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  1. /*
  2.  * Copyright (c) 2008 Jiri Svoboda
  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 debug
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <stdlib.h>
  36. #include <libadt/list.h>
  37. #include <assert.h>
  38. #include <futex.h>
  39. #include <async.h>
  40. #include <errno.h>
  41.  
  42. #include "include/arch.h"
  43. #include "main.h"
  44. #include "breakpoint.h"
  45.  
  46. static int last_bkpt_id = 0;
  47.  
  48. /** List of breakpoints that are set on the application */
  49. link_t bkpts;
  50.  
  51. /** Pointer to currently active breakpoint or NULL if none */
  52. breakpoint_t *active_bkpt = NULL;
  53.  
  54. void breakpoint_init(void)
  55. {
  56.     list_initialize(&bkpts);
  57. }
  58.  
  59. int breakpoint_add(uintptr_t addr)
  60. {
  61.     breakpoint_t *old_b, *b;
  62.     int rc;
  63.  
  64.     old_b = breakpoint_find_by_addr(addr);
  65.     if (old_b != NULL) {
  66.         printf("Breakpoint already exists at address 0x%lx. ID:%d\n",
  67.             old_b->addr, old_b->id);
  68.         return EEXISTS;
  69.     }
  70.  
  71.     b = malloc(sizeof(breakpoint_t));
  72.     if (!b) {
  73.         printf("malloc failed\n");
  74.         return ENOMEM;
  75.     }
  76.  
  77.     b->addr = addr;
  78.     rc = arch_breakpoint_set(b);
  79.     if (rc < 0) {
  80.         printf("Failed to add breakpoint at 0x%x\n", addr);
  81.         return rc;
  82.     }
  83.  
  84.     b->id = ++last_bkpt_id;
  85.  
  86.     list_append(&b->link, &bkpts);
  87.  
  88.     printf("Added breakpoint %d at address 0x%lx\n", b->id, b->addr);
  89.  
  90.     return 0;
  91. }
  92.  
  93. /** Get breakpoint struct by breakpoint id.
  94.  *
  95.  * @param bid Breakpoint id.
  96.  *
  97.  * @return Pointer to breakpoint struct or NULL if not found.
  98.  */
  99. breakpoint_t *breakpoint_find_by_id(int bid)
  100. {
  101.     link_t *cur;
  102.     breakpoint_t *b;
  103.  
  104.     for (cur = bkpts.next; cur != &bkpts; cur = cur->next) {
  105.         b = list_get_instance(cur, breakpoint_t, link);
  106.         if (b->id == bid) return b;
  107.     }
  108.  
  109.     return NULL;
  110. }
  111.  
  112. /** Get breakpoint struct by breakpoint id.
  113.  *
  114.  * @param bid Breakpoint id.
  115.  *
  116.  * @return Pointer to breakpoint struct or NULL if not found.
  117.  */
  118. breakpoint_t *breakpoint_find_by_addr(uintptr_t addr)
  119. {
  120.     link_t *cur;
  121.     breakpoint_t *b;
  122.  
  123.     for (cur = bkpts.next; cur != &bkpts; cur = cur->next) {
  124.         b = list_get_instance(cur, breakpoint_t, link);
  125.         if (b->addr == addr) return b;
  126.     }
  127.  
  128.     return NULL;
  129. }
  130.  
  131. void breakpoint_remove(int bid)
  132. {
  133.     breakpoint_t *b;
  134.     int rc;
  135.  
  136.     b = breakpoint_find_by_id(bid);
  137.     if (!b) {
  138.         printf("No such breakpoint\n");
  139.         return;
  140.     }
  141.  
  142.     rc = arch_breakpoint_remove(b);
  143.     if (rc < 0) {
  144.         printf("Failed to remove breakpoint %d\n", b->id);
  145.         return;
  146.     }
  147.  
  148.     list_remove(&b->link);
  149.     free(b);
  150. }
  151.  
  152. void breakpoint_list(void)
  153. {
  154.     breakpoint_t *b;
  155.     link_t *cur;
  156.     int count;
  157.  
  158.     count = 0;
  159.     for (cur = bkpts.next; cur != &bkpts; cur = cur->next) {
  160.         b = list_get_instance(cur, breakpoint_t, link);
  161.         printf("%d at 0x%lx\n", b->id, b->addr);
  162.         ++count;
  163.     }
  164.     if (!count) printf("No breakpoints set\n");
  165. }
  166.  
  167. /** @}
  168.  */
  169.