gdb/target-dcache.c

   1 /* Copyright (C) 1992-2015 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   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 3 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, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include "defs.h"
  19 #include "target-dcache.h"
  20 #include "gdbcmd.h"
  21 #include "progspace.h"
  22
  23 /* The target dcache is kept per-address-space.  This key lets us
  24    associate the cache with the address space.  */
  25
  26 static const struct address_space_data *target_dcache_aspace_key;
  27
  28 /* Clean up dcache, represented by ARG, which is associated with
  29    ASPACE.  */
  30
  31 static void
  32 target_dcache_cleanup (struct address_space *aspace, void *arg)
  33 {
  34   dcache_free (arg);
  35 }
  36
  37 /* Target dcache is initialized or not.  */
  38
  39 int
  40 target_dcache_init_p (void)
  41 {
  42   DCACHE *dcache = address_space_data (current_program_space->aspace,
  43                                        target_dcache_aspace_key);
  44
  45   return (dcache != NULL);
  46 }
  47
  48 /* Invalidate the target dcache.  */
  49
  50 void
  51 target_dcache_invalidate (void)
  52 {
  53   DCACHE *dcache = address_space_data (current_program_space->aspace,
  54                                        target_dcache_aspace_key);
  55
  56   if (dcache != NULL)
  57     dcache_invalidate (dcache);
  58 }
  59
  60 /* Return the target dcache.  Return NULL if target dcache is not
  61    initialized yet.  */
  62
  63 DCACHE *
  64 target_dcache_get (void)
  65 {
  66   DCACHE *dcache = address_space_data (current_program_space->aspace,
  67                                        target_dcache_aspace_key);
  68
  69   return dcache;
  70 }
  71
  72 /* Return the target dcache.  If it is not initialized yet, initialize
  73    it.  */
  74
  75 DCACHE *
  76 target_dcache_get_or_init (void)
  77 {
  78   DCACHE *dcache = address_space_data (current_program_space->aspace,
  79                                        target_dcache_aspace_key);
  80
  81   if (dcache == NULL)
  82     {
  83       dcache = dcache_init ();
  84       set_address_space_data (current_program_space->aspace,
  85                               target_dcache_aspace_key, dcache);
  86     }
  87
  88   return dcache;
  89 }
  90
  91 /* The option sets this.  */
  92 static int stack_cache_enabled_1 = 1;
  93 /* And set_stack_cache updates this.
  94    The reason for the separation is so that we don't flush the cache for
  95    on->on transitions.  */
  96 static int stack_cache_enabled = 1;
  97
  98 /* This is called *after* the stack-cache has been set.
  99    Flush the cache for off->on and on->off transitions.
 100    There's no real need to flush the cache for on->off transitions,
 101    except cleanliness.  */
 102
 103 static void
 104 set_stack_cache (char *args, int from_tty, struct cmd_list_element *c)
 105 {
 106   if (stack_cache_enabled != stack_cache_enabled_1)
 107     target_dcache_invalidate ();
 108
 109   stack_cache_enabled = stack_cache_enabled_1;
 110 }
 111
 112 static void
 113 show_stack_cache (struct ui_file *file, int from_tty,
 114                   struct cmd_list_element *c, const char *value)
 115 {
 116   fprintf_filtered (file, _("Cache use for stack accesses is %s.\n"), value);
 117 }
 118
 119 /* Return true if "stack cache" is enabled, otherwise, return false.  */
 120
 121 int
 122 stack_cache_enabled_p (void)
 123 {
 124   return stack_cache_enabled;
 125 }
 126
 127 /* The option sets this.  */
 128
 129 static int code_cache_enabled_1 = 1;
 130
 131 /* And set_code_cache updates this.
 132    The reason for the separation is so that we don't flush the cache for
 133    on->on transitions.  */
 134 static int code_cache_enabled = 1;
 135
 136 /* This is called *after* the code-cache has been set.
 137    Flush the cache for off->on and on->off transitions.
 138    There's no real need to flush the cache for on->off transitions,
 139    except cleanliness.  */
 140
 141 static void
 142 set_code_cache (char *args, int from_tty, struct cmd_list_element *c)
 143 {
 144   if (code_cache_enabled != code_cache_enabled_1)
 145     target_dcache_invalidate ();
 146
 147   code_cache_enabled = code_cache_enabled_1;
 148 }
 149
 150 /* Show option "code-cache".  */
 151
 152 static void
 153 show_code_cache (struct ui_file *file, int from_tty,
 154                  struct cmd_list_element *c, const char *value)
 155 {
 156   fprintf_filtered (file, _("Cache use for code accesses is %s.\n"), value);
 157 }
 158
 159 /* Return true if "code cache" is enabled, otherwise, return false.  */
 160
 161 int
 162 code_cache_enabled_p (void)
 163 {
 164   return code_cache_enabled;
 165 }
 166
 167 /* -Wmissing-prototypes */
 168 extern initialize_file_ftype _initialize_target_dcache;
 169
 170 void
 171 _initialize_target_dcache (void)
 172 {
 173   add_setshow_boolean_cmd ("stack-cache", class_support,
 174                            &stack_cache_enabled_1, _("\
 175 Set cache use for stack access."), _("\
 176 Show cache use for stack access."), _("\
 177 When on, use the target memory cache for all stack access, regardless of any\n\
 178 configured memory regions.  This improves remote performance significantly.\n\
 179 By default, caching for stack access is on."),
 180                            set_stack_cache,
 181                            show_stack_cache,
 182                            &setlist, &showlist);
 183
 184   add_setshow_boolean_cmd ("code-cache", class_support,
 185                            &code_cache_enabled_1, _("\
 186 Set cache use for code segment access."), _("\
 187 Show cache use for code segment access."), _("\
 188 When on, use the target memory cache for all code segment accesses,\n\
 189 regardless of any configured memory regions.  This improves remote\n\
 190 performance significantly.  By default, caching for code segment\n\
 191 access is on."),
 192                            set_code_cache,
 193                            show_code_cache,
 194                            &setlist, &showlist);
 195
 196   target_dcache_aspace_key
 197     = register_address_space_data_with_cleanup (NULL,
 198                                                 target_dcache_cleanup);
 199 }