| 1 | /* Base/prototype target for default child (native) targets. |
| 2 | |
| 3 | Copyright (C) 1988-2020 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 "gdbsupport/fileio.h" |
| 34 | #include "gdbsupport/agent.h" |
| 35 | #include "gdbsupport/gdb_wait.h" |
| 36 | #include "gdbsupport/filestuff.h" |
| 37 | |
| 38 | #include <sys/types.h> |
| 39 | #include <fcntl.h> |
| 40 | #include <unistd.h> |
| 41 | |
| 42 | static const target_info inf_child_target_info = { |
| 43 | "native", |
| 44 | N_("Native process"), |
| 45 | N_("Native process (started by the \"run\" command).") |
| 46 | }; |
| 47 | |
| 48 | const target_info & |
| 49 | inf_child_target::info () const |
| 50 | { |
| 51 | return inf_child_target_info; |
| 52 | } |
| 53 | |
| 54 | /* Helper function for child_wait and the derivatives of child_wait. |
| 55 | HOSTSTATUS is the waitstatus from wait() or the equivalent; store our |
| 56 | translation of that in OURSTATUS. */ |
| 57 | void |
| 58 | store_waitstatus (struct target_waitstatus *ourstatus, int hoststatus) |
| 59 | { |
| 60 | if (WIFEXITED (hoststatus)) |
| 61 | { |
| 62 | ourstatus->kind = TARGET_WAITKIND_EXITED; |
| 63 | ourstatus->value.integer = WEXITSTATUS (hoststatus); |
| 64 | } |
| 65 | else if (!WIFSTOPPED (hoststatus)) |
| 66 | { |
| 67 | ourstatus->kind = TARGET_WAITKIND_SIGNALLED; |
| 68 | ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (hoststatus)); |
| 69 | } |
| 70 | else |
| 71 | { |
| 72 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| 73 | ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (hoststatus)); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | inf_child_target::~inf_child_target () |
| 78 | {} |
| 79 | |
| 80 | void |
| 81 | inf_child_target::post_attach (int pid) |
| 82 | { |
| 83 | /* This target doesn't require a meaningful "post attach" operation |
| 84 | by a debugger. */ |
| 85 | } |
| 86 | |
| 87 | /* Get ready to modify the registers array. On machines which store |
| 88 | individual registers, this doesn't need to do anything. On |
| 89 | machines which store all the registers in one fell swoop, this |
| 90 | makes sure that registers contains all the registers from the |
| 91 | program being debugged. */ |
| 92 | |
| 93 | void |
| 94 | inf_child_target::prepare_to_store (struct regcache *regcache) |
| 95 | { |
| 96 | } |
| 97 | |
| 98 | bool |
| 99 | inf_child_target::supports_terminal_ours () |
| 100 | { |
| 101 | return true; |
| 102 | } |
| 103 | |
| 104 | void |
| 105 | inf_child_target::terminal_init () |
| 106 | { |
| 107 | child_terminal_init (this); |
| 108 | } |
| 109 | |
| 110 | void |
| 111 | inf_child_target::terminal_inferior () |
| 112 | { |
| 113 | child_terminal_inferior (this); |
| 114 | } |
| 115 | |
| 116 | void |
| 117 | inf_child_target::terminal_save_inferior () |
| 118 | { |
| 119 | child_terminal_save_inferior (this); |
| 120 | } |
| 121 | |
| 122 | void |
| 123 | inf_child_target::terminal_ours_for_output () |
| 124 | { |
| 125 | child_terminal_ours_for_output (this); |
| 126 | } |
| 127 | |
| 128 | void |
| 129 | inf_child_target::terminal_ours () |
| 130 | { |
| 131 | child_terminal_ours (this); |
| 132 | } |
| 133 | |
| 134 | void |
| 135 | inf_child_target::interrupt () |
| 136 | { |
| 137 | child_interrupt (this); |
| 138 | } |
| 139 | |
| 140 | void |
| 141 | inf_child_target::pass_ctrlc () |
| 142 | { |
| 143 | child_pass_ctrlc (this); |
| 144 | } |
| 145 | |
| 146 | void |
| 147 | inf_child_target::terminal_info (const char *args, int from_tty) |
| 148 | { |
| 149 | child_terminal_info (this, args, from_tty); |
| 150 | } |
| 151 | |
| 152 | /* True if the user did "target native". In that case, we won't |
| 153 | unpush the child target automatically when the last inferior is |
| 154 | gone. */ |
| 155 | static int inf_child_explicitly_opened; |
| 156 | |
| 157 | /* See inf-child.h. */ |
| 158 | |
| 159 | void |
| 160 | inf_child_open_target (const char *arg, int from_tty) |
| 161 | { |
| 162 | target_ops *target = get_native_target (); |
| 163 | |
| 164 | /* There's always only ever one native target, and if we get here, |
| 165 | it better be an inf-child target. */ |
| 166 | gdb_assert (dynamic_cast<inf_child_target *> (target) != NULL); |
| 167 | |
| 168 | target_preopen (from_tty); |
| 169 | push_target (target); |
| 170 | inf_child_explicitly_opened = 1; |
| 171 | if (from_tty) |
| 172 | printf_filtered ("Done. Use the \"run\" command to start a process.\n"); |
| 173 | } |
| 174 | |
| 175 | /* Implement the to_disconnect target_ops method. */ |
| 176 | |
| 177 | void |
| 178 | inf_child_target::disconnect (const char *args, int from_tty) |
| 179 | { |
| 180 | if (args != NULL) |
| 181 | error (_("Argument given to \"disconnect\".")); |
| 182 | |
| 183 | /* This offers to detach/kill current inferiors, and then pops all |
| 184 | targets. */ |
| 185 | target_preopen (from_tty); |
| 186 | } |
| 187 | |
| 188 | /* Implement the to_close target_ops method. */ |
| 189 | |
| 190 | void |
| 191 | inf_child_target::close () |
| 192 | { |
| 193 | /* In case we were forcibly closed. */ |
| 194 | inf_child_explicitly_opened = 0; |
| 195 | } |
| 196 | |
| 197 | void |
| 198 | inf_child_target::mourn_inferior () |
| 199 | { |
| 200 | generic_mourn_inferior (); |
| 201 | maybe_unpush_target (); |
| 202 | } |
| 203 | |
| 204 | /* See inf-child.h. */ |
| 205 | |
| 206 | void |
| 207 | inf_child_target::maybe_unpush_target () |
| 208 | { |
| 209 | if (!inf_child_explicitly_opened && !have_inferiors ()) |
| 210 | unpush_target (this); |
| 211 | } |
| 212 | |
| 213 | void |
| 214 | inf_child_target::post_startup_inferior (ptid_t ptid) |
| 215 | { |
| 216 | /* This target doesn't require a meaningful "post startup inferior" |
| 217 | operation by a debugger. */ |
| 218 | } |
| 219 | |
| 220 | bool |
| 221 | inf_child_target::can_run () |
| 222 | { |
| 223 | return true; |
| 224 | } |
| 225 | |
| 226 | bool |
| 227 | inf_child_target::can_create_inferior () |
| 228 | { |
| 229 | return true; |
| 230 | } |
| 231 | |
| 232 | bool |
| 233 | inf_child_target::can_attach () |
| 234 | { |
| 235 | return true; |
| 236 | } |
| 237 | |
| 238 | char * |
| 239 | inf_child_target::pid_to_exec_file (int pid) |
| 240 | { |
| 241 | /* This target doesn't support translation of a process ID to the |
| 242 | filename of the executable file. */ |
| 243 | return NULL; |
| 244 | } |
| 245 | |
| 246 | /* Implementation of to_fileio_open. */ |
| 247 | |
| 248 | int |
| 249 | inf_child_target::fileio_open (struct inferior *inf, const char *filename, |
| 250 | int flags, int mode, int warn_if_slow, |
| 251 | int *target_errno) |
| 252 | { |
| 253 | int nat_flags; |
| 254 | mode_t nat_mode; |
| 255 | int fd; |
| 256 | |
| 257 | if (fileio_to_host_openflags (flags, &nat_flags) == -1 |
| 258 | || fileio_to_host_mode (mode, &nat_mode) == -1) |
| 259 | { |
| 260 | *target_errno = FILEIO_EINVAL; |
| 261 | return -1; |
| 262 | } |
| 263 | |
| 264 | fd = gdb_open_cloexec (filename, nat_flags, nat_mode); |
| 265 | if (fd == -1) |
| 266 | *target_errno = host_to_fileio_error (errno); |
| 267 | |
| 268 | return fd; |
| 269 | } |
| 270 | |
| 271 | /* Implementation of to_fileio_pwrite. */ |
| 272 | |
| 273 | int |
| 274 | inf_child_target::fileio_pwrite (int fd, const gdb_byte *write_buf, int len, |
| 275 | ULONGEST offset, int *target_errno) |
| 276 | { |
| 277 | int ret; |
| 278 | |
| 279 | #ifdef HAVE_PWRITE |
| 280 | ret = pwrite (fd, write_buf, len, (long) offset); |
| 281 | #else |
| 282 | ret = -1; |
| 283 | #endif |
| 284 | /* If we have no pwrite or it failed for this file, use lseek/write. */ |
| 285 | if (ret == -1) |
| 286 | { |
| 287 | ret = lseek (fd, (long) offset, SEEK_SET); |
| 288 | if (ret != -1) |
| 289 | ret = write (fd, write_buf, len); |
| 290 | } |
| 291 | |
| 292 | if (ret == -1) |
| 293 | *target_errno = host_to_fileio_error (errno); |
| 294 | |
| 295 | return ret; |
| 296 | } |
| 297 | |
| 298 | /* Implementation of to_fileio_pread. */ |
| 299 | |
| 300 | int |
| 301 | inf_child_target::fileio_pread (int fd, gdb_byte *read_buf, int len, |
| 302 | ULONGEST offset, int *target_errno) |
| 303 | { |
| 304 | int ret; |
| 305 | |
| 306 | #ifdef HAVE_PREAD |
| 307 | ret = pread (fd, read_buf, len, (long) offset); |
| 308 | #else |
| 309 | ret = -1; |
| 310 | #endif |
| 311 | /* If we have no pread or it failed for this file, use lseek/read. */ |
| 312 | if (ret == -1) |
| 313 | { |
| 314 | ret = lseek (fd, (long) offset, SEEK_SET); |
| 315 | if (ret != -1) |
| 316 | ret = read (fd, read_buf, len); |
| 317 | } |
| 318 | |
| 319 | if (ret == -1) |
| 320 | *target_errno = host_to_fileio_error (errno); |
| 321 | |
| 322 | return ret; |
| 323 | } |
| 324 | |
| 325 | /* Implementation of to_fileio_fstat. */ |
| 326 | |
| 327 | int |
| 328 | inf_child_target::fileio_fstat (int fd, struct stat *sb, int *target_errno) |
| 329 | { |
| 330 | int ret; |
| 331 | |
| 332 | ret = fstat (fd, sb); |
| 333 | if (ret == -1) |
| 334 | *target_errno = host_to_fileio_error (errno); |
| 335 | |
| 336 | return ret; |
| 337 | } |
| 338 | |
| 339 | /* Implementation of to_fileio_close. */ |
| 340 | |
| 341 | int |
| 342 | inf_child_target::fileio_close (int fd, int *target_errno) |
| 343 | { |
| 344 | int ret; |
| 345 | |
| 346 | ret = ::close (fd); |
| 347 | if (ret == -1) |
| 348 | *target_errno = host_to_fileio_error (errno); |
| 349 | |
| 350 | return ret; |
| 351 | } |
| 352 | |
| 353 | /* Implementation of to_fileio_unlink. */ |
| 354 | |
| 355 | int |
| 356 | inf_child_target::fileio_unlink (struct inferior *inf, const char *filename, |
| 357 | int *target_errno) |
| 358 | { |
| 359 | int ret; |
| 360 | |
| 361 | ret = unlink (filename); |
| 362 | if (ret == -1) |
| 363 | *target_errno = host_to_fileio_error (errno); |
| 364 | |
| 365 | return ret; |
| 366 | } |
| 367 | |
| 368 | /* Implementation of to_fileio_readlink. */ |
| 369 | |
| 370 | gdb::optional<std::string> |
| 371 | inf_child_target::fileio_readlink (struct inferior *inf, const char *filename, |
| 372 | int *target_errno) |
| 373 | { |
| 374 | /* We support readlink only on systems that also provide a compile-time |
| 375 | maximum path length (PATH_MAX), at least for now. */ |
| 376 | #if defined (PATH_MAX) |
| 377 | char buf[PATH_MAX]; |
| 378 | int len; |
| 379 | |
| 380 | len = readlink (filename, buf, sizeof buf); |
| 381 | if (len < 0) |
| 382 | { |
| 383 | *target_errno = host_to_fileio_error (errno); |
| 384 | return {}; |
| 385 | } |
| 386 | |
| 387 | return std::string (buf, len); |
| 388 | #else |
| 389 | *target_errno = FILEIO_ENOSYS; |
| 390 | return {}; |
| 391 | #endif |
| 392 | } |
| 393 | |
| 394 | bool |
| 395 | inf_child_target::use_agent (bool use) |
| 396 | { |
| 397 | if (agent_loaded_p ()) |
| 398 | { |
| 399 | ::use_agent = use; |
| 400 | return true; |
| 401 | } |
| 402 | else |
| 403 | return false; |
| 404 | } |
| 405 | |
| 406 | bool |
| 407 | inf_child_target::can_use_agent () |
| 408 | { |
| 409 | return agent_loaded_p (); |
| 410 | } |
| 411 | |
| 412 | /* See inf-child.h. */ |
| 413 | |
| 414 | void |
| 415 | add_inf_child_target (inf_child_target *target) |
| 416 | { |
| 417 | set_native_target (target); |
| 418 | add_target (inf_child_target_info, inf_child_open_target); |
| 419 | } |