| 1 | /* Base/prototype target for default child (native) targets. |
| 2 | |
| 3 | Copyright (C) 1988-2015 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 | /* This file provides a common base class/target that all native |
| 21 | target implementations extend, by calling inf_child_target to get a |
| 22 | new prototype target and then overriding target methods as |
| 23 | necessary. */ |
| 24 | |
| 25 | #include "defs.h" |
| 26 | #include "regcache.h" |
| 27 | #include "memattr.h" |
| 28 | #include "symtab.h" |
| 29 | #include "target.h" |
| 30 | #include "inferior.h" |
| 31 | #include <sys/stat.h> |
| 32 | #include "inf-child.h" |
| 33 | #include "fileio.h" |
| 34 | #include "agent.h" |
| 35 | #include "gdb_wait.h" |
| 36 | #include "filestuff.h" |
| 37 | |
| 38 | #include <sys/types.h> |
| 39 | #include <fcntl.h> |
| 40 | #include <unistd.h> |
| 41 | |
| 42 | /* A pointer to what is returned by inf_child_target. Used by |
| 43 | inf_child_open to push the most-derived target in reaction to |
| 44 | "target native". */ |
| 45 | static struct target_ops *inf_child_ops = NULL; |
| 46 | |
| 47 | /* Helper function for child_wait and the derivatives of child_wait. |
| 48 | HOSTSTATUS is the waitstatus from wait() or the equivalent; store our |
| 49 | translation of that in OURSTATUS. */ |
| 50 | void |
| 51 | store_waitstatus (struct target_waitstatus *ourstatus, int hoststatus) |
| 52 | { |
| 53 | if (WIFEXITED (hoststatus)) |
| 54 | { |
| 55 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
| 56 | ourstatus->value.integer = WEXITSTATUS (hoststatus); |
| 57 | } |
| 58 | else if (!WIFSTOPPED (hoststatus)) |
| 59 | { |
| 60 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| 61 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (hoststatus)); |
| 62 | } |
| 63 | else |
| 64 | { |
| 65 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| 66 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (hoststatus)); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this |
| 71 | for all registers. */ |
| 72 | |
| 73 | static void |
| 74 | inf_child_fetch_inferior_registers (struct target_ops *ops, |
| 75 | struct regcache *regcache, int regnum) |
| 76 | { |
| 77 | if (regnum == -1) |
| 78 | { |
| 79 | for (regnum = 0; |
| 80 | regnum < gdbarch_num_regs (get_regcache_arch (regcache)); |
| 81 | regnum++) |
| 82 | regcache_raw_supply (regcache, regnum, NULL); |
| 83 | } |
| 84 | else |
| 85 | regcache_raw_supply (regcache, regnum, NULL); |
| 86 | } |
| 87 | |
| 88 | /* Store register REGNUM back into the inferior. If REGNUM is -1, do |
| 89 | this for all registers (including the floating point registers). */ |
| 90 | |
| 91 | static void |
| 92 | inf_child_store_inferior_registers (struct target_ops *ops, |
| 93 | struct regcache *regcache, int regnum) |
| 94 | { |
| 95 | } |
| 96 | |
| 97 | static void |
| 98 | inf_child_post_attach (struct target_ops *self, int pid) |
| 99 | { |
| 100 | /* This target doesn't require a meaningful "post attach" operation |
| 101 | by a debugger. */ |
| 102 | } |
| 103 | |
| 104 | /* Get ready to modify the registers array. On machines which store |
| 105 | individual registers, this doesn't need to do anything. On |
| 106 | machines which store all the registers in one fell swoop, this |
| 107 | makes sure that registers contains all the registers from the |
| 108 | program being debugged. */ |
| 109 | |
| 110 | static void |
| 111 | inf_child_prepare_to_store (struct target_ops *self, |
| 112 | struct regcache *regcache) |
| 113 | { |
| 114 | } |
| 115 | |
| 116 | /* True if the user did "target native". In that case, we won't |
| 117 | unpush the child target automatically when the last inferior is |
| 118 | gone. */ |
| 119 | static int inf_child_explicitly_opened; |
| 120 | |
| 121 | /* See inf-child.h. */ |
| 122 | |
| 123 | void |
| 124 | inf_child_open_target (struct target_ops *target, const char *arg, |
| 125 | int from_tty) |
| 126 | { |
| 127 | target_preopen (from_tty); |
| 128 | push_target (target); |
| 129 | inf_child_explicitly_opened = 1; |
| 130 | if (from_tty) |
| 131 | printf_filtered ("Done. Use the \"run\" command to start a process.\n"); |
| 132 | } |
| 133 | |
| 134 | static void |
| 135 | inf_child_open (const char *arg, int from_tty) |
| 136 | { |
| 137 | inf_child_open_target (inf_child_ops, arg, from_tty); |
| 138 | } |
| 139 | |
| 140 | /* Implement the to_disconnect target_ops method. */ |
| 141 | |
| 142 | static void |
| 143 | inf_child_disconnect (struct target_ops *target, const char *args, int from_tty) |
| 144 | { |
| 145 | if (args != NULL) |
| 146 | error (_("Argument given to \"disconnect\".")); |
| 147 | |
| 148 | /* This offers to detach/kill current inferiors, and then pops all |
| 149 | targets. */ |
| 150 | target_preopen (from_tty); |
| 151 | } |
| 152 | |
| 153 | /* Implement the to_close target_ops method. */ |
| 154 | |
| 155 | static void |
| 156 | inf_child_close (struct target_ops *target) |
| 157 | { |
| 158 | /* In case we were forcibly closed. */ |
| 159 | inf_child_explicitly_opened = 0; |
| 160 | } |
| 161 | |
| 162 | void |
| 163 | inf_child_mourn_inferior (struct target_ops *ops) |
| 164 | { |
| 165 | generic_mourn_inferior (); |
| 166 | inf_child_maybe_unpush_target (ops); |
| 167 | } |
| 168 | |
| 169 | /* See inf-child.h. */ |
| 170 | |
| 171 | void |
| 172 | inf_child_maybe_unpush_target (struct target_ops *ops) |
| 173 | { |
| 174 | if (!inf_child_explicitly_opened && !have_inferiors ()) |
| 175 | unpush_target (ops); |
| 176 | } |
| 177 | |
| 178 | static void |
| 179 | inf_child_post_startup_inferior (struct target_ops *self, ptid_t ptid) |
| 180 | { |
| 181 | /* This target doesn't require a meaningful "post startup inferior" |
| 182 | operation by a debugger. */ |
| 183 | } |
| 184 | |
| 185 | static int |
| 186 | inf_child_follow_fork (struct target_ops *ops, int follow_child, |
| 187 | int detach_fork) |
| 188 | { |
| 189 | /* This target doesn't support following fork or vfork events. */ |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | static int |
| 194 | inf_child_can_run (struct target_ops *self) |
| 195 | { |
| 196 | return 1; |
| 197 | } |
| 198 | |
| 199 | static char * |
| 200 | inf_child_pid_to_exec_file (struct target_ops *self, int pid) |
| 201 | { |
| 202 | /* This target doesn't support translation of a process ID to the |
| 203 | filename of the executable file. */ |
| 204 | return NULL; |
| 205 | } |
| 206 | |
| 207 | /* Implementation of to_fileio_open. */ |
| 208 | |
| 209 | static int |
| 210 | inf_child_fileio_open (struct target_ops *self, |
| 211 | struct inferior *inf, const char *filename, |
| 212 | int flags, int mode, int warn_if_slow, |
| 213 | int *target_errno) |
| 214 | { |
| 215 | int nat_flags; |
| 216 | mode_t nat_mode; |
| 217 | int fd; |
| 218 | |
| 219 | if (fileio_to_host_openflags (flags, &nat_flags) == -1 |
| 220 | || fileio_to_host_mode (mode, &nat_mode) == -1) |
| 221 | { |
| 222 | *target_errno = FILEIO_EINVAL; |
| 223 | return -1; |
| 224 | } |
| 225 | |
| 226 | fd = gdb_open_cloexec (filename, nat_flags, nat_mode); |
| 227 | if (fd == -1) |
| 228 | *target_errno = host_to_fileio_error (errno); |
| 229 | |
| 230 | return fd; |
| 231 | } |
| 232 | |
| 233 | /* Implementation of to_fileio_pwrite. */ |
| 234 | |
| 235 | static int |
| 236 | inf_child_fileio_pwrite (struct target_ops *self, |
| 237 | int fd, const gdb_byte *write_buf, int len, |
| 238 | ULONGEST offset, int *target_errno) |
| 239 | { |
| 240 | int ret; |
| 241 | |
| 242 | #ifdef HAVE_PWRITE |
| 243 | ret = pwrite (fd, write_buf, len, (long) offset); |
| 244 | #else |
| 245 | ret = -1; |
| 246 | #endif |
| 247 | /* If we have no pwrite or it failed for this file, use lseek/write. */ |
| 248 | if (ret == -1) |
| 249 | { |
| 250 | ret = lseek (fd, (long) offset, SEEK_SET); |
| 251 | if (ret != -1) |
| 252 | ret = write (fd, write_buf, len); |
| 253 | } |
| 254 | |
| 255 | if (ret == -1) |
| 256 | *target_errno = host_to_fileio_error (errno); |
| 257 | |
| 258 | return ret; |
| 259 | } |
| 260 | |
| 261 | /* Implementation of to_fileio_pread. */ |
| 262 | |
| 263 | static int |
| 264 | inf_child_fileio_pread (struct target_ops *self, |
| 265 | int fd, gdb_byte *read_buf, int len, |
| 266 | ULONGEST offset, int *target_errno) |
| 267 | { |
| 268 | int ret; |
| 269 | |
| 270 | #ifdef HAVE_PREAD |
| 271 | ret = pread (fd, read_buf, len, (long) offset); |
| 272 | #else |
| 273 | ret = -1; |
| 274 | #endif |
| 275 | /* If we have no pread or it failed for this file, use lseek/read. */ |
| 276 | if (ret == -1) |
| 277 | { |
| 278 | ret = lseek (fd, (long) offset, SEEK_SET); |
| 279 | if (ret != -1) |
| 280 | ret = read (fd, read_buf, len); |
| 281 | } |
| 282 | |
| 283 | if (ret == -1) |
| 284 | *target_errno = host_to_fileio_error (errno); |
| 285 | |
| 286 | return ret; |
| 287 | } |
| 288 | |
| 289 | /* Implementation of to_fileio_fstat. */ |
| 290 | |
| 291 | static int |
| 292 | inf_child_fileio_fstat (struct target_ops *self, int fd, |
| 293 | struct stat *sb, int *target_errno) |
| 294 | { |
| 295 | int ret; |
| 296 | |
| 297 | ret = fstat (fd, sb); |
| 298 | if (ret == -1) |
| 299 | *target_errno = host_to_fileio_error (errno); |
| 300 | |
| 301 | return ret; |
| 302 | } |
| 303 | |
| 304 | /* Implementation of to_fileio_close. */ |
| 305 | |
| 306 | static int |
| 307 | inf_child_fileio_close (struct target_ops *self, int fd, int *target_errno) |
| 308 | { |
| 309 | int ret; |
| 310 | |
| 311 | ret = close (fd); |
| 312 | if (ret == -1) |
| 313 | *target_errno = host_to_fileio_error (errno); |
| 314 | |
| 315 | return ret; |
| 316 | } |
| 317 | |
| 318 | /* Implementation of to_fileio_unlink. */ |
| 319 | |
| 320 | static int |
| 321 | inf_child_fileio_unlink (struct target_ops *self, |
| 322 | struct inferior *inf, const char *filename, |
| 323 | int *target_errno) |
| 324 | { |
| 325 | int ret; |
| 326 | |
| 327 | ret = unlink (filename); |
| 328 | if (ret == -1) |
| 329 | *target_errno = host_to_fileio_error (errno); |
| 330 | |
| 331 | return ret; |
| 332 | } |
| 333 | |
| 334 | /* Implementation of to_fileio_readlink. */ |
| 335 | |
| 336 | static char * |
| 337 | inf_child_fileio_readlink (struct target_ops *self, |
| 338 | struct inferior *inf, const char *filename, |
| 339 | int *target_errno) |
| 340 | { |
| 341 | /* We support readlink only on systems that also provide a compile-time |
| 342 | maximum path length (PATH_MAX), at least for now. */ |
| 343 | #if defined (PATH_MAX) |
| 344 | char buf[PATH_MAX]; |
| 345 | int len; |
| 346 | char *ret; |
| 347 | |
| 348 | len = readlink (filename, buf, sizeof buf); |
| 349 | if (len < 0) |
| 350 | { |
| 351 | *target_errno = host_to_fileio_error (errno); |
| 352 | return NULL; |
| 353 | } |
| 354 | |
| 355 | ret = xmalloc (len + 1); |
| 356 | memcpy (ret, buf, len); |
| 357 | ret[len] = '\0'; |
| 358 | return ret; |
| 359 | #else |
| 360 | *target_errno = FILEIO_ENOSYS; |
| 361 | return NULL; |
| 362 | #endif |
| 363 | } |
| 364 | |
| 365 | static int |
| 366 | inf_child_use_agent (struct target_ops *self, int use) |
| 367 | { |
| 368 | if (agent_loaded_p ()) |
| 369 | { |
| 370 | use_agent = use; |
| 371 | return 1; |
| 372 | } |
| 373 | else |
| 374 | return 0; |
| 375 | } |
| 376 | |
| 377 | static int |
| 378 | inf_child_can_use_agent (struct target_ops *self) |
| 379 | { |
| 380 | return agent_loaded_p (); |
| 381 | } |
| 382 | |
| 383 | /* Default implementation of the to_can_async_p and |
| 384 | to_supports_non_stop methods. */ |
| 385 | |
| 386 | static int |
| 387 | return_zero (struct target_ops *ignore) |
| 388 | { |
| 389 | return 0; |
| 390 | } |
| 391 | |
| 392 | struct target_ops * |
| 393 | inf_child_target (void) |
| 394 | { |
| 395 | struct target_ops *t = XCNEW (struct target_ops); |
| 396 | |
| 397 | t->to_shortname = "native"; |
| 398 | t->to_longname = "Native process"; |
| 399 | t->to_doc = "Native process (started by the \"run\" command)."; |
| 400 | t->to_open = inf_child_open; |
| 401 | t->to_close = inf_child_close; |
| 402 | t->to_disconnect = inf_child_disconnect; |
| 403 | t->to_post_attach = inf_child_post_attach; |
| 404 | t->to_fetch_registers = inf_child_fetch_inferior_registers; |
| 405 | t->to_store_registers = inf_child_store_inferior_registers; |
| 406 | t->to_prepare_to_store = inf_child_prepare_to_store; |
| 407 | t->to_insert_breakpoint = memory_insert_breakpoint; |
| 408 | t->to_remove_breakpoint = memory_remove_breakpoint; |
| 409 | t->to_terminal_init = child_terminal_init; |
| 410 | t->to_terminal_inferior = child_terminal_inferior; |
| 411 | t->to_terminal_ours_for_output = child_terminal_ours_for_output; |
| 412 | t->to_terminal_ours = child_terminal_ours; |
| 413 | t->to_terminal_info = child_terminal_info; |
| 414 | t->to_post_startup_inferior = inf_child_post_startup_inferior; |
| 415 | t->to_follow_fork = inf_child_follow_fork; |
| 416 | t->to_can_run = inf_child_can_run; |
| 417 | /* We must default these because they must be implemented by any |
| 418 | target that can run. */ |
| 419 | t->to_can_async_p = return_zero; |
| 420 | t->to_supports_non_stop = return_zero; |
| 421 | t->to_pid_to_exec_file = inf_child_pid_to_exec_file; |
| 422 | t->to_stratum = process_stratum; |
| 423 | t->to_has_all_memory = default_child_has_all_memory; |
| 424 | t->to_has_memory = default_child_has_memory; |
| 425 | t->to_has_stack = default_child_has_stack; |
| 426 | t->to_has_registers = default_child_has_registers; |
| 427 | t->to_has_execution = default_child_has_execution; |
| 428 | t->to_fileio_open = inf_child_fileio_open; |
| 429 | t->to_fileio_pwrite = inf_child_fileio_pwrite; |
| 430 | t->to_fileio_pread = inf_child_fileio_pread; |
| 431 | t->to_fileio_fstat = inf_child_fileio_fstat; |
| 432 | t->to_fileio_close = inf_child_fileio_close; |
| 433 | t->to_fileio_unlink = inf_child_fileio_unlink; |
| 434 | t->to_fileio_readlink = inf_child_fileio_readlink; |
| 435 | t->to_magic = OPS_MAGIC; |
| 436 | t->to_use_agent = inf_child_use_agent; |
| 437 | t->to_can_use_agent = inf_child_can_use_agent; |
| 438 | |
| 439 | /* Store a pointer so we can push the most-derived target from |
| 440 | inf_child_open. */ |
| 441 | inf_child_ops = t; |
| 442 | |
| 443 | return t; |
| 444 | } |