| 1 | /* Register support routines for the remote server for GDB. |
| 2 | Copyright (C) 2001, 2002, 2004, 2005, 2007, 2008 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "server.h" |
| 21 | #include "regdef.h" |
| 22 | |
| 23 | #include <stdlib.h> |
| 24 | #include <string.h> |
| 25 | |
| 26 | /* The private data for the register cache. Note that we have one |
| 27 | per inferior; this is primarily for simplicity, as the performance |
| 28 | benefit is minimal. */ |
| 29 | |
| 30 | struct inferior_regcache_data |
| 31 | { |
| 32 | int registers_valid; |
| 33 | unsigned char *registers; |
| 34 | }; |
| 35 | |
| 36 | static int register_bytes; |
| 37 | |
| 38 | static struct reg *reg_defs; |
| 39 | static int num_registers; |
| 40 | |
| 41 | const char **gdbserver_expedite_regs; |
| 42 | |
| 43 | static struct inferior_regcache_data * |
| 44 | get_regcache (struct thread_info *inf, int fetch) |
| 45 | { |
| 46 | struct inferior_regcache_data *regcache; |
| 47 | |
| 48 | regcache = (struct inferior_regcache_data *) inferior_regcache_data (inf); |
| 49 | |
| 50 | if (regcache == NULL) |
| 51 | fatal ("no register cache"); |
| 52 | |
| 53 | /* FIXME - fetch registers for INF */ |
| 54 | if (fetch && regcache->registers_valid == 0) |
| 55 | { |
| 56 | fetch_inferior_registers (0); |
| 57 | regcache->registers_valid = 1; |
| 58 | } |
| 59 | |
| 60 | return regcache; |
| 61 | } |
| 62 | |
| 63 | void |
| 64 | regcache_invalidate_one (struct inferior_list_entry *entry) |
| 65 | { |
| 66 | struct thread_info *thread = (struct thread_info *) entry; |
| 67 | struct inferior_regcache_data *regcache; |
| 68 | |
| 69 | regcache = (struct inferior_regcache_data *) inferior_regcache_data (thread); |
| 70 | |
| 71 | if (regcache->registers_valid) |
| 72 | { |
| 73 | struct thread_info *saved_inferior = current_inferior; |
| 74 | |
| 75 | current_inferior = thread; |
| 76 | store_inferior_registers (-1); |
| 77 | current_inferior = saved_inferior; |
| 78 | } |
| 79 | |
| 80 | regcache->registers_valid = 0; |
| 81 | } |
| 82 | |
| 83 | void |
| 84 | regcache_invalidate () |
| 85 | { |
| 86 | for_each_inferior (&all_threads, regcache_invalidate_one); |
| 87 | } |
| 88 | |
| 89 | int |
| 90 | registers_length (void) |
| 91 | { |
| 92 | return 2 * register_bytes; |
| 93 | } |
| 94 | |
| 95 | void * |
| 96 | new_register_cache (void) |
| 97 | { |
| 98 | struct inferior_regcache_data *regcache; |
| 99 | |
| 100 | regcache = malloc (sizeof (*regcache)); |
| 101 | |
| 102 | /* Make sure to zero-initialize the register cache when it is created, |
| 103 | in case there are registers the target never fetches. This way they'll |
| 104 | read as zero instead of garbage. */ |
| 105 | regcache->registers = calloc (1, register_bytes); |
| 106 | if (regcache->registers == NULL) |
| 107 | fatal ("Could not allocate register cache."); |
| 108 | |
| 109 | regcache->registers_valid = 0; |
| 110 | |
| 111 | return regcache; |
| 112 | } |
| 113 | |
| 114 | void |
| 115 | free_register_cache (void *regcache_p) |
| 116 | { |
| 117 | struct inferior_regcache_data *regcache |
| 118 | = (struct inferior_regcache_data *) regcache_p; |
| 119 | |
| 120 | free (regcache->registers); |
| 121 | free (regcache); |
| 122 | } |
| 123 | |
| 124 | static void |
| 125 | realloc_register_cache (struct inferior_list_entry *thread_p) |
| 126 | { |
| 127 | struct thread_info *thread = (struct thread_info *) thread_p; |
| 128 | |
| 129 | free_register_cache (inferior_regcache_data (thread)); |
| 130 | set_inferior_regcache_data (thread, new_register_cache ()); |
| 131 | } |
| 132 | |
| 133 | void |
| 134 | set_register_cache (struct reg *regs, int n) |
| 135 | { |
| 136 | int offset, i; |
| 137 | |
| 138 | reg_defs = regs; |
| 139 | num_registers = n; |
| 140 | |
| 141 | offset = 0; |
| 142 | for (i = 0; i < n; i++) |
| 143 | { |
| 144 | regs[i].offset = offset; |
| 145 | offset += regs[i].size; |
| 146 | } |
| 147 | |
| 148 | register_bytes = offset / 8; |
| 149 | |
| 150 | /* Re-allocate all pre-existing register caches. */ |
| 151 | for_each_inferior (&all_threads, realloc_register_cache); |
| 152 | } |
| 153 | |
| 154 | void |
| 155 | registers_to_string (char *buf) |
| 156 | { |
| 157 | unsigned char *registers = get_regcache (current_inferior, 1)->registers; |
| 158 | |
| 159 | convert_int_to_ascii (registers, buf, register_bytes); |
| 160 | } |
| 161 | |
| 162 | void |
| 163 | registers_from_string (char *buf) |
| 164 | { |
| 165 | int len = strlen (buf); |
| 166 | unsigned char *registers = get_regcache (current_inferior, 1)->registers; |
| 167 | |
| 168 | if (len != register_bytes * 2) |
| 169 | { |
| 170 | warning ("Wrong sized register packet (expected %d bytes, got %d)", 2*register_bytes, len); |
| 171 | if (len > register_bytes * 2) |
| 172 | len = register_bytes * 2; |
| 173 | } |
| 174 | convert_ascii_to_int (buf, registers, len / 2); |
| 175 | } |
| 176 | |
| 177 | struct reg * |
| 178 | find_register_by_name (const char *name) |
| 179 | { |
| 180 | int i; |
| 181 | |
| 182 | for (i = 0; i < num_registers; i++) |
| 183 | if (!strcmp (name, reg_defs[i].name)) |
| 184 | return ®_defs[i]; |
| 185 | fatal ("Unknown register %s requested", name); |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | int |
| 190 | find_regno (const char *name) |
| 191 | { |
| 192 | int i; |
| 193 | |
| 194 | for (i = 0; i < num_registers; i++) |
| 195 | if (!strcmp (name, reg_defs[i].name)) |
| 196 | return i; |
| 197 | fatal ("Unknown register %s requested", name); |
| 198 | return -1; |
| 199 | } |
| 200 | |
| 201 | struct reg * |
| 202 | find_register_by_number (int n) |
| 203 | { |
| 204 | return ®_defs[n]; |
| 205 | } |
| 206 | |
| 207 | int |
| 208 | register_size (int n) |
| 209 | { |
| 210 | return reg_defs[n].size / 8; |
| 211 | } |
| 212 | |
| 213 | static unsigned char * |
| 214 | register_data (int n, int fetch) |
| 215 | { |
| 216 | unsigned char *registers |
| 217 | = get_regcache (current_inferior, fetch)->registers; |
| 218 | |
| 219 | return registers + (reg_defs[n].offset / 8); |
| 220 | } |
| 221 | |
| 222 | void |
| 223 | supply_register (int n, const void *buf) |
| 224 | { |
| 225 | memcpy (register_data (n, 0), buf, register_size (n)); |
| 226 | } |
| 227 | |
| 228 | void |
| 229 | supply_register_by_name (const char *name, const void *buf) |
| 230 | { |
| 231 | supply_register (find_regno (name), buf); |
| 232 | } |
| 233 | |
| 234 | void |
| 235 | collect_register (int n, void *buf) |
| 236 | { |
| 237 | memcpy (buf, register_data (n, 1), register_size (n)); |
| 238 | } |
| 239 | |
| 240 | void |
| 241 | collect_register_as_string (int n, char *buf) |
| 242 | { |
| 243 | convert_int_to_ascii (register_data (n, 1), buf, register_size (n)); |
| 244 | } |
| 245 | |
| 246 | void |
| 247 | collect_register_by_name (const char *name, void *buf) |
| 248 | { |
| 249 | collect_register (find_regno (name), buf); |
| 250 | } |