| 1 | /* Target operations for the remote server for GDB. |
| 2 | Copyright (C) 2002-2020 Free Software Foundation, Inc. |
| 3 | |
| 4 | Contributed by MontaVista Software. |
| 5 | |
| 6 | This file is part of GDB. |
| 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 3 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, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "server.h" |
| 22 | #include "tracepoint.h" |
| 23 | #include "gdbsupport/byte-vector.h" |
| 24 | |
| 25 | process_stratum_target *the_target; |
| 26 | |
| 27 | int |
| 28 | set_desired_thread () |
| 29 | { |
| 30 | client_state &cs = get_client_state (); |
| 31 | thread_info *found = find_thread_ptid (cs.general_thread); |
| 32 | |
| 33 | current_thread = found; |
| 34 | return (current_thread != NULL); |
| 35 | } |
| 36 | |
| 37 | /* The thread that was current before prepare_to_access_memory was |
| 38 | called. done_accessing_memory uses this to restore the previous |
| 39 | selected thread. */ |
| 40 | static ptid_t prev_general_thread; |
| 41 | |
| 42 | /* See target.h. */ |
| 43 | |
| 44 | int |
| 45 | prepare_to_access_memory (void) |
| 46 | { |
| 47 | client_state &cs = get_client_state (); |
| 48 | |
| 49 | /* The first thread found. */ |
| 50 | struct thread_info *first = NULL; |
| 51 | /* The first stopped thread found. */ |
| 52 | struct thread_info *stopped = NULL; |
| 53 | /* The current general thread, if found. */ |
| 54 | struct thread_info *current = NULL; |
| 55 | |
| 56 | /* Save the general thread value, since prepare_to_access_memory could change |
| 57 | it. */ |
| 58 | prev_general_thread = cs.general_thread; |
| 59 | |
| 60 | int res = the_target->pt->prepare_to_access_memory (); |
| 61 | if (res != 0) |
| 62 | return res; |
| 63 | |
| 64 | for_each_thread (prev_general_thread.pid (), [&] (thread_info *thread) |
| 65 | { |
| 66 | if (mythread_alive (thread->id)) |
| 67 | { |
| 68 | if (stopped == NULL && the_target->thread_stopped != NULL |
| 69 | && thread_stopped (thread)) |
| 70 | stopped = thread; |
| 71 | |
| 72 | if (first == NULL) |
| 73 | first = thread; |
| 74 | |
| 75 | if (current == NULL && prev_general_thread == thread->id) |
| 76 | current = thread; |
| 77 | } |
| 78 | }); |
| 79 | |
| 80 | /* The thread we end up choosing. */ |
| 81 | struct thread_info *thread; |
| 82 | |
| 83 | /* Prefer a stopped thread. If none is found, try the current |
| 84 | thread. Otherwise, take the first thread in the process. If |
| 85 | none is found, undo the effects of |
| 86 | target->prepare_to_access_memory() and return error. */ |
| 87 | if (stopped != NULL) |
| 88 | thread = stopped; |
| 89 | else if (current != NULL) |
| 90 | thread = current; |
| 91 | else if (first != NULL) |
| 92 | thread = first; |
| 93 | else |
| 94 | { |
| 95 | done_accessing_memory (); |
| 96 | return 1; |
| 97 | } |
| 98 | |
| 99 | current_thread = thread; |
| 100 | cs.general_thread = ptid_of (thread); |
| 101 | |
| 102 | return 0; |
| 103 | } |
| 104 | |
| 105 | /* See target.h. */ |
| 106 | |
| 107 | void |
| 108 | done_accessing_memory (void) |
| 109 | { |
| 110 | client_state &cs = get_client_state (); |
| 111 | |
| 112 | the_target->pt->done_accessing_memory (); |
| 113 | |
| 114 | /* Restore the previous selected thread. */ |
| 115 | cs.general_thread = prev_general_thread; |
| 116 | switch_to_thread (the_target, cs.general_thread); |
| 117 | } |
| 118 | |
| 119 | int |
| 120 | read_inferior_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len) |
| 121 | { |
| 122 | int res; |
| 123 | res = the_target->pt->read_memory (memaddr, myaddr, len); |
| 124 | check_mem_read (memaddr, myaddr, len); |
| 125 | return res; |
| 126 | } |
| 127 | |
| 128 | /* See target/target.h. */ |
| 129 | |
| 130 | int |
| 131 | target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| 132 | { |
| 133 | return read_inferior_memory (memaddr, myaddr, len); |
| 134 | } |
| 135 | |
| 136 | /* See target/target.h. */ |
| 137 | |
| 138 | int |
| 139 | target_read_uint32 (CORE_ADDR memaddr, uint32_t *result) |
| 140 | { |
| 141 | return read_inferior_memory (memaddr, (gdb_byte *) result, sizeof (*result)); |
| 142 | } |
| 143 | |
| 144 | /* See target/target.h. */ |
| 145 | |
| 146 | int |
| 147 | target_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, |
| 148 | ssize_t len) |
| 149 | { |
| 150 | /* Make a copy of the data because check_mem_write may need to |
| 151 | update it. */ |
| 152 | gdb::byte_vector buffer (myaddr, myaddr + len); |
| 153 | check_mem_write (memaddr, buffer.data (), myaddr, len); |
| 154 | return the_target->pt->write_memory (memaddr, buffer.data (), len); |
| 155 | } |
| 156 | |
| 157 | ptid_t |
| 158 | mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options, |
| 159 | int connected_wait) |
| 160 | { |
| 161 | ptid_t ret; |
| 162 | |
| 163 | if (connected_wait) |
| 164 | server_waiting = 1; |
| 165 | |
| 166 | ret = target_wait (ptid, ourstatus, options); |
| 167 | |
| 168 | /* We don't expose _LOADED events to gdbserver core. See the |
| 169 | `dlls_changed' global. */ |
| 170 | if (ourstatus->kind == TARGET_WAITKIND_LOADED) |
| 171 | ourstatus->kind = TARGET_WAITKIND_STOPPED; |
| 172 | |
| 173 | /* If GDB is connected through TCP/serial, then GDBserver will most |
| 174 | probably be running on its own terminal/console, so it's nice to |
| 175 | print there why is GDBserver exiting. If however, GDB is |
| 176 | connected through stdio, then there's no need to spam the GDB |
| 177 | console with this -- the user will already see the exit through |
| 178 | regular GDB output, in that same terminal. */ |
| 179 | if (!remote_connection_is_stdio ()) |
| 180 | { |
| 181 | if (ourstatus->kind == TARGET_WAITKIND_EXITED) |
| 182 | fprintf (stderr, |
| 183 | "\nChild exited with status %d\n", ourstatus->value.integer); |
| 184 | else if (ourstatus->kind == TARGET_WAITKIND_SIGNALLED) |
| 185 | fprintf (stderr, "\nChild terminated with signal = 0x%x (%s)\n", |
| 186 | gdb_signal_to_host (ourstatus->value.sig), |
| 187 | gdb_signal_to_name (ourstatus->value.sig)); |
| 188 | } |
| 189 | |
| 190 | if (connected_wait) |
| 191 | server_waiting = 0; |
| 192 | |
| 193 | return ret; |
| 194 | } |
| 195 | |
| 196 | /* See target/target.h. */ |
| 197 | |
| 198 | void |
| 199 | target_stop_and_wait (ptid_t ptid) |
| 200 | { |
| 201 | struct target_waitstatus status; |
| 202 | bool was_non_stop = non_stop; |
| 203 | struct thread_resume resume_info; |
| 204 | |
| 205 | resume_info.thread = ptid; |
| 206 | resume_info.kind = resume_stop; |
| 207 | resume_info.sig = GDB_SIGNAL_0; |
| 208 | the_target->pt->resume (&resume_info, 1); |
| 209 | |
| 210 | non_stop = true; |
| 211 | mywait (ptid, &status, 0, 0); |
| 212 | non_stop = was_non_stop; |
| 213 | } |
| 214 | |
| 215 | /* See target/target.h. */ |
| 216 | |
| 217 | ptid_t |
| 218 | target_wait (ptid_t ptid, struct target_waitstatus *status, int options) |
| 219 | { |
| 220 | return the_target->pt->wait (ptid, status, options); |
| 221 | } |
| 222 | |
| 223 | /* See target/target.h. */ |
| 224 | |
| 225 | void |
| 226 | target_mourn_inferior (ptid_t ptid) |
| 227 | { |
| 228 | the_target->pt->mourn (find_process_pid (ptid.pid ())); |
| 229 | } |
| 230 | |
| 231 | /* See target/target.h. */ |
| 232 | |
| 233 | void |
| 234 | target_continue_no_signal (ptid_t ptid) |
| 235 | { |
| 236 | struct thread_resume resume_info; |
| 237 | |
| 238 | resume_info.thread = ptid; |
| 239 | resume_info.kind = resume_continue; |
| 240 | resume_info.sig = GDB_SIGNAL_0; |
| 241 | the_target->pt->resume (&resume_info, 1); |
| 242 | } |
| 243 | |
| 244 | /* See target/target.h. */ |
| 245 | |
| 246 | void |
| 247 | target_continue (ptid_t ptid, enum gdb_signal signal) |
| 248 | { |
| 249 | struct thread_resume resume_info; |
| 250 | |
| 251 | resume_info.thread = ptid; |
| 252 | resume_info.kind = resume_continue; |
| 253 | resume_info.sig = gdb_signal_to_host (signal); |
| 254 | the_target->pt->resume (&resume_info, 1); |
| 255 | } |
| 256 | |
| 257 | /* See target/target.h. */ |
| 258 | |
| 259 | int |
| 260 | target_supports_multi_process (void) |
| 261 | { |
| 262 | return (the_target->supports_multi_process != NULL ? |
| 263 | (*the_target->supports_multi_process) () : 0); |
| 264 | } |
| 265 | |
| 266 | int |
| 267 | start_non_stop (int nonstop) |
| 268 | { |
| 269 | if (the_target->start_non_stop == NULL) |
| 270 | { |
| 271 | if (nonstop) |
| 272 | return -1; |
| 273 | else |
| 274 | return 0; |
| 275 | } |
| 276 | |
| 277 | return (*the_target->start_non_stop) (nonstop); |
| 278 | } |
| 279 | |
| 280 | void |
| 281 | set_target_ops (process_stratum_target *target) |
| 282 | { |
| 283 | the_target = XNEW (process_stratum_target); |
| 284 | memcpy (the_target, target, sizeof (*the_target)); |
| 285 | } |
| 286 | |
| 287 | /* Convert pid to printable format. */ |
| 288 | |
| 289 | const char * |
| 290 | target_pid_to_str (ptid_t ptid) |
| 291 | { |
| 292 | static char buf[80]; |
| 293 | |
| 294 | if (ptid == minus_one_ptid) |
| 295 | xsnprintf (buf, sizeof (buf), "<all threads>"); |
| 296 | else if (ptid == null_ptid) |
| 297 | xsnprintf (buf, sizeof (buf), "<null thread>"); |
| 298 | else if (ptid.tid () != 0) |
| 299 | xsnprintf (buf, sizeof (buf), "Thread %d.0x%lx", |
| 300 | ptid.pid (), ptid.tid ()); |
| 301 | else if (ptid.lwp () != 0) |
| 302 | xsnprintf (buf, sizeof (buf), "LWP %d.%ld", |
| 303 | ptid.pid (), ptid.lwp ()); |
| 304 | else |
| 305 | xsnprintf (buf, sizeof (buf), "Process %d", |
| 306 | ptid.pid ()); |
| 307 | |
| 308 | return buf; |
| 309 | } |
| 310 | |
| 311 | int |
| 312 | kill_inferior (process_info *proc) |
| 313 | { |
| 314 | gdb_agent_about_to_close (proc->pid); |
| 315 | |
| 316 | return the_target->pt->kill (proc); |
| 317 | } |
| 318 | |
| 319 | /* Default implementation for breakpoint_kind_for_pc. |
| 320 | |
| 321 | The default behavior for targets that don't implement breakpoint_kind_for_pc |
| 322 | is to use the size of a breakpoint as the kind. */ |
| 323 | |
| 324 | int |
| 325 | default_breakpoint_kind_from_pc (CORE_ADDR *pcptr) |
| 326 | { |
| 327 | int size = 0; |
| 328 | |
| 329 | gdb_assert (the_target->sw_breakpoint_from_kind != NULL); |
| 330 | |
| 331 | (*the_target->sw_breakpoint_from_kind) (0, &size); |
| 332 | return size; |
| 333 | } |
| 334 | |
| 335 | /* Define it. */ |
| 336 | |
| 337 | target_terminal_state target_terminal::m_terminal_state |
| 338 | = target_terminal_state::is_ours; |
| 339 | |
| 340 | /* See target/target.h. */ |
| 341 | |
| 342 | void |
| 343 | target_terminal::init () |
| 344 | { |
| 345 | /* Placeholder needed because of fork_inferior. Not necessary on |
| 346 | GDBserver. */ |
| 347 | } |
| 348 | |
| 349 | /* See target/target.h. */ |
| 350 | |
| 351 | void |
| 352 | target_terminal::inferior () |
| 353 | { |
| 354 | /* Placeholder needed because of fork_inferior. Not necessary on |
| 355 | GDBserver. */ |
| 356 | } |
| 357 | |
| 358 | /* See target/target.h. */ |
| 359 | |
| 360 | void |
| 361 | target_terminal::ours () |
| 362 | { |
| 363 | /* Placeholder needed because of fork_inferior. Not necessary on |
| 364 | GDBserver. */ |
| 365 | } |
| 366 | |
| 367 | /* See target/target.h. */ |
| 368 | |
| 369 | void |
| 370 | target_terminal::ours_for_output (void) |
| 371 | { |
| 372 | /* Placeholder. */ |
| 373 | } |
| 374 | |
| 375 | /* See target/target.h. */ |
| 376 | |
| 377 | void |
| 378 | target_terminal::info (const char *arg, int from_tty) |
| 379 | { |
| 380 | /* Placeholder. */ |
| 381 | } |
| 382 | |
| 383 | /* Default implementations of target ops. |
| 384 | See target.h for definitions. */ |
| 385 | |
| 386 | void |
| 387 | process_target::post_create_inferior () |
| 388 | { |
| 389 | /* Nop. */ |
| 390 | } |
| 391 | |
| 392 | int |
| 393 | process_target::prepare_to_access_memory () |
| 394 | { |
| 395 | return 0; |
| 396 | } |
| 397 | |
| 398 | void |
| 399 | process_target::done_accessing_memory () |
| 400 | { |
| 401 | /* Nop. */ |
| 402 | } |
| 403 | |
| 404 | void |
| 405 | process_target::look_up_symbols () |
| 406 | { |
| 407 | /* Nop. */ |
| 408 | } |
| 409 | |
| 410 | bool |
| 411 | process_target::supports_read_auxv () |
| 412 | { |
| 413 | return false; |
| 414 | } |
| 415 | |
| 416 | int |
| 417 | process_target::read_auxv (CORE_ADDR offset, unsigned char *myaddr, |
| 418 | unsigned int len) |
| 419 | { |
| 420 | gdb_assert_not_reached ("target op read_auxv not supported"); |
| 421 | } |
| 422 | |
| 423 | bool |
| 424 | process_target::supports_z_point_type (char z_type) |
| 425 | { |
| 426 | return false; |
| 427 | } |
| 428 | |
| 429 | int |
| 430 | process_target::insert_point (enum raw_bkpt_type type, CORE_ADDR addr, |
| 431 | int size, raw_breakpoint *bp) |
| 432 | { |
| 433 | return 1; |
| 434 | } |
| 435 | |
| 436 | int |
| 437 | process_target::remove_point (enum raw_bkpt_type type, CORE_ADDR addr, |
| 438 | int size, raw_breakpoint *bp) |
| 439 | { |
| 440 | return 1; |
| 441 | } |
| 442 | |
| 443 | bool |
| 444 | process_target::stopped_by_sw_breakpoint () |
| 445 | { |
| 446 | return false; |
| 447 | } |
| 448 | |
| 449 | bool |
| 450 | process_target::supports_stopped_by_sw_breakpoint () |
| 451 | { |
| 452 | return false; |
| 453 | } |
| 454 | |
| 455 | bool |
| 456 | process_target::stopped_by_hw_breakpoint () |
| 457 | { |
| 458 | return false; |
| 459 | } |
| 460 | |
| 461 | bool |
| 462 | process_target::supports_stopped_by_hw_breakpoint () |
| 463 | { |
| 464 | return false; |
| 465 | } |
| 466 | |
| 467 | bool |
| 468 | process_target::supports_hardware_single_step () |
| 469 | { |
| 470 | return false; |
| 471 | } |
| 472 | |
| 473 | bool |
| 474 | process_target::stopped_by_watchpoint () |
| 475 | { |
| 476 | return false; |
| 477 | } |
| 478 | |
| 479 | CORE_ADDR |
| 480 | process_target::stopped_data_address () |
| 481 | { |
| 482 | return 0; |
| 483 | } |
| 484 | |
| 485 | bool |
| 486 | process_target::supports_read_offsets () |
| 487 | { |
| 488 | return false; |
| 489 | } |
| 490 | |
| 491 | int |
| 492 | process_target::read_offsets (CORE_ADDR *text, CORE_ADDR *data) |
| 493 | { |
| 494 | gdb_assert_not_reached ("target op read_offsets not supported"); |
| 495 | } |