sim/common/hw-handles.c

   1 /* The common simulator framework for GDB, the GNU Debugger.
   2
   3    Copyright 2002-2021 Free Software Foundation, Inc.
   4
   5    Contributed by Andrew Cagney and Red Hat.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 /* This must come before any other includes.  */
  23 #include "defs.h"
  24
  25 #include "hw-main.h"
  26 #include "hw-base.h"
  27
  28 #include <stdlib.h>
  29
  30 struct hw_handle_mapping
  31 {
  32   cell_word external;
  33   struct hw *phandle;
  34   struct hw_instance *ihandle;
  35   struct hw_handle_mapping *next;
  36 };
  37
  38
  39 struct hw_handle_data
  40 {
  41   int nr_mappings;
  42   struct hw_handle_mapping *mappings;
  43 };
  44
  45 void
  46 create_hw_handle_data (struct hw *hw)
  47 {
  48   if (hw_parent (hw) == NULL)
  49     {
  50       hw->handles_of_hw = HW_ZALLOC (hw, struct hw_handle_data);
  51     }
  52   else
  53     {
  54       hw->handles_of_hw = hw_root (hw)->handles_of_hw;
  55     }
  56 }
  57
  58 void
  59 delete_hw_handle_data (struct hw *hw)
  60 {
  61   /* NULL */
  62 }
  63
  64
  65
  66 #if 0
  67 void
  68 hw_handle_init (struct hw *hw)
  69 {
  70   struct hw_handle_mapping *current_map = db->mappings;
  71   if (current_map != NULL)
  72     {
  73       db->nr_mappings = db->mappings->external;
  74       /* verify that the mappings that were not removed are in
  75          sequence down to nr 1 */
  76       while (current_map->next != NULL)
  77         {
  78           if (current_map->external != current_map->next->external + 1)
  79             error ("hw_handle: hw_handle database possibly corrupt");
  80           current_map = current_map->next;
  81         }
  82       ASSERT (current_map->next == NULL);
  83       if (current_map->external != 1)
  84         error ("hw_handle: hw_handle database possibly corrupt");
  85     }
  86   else
  87     {
  88       db->nr_mappings = 0;
  89     }
  90 }
  91 #endif
  92
  93
  94 struct hw_instance *
  95 hw_handle_ihandle2 (struct hw *hw,
  96                     cell_word external)
  97 {
  98   struct hw_handle_data *db = hw->handles_of_hw;
  99   struct hw_handle_mapping *current_map = db->mappings;
 100   while (current_map != NULL)
 101     {
 102       if (current_map->external == external)
 103         return current_map->ihandle;
 104       current_map = current_map->next;
 105     }
 106   return (void*)0;
 107 }
 108
 109
 110 struct hw *
 111 hw_handle_phandle2 (struct hw *hw,
 112                     cell_word external)
 113 {
 114   struct hw_handle_data *db = hw->handles_of_hw;
 115   struct hw_handle_mapping *current_map = db->mappings;
 116   while (current_map != NULL)
 117     {
 118       if (current_map->external == external)
 119         return current_map->phandle;
 120       current_map = current_map->next;
 121     }
 122   return (void*)0;
 123 }
 124
 125
 126 cell_word
 127 hw_handle_2ihandle (struct hw *hw,
 128                     struct hw_instance *internal)
 129 {
 130   struct hw_handle_data *db = hw->handles_of_hw;
 131   struct hw_handle_mapping *current_map = db->mappings;
 132   while (current_map != NULL)
 133     {
 134       if (current_map->ihandle == internal)
 135         return current_map->external;
 136       current_map = current_map->next;
 137     }
 138   return 0;
 139 }
 140
 141
 142 cell_word
 143 hw_handle_2phandle (struct hw *hw,
 144                     struct hw *internal)
 145 {
 146   struct hw_handle_data *db = hw->handles_of_hw;
 147   struct hw_handle_mapping *current_map = db->mappings;
 148   while (current_map != NULL)
 149     {
 150       if (current_map->phandle == internal)
 151         return current_map->external;
 152       current_map = current_map->next;
 153     }
 154   return 0;
 155 }
 156
 157
 158 void
 159 hw_handle_add_ihandle (struct hw *hw,
 160                        struct hw_instance *internal)
 161 {
 162   struct hw_handle_data *db = hw->handles_of_hw;
 163   if (hw_handle_2ihandle (hw, internal) != 0)
 164     {
 165       hw_abort (hw, "attempting to add an ihandle already in the data base");
 166     }
 167   else
 168     {
 169       /* insert at the front making things in decending order */
 170       struct hw_handle_mapping *new_map = ZALLOC (struct hw_handle_mapping);
 171       new_map->next = db->mappings;
 172       new_map->ihandle = internal;
 173       db->nr_mappings += 1;
 174       new_map->external = db->nr_mappings;
 175       db->mappings = new_map;
 176     }
 177 }
 178
 179
 180 void
 181 hw_handle_add_phandle (struct hw *hw,
 182                        struct hw *internal)
 183 {
 184   struct hw_handle_data *db = hw->handles_of_hw;
 185   if (hw_handle_2phandle (hw, internal) != 0)
 186     {
 187       hw_abort (hw, "attempting to add a phandle already in the data base");
 188     }
 189   else
 190     {
 191       /* insert at the front making things in decending order */
 192       struct hw_handle_mapping *new_map = ZALLOC (struct hw_handle_mapping);
 193       new_map->next = db->mappings;
 194       new_map->phandle = internal;
 195       db->nr_mappings += 1;
 196       new_map->external = db->nr_mappings;
 197       db->mappings = new_map;
 198     }
 199 }
 200
 201
 202 void
 203 hw_handle_remove_ihandle (struct hw *hw,
 204                           struct hw_instance *internal)
 205 {
 206   struct hw_handle_data *db = hw->handles_of_hw;
 207   struct hw_handle_mapping **current_map = &db->mappings;
 208   while (*current_map != NULL)
 209     {
 210       if ((*current_map)->ihandle == internal)
 211         {
 212           struct hw_handle_mapping *delete = *current_map;
 213           *current_map = delete->next;
 214           free (delete);
 215           return;
 216         }
 217       current_map = &(*current_map)->next;
 218     }
 219   hw_abort (hw, "attempt to remove nonexistant ihandle");
 220 }
 221
 222
 223 void
 224 hw_handle_remove_phandle (struct hw *hw,
 225                           struct hw *internal)
 226 {
 227   struct hw_handle_data *db = hw->handles_of_hw;
 228   struct hw_handle_mapping **current_map = &db->mappings;
 229   while (*current_map != NULL)
 230     {
 231       if ((*current_map)->phandle == internal)
 232         {
 233           struct hw_handle_mapping *delete = *current_map;
 234           *current_map = delete->next;
 235           free (delete);
 236           return;
 237         }
 238       current_map = &(*current_map)->next;
 239     }
 240   hw_abort (hw, "attempt to remove nonexistant phandle");
 241 }