gdb/target-dcache.c

   1 /* Copyright (C) 1992-2020 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_key<DCACHE, dcache_deleter>
  27   target_dcache_aspace_key;
  28
  29 /* Target dcache is initialized or not.  */
  30
  31 int
  32 target_dcache_init_p (void)
  33 {
  34   DCACHE *dcache
  35     = target_dcache_aspace_key.get (current_program_space->aspace);
  36
  37   return (dcache != NULL);
  38 }
  39
  40 /* Invalidate the target dcache.  */
  41
  42 void
  43 target_dcache_invalidate (void)
  44 {
  45   DCACHE *dcache
  46     = target_dcache_aspace_key.get (current_program_space->aspace);
  47
  48   if (dcache != NULL)
  49     dcache_invalidate (dcache);
  50 }
  51
  52 /* Return the target dcache.  Return NULL if target dcache is not
  53    initialized yet.  */
  54
  55 DCACHE *
  56 target_dcache_get (void)
  57 {
  58   return target_dcache_aspace_key.get (current_program_space->aspace);
  59 }
  60
  61 /* Return the target dcache.  If it is not initialized yet, initialize
  62    it.  */
  63
  64 DCACHE *
  65 target_dcache_get_or_init (void)
  66 {
  67   DCACHE *dcache
  68     = target_dcache_aspace_key.get (current_program_space->aspace);
  69
  70   if (dcache == NULL)
  71     {
  72       dcache = dcache_init ();
  73       target_dcache_aspace_key.set (current_program_space->aspace, dcache);
  74     }
  75
  76   return dcache;
  77 }
  78
  79 /* The option sets this.  */
  80 static bool stack_cache_enabled_1 = true;
  81 /* And set_stack_cache updates this.
  82    The reason for the separation is so that we don't flush the cache for
  83    on->on transitions.  */
  84 static int stack_cache_enabled = 1;
  85
  86 /* This is called *after* the stack-cache has been set.
  87    Flush the cache for off->on and on->off transitions.
  88    There's no real need to flush the cache for on->off transitions,
  89    except cleanliness.  */
  90
  91 static void
  92 set_stack_cache (const char *args, int from_tty, struct cmd_list_element *c)
  93 {
  94   if (stack_cache_enabled != stack_cache_enabled_1)
  95     target_dcache_invalidate ();
  96
  97   stack_cache_enabled = stack_cache_enabled_1;
  98 }
  99
 100 static void
 101 show_stack_cache (struct ui_file *file, int from_tty,
 102                   struct cmd_list_element *c, const char *value)
 103 {
 104   fprintf_filtered (file, _("Cache use for stack accesses is %s.\n"), value);
 105 }
 106
 107 /* Return true if "stack cache" is enabled, otherwise, return false.  */
 108
 109 int
 110 stack_cache_enabled_p (void)
 111 {
 112   return stack_cache_enabled;
 113 }
 114
 115 /* The option sets this.  */
 116
 117 static bool code_cache_enabled_1 = true;
 118
 119 /* And set_code_cache updates this.
 120    The reason for the separation is so that we don't flush the cache for
 121    on->on transitions.  */
 122 static int code_cache_enabled = 1;
 123
 124 /* This is called *after* the code-cache has been set.
 125    Flush the cache for off->on and on->off transitions.
 126    There's no real need to flush the cache for on->off transitions,
 127    except cleanliness.  */
 128
 129 static void
 130 set_code_cache (const char *args, int from_tty, struct cmd_list_element *c)
 131 {
 132   if (code_cache_enabled != code_cache_enabled_1)
 133     target_dcache_invalidate ();
 134
 135   code_cache_enabled = code_cache_enabled_1;
 136 }
 137
 138 /* Show option "code-cache".  */
 139
 140 static void
 141 show_code_cache (struct ui_file *file, int from_tty,
 142                  struct cmd_list_element *c, const char *value)
 143 {
 144   fprintf_filtered (file, _("Cache use for code accesses is %s.\n"), value);
 145 }
 146
 147 /* Return true if "code cache" is enabled, otherwise, return false.  */
 148
 149 int
 150 code_cache_enabled_p (void)
 151 {
 152   return code_cache_enabled;
 153 }
 154
 155 void
 156 _initialize_target_dcache (void)
 157 {
 158   add_setshow_boolean_cmd ("stack-cache", class_support,
 159                            &stack_cache_enabled_1, _("\
 160 Set cache use for stack access."), _("\
 161 Show cache use for stack access."), _("\
 162 When on, use the target memory cache for all stack access, regardless of any\n\
 163 configured memory regions.  This improves remote performance significantly.\n\
 164 By default, caching for stack access is on."),
 165                            set_stack_cache,
 166                            show_stack_cache,
 167                            &setlist, &showlist);
 168
 169   add_setshow_boolean_cmd ("code-cache", class_support,
 170                            &code_cache_enabled_1, _("\
 171 Set cache use for code segment access."), _("\
 172 Show cache use for code segment access."), _("\
 173 When on, use the target memory cache for all code segment accesses,\n\
 174 regardless of any configured memory regions.  This improves remote\n\
 175 performance significantly.  By default, caching for code segment\n\
 176 access is on."),
 177                            set_code_cache,
 178                            show_code_cache,
 179                            &setlist, &showlist);
 180 }