src/target/breakpoints.c

   1 /***************************************************************************
   2  *   Copyright (C) 2005 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <stdlib.h>
  25
  26 #include "binarybuffer.h"
  27 #include "target.h"
  28 #include "log.h"
  29 #include "types.h"
  30
  31 #include "breakpoints.h"
  32
  33 char *breakpoint_type_strings[] =
  34 {
  35         "hardware",
  36         "software"
  37 };
  38
  39 char *watchpoint_rw_strings[] =
  40 {
  41         "read",
  42         "write",
  43         "access"
  44 };
  45
  46 int breakpoint_add(target_t *target, u32 address, u32 length, enum breakpoint_type type)
  47 {
  48         breakpoint_t *breakpoint = target->breakpoints;
  49         breakpoint_t **breakpoint_p = &target->breakpoints;
  50         int retval;
  51
  52         while (breakpoint)
  53         {
  54                 if (breakpoint->address == address)
  55                         return ERROR_OK;
  56                 breakpoint_p = &breakpoint->next;
  57                 breakpoint = breakpoint->next;
  58         }
  59
  60         if ((retval = target->type->add_breakpoint(target, address, length, type)) != ERROR_OK)
  61         {
  62                 switch (retval)
  63                 {
  64                         case ERROR_TARGET_RESOURCE_NOT_AVAILABLE:
  65                                 INFO("can't add %s breakpoint, resource not available", breakpoint_type_strings[type]);
  66                                 return retval;
  67                                 break;
  68                         case ERROR_TARGET_NOT_HALTED:
  69                                 INFO("can't add breakpoint while target is running");
  70                                 return retval;
  71                                 break;
  72                         default:
  73                                 ERROR("unknown error");
  74                                 exit(-1);
  75                                 break;
  76                 }
  77         }
  78
  79         (*breakpoint_p) = malloc(sizeof(breakpoint_t));
  80         (*breakpoint_p)->address = address;
  81         (*breakpoint_p)->length = length;
  82         (*breakpoint_p)->type = type;
  83         (*breakpoint_p)->set = 0;
  84         (*breakpoint_p)->orig_instr = malloc(CEIL(length, 8));
  85         (*breakpoint_p)->next = NULL;
  86
  87         DEBUG("added %s breakpoint at 0x%8.8x of length 0x%8.8x", breakpoint_type_strings[type], address, length);
  88
  89         return ERROR_OK;
  90 }
  91
  92 int breakpoint_remove(target_t *target, u32 address)
  93 {
  94         breakpoint_t *breakpoint = target->breakpoints;
  95         breakpoint_t **breakpoint_p = &target->breakpoints;
  96         int retval;
  97
  98         while (breakpoint)
  99         {
 100                 if (breakpoint->address == address)
 101                         break;
 102                 breakpoint_p = &breakpoint->next;
 103                 breakpoint = breakpoint->next;
 104         }
 105
 106         if (breakpoint)
 107         {
 108                 if ((retval = target->type->remove_breakpoint(target, breakpoint)) != ERROR_OK)
 109                 {
 110                         switch (retval)
 111                         {
 112                                 case ERROR_TARGET_NOT_HALTED:
 113                                         INFO("can't remove breakpoint while target is running");
 114                                         return retval;
 115                                         break;
 116                                 default:
 117                                         ERROR("unknown error");
 118                                         exit(-1);
 119                                         break;
 120                         }
 121                 }
 122                 (*breakpoint_p) = breakpoint->next;
 123                 free(breakpoint->orig_instr);
 124                 free(breakpoint);
 125         }
 126         else
 127         {
 128                 ERROR("no breakpoint at address 0x%8.8x found", address);
 129         }
 130
 131         return ERROR_OK;
 132 }
 133
 134 breakpoint_t* breakpoint_find(target_t *target, u32 address)
 135 {
 136         breakpoint_t *breakpoint = target->breakpoints;
 137
 138         while (breakpoint)
 139         {
 140                 if (breakpoint->address == address)
 141                         return breakpoint;
 142                 breakpoint = breakpoint->next;
 143         }
 144
 145         return NULL;
 146 }
 147
 148 int watchpoint_add(target_t *target, u32 address, u32 length, enum watchpoint_rw rw, u32 value, u32 mask)
 149 {
 150         watchpoint_t *watchpoint = target->watchpoints;
 151         watchpoint_t **watchpoint_p = &target->watchpoints;
 152         int retval;
 153
 154         while (watchpoint)
 155         {
 156                 if (watchpoint->address == address)
 157                         return ERROR_OK;
 158                 watchpoint_p = &watchpoint->next;
 159                 watchpoint = watchpoint->next;
 160         }
 161
 162         if ((retval = target->type->add_watchpoint(target, address, length, rw)) != ERROR_OK)
 163         {
 164                 switch (retval)
 165                 {
 166                         case ERROR_TARGET_RESOURCE_NOT_AVAILABLE:
 167                                 INFO("can't add %s watchpoint, resource not available", watchpoint_rw_strings[rw]);
 168                                 return retval;
 169                                 break;
 170                         default:
 171                                 ERROR("unknown error");
 172                                 exit(-1);
 173                                 break;
 174                 }
 175         }
 176
 177         (*watchpoint_p) = malloc(sizeof(watchpoint_t));
 178         (*watchpoint_p)->address = address;
 179         (*watchpoint_p)->length = length;
 180         (*watchpoint_p)->value = value;
 181         (*watchpoint_p)->mask = mask;
 182         (*watchpoint_p)->rw = rw;
 183         (*watchpoint_p)->set = 0;
 184         (*watchpoint_p)->next = NULL;
 185
 186         DEBUG("added %s watchpoint at 0x%8.8x of length 0x%8.8x", watchpoint_rw_strings[rw], address, length);
 187
 188         return ERROR_OK;
 189 }
 190
 191 int watchpoint_remove(target_t *target, u32 address)
 192 {
 193         watchpoint_t *watchpoint = target->watchpoints;
 194         watchpoint_t **watchpoint_p = &target->watchpoints;
 195         int retval;
 196
 197         while (watchpoint)
 198         {
 199                 if (watchpoint->address == address)
 200                         break;
 201                 watchpoint_p = &watchpoint->next;
 202                 watchpoint = watchpoint->next;
 203         }
 204
 205         if (watchpoint)
 206         {
 207                 if ((retval = target->type->remove_watchpoint(target, watchpoint)) != ERROR_OK)
 208                 {
 209                         ERROR("BUG: can't remove watchpoint");
 210                         exit(-1);
 211                 }
 212                 (*watchpoint_p) = watchpoint->next;
 213                 free(watchpoint);
 214         }
 215         else
 216         {
 217                 ERROR("no watchpoint at address 0x%8.8x found", address);
 218         }
 219
 220         return ERROR_OK;
 221 }