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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. #include <tdebug/tdebug.h>
  51.  
  52. static struct {
  53.     const char *name;
  54.     iroutine f;
  55. } exc_table[IVT_ITEMS];
  56.  
  57. SPINLOCK_INITIALIZE(exctbl_lock);
  58.  
  59. /** Register exception handler
  60.  *
  61.  * @param n Exception number
  62.  * @param name Description
  63.  * @param f Exception handler
  64.  */
  65. iroutine exc_register(int n, const char *name, iroutine f)
  66. {
  67.     ASSERT(n < IVT_ITEMS);
  68.    
  69.     iroutine old;
  70.    
  71.     spinlock_lock(&exctbl_lock);
  72.  
  73.     old = exc_table[n].f;
  74.     exc_table[n].f = f;
  75.     exc_table[n].name = name;
  76.  
  77.     spinlock_unlock(&exctbl_lock); 
  78.  
  79.     return old;
  80. }
  81.  
  82. /** Dispatch exception according to exception table
  83.  *
  84.  * Called directly from the assembler code.
  85.  * CPU is interrupts_disable()'d.
  86.  */
  87. void exc_dispatch(int n, istate_t *istate)
  88. {
  89.     ASSERT(n < IVT_ITEMS);
  90.  
  91.     if (THREAD && istate_from_uspace(istate)) {
  92.         /* Record userspace state */
  93.         THREAD->tdebug.uspace_state = istate;
  94.     }
  95.  
  96.     exc_table[n].f(n + IVT_FIRST, istate);
  97.  
  98.     if (THREAD && istate_from_uspace(istate)) {
  99.         /* Clear it again (mostly for dev. and debugging purposes) */
  100.         THREAD->tdebug.uspace_state = NULL;
  101.     }
  102.  
  103.     /* This is a safe place to exit exiting thread */
  104.     if (THREAD && THREAD->interrupted && istate_from_uspace(istate))
  105.         thread_exit();
  106. }
  107.  
  108. /** Default 'null' exception handler */
  109. static void exc_undef(int n, istate_t *istate)
  110. {
  111.     fault_if_from_uspace(istate, "Unhandled exception %d.", n);
  112.     panic("Unhandled exception %d.", n);
  113. }
  114.  
  115. /** kconsole cmd - print all exceptions */
  116. static int exc_print_cmd(cmd_arg_t *argv)
  117. {
  118. #if (IVT_ITEMS > 0)
  119.     unsigned int i;
  120.     char *symbol;
  121.  
  122.     spinlock_lock(&exctbl_lock);
  123.    
  124.     if (sizeof(void *) == 4) {
  125.         printf("Exc Description          Handler    Symbol\n");
  126.         printf("--- -------------------- ---------- --------\n");
  127.     } else {
  128.         printf("Exc Description          Handler            Symbol\n");
  129.         printf("--- -------------------- ------------------ --------\n");
  130.     }
  131.    
  132.     for (i = 0; i < IVT_ITEMS; i++) {
  133.         symbol = get_symtab_entry((unative_t) exc_table[i].f);
  134.         if (!symbol)
  135.             symbol = "not found";
  136.        
  137.         if (sizeof(void *) == 4)
  138.             printf("%-3u %-20s %#10zx %s\n", i + IVT_FIRST, exc_table[i].name,
  139.                 exc_table[i].f, symbol);
  140.         else
  141.             printf("%-3u %-20s %#18zx %s\n", i + IVT_FIRST, exc_table[i].name,
  142.                 exc_table[i].f, symbol);
  143.        
  144.         if (((i + 1) % 20) == 0) {
  145.             printf(" -- Press any key to continue -- ");
  146.             spinlock_unlock(&exctbl_lock);
  147.             getc(stdin);
  148.             spinlock_lock(&exctbl_lock);
  149.             printf("\n");
  150.         }
  151.     }
  152.    
  153.     spinlock_unlock(&exctbl_lock);
  154. #endif
  155.    
  156.     return 1;
  157. }
  158.  
  159. static cmd_info_t exc_info = {
  160.     .name = "exc",
  161.     .description = "Print exception table.",
  162.     .func = exc_print_cmd,
  163.     .help = NULL,
  164.     .argc = 0,
  165.     .argv = NULL
  166. };
  167.  
  168. /** Initialize generic exception handling support */
  169. void exc_init(void)
  170. {
  171.     int i;
  172.  
  173.     for (i=0;i < IVT_ITEMS; i++)
  174.         exc_register(i, "undef", (iroutine) exc_undef);
  175.  
  176.     cmd_initialize(&exc_info);
  177.     if (!cmd_register(&exc_info))
  178.         panic("could not register command %s\n", exc_info.name);
  179. }
  180.  
  181. /** @}
  182.  */
  183.