sewardj | 3b29048 | 2011-05-06 21:02:55 +0000 | [diff] [blame^] | 1 | /* Register support routines for the remote server for GDB. |
| 2 | Copyright (C) 2001, 2002, 2004, 2005, 2011 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | It has been modified to integrate it in valgrind |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 2 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program; if not, write to the Free Software |
| 20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 21 | Boston, MA 02110-1301, USA. */ |
| 22 | |
| 23 | #include "server.h" |
| 24 | #include "regdef.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 | Bool *register_supplied; /* set to True once it has been supplied */ |
| 35 | }; |
| 36 | |
| 37 | static int register_bytes; |
| 38 | |
| 39 | static struct reg *reg_defs; |
| 40 | static int num_registers; |
| 41 | |
| 42 | const char **gdbserver_expedite_regs; |
| 43 | |
| 44 | static |
| 45 | struct inferior_regcache_data * get_regcache (struct thread_info *inf, |
| 46 | int fetch) |
| 47 | { |
| 48 | struct inferior_regcache_data *regcache; |
| 49 | |
| 50 | regcache = (struct inferior_regcache_data *) inferior_regcache_data (inf); |
| 51 | |
| 52 | if (regcache == NULL) |
| 53 | fatal ("no register cache\n"); |
| 54 | |
| 55 | /* FIXME - fetch registers for INF */ |
| 56 | if (fetch && regcache->registers_valid == 0) { |
| 57 | fetch_inferior_registers (0); |
| 58 | regcache->registers_valid = 1; |
| 59 | } |
| 60 | |
| 61 | return regcache; |
| 62 | } |
| 63 | |
| 64 | void 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 | struct thread_info *saved_inferior = current_inferior; |
| 73 | |
| 74 | current_inferior = thread; |
| 75 | store_inferior_registers (-1); |
| 76 | current_inferior = saved_inferior; |
| 77 | } |
| 78 | |
| 79 | regcache->registers_valid = 0; |
| 80 | } |
| 81 | |
| 82 | void regcache_invalidate () |
| 83 | { |
| 84 | for_each_inferior (&all_threads, regcache_invalidate_one); |
| 85 | } |
| 86 | |
| 87 | int registers_length (void) |
| 88 | { |
| 89 | return 2 * register_bytes; |
| 90 | } |
| 91 | |
| 92 | void *new_register_cache (void) |
| 93 | { |
| 94 | struct inferior_regcache_data *regcache; |
| 95 | |
| 96 | regcache = malloc (sizeof (*regcache)); |
| 97 | |
| 98 | /* Make sure to zero-initialize the register cache when it is created, |
| 99 | in case there are registers the target never fetches. This way they'll |
| 100 | read as zero instead of garbage. */ |
| 101 | regcache->registers = calloc (1, register_bytes); |
| 102 | if (regcache->registers == NULL) |
| 103 | fatal ("Could not allocate register cache.\n"); |
| 104 | |
| 105 | regcache->register_supplied = calloc (1, num_registers); |
| 106 | if (regcache->register_supplied == NULL) |
| 107 | fatal ("Could not allocate register_supplied cache.\n"); |
| 108 | |
| 109 | regcache->registers_valid = 0; |
| 110 | |
| 111 | return regcache; |
| 112 | } |
| 113 | |
| 114 | void free_register_cache (void *regcache_p) |
| 115 | { |
| 116 | struct inferior_regcache_data *regcache |
| 117 | = (struct inferior_regcache_data *) regcache_p; |
| 118 | |
| 119 | free (regcache->registers); |
| 120 | free (regcache->register_supplied); |
| 121 | free (regcache); |
| 122 | } |
| 123 | |
| 124 | /* if a regcache exists for entry, reallocate it. |
| 125 | This is needed if the shadow registers are added. |
| 126 | In such a case, a 2nd call to set_register_cache is done |
| 127 | which will cause the reallocation of already created caches. */ |
| 128 | static |
| 129 | void regcache_realloc_one (struct inferior_list_entry *entry) |
| 130 | { |
| 131 | struct thread_info *thread = (struct thread_info *) entry; |
| 132 | struct inferior_regcache_data *regcache; |
| 133 | |
| 134 | regcache = (struct inferior_regcache_data *) inferior_regcache_data (thread); |
| 135 | |
| 136 | if (regcache) { |
| 137 | free_register_cache (regcache); |
| 138 | set_inferior_regcache_data (thread, new_register_cache ()); |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | void set_register_cache (struct reg *regs, int n) |
| 143 | { |
| 144 | int offset, i; |
| 145 | |
| 146 | reg_defs = regs; |
| 147 | num_registers = n; |
| 148 | |
| 149 | offset = 0; |
| 150 | for (i = 0; i < n; i++) { |
| 151 | regs[i].offset = offset; |
| 152 | offset += regs[i].size; |
| 153 | } |
| 154 | |
| 155 | register_bytes = offset / 8; |
| 156 | |
| 157 | for_each_inferior (&all_threads, regcache_realloc_one); |
| 158 | } |
| 159 | |
| 160 | void registers_to_string (char *buf) |
| 161 | { |
| 162 | unsigned char *registers = get_regcache (current_inferior, 1)->registers; |
| 163 | |
| 164 | convert_int_to_ascii (registers, buf, register_bytes); |
| 165 | } |
| 166 | |
| 167 | void registers_from_string (char *buf) |
| 168 | { |
| 169 | int len = strlen (buf); |
| 170 | unsigned char *registers = get_regcache (current_inferior, 1)->registers; |
| 171 | |
| 172 | if (len != register_bytes * 2) { |
| 173 | warning ("Wrong sized register packet (expected %d bytes, got %d)\n", |
| 174 | 2*register_bytes, len); |
| 175 | if (len > register_bytes * 2) |
| 176 | len = register_bytes * 2; |
| 177 | } |
| 178 | convert_ascii_to_int (buf, registers, len / 2); |
| 179 | } |
| 180 | |
| 181 | int find_regno (const char *name) |
| 182 | { |
| 183 | int i; |
| 184 | |
| 185 | for (i = 0; i < num_registers; i++) |
| 186 | if (!strcmp (name, reg_defs[i].name)) |
| 187 | return i; |
| 188 | fatal ("Unknown register %s requested\n", name); |
| 189 | return -1; |
| 190 | } |
| 191 | |
| 192 | struct reg *find_register_by_number (int n) |
| 193 | { |
| 194 | return ®_defs[n]; |
| 195 | } |
| 196 | |
| 197 | int register_size (int n) |
| 198 | { |
| 199 | return reg_defs[n].size / 8; |
| 200 | } |
| 201 | |
| 202 | static |
| 203 | unsigned char *register_data (int n, int fetch) |
| 204 | { |
| 205 | unsigned char *registers |
| 206 | = get_regcache (current_inferior, fetch)->registers; |
| 207 | |
| 208 | return registers + (reg_defs[n].offset / 8); |
| 209 | } |
| 210 | static |
| 211 | unsigned char *register_data_for_supply (int n, int fetch, Bool *mod) |
| 212 | { |
| 213 | struct inferior_regcache_data * cache |
| 214 | = get_regcache (current_inferior, fetch); |
| 215 | unsigned char *registers = cache->registers; |
| 216 | |
| 217 | if (cache->register_supplied[n]) |
| 218 | *mod = False; |
| 219 | else |
| 220 | *mod = True; |
| 221 | cache->register_supplied[n] = True; |
| 222 | return registers + (reg_defs[n].offset / 8); |
| 223 | } |
| 224 | |
| 225 | void supply_register (int n, const void *buf, Bool *mod) |
| 226 | { |
| 227 | Bool new; |
| 228 | VG_(dmemcpy) (register_data_for_supply (n, 0, &new), |
| 229 | buf, register_size (n), mod); |
| 230 | if (new) |
| 231 | *mod = True; |
| 232 | } |
| 233 | |
| 234 | void supply_register_from_string (int n, const char *buf, Bool *mod) |
| 235 | { |
| 236 | Bool new; |
| 237 | unsigned char bytes_register[register_size (n)]; |
| 238 | convert_ascii_to_int ((char *) buf, bytes_register, register_size (n)); |
| 239 | VG_(dmemcpy) (register_data_for_supply (n, 0, &new), |
| 240 | bytes_register, register_size (n), mod); |
| 241 | if (new) |
| 242 | *mod = True; |
| 243 | } |
| 244 | |
| 245 | void supply_register_by_name (const char *name, const void *buf, Bool *mod) |
| 246 | { |
| 247 | supply_register (find_regno (name), buf, mod); |
| 248 | } |
| 249 | |
| 250 | void collect_register (int n, void *buf) |
| 251 | { |
| 252 | VG_(memcpy) (buf, register_data (n, 1), register_size (n)); |
| 253 | } |
| 254 | |
| 255 | void collect_register_as_string (int n, char *buf) |
| 256 | { |
| 257 | convert_int_to_ascii (register_data (n, 1), buf, register_size (n)); |
| 258 | } |
| 259 | |
| 260 | void collect_register_by_name (const char *name, void *buf) |
| 261 | { |
| 262 | collect_register (find_regno (name), buf); |
| 263 | } |