gdb/target-dcache.c

   1 /* Copyright (C) 1992-2018 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 ((DCACHE *) arg);
  35 }
  36
  37 /* Target dcache is initialized or not.  */
  38
  39 int
  40 target_dcache_init_p (void)
  41 {
  42   DCACHE *dcache
  43     = (DCACHE *) address_space_data (current_program_space->aspace,
  44                                      target_dcache_aspace_key);
  45
  46   return (dcache != NULL);
  47 }
  48
  49 /* Invalidate the target dcache.  */
  50
  51 void
  52 target_dcache_invalidate (void)
  53 {
  54   DCACHE *dcache
  55     = (DCACHE *) address_space_data (current_program_space->aspace,
  56                                      target_dcache_aspace_key);
  57
  58   if (dcache != NULL)
  59     dcache_invalidate (dcache);
  60 }
  61
  62 /* Return the target dcache.  Return NULL if target dcache is not
  63    initialized yet.  */
  64
  65 DCACHE *
  66 target_dcache_get (void)
  67 {
  68   DCACHE *dcache
  69     = (DCACHE *) address_space_data (current_program_space->aspace,
  70                                      target_dcache_aspace_key);
  71
  72   return dcache;
  73 }
  74
  75 /* Return the target dcache.  If it is not initialized yet, initialize
  76    it.  */
  77
  78 DCACHE *
  79 target_dcache_get_or_init (void)
  80 {
  81   DCACHE *dcache
  82     = (DCACHE *) address_space_data (current_program_space->aspace,
  83                                      target_dcache_aspace_key);
  84
  85   if (dcache == NULL)
  86     {
  87       dcache = dcache_init ();
  88       set_address_space_data (current_program_space->aspace,
  89                               target_dcache_aspace_key, dcache);
  90     }
  91
  92   return dcache;
  93 }
  94
  95 /* The option sets this.  */
  96 static int stack_cache_enabled_1 = 1;
  97 /* And set_stack_cache updates this.
  98    The reason for the separation is so that we don't flush the cache for
  99    on->on transitions.  */
 100 static int stack_cache_enabled = 1;
 101
 102 /* This is called *after* the stack-cache has been set.
 103    Flush the cache for off->on and on->off transitions.
 104    There's no real need to flush the cache for on->off transitions,
 105    except cleanliness.  */
 106
 107 static void
 108 set_stack_cache (const char *args, int from_tty, struct cmd_list_element *c)
 109 {
 110   if (stack_cache_enabled != stack_cache_enabled_1)
 111     target_dcache_invalidate ();
 112
 113   stack_cache_enabled = stack_cache_enabled_1;
 114 }
 115
 116 static void
 117 show_stack_cache (struct ui_file *file, int from_tty,
 118                   struct cmd_list_element *c, const char *value)
 119 {
 120   fprintf_filtered (file, _("Cache use for stack accesses is %s.\n"), value);
 121 }
 122
 123 /* Return true if "stack cache" is enabled, otherwise, return false.  */
 124
 125 int
 126 stack_cache_enabled_p (void)
 127 {
 128   return stack_cache_enabled;
 129 }
 130
 131 /* The option sets this.  */
 132
 133 static int code_cache_enabled_1 = 1;
 134
 135 /* And set_code_cache updates this.
 136    The reason for the separation is so that we don't flush the cache for
 137    on->on transitions.  */
 138 static int code_cache_enabled = 1;
 139
 140 /* This is called *after* the code-cache has been set.
 141    Flush the cache for off->on and on->off transitions.
 142    There's no real need to flush the cache for on->off transitions,
 143    except cleanliness.  */
 144
 145 static void
 146 set_code_cache (const char *args, int from_tty, struct cmd_list_element *c)
 147 {
 148   if (code_cache_enabled != code_cache_enabled_1)
 149     target_dcache_invalidate ();
 150
 151   code_cache_enabled = code_cache_enabled_1;
 152 }
 153
 154 /* Show option "code-cache".  */
 155
 156 static void
 157 show_code_cache (struct ui_file *file, int from_tty,
 158                  struct cmd_list_element *c, const char *value)
 159 {
 160   fprintf_filtered (file, _("Cache use for code accesses is %s.\n"), value);
 161 }
 162
 163 /* Return true if "code cache" is enabled, otherwise, return false.  */
 164
 165 int
 166 code_cache_enabled_p (void)
 167 {
 168   return code_cache_enabled;
 169 }
 170
 171 void
 172 _initialize_target_dcache (void)
 173 {
 174   add_setshow_boolean_cmd ("stack-cache", class_support,
 175                            &stack_cache_enabled_1, _("\
 176 Set cache use for stack access."), _("\
 177 Show cache use for stack access."), _("\
 178 When on, use the target memory cache for all stack access, regardless of any\n\
 179 configured memory regions.  This improves remote performance significantly.\n\
 180 By default, caching for stack access is on."),
 181                            set_stack_cache,
 182                            show_stack_cache,
 183                            &setlist, &showlist);
 184
 185   add_setshow_boolean_cmd ("code-cache", class_support,
 186                            &code_cache_enabled_1, _("\
 187 Set cache use for code segment access."), _("\
 188 Show cache use for code segment access."), _("\
 189 When on, use the target memory cache for all code segment accesses,\n\
 190 regardless of any configured memory regions.  This improves remote\n\
 191 performance significantly.  By default, caching for code segment\n\
 192 access is on."),
 193                            set_code_cache,
 194                            show_code_cache,
 195                            &setlist, &showlist);
 196
 197   target_dcache_aspace_key
 198     = register_address_space_data_with_cleanup (NULL,
 199                                                 target_dcache_cleanup);
 200 }