| 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 | } |