol);
  146. #endif
  147.        
  148.         if (((i + 1) % 20) == 0) {
  149.             printf(" -- Press any key to continue -- ");
  150.             spinlock_unlock(&exctbl_lock);
  151.             getc(stdin);
  152.             spinlock_lock(&exctbl_lock);
  153.             printf("\n");
  154.         }
  155.     }
  156.    
  157.     spinlock_unlock(&exctbl_lock);
  158. #endif
  159.    
  160.     return 1;
  161. }
  162.  
  163.  
  164. static cmd_info_t exc_info = {
  165.     .name = "exc",
  166.     .description = "Print exception table.",
  167.     .func = cmd_exc_print,
  168.     .help = NULL,
  169.     .argc = 0,
  170.     .argv = NULL
  171. };
  172.  
  173. #endif
  174.  
  175. /** Initialize generic exception handling support */
  176. void exc_init(void)
  177. {
  178.     int i;
  179.  
  180.     for (i = 0; i < IVT_ITEMS; i++)
  181.         exc_register(i, "undef", (iroutine) exc_undef);
  182.  
  183. #ifdef CONFIG_KCONSOLE
  184.     cmd_initialize(&exc_info);
  185.     if (!cmd_register(&exc_info))
  186.         printf("Cannot register command %s\n", exc_info.name);
  187. #endif
  188. }
  189.  
  190. /** @}
  191.  */
  192.