1 /* Copyright (C) 1992-2016 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 (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 (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 /* -Wmissing-prototypes */ 172 extern initialize_file_ftype _initialize_target_dcache; 173 174 void 175 _initialize_target_dcache (void) 176 { 177 add_setshow_boolean_cmd ("stack-cache", class_support, 178 &stack_cache_enabled_1, _("\ 179 Set cache use for stack access."), _("\ 180 Show cache use for stack access."), _("\ 181 When on, use the target memory cache for all stack access, regardless of any\n\ 182 configured memory regions. This improves remote performance significantly.\n\ 183 By default, caching for stack access is on."), 184 set_stack_cache, 185 show_stack_cache, 186 &setlist, &showlist); 187 188 add_setshow_boolean_cmd ("code-cache", class_support, 189 &code_cache_enabled_1, _("\ 190 Set cache use for code segment access."), _("\ 191 Show cache use for code segment access."), _("\ 192 When on, use the target memory cache for all code segment accesses,\n\ 193 regardless of any configured memory regions. This improves remote\n\ 194 performance significantly. By default, caching for code segment\n\ 195 access is on."), 196 set_code_cache, 197 show_code_cache, 198 &setlist, &showlist); 199 200 target_dcache_aspace_key 201 = register_address_space_data_with_cleanup (NULL, 202 target_dcache_cleanup); 203 } 204