sim/common/hw-instances.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 "sim-io.h"
  29 #include "sim-assert.h"
  30
  31 struct hw_instance_data
  32 {
  33   hw_finish_instance_method *to_finish;
  34   struct hw_instance *instances;
  35 };
  36
  37 static hw_finish_instance_method abort_hw_finish_instance;
  38
  39 void
  40 create_hw_instance_data (struct hw *me)
  41 {
  42   me->instances_of_hw = HW_ZALLOC (me, struct hw_instance_data);
  43   set_hw_finish_instance (me, abort_hw_finish_instance);
  44 }
  45
  46 void
  47 delete_hw_instance_data (struct hw *me)
  48 {
  49   /* NOP */
  50 }
  51
  52
  53 static void
  54 abort_hw_finish_instance (struct hw *hw,
  55                           struct hw_instance *instance)
  56 {
  57   hw_abort (hw, "no instance finish method");
  58 }
  59
  60 void
  61 set_hw_finish_instance (struct hw *me,
  62                         hw_finish_instance_method *finish)
  63 {
  64   me->instances_of_hw->to_finish = finish;
  65 }
  66
  67
  68 #if 0
  69 void
  70 clean_hw_instances (struct hw *me)
  71 {
  72   struct hw_instance **instance = &me->instances;
  73   while (*instance != NULL)
  74     {
  75       struct hw_instance *old_instance = *instance;
  76       hw_instance_delete (old_instance);
  77       instance = &me->instances;
  78     }
  79 }
  80 #endif
  81
  82
  83 void
  84 hw_instance_delete (struct hw_instance *instance)
  85 {
  86 #if 1
  87   hw_abort (hw_instance_hw (instance), "not implemented");
  88 #else
  89   struct hw *me = hw_instance_hw (instance);
  90   if (instance->to_instance_delete == NULL)
  91     hw_abort (me, "no delete method");
  92   instance->method->delete (instance);
  93   if (instance->args != NULL)
  94     free (instance->args);
  95   if (instance->path != NULL)
  96     free (instance->path);
  97   if (instance->child == NULL)
  98     {
  99       /* only remove leaf nodes */
 100       struct hw_instance **curr = &me->instances;
 101       while (*curr != instance)
 102         {
 103           ASSERT (*curr != NULL);
 104           curr = &(*curr)->next;
 105         }
 106       *curr = instance->next;
 107     }
 108   else
 109     {
 110       /* check it isn't in the instance list */
 111       struct hw_instance *curr = me->instances;
 112       while (curr != NULL)
 113         {
 114           ASSERT (curr != instance);
 115           curr = curr->next;
 116         }
 117       /* unlink the child */
 118       ASSERT (instance->child->parent == instance);
 119       instance->child->parent = NULL;
 120     }
 121   cap_remove (me->ihandles, instance);
 122   free (instance);
 123 #endif
 124 }
 125
 126
 127 static int
 128 panic_hw_instance_read (struct hw_instance *instance,
 129                         void *addr,
 130                         unsigned_word len)
 131 {
 132   hw_abort (hw_instance_hw (instance), "no read method");
 133   return -1;
 134 }
 135
 136
 137
 138 static int
 139 panic_hw_instance_write (struct hw_instance *instance,
 140                          const void *addr,
 141                          unsigned_word len)
 142 {
 143   hw_abort (hw_instance_hw (instance), "no write method");
 144   return -1;
 145 }
 146
 147
 148 static int
 149 panic_hw_instance_seek (struct hw_instance *instance,
 150                         unsigned_word pos_hi,
 151                         unsigned_word pos_lo)
 152 {
 153   hw_abort (hw_instance_hw (instance), "no seek method");
 154   return -1;
 155 }
 156
 157
 158 int
 159 hw_instance_call_method (struct hw_instance *instance,
 160                          const char *method_name,
 161                          int n_stack_args,
 162                          unsigned_cell stack_args[/*n_stack_args*/],
 163                          int n_stack_returns,
 164                          unsigned_cell stack_returns[/*n_stack_args*/])
 165 {
 166 #if 1
 167   hw_abort (hw_instance_hw (instance), "not implemented");
 168   return -1;
 169 #else
 170   struct hw *me = instance->owner;
 171   const hw_instance_methods *method = instance->method->methods;
 172   if (method == NULL)
 173     {
 174       hw_abort (me, "no methods (want %s)", method_name);
 175     }
 176   while (method->name != NULL)
 177     {
 178       if (strcmp (method->name, method_name) == 0)
 179         {
 180           return method->method (instance,
 181                                  n_stack_args, stack_args,
 182                                  n_stack_returns, stack_returns);
 183         }
 184       method++;
 185     }
 186   hw_abort (me, "no %s method", method_name);
 187   return 0;
 188 #endif
 189 }
 190
 191
 192 #define set_hw_instance_read(instance, method)\
 193 ((instance)->to_instance_read = (method))
 194
 195 #define set_hw_instance_write(instance, method)\
 196 ((instance)->to_instance_write = (method))
 197
 198 #define set_hw_instance_seek(instance, method)\
 199 ((instance)->to_instance_seek = (method))
 200
 201
 202 #if 0
 203 static void
 204 set_hw_instance_finish (struct hw *me,
 205                         hw_instance_finish_method *method)
 206 {
 207   if (me->instances_of_hw == NULL)
 208     me->instances_of_hw = HW_ZALLOC (me, struct hw_instance_data);
 209   me->instances_of_hw->to_finish = method;
 210 }
 211 #endif
 212
 213
 214 struct hw_instance *
 215 hw_instance_create (struct hw *me,
 216                     struct hw_instance *parent,
 217                     const char *path,
 218                     const char *args)
 219 {
 220   struct hw_instance *instance = ZALLOC (struct hw_instance);
 221   /*instance->unit*/
 222   /* link this instance into the devices list */
 223   instance->hw_of_instance = me;
 224   instance->parent_of_instance = NULL;
 225   /* link this instance into the front of the devices instance list */
 226   instance->sibling_of_instance = me->instances_of_hw->instances;
 227   me->instances_of_hw->instances = instance;
 228   if (parent != NULL)
 229     {
 230       ASSERT (parent->child_of_instance == NULL);
 231       parent->child_of_instance = instance;
 232       instance->parent_of_instance = parent;
 233     }
 234   instance->args_of_instance = hw_strdup (me, args);
 235   instance->path_of_instance = hw_strdup (me, path);
 236   set_hw_instance_read (instance, panic_hw_instance_read);
 237   set_hw_instance_write (instance, panic_hw_instance_write);
 238   set_hw_instance_seek (instance, panic_hw_instance_seek);
 239   hw_handle_add_ihandle (me, instance);
 240   me->instances_of_hw->to_finish (me, instance);
 241   return instance;
 242 }
 243
 244
 245 struct hw_instance *
 246 hw_instance_interceed (struct hw_instance *parent,
 247                        const char *path,
 248                        const char *args)
 249 {
 250 #if 1
 251   return NULL;
 252 #else
 253   struct hw_instance *instance = ZALLOC (struct hw_instance);
 254   /*instance->unit*/
 255   /* link this instance into the devices list */
 256   if (me != NULL)
 257     {
 258       ASSERT (parent == NULL);
 259       instance->hw_of_instance = me;
 260       instance->parent_of_instance = NULL;
 261       /* link this instance into the front of the devices instance list */
 262       instance->sibling_of_instance = me->instances_of_hw->instances;
 263       me->instances_of_hw->instances = instance;
 264     }
 265   if (parent != NULL)
 266     {
 267       struct hw_instance **previous;
 268       ASSERT (parent->child_of_instance == NULL);
 269       parent->child_of_instance = instance;
 270       instance->owner = parent->owner;
 271       instance->parent_of_instance = parent;
 272       /* in the devices instance list replace the parent instance with
 273          this one */
 274       instance->next = parent->next;
 275       /* replace parent with this new node */
 276       previous = &instance->owner->instances;
 277       while (*previous != parent)
 278         {
 279           ASSERT (*previous != NULL);
 280           previous = &(*previous)->next;
 281         }
 282       *previous = instance;
 283     }
 284   instance->data = data;
 285   instance->args = (args == NULL ? NULL : (char *) strdup (args));
 286   instance->path = (path == NULL ? NULL : (char *) strdup (path));
 287   cap_add (instance->owner->ihandles, instance);
 288   return instance;
 289 #endif
 290 }