| 1 | /* Select target systems and architectures at runtime for GDB. |
| 2 | |
| 3 | Copyright (C) 1990-2018 Free Software Foundation, Inc. |
| 4 | |
| 5 | Contributed by Cygnus Support. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 3 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 21 | |
| 22 | #include "defs.h" |
| 23 | #include "target.h" |
| 24 | #include "target-dcache.h" |
| 25 | #include "gdbcmd.h" |
| 26 | #include "symtab.h" |
| 27 | #include "inferior.h" |
| 28 | #include "infrun.h" |
| 29 | #include "bfd.h" |
| 30 | #include "symfile.h" |
| 31 | #include "objfiles.h" |
| 32 | #include "dcache.h" |
| 33 | #include <signal.h> |
| 34 | #include "regcache.h" |
| 35 | #include "gdbcore.h" |
| 36 | #include "target-descriptions.h" |
| 37 | #include "gdbthread.h" |
| 38 | #include "solib.h" |
| 39 | #include "exec.h" |
| 40 | #include "inline-frame.h" |
| 41 | #include "tracepoint.h" |
| 42 | #include "gdb/fileio.h" |
| 43 | #include "agent.h" |
| 44 | #include "auxv.h" |
| 45 | #include "target-debug.h" |
| 46 | #include "top.h" |
| 47 | #include "event-top.h" |
| 48 | #include <algorithm> |
| 49 | #include "byte-vector.h" |
| 50 | #include "terminal.h" |
| 51 | #include <algorithm> |
| 52 | #include <unordered_map> |
| 53 | |
| 54 | static void generic_tls_error (void) ATTRIBUTE_NORETURN; |
| 55 | |
| 56 | static void default_terminal_info (struct target_ops *, const char *, int); |
| 57 | |
| 58 | static int default_watchpoint_addr_within_range (struct target_ops *, |
| 59 | CORE_ADDR, CORE_ADDR, int); |
| 60 | |
| 61 | static int default_region_ok_for_hw_watchpoint (struct target_ops *, |
| 62 | CORE_ADDR, int); |
| 63 | |
| 64 | static void default_rcmd (struct target_ops *, const char *, struct ui_file *); |
| 65 | |
| 66 | static ptid_t default_get_ada_task_ptid (struct target_ops *self, |
| 67 | long lwp, long tid); |
| 68 | |
| 69 | static int default_follow_fork (struct target_ops *self, int follow_child, |
| 70 | int detach_fork); |
| 71 | |
| 72 | static void default_mourn_inferior (struct target_ops *self); |
| 73 | |
| 74 | static int default_search_memory (struct target_ops *ops, |
| 75 | CORE_ADDR start_addr, |
| 76 | ULONGEST search_space_len, |
| 77 | const gdb_byte *pattern, |
| 78 | ULONGEST pattern_len, |
| 79 | CORE_ADDR *found_addrp); |
| 80 | |
| 81 | static int default_verify_memory (struct target_ops *self, |
| 82 | const gdb_byte *data, |
| 83 | CORE_ADDR memaddr, ULONGEST size); |
| 84 | |
| 85 | static void tcomplain (void) ATTRIBUTE_NORETURN; |
| 86 | |
| 87 | static struct target_ops *find_default_run_target (const char *); |
| 88 | |
| 89 | static int dummy_find_memory_regions (struct target_ops *self, |
| 90 | find_memory_region_ftype ignore1, |
| 91 | void *ignore2); |
| 92 | |
| 93 | static char *dummy_make_corefile_notes (struct target_ops *self, |
| 94 | bfd *ignore1, int *ignore2); |
| 95 | |
| 96 | static const char *default_pid_to_str (struct target_ops *ops, ptid_t ptid); |
| 97 | |
| 98 | static enum exec_direction_kind default_execution_direction |
| 99 | (struct target_ops *self); |
| 100 | |
| 101 | /* Mapping between target_info objects (which have address identity) |
| 102 | and corresponding open/factory function/callback. Each add_target |
| 103 | call adds one entry to this map, and registers a "target |
| 104 | TARGET_NAME" command that when invoked calls the factory registered |
| 105 | here. The target_info object is associated with the command via |
| 106 | the command's context. */ |
| 107 | static std::unordered_map<const target_info *, target_open_ftype *> |
| 108 | target_factories; |
| 109 | |
| 110 | /* The initial current target, so that there is always a semi-valid |
| 111 | current target. */ |
| 112 | |
| 113 | static struct target_ops *the_dummy_target; |
| 114 | static struct target_ops *the_debug_target; |
| 115 | |
| 116 | /* The target stack. */ |
| 117 | |
| 118 | static target_stack g_target_stack; |
| 119 | |
| 120 | /* Top of target stack. */ |
| 121 | /* The target structure we are currently using to talk to a process |
| 122 | or file or whatever "inferior" we have. */ |
| 123 | |
| 124 | target_ops * |
| 125 | current_top_target () |
| 126 | { |
| 127 | return g_target_stack.top (); |
| 128 | } |
| 129 | |
| 130 | /* Command list for target. */ |
| 131 | |
| 132 | static struct cmd_list_element *targetlist = NULL; |
| 133 | |
| 134 | /* Nonzero if we should trust readonly sections from the |
| 135 | executable when reading memory. */ |
| 136 | |
| 137 | static int trust_readonly = 0; |
| 138 | |
| 139 | /* Nonzero if we should show true memory content including |
| 140 | memory breakpoint inserted by gdb. */ |
| 141 | |
| 142 | static int show_memory_breakpoints = 0; |
| 143 | |
| 144 | /* These globals control whether GDB attempts to perform these |
| 145 | operations; they are useful for targets that need to prevent |
| 146 | inadvertant disruption, such as in non-stop mode. */ |
| 147 | |
| 148 | int may_write_registers = 1; |
| 149 | |
| 150 | int may_write_memory = 1; |
| 151 | |
| 152 | int may_insert_breakpoints = 1; |
| 153 | |
| 154 | int may_insert_tracepoints = 1; |
| 155 | |
| 156 | int may_insert_fast_tracepoints = 1; |
| 157 | |
| 158 | int may_stop = 1; |
| 159 | |
| 160 | /* Non-zero if we want to see trace of target level stuff. */ |
| 161 | |
| 162 | static unsigned int targetdebug = 0; |
| 163 | |
| 164 | static void |
| 165 | set_targetdebug (const char *args, int from_tty, struct cmd_list_element *c) |
| 166 | { |
| 167 | if (targetdebug) |
| 168 | push_target (the_debug_target); |
| 169 | else |
| 170 | unpush_target (the_debug_target); |
| 171 | } |
| 172 | |
| 173 | static void |
| 174 | show_targetdebug (struct ui_file *file, int from_tty, |
| 175 | struct cmd_list_element *c, const char *value) |
| 176 | { |
| 177 | fprintf_filtered (file, _("Target debugging is %s.\n"), value); |
| 178 | } |
| 179 | |
| 180 | /* The user just typed 'target' without the name of a target. */ |
| 181 | |
| 182 | static void |
| 183 | target_command (const char *arg, int from_tty) |
| 184 | { |
| 185 | fputs_filtered ("Argument required (target name). Try `help target'\n", |
| 186 | gdb_stdout); |
| 187 | } |
| 188 | |
| 189 | int |
| 190 | target_has_all_memory_1 (void) |
| 191 | { |
| 192 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 193 | if (t->has_all_memory ()) |
| 194 | return 1; |
| 195 | |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | int |
| 200 | target_has_memory_1 (void) |
| 201 | { |
| 202 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 203 | if (t->has_memory ()) |
| 204 | return 1; |
| 205 | |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | int |
| 210 | target_has_stack_1 (void) |
| 211 | { |
| 212 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 213 | if (t->has_stack ()) |
| 214 | return 1; |
| 215 | |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | int |
| 220 | target_has_registers_1 (void) |
| 221 | { |
| 222 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 223 | if (t->has_registers ()) |
| 224 | return 1; |
| 225 | |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | int |
| 230 | target_has_execution_1 (ptid_t the_ptid) |
| 231 | { |
| 232 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 233 | if (t->has_execution (the_ptid)) |
| 234 | return 1; |
| 235 | |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | int |
| 240 | target_has_execution_current (void) |
| 241 | { |
| 242 | return target_has_execution_1 (inferior_ptid); |
| 243 | } |
| 244 | |
| 245 | /* This is used to implement the various target commands. */ |
| 246 | |
| 247 | static void |
| 248 | open_target (const char *args, int from_tty, struct cmd_list_element *command) |
| 249 | { |
| 250 | auto *ti = static_cast<target_info *> (get_cmd_context (command)); |
| 251 | target_open_ftype *func = target_factories[ti]; |
| 252 | |
| 253 | if (targetdebug) |
| 254 | fprintf_unfiltered (gdb_stdlog, "-> %s->open (...)\n", |
| 255 | ti->shortname); |
| 256 | |
| 257 | func (args, from_tty); |
| 258 | |
| 259 | if (targetdebug) |
| 260 | fprintf_unfiltered (gdb_stdlog, "<- %s->open (%s, %d)\n", |
| 261 | ti->shortname, args, from_tty); |
| 262 | } |
| 263 | |
| 264 | /* See target.h. */ |
| 265 | |
| 266 | void |
| 267 | add_target (const target_info &t, target_open_ftype *func, |
| 268 | completer_ftype *completer) |
| 269 | { |
| 270 | struct cmd_list_element *c; |
| 271 | |
| 272 | auto &func_slot = target_factories[&t]; |
| 273 | if (func_slot != nullptr) |
| 274 | internal_error (__FILE__, __LINE__, |
| 275 | _("target already added (\"%s\")."), t.shortname); |
| 276 | func_slot = func; |
| 277 | |
| 278 | if (targetlist == NULL) |
| 279 | add_prefix_cmd ("target", class_run, target_command, _("\ |
| 280 | Connect to a target machine or process.\n\ |
| 281 | The first argument is the type or protocol of the target machine.\n\ |
| 282 | Remaining arguments are interpreted by the target protocol. For more\n\ |
| 283 | information on the arguments for a particular protocol, type\n\ |
| 284 | `help target ' followed by the protocol name."), |
| 285 | &targetlist, "target ", 0, &cmdlist); |
| 286 | c = add_cmd (t.shortname, no_class, t.doc, &targetlist); |
| 287 | set_cmd_context (c, (void *) &t); |
| 288 | set_cmd_sfunc (c, open_target); |
| 289 | if (completer != NULL) |
| 290 | set_cmd_completer (c, completer); |
| 291 | } |
| 292 | |
| 293 | /* See target.h. */ |
| 294 | |
| 295 | void |
| 296 | add_deprecated_target_alias (const target_info &tinfo, const char *alias) |
| 297 | { |
| 298 | struct cmd_list_element *c; |
| 299 | char *alt; |
| 300 | |
| 301 | /* If we use add_alias_cmd, here, we do not get the deprecated warning, |
| 302 | see PR cli/15104. */ |
| 303 | c = add_cmd (alias, no_class, tinfo.doc, &targetlist); |
| 304 | set_cmd_sfunc (c, open_target); |
| 305 | set_cmd_context (c, (void *) &tinfo); |
| 306 | alt = xstrprintf ("target %s", tinfo.shortname); |
| 307 | deprecate_cmd (c, alt); |
| 308 | } |
| 309 | |
| 310 | /* Stub functions */ |
| 311 | |
| 312 | void |
| 313 | target_kill (void) |
| 314 | { |
| 315 | current_top_target ()->kill (); |
| 316 | } |
| 317 | |
| 318 | void |
| 319 | target_load (const char *arg, int from_tty) |
| 320 | { |
| 321 | target_dcache_invalidate (); |
| 322 | current_top_target ()->load (arg, from_tty); |
| 323 | } |
| 324 | |
| 325 | /* Define it. */ |
| 326 | |
| 327 | target_terminal_state target_terminal::m_terminal_state |
| 328 | = target_terminal_state::is_ours; |
| 329 | |
| 330 | /* See target/target.h. */ |
| 331 | |
| 332 | void |
| 333 | target_terminal::init (void) |
| 334 | { |
| 335 | current_top_target ()->terminal_init (); |
| 336 | |
| 337 | m_terminal_state = target_terminal_state::is_ours; |
| 338 | } |
| 339 | |
| 340 | /* See target/target.h. */ |
| 341 | |
| 342 | void |
| 343 | target_terminal::inferior (void) |
| 344 | { |
| 345 | struct ui *ui = current_ui; |
| 346 | |
| 347 | /* A background resume (``run&'') should leave GDB in control of the |
| 348 | terminal. */ |
| 349 | if (ui->prompt_state != PROMPT_BLOCKED) |
| 350 | return; |
| 351 | |
| 352 | /* Since we always run the inferior in the main console (unless "set |
| 353 | inferior-tty" is in effect), when some UI other than the main one |
| 354 | calls target_terminal::inferior, then we leave the main UI's |
| 355 | terminal settings as is. */ |
| 356 | if (ui != main_ui) |
| 357 | return; |
| 358 | |
| 359 | /* If GDB is resuming the inferior in the foreground, install |
| 360 | inferior's terminal modes. */ |
| 361 | |
| 362 | struct inferior *inf = current_inferior (); |
| 363 | |
| 364 | if (inf->terminal_state != target_terminal_state::is_inferior) |
| 365 | { |
| 366 | current_top_target ()->terminal_inferior (); |
| 367 | inf->terminal_state = target_terminal_state::is_inferior; |
| 368 | } |
| 369 | |
| 370 | m_terminal_state = target_terminal_state::is_inferior; |
| 371 | |
| 372 | /* If the user hit C-c before, pretend that it was hit right |
| 373 | here. */ |
| 374 | if (check_quit_flag ()) |
| 375 | target_pass_ctrlc (); |
| 376 | } |
| 377 | |
| 378 | /* See target/target.h. */ |
| 379 | |
| 380 | void |
| 381 | target_terminal::restore_inferior (void) |
| 382 | { |
| 383 | struct ui *ui = current_ui; |
| 384 | |
| 385 | /* See target_terminal::inferior(). */ |
| 386 | if (ui->prompt_state != PROMPT_BLOCKED || ui != main_ui) |
| 387 | return; |
| 388 | |
| 389 | /* Restore the terminal settings of inferiors that were in the |
| 390 | foreground but are now ours_for_output due to a temporary |
| 391 | target_target::ours_for_output() call. */ |
| 392 | |
| 393 | { |
| 394 | scoped_restore_current_inferior restore_inferior; |
| 395 | |
| 396 | for (struct inferior *inf : all_inferiors ()) |
| 397 | { |
| 398 | if (inf->terminal_state == target_terminal_state::is_ours_for_output) |
| 399 | { |
| 400 | set_current_inferior (inf); |
| 401 | current_top_target ()->terminal_inferior (); |
| 402 | inf->terminal_state = target_terminal_state::is_inferior; |
| 403 | } |
| 404 | } |
| 405 | } |
| 406 | |
| 407 | m_terminal_state = target_terminal_state::is_inferior; |
| 408 | |
| 409 | /* If the user hit C-c before, pretend that it was hit right |
| 410 | here. */ |
| 411 | if (check_quit_flag ()) |
| 412 | target_pass_ctrlc (); |
| 413 | } |
| 414 | |
| 415 | /* Switch terminal state to DESIRED_STATE, either is_ours, or |
| 416 | is_ours_for_output. */ |
| 417 | |
| 418 | static void |
| 419 | target_terminal_is_ours_kind (target_terminal_state desired_state) |
| 420 | { |
| 421 | scoped_restore_current_inferior restore_inferior; |
| 422 | |
| 423 | /* Must do this in two passes. First, have all inferiors save the |
| 424 | current terminal settings. Then, after all inferiors have add a |
| 425 | chance to safely save the terminal settings, restore GDB's |
| 426 | terminal settings. */ |
| 427 | |
| 428 | for (inferior *inf : all_inferiors ()) |
| 429 | { |
| 430 | if (inf->terminal_state == target_terminal_state::is_inferior) |
| 431 | { |
| 432 | set_current_inferior (inf); |
| 433 | current_top_target ()->terminal_save_inferior (); |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | for (inferior *inf : all_inferiors ()) |
| 438 | { |
| 439 | /* Note we don't check is_inferior here like above because we |
| 440 | need to handle 'is_ours_for_output -> is_ours' too. Careful |
| 441 | to never transition from 'is_ours' to 'is_ours_for_output', |
| 442 | though. */ |
| 443 | if (inf->terminal_state != target_terminal_state::is_ours |
| 444 | && inf->terminal_state != desired_state) |
| 445 | { |
| 446 | set_current_inferior (inf); |
| 447 | if (desired_state == target_terminal_state::is_ours) |
| 448 | current_top_target ()->terminal_ours (); |
| 449 | else if (desired_state == target_terminal_state::is_ours_for_output) |
| 450 | current_top_target ()->terminal_ours_for_output (); |
| 451 | else |
| 452 | gdb_assert_not_reached ("unhandled desired state"); |
| 453 | inf->terminal_state = desired_state; |
| 454 | } |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | /* See target/target.h. */ |
| 459 | |
| 460 | void |
| 461 | target_terminal::ours () |
| 462 | { |
| 463 | struct ui *ui = current_ui; |
| 464 | |
| 465 | /* See target_terminal::inferior. */ |
| 466 | if (ui != main_ui) |
| 467 | return; |
| 468 | |
| 469 | if (m_terminal_state == target_terminal_state::is_ours) |
| 470 | return; |
| 471 | |
| 472 | target_terminal_is_ours_kind (target_terminal_state::is_ours); |
| 473 | m_terminal_state = target_terminal_state::is_ours; |
| 474 | } |
| 475 | |
| 476 | /* See target/target.h. */ |
| 477 | |
| 478 | void |
| 479 | target_terminal::ours_for_output () |
| 480 | { |
| 481 | struct ui *ui = current_ui; |
| 482 | |
| 483 | /* See target_terminal::inferior. */ |
| 484 | if (ui != main_ui) |
| 485 | return; |
| 486 | |
| 487 | if (!target_terminal::is_inferior ()) |
| 488 | return; |
| 489 | |
| 490 | target_terminal_is_ours_kind (target_terminal_state::is_ours_for_output); |
| 491 | target_terminal::m_terminal_state = target_terminal_state::is_ours_for_output; |
| 492 | } |
| 493 | |
| 494 | /* See target/target.h. */ |
| 495 | |
| 496 | void |
| 497 | target_terminal::info (const char *arg, int from_tty) |
| 498 | { |
| 499 | current_top_target ()->terminal_info (arg, from_tty); |
| 500 | } |
| 501 | |
| 502 | /* See target.h. */ |
| 503 | |
| 504 | bool |
| 505 | target_supports_terminal_ours (void) |
| 506 | { |
| 507 | /* This can be called before there is any target, so we must check |
| 508 | for nullptr here. */ |
| 509 | target_ops *top = current_top_target (); |
| 510 | |
| 511 | if (top == nullptr) |
| 512 | return false; |
| 513 | return top->supports_terminal_ours (); |
| 514 | } |
| 515 | |
| 516 | static void |
| 517 | tcomplain (void) |
| 518 | { |
| 519 | error (_("You can't do that when your target is `%s'"), |
| 520 | current_top_target ()->shortname ()); |
| 521 | } |
| 522 | |
| 523 | void |
| 524 | noprocess (void) |
| 525 | { |
| 526 | error (_("You can't do that without a process to debug.")); |
| 527 | } |
| 528 | |
| 529 | static void |
| 530 | default_terminal_info (struct target_ops *self, const char *args, int from_tty) |
| 531 | { |
| 532 | printf_unfiltered (_("No saved terminal information.\n")); |
| 533 | } |
| 534 | |
| 535 | /* A default implementation for the to_get_ada_task_ptid target method. |
| 536 | |
| 537 | This function builds the PTID by using both LWP and TID as part of |
| 538 | the PTID lwp and tid elements. The pid used is the pid of the |
| 539 | inferior_ptid. */ |
| 540 | |
| 541 | static ptid_t |
| 542 | default_get_ada_task_ptid (struct target_ops *self, long lwp, long tid) |
| 543 | { |
| 544 | return ptid_t (inferior_ptid.pid (), lwp, tid); |
| 545 | } |
| 546 | |
| 547 | static enum exec_direction_kind |
| 548 | default_execution_direction (struct target_ops *self) |
| 549 | { |
| 550 | if (!target_can_execute_reverse) |
| 551 | return EXEC_FORWARD; |
| 552 | else if (!target_can_async_p ()) |
| 553 | return EXEC_FORWARD; |
| 554 | else |
| 555 | gdb_assert_not_reached ("\ |
| 556 | to_execution_direction must be implemented for reverse async"); |
| 557 | } |
| 558 | |
| 559 | /* See target.h. */ |
| 560 | |
| 561 | void |
| 562 | target_stack::push (target_ops *t) |
| 563 | { |
| 564 | /* If there's already a target at this stratum, remove it. */ |
| 565 | strata stratum = t->stratum (); |
| 566 | |
| 567 | if (m_stack[stratum] != NULL) |
| 568 | { |
| 569 | target_ops *prev = m_stack[stratum]; |
| 570 | m_stack[stratum] = NULL; |
| 571 | target_close (prev); |
| 572 | } |
| 573 | |
| 574 | /* Now add the new one. */ |
| 575 | m_stack[stratum] = t; |
| 576 | |
| 577 | if (m_top < stratum) |
| 578 | m_top = stratum; |
| 579 | } |
| 580 | |
| 581 | /* See target.h. */ |
| 582 | |
| 583 | void |
| 584 | push_target (struct target_ops *t) |
| 585 | { |
| 586 | g_target_stack.push (t); |
| 587 | } |
| 588 | |
| 589 | /* See target.h. */ |
| 590 | |
| 591 | int |
| 592 | unpush_target (struct target_ops *t) |
| 593 | { |
| 594 | return g_target_stack.unpush (t); |
| 595 | } |
| 596 | |
| 597 | /* See target.h. */ |
| 598 | |
| 599 | bool |
| 600 | target_stack::unpush (target_ops *t) |
| 601 | { |
| 602 | strata stratum = t->stratum (); |
| 603 | |
| 604 | if (stratum == dummy_stratum) |
| 605 | internal_error (__FILE__, __LINE__, |
| 606 | _("Attempt to unpush the dummy target")); |
| 607 | |
| 608 | gdb_assert (t != NULL); |
| 609 | |
| 610 | /* Look for the specified target. Note that a target can only occur |
| 611 | once in the target stack. */ |
| 612 | |
| 613 | if (m_stack[stratum] != t) |
| 614 | { |
| 615 | /* If T wasn't pushed, quit. Only open targets should be |
| 616 | closed. */ |
| 617 | return false; |
| 618 | } |
| 619 | |
| 620 | /* Unchain the target. */ |
| 621 | m_stack[stratum] = NULL; |
| 622 | |
| 623 | if (m_top == stratum) |
| 624 | m_top = t->beneath ()->stratum (); |
| 625 | |
| 626 | /* Finally close the target. Note we do this after unchaining, so |
| 627 | any target method calls from within the target_close |
| 628 | implementation don't end up in T anymore. */ |
| 629 | target_close (t); |
| 630 | |
| 631 | return true; |
| 632 | } |
| 633 | |
| 634 | /* Unpush TARGET and assert that it worked. */ |
| 635 | |
| 636 | static void |
| 637 | unpush_target_and_assert (struct target_ops *target) |
| 638 | { |
| 639 | if (!unpush_target (target)) |
| 640 | { |
| 641 | fprintf_unfiltered (gdb_stderr, |
| 642 | "pop_all_targets couldn't find target %s\n", |
| 643 | target->shortname ()); |
| 644 | internal_error (__FILE__, __LINE__, |
| 645 | _("failed internal consistency check")); |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | void |
| 650 | pop_all_targets_above (enum strata above_stratum) |
| 651 | { |
| 652 | while ((int) (current_top_target ()->stratum ()) > (int) above_stratum) |
| 653 | unpush_target_and_assert (current_top_target ()); |
| 654 | } |
| 655 | |
| 656 | /* See target.h. */ |
| 657 | |
| 658 | void |
| 659 | pop_all_targets_at_and_above (enum strata stratum) |
| 660 | { |
| 661 | while ((int) (current_top_target ()->stratum ()) >= (int) stratum) |
| 662 | unpush_target_and_assert (current_top_target ()); |
| 663 | } |
| 664 | |
| 665 | void |
| 666 | pop_all_targets (void) |
| 667 | { |
| 668 | pop_all_targets_above (dummy_stratum); |
| 669 | } |
| 670 | |
| 671 | /* Return 1 if T is now pushed in the target stack. Return 0 otherwise. */ |
| 672 | |
| 673 | int |
| 674 | target_is_pushed (struct target_ops *t) |
| 675 | { |
| 676 | return g_target_stack.is_pushed (t); |
| 677 | } |
| 678 | |
| 679 | /* Default implementation of to_get_thread_local_address. */ |
| 680 | |
| 681 | static void |
| 682 | generic_tls_error (void) |
| 683 | { |
| 684 | throw_error (TLS_GENERIC_ERROR, |
| 685 | _("Cannot find thread-local variables on this target")); |
| 686 | } |
| 687 | |
| 688 | /* Using the objfile specified in OBJFILE, find the address for the |
| 689 | current thread's thread-local storage with offset OFFSET. */ |
| 690 | CORE_ADDR |
| 691 | target_translate_tls_address (struct objfile *objfile, CORE_ADDR offset) |
| 692 | { |
| 693 | volatile CORE_ADDR addr = 0; |
| 694 | struct target_ops *target = current_top_target (); |
| 695 | |
| 696 | if (gdbarch_fetch_tls_load_module_address_p (target_gdbarch ())) |
| 697 | { |
| 698 | ptid_t ptid = inferior_ptid; |
| 699 | |
| 700 | TRY |
| 701 | { |
| 702 | CORE_ADDR lm_addr; |
| 703 | |
| 704 | /* Fetch the load module address for this objfile. */ |
| 705 | lm_addr = gdbarch_fetch_tls_load_module_address (target_gdbarch (), |
| 706 | objfile); |
| 707 | |
| 708 | addr = target->get_thread_local_address (ptid, lm_addr, offset); |
| 709 | } |
| 710 | /* If an error occurred, print TLS related messages here. Otherwise, |
| 711 | throw the error to some higher catcher. */ |
| 712 | CATCH (ex, RETURN_MASK_ALL) |
| 713 | { |
| 714 | int objfile_is_library = (objfile->flags & OBJF_SHARED); |
| 715 | |
| 716 | switch (ex.error) |
| 717 | { |
| 718 | case TLS_NO_LIBRARY_SUPPORT_ERROR: |
| 719 | error (_("Cannot find thread-local variables " |
| 720 | "in this thread library.")); |
| 721 | break; |
| 722 | case TLS_LOAD_MODULE_NOT_FOUND_ERROR: |
| 723 | if (objfile_is_library) |
| 724 | error (_("Cannot find shared library `%s' in dynamic" |
| 725 | " linker's load module list"), objfile_name (objfile)); |
| 726 | else |
| 727 | error (_("Cannot find executable file `%s' in dynamic" |
| 728 | " linker's load module list"), objfile_name (objfile)); |
| 729 | break; |
| 730 | case TLS_NOT_ALLOCATED_YET_ERROR: |
| 731 | if (objfile_is_library) |
| 732 | error (_("The inferior has not yet allocated storage for" |
| 733 | " thread-local variables in\n" |
| 734 | "the shared library `%s'\n" |
| 735 | "for %s"), |
| 736 | objfile_name (objfile), target_pid_to_str (ptid)); |
| 737 | else |
| 738 | error (_("The inferior has not yet allocated storage for" |
| 739 | " thread-local variables in\n" |
| 740 | "the executable `%s'\n" |
| 741 | "for %s"), |
| 742 | objfile_name (objfile), target_pid_to_str (ptid)); |
| 743 | break; |
| 744 | case TLS_GENERIC_ERROR: |
| 745 | if (objfile_is_library) |
| 746 | error (_("Cannot find thread-local storage for %s, " |
| 747 | "shared library %s:\n%s"), |
| 748 | target_pid_to_str (ptid), |
| 749 | objfile_name (objfile), ex.message); |
| 750 | else |
| 751 | error (_("Cannot find thread-local storage for %s, " |
| 752 | "executable file %s:\n%s"), |
| 753 | target_pid_to_str (ptid), |
| 754 | objfile_name (objfile), ex.message); |
| 755 | break; |
| 756 | default: |
| 757 | throw_exception (ex); |
| 758 | break; |
| 759 | } |
| 760 | } |
| 761 | END_CATCH |
| 762 | } |
| 763 | /* It wouldn't be wrong here to try a gdbarch method, too; finding |
| 764 | TLS is an ABI-specific thing. But we don't do that yet. */ |
| 765 | else |
| 766 | error (_("Cannot find thread-local variables on this target")); |
| 767 | |
| 768 | return addr; |
| 769 | } |
| 770 | |
| 771 | const char * |
| 772 | target_xfer_status_to_string (enum target_xfer_status status) |
| 773 | { |
| 774 | #define CASE(X) case X: return #X |
| 775 | switch (status) |
| 776 | { |
| 777 | CASE(TARGET_XFER_E_IO); |
| 778 | CASE(TARGET_XFER_UNAVAILABLE); |
| 779 | default: |
| 780 | return "<unknown>"; |
| 781 | } |
| 782 | #undef CASE |
| 783 | }; |
| 784 | |
| 785 | |
| 786 | #undef MIN |
| 787 | #define MIN(A, B) (((A) <= (B)) ? (A) : (B)) |
| 788 | |
| 789 | /* target_read_string -- read a null terminated string, up to LEN bytes, |
| 790 | from MEMADDR in target. Set *ERRNOP to the errno code, or 0 if successful. |
| 791 | Set *STRING to a pointer to malloc'd memory containing the data; the caller |
| 792 | is responsible for freeing it. Return the number of bytes successfully |
| 793 | read. */ |
| 794 | |
| 795 | int |
| 796 | target_read_string (CORE_ADDR memaddr, gdb::unique_xmalloc_ptr<char> *string, |
| 797 | int len, int *errnop) |
| 798 | { |
| 799 | int tlen, offset, i; |
| 800 | gdb_byte buf[4]; |
| 801 | int errcode = 0; |
| 802 | char *buffer; |
| 803 | int buffer_allocated; |
| 804 | char *bufptr; |
| 805 | unsigned int nbytes_read = 0; |
| 806 | |
| 807 | gdb_assert (string); |
| 808 | |
| 809 | /* Small for testing. */ |
| 810 | buffer_allocated = 4; |
| 811 | buffer = (char *) xmalloc (buffer_allocated); |
| 812 | bufptr = buffer; |
| 813 | |
| 814 | while (len > 0) |
| 815 | { |
| 816 | tlen = MIN (len, 4 - (memaddr & 3)); |
| 817 | offset = memaddr & 3; |
| 818 | |
| 819 | errcode = target_read_memory (memaddr & ~3, buf, sizeof buf); |
| 820 | if (errcode != 0) |
| 821 | { |
| 822 | /* The transfer request might have crossed the boundary to an |
| 823 | unallocated region of memory. Retry the transfer, requesting |
| 824 | a single byte. */ |
| 825 | tlen = 1; |
| 826 | offset = 0; |
| 827 | errcode = target_read_memory (memaddr, buf, 1); |
| 828 | if (errcode != 0) |
| 829 | goto done; |
| 830 | } |
| 831 | |
| 832 | if (bufptr - buffer + tlen > buffer_allocated) |
| 833 | { |
| 834 | unsigned int bytes; |
| 835 | |
| 836 | bytes = bufptr - buffer; |
| 837 | buffer_allocated *= 2; |
| 838 | buffer = (char *) xrealloc (buffer, buffer_allocated); |
| 839 | bufptr = buffer + bytes; |
| 840 | } |
| 841 | |
| 842 | for (i = 0; i < tlen; i++) |
| 843 | { |
| 844 | *bufptr++ = buf[i + offset]; |
| 845 | if (buf[i + offset] == '\000') |
| 846 | { |
| 847 | nbytes_read += i + 1; |
| 848 | goto done; |
| 849 | } |
| 850 | } |
| 851 | |
| 852 | memaddr += tlen; |
| 853 | len -= tlen; |
| 854 | nbytes_read += tlen; |
| 855 | } |
| 856 | done: |
| 857 | string->reset (buffer); |
| 858 | if (errnop != NULL) |
| 859 | *errnop = errcode; |
| 860 | return nbytes_read; |
| 861 | } |
| 862 | |
| 863 | struct target_section_table * |
| 864 | target_get_section_table (struct target_ops *target) |
| 865 | { |
| 866 | return target->get_section_table (); |
| 867 | } |
| 868 | |
| 869 | /* Find a section containing ADDR. */ |
| 870 | |
| 871 | struct target_section * |
| 872 | target_section_by_addr (struct target_ops *target, CORE_ADDR addr) |
| 873 | { |
| 874 | struct target_section_table *table = target_get_section_table (target); |
| 875 | struct target_section *secp; |
| 876 | |
| 877 | if (table == NULL) |
| 878 | return NULL; |
| 879 | |
| 880 | for (secp = table->sections; secp < table->sections_end; secp++) |
| 881 | { |
| 882 | if (addr >= secp->addr && addr < secp->endaddr) |
| 883 | return secp; |
| 884 | } |
| 885 | return NULL; |
| 886 | } |
| 887 | |
| 888 | |
| 889 | /* Helper for the memory xfer routines. Checks the attributes of the |
| 890 | memory region of MEMADDR against the read or write being attempted. |
| 891 | If the access is permitted returns true, otherwise returns false. |
| 892 | REGION_P is an optional output parameter. If not-NULL, it is |
| 893 | filled with a pointer to the memory region of MEMADDR. REG_LEN |
| 894 | returns LEN trimmed to the end of the region. This is how much the |
| 895 | caller can continue requesting, if the access is permitted. A |
| 896 | single xfer request must not straddle memory region boundaries. */ |
| 897 | |
| 898 | static int |
| 899 | memory_xfer_check_region (gdb_byte *readbuf, const gdb_byte *writebuf, |
| 900 | ULONGEST memaddr, ULONGEST len, ULONGEST *reg_len, |
| 901 | struct mem_region **region_p) |
| 902 | { |
| 903 | struct mem_region *region; |
| 904 | |
| 905 | region = lookup_mem_region (memaddr); |
| 906 | |
| 907 | if (region_p != NULL) |
| 908 | *region_p = region; |
| 909 | |
| 910 | switch (region->attrib.mode) |
| 911 | { |
| 912 | case MEM_RO: |
| 913 | if (writebuf != NULL) |
| 914 | return 0; |
| 915 | break; |
| 916 | |
| 917 | case MEM_WO: |
| 918 | if (readbuf != NULL) |
| 919 | return 0; |
| 920 | break; |
| 921 | |
| 922 | case MEM_FLASH: |
| 923 | /* We only support writing to flash during "load" for now. */ |
| 924 | if (writebuf != NULL) |
| 925 | error (_("Writing to flash memory forbidden in this context")); |
| 926 | break; |
| 927 | |
| 928 | case MEM_NONE: |
| 929 | return 0; |
| 930 | } |
| 931 | |
| 932 | /* region->hi == 0 means there's no upper bound. */ |
| 933 | if (memaddr + len < region->hi || region->hi == 0) |
| 934 | *reg_len = len; |
| 935 | else |
| 936 | *reg_len = region->hi - memaddr; |
| 937 | |
| 938 | return 1; |
| 939 | } |
| 940 | |
| 941 | /* Read memory from more than one valid target. A core file, for |
| 942 | instance, could have some of memory but delegate other bits to |
| 943 | the target below it. So, we must manually try all targets. */ |
| 944 | |
| 945 | enum target_xfer_status |
| 946 | raw_memory_xfer_partial (struct target_ops *ops, gdb_byte *readbuf, |
| 947 | const gdb_byte *writebuf, ULONGEST memaddr, LONGEST len, |
| 948 | ULONGEST *xfered_len) |
| 949 | { |
| 950 | enum target_xfer_status res; |
| 951 | |
| 952 | do |
| 953 | { |
| 954 | res = ops->xfer_partial (TARGET_OBJECT_MEMORY, NULL, |
| 955 | readbuf, writebuf, memaddr, len, |
| 956 | xfered_len); |
| 957 | if (res == TARGET_XFER_OK) |
| 958 | break; |
| 959 | |
| 960 | /* Stop if the target reports that the memory is not available. */ |
| 961 | if (res == TARGET_XFER_UNAVAILABLE) |
| 962 | break; |
| 963 | |
| 964 | /* We want to continue past core files to executables, but not |
| 965 | past a running target's memory. */ |
| 966 | if (ops->has_all_memory ()) |
| 967 | break; |
| 968 | |
| 969 | ops = ops->beneath (); |
| 970 | } |
| 971 | while (ops != NULL); |
| 972 | |
| 973 | /* The cache works at the raw memory level. Make sure the cache |
| 974 | gets updated with raw contents no matter what kind of memory |
| 975 | object was originally being written. Note we do write-through |
| 976 | first, so that if it fails, we don't write to the cache contents |
| 977 | that never made it to the target. */ |
| 978 | if (writebuf != NULL |
| 979 | && inferior_ptid != null_ptid |
| 980 | && target_dcache_init_p () |
| 981 | && (stack_cache_enabled_p () || code_cache_enabled_p ())) |
| 982 | { |
| 983 | DCACHE *dcache = target_dcache_get (); |
| 984 | |
| 985 | /* Note that writing to an area of memory which wasn't present |
| 986 | in the cache doesn't cause it to be loaded in. */ |
| 987 | dcache_update (dcache, res, memaddr, writebuf, *xfered_len); |
| 988 | } |
| 989 | |
| 990 | return res; |
| 991 | } |
| 992 | |
| 993 | /* Perform a partial memory transfer. |
| 994 | For docs see target.h, to_xfer_partial. */ |
| 995 | |
| 996 | static enum target_xfer_status |
| 997 | memory_xfer_partial_1 (struct target_ops *ops, enum target_object object, |
| 998 | gdb_byte *readbuf, const gdb_byte *writebuf, ULONGEST memaddr, |
| 999 | ULONGEST len, ULONGEST *xfered_len) |
| 1000 | { |
| 1001 | enum target_xfer_status res; |
| 1002 | ULONGEST reg_len; |
| 1003 | struct mem_region *region; |
| 1004 | struct inferior *inf; |
| 1005 | |
| 1006 | /* For accesses to unmapped overlay sections, read directly from |
| 1007 | files. Must do this first, as MEMADDR may need adjustment. */ |
| 1008 | if (readbuf != NULL && overlay_debugging) |
| 1009 | { |
| 1010 | struct obj_section *section = find_pc_overlay (memaddr); |
| 1011 | |
| 1012 | if (pc_in_unmapped_range (memaddr, section)) |
| 1013 | { |
| 1014 | struct target_section_table *table |
| 1015 | = target_get_section_table (ops); |
| 1016 | const char *section_name = section->the_bfd_section->name; |
| 1017 | |
| 1018 | memaddr = overlay_mapped_address (memaddr, section); |
| 1019 | return section_table_xfer_memory_partial (readbuf, writebuf, |
| 1020 | memaddr, len, xfered_len, |
| 1021 | table->sections, |
| 1022 | table->sections_end, |
| 1023 | section_name); |
| 1024 | } |
| 1025 | } |
| 1026 | |
| 1027 | /* Try the executable files, if "trust-readonly-sections" is set. */ |
| 1028 | if (readbuf != NULL && trust_readonly) |
| 1029 | { |
| 1030 | struct target_section *secp; |
| 1031 | struct target_section_table *table; |
| 1032 | |
| 1033 | secp = target_section_by_addr (ops, memaddr); |
| 1034 | if (secp != NULL |
| 1035 | && (bfd_get_section_flags (secp->the_bfd_section->owner, |
| 1036 | secp->the_bfd_section) |
| 1037 | & SEC_READONLY)) |
| 1038 | { |
| 1039 | table = target_get_section_table (ops); |
| 1040 | return section_table_xfer_memory_partial (readbuf, writebuf, |
| 1041 | memaddr, len, xfered_len, |
| 1042 | table->sections, |
| 1043 | table->sections_end, |
| 1044 | NULL); |
| 1045 | } |
| 1046 | } |
| 1047 | |
| 1048 | /* Try GDB's internal data cache. */ |
| 1049 | |
| 1050 | if (!memory_xfer_check_region (readbuf, writebuf, memaddr, len, ®_len, |
| 1051 | ®ion)) |
| 1052 | return TARGET_XFER_E_IO; |
| 1053 | |
| 1054 | if (inferior_ptid != null_ptid) |
| 1055 | inf = current_inferior (); |
| 1056 | else |
| 1057 | inf = NULL; |
| 1058 | |
| 1059 | if (inf != NULL |
| 1060 | && readbuf != NULL |
| 1061 | /* The dcache reads whole cache lines; that doesn't play well |
| 1062 | with reading from a trace buffer, because reading outside of |
| 1063 | the collected memory range fails. */ |
| 1064 | && get_traceframe_number () == -1 |
| 1065 | && (region->attrib.cache |
| 1066 | || (stack_cache_enabled_p () && object == TARGET_OBJECT_STACK_MEMORY) |
| 1067 | || (code_cache_enabled_p () && object == TARGET_OBJECT_CODE_MEMORY))) |
| 1068 | { |
| 1069 | DCACHE *dcache = target_dcache_get_or_init (); |
| 1070 | |
| 1071 | return dcache_read_memory_partial (ops, dcache, memaddr, readbuf, |
| 1072 | reg_len, xfered_len); |
| 1073 | } |
| 1074 | |
| 1075 | /* If none of those methods found the memory we wanted, fall back |
| 1076 | to a target partial transfer. Normally a single call to |
| 1077 | to_xfer_partial is enough; if it doesn't recognize an object |
| 1078 | it will call the to_xfer_partial of the next target down. |
| 1079 | But for memory this won't do. Memory is the only target |
| 1080 | object which can be read from more than one valid target. |
| 1081 | A core file, for instance, could have some of memory but |
| 1082 | delegate other bits to the target below it. So, we must |
| 1083 | manually try all targets. */ |
| 1084 | |
| 1085 | res = raw_memory_xfer_partial (ops, readbuf, writebuf, memaddr, reg_len, |
| 1086 | xfered_len); |
| 1087 | |
| 1088 | /* If we still haven't got anything, return the last error. We |
| 1089 | give up. */ |
| 1090 | return res; |
| 1091 | } |
| 1092 | |
| 1093 | /* Perform a partial memory transfer. For docs see target.h, |
| 1094 | to_xfer_partial. */ |
| 1095 | |
| 1096 | static enum target_xfer_status |
| 1097 | memory_xfer_partial (struct target_ops *ops, enum target_object object, |
| 1098 | gdb_byte *readbuf, const gdb_byte *writebuf, |
| 1099 | ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len) |
| 1100 | { |
| 1101 | enum target_xfer_status res; |
| 1102 | |
| 1103 | /* Zero length requests are ok and require no work. */ |
| 1104 | if (len == 0) |
| 1105 | return TARGET_XFER_EOF; |
| 1106 | |
| 1107 | memaddr = address_significant (target_gdbarch (), memaddr); |
| 1108 | |
| 1109 | /* Fill in READBUF with breakpoint shadows, or WRITEBUF with |
| 1110 | breakpoint insns, thus hiding out from higher layers whether |
| 1111 | there are software breakpoints inserted in the code stream. */ |
| 1112 | if (readbuf != NULL) |
| 1113 | { |
| 1114 | res = memory_xfer_partial_1 (ops, object, readbuf, NULL, memaddr, len, |
| 1115 | xfered_len); |
| 1116 | |
| 1117 | if (res == TARGET_XFER_OK && !show_memory_breakpoints) |
| 1118 | breakpoint_xfer_memory (readbuf, NULL, NULL, memaddr, *xfered_len); |
| 1119 | } |
| 1120 | else |
| 1121 | { |
| 1122 | /* A large write request is likely to be partially satisfied |
| 1123 | by memory_xfer_partial_1. We will continually malloc |
| 1124 | and free a copy of the entire write request for breakpoint |
| 1125 | shadow handling even though we only end up writing a small |
| 1126 | subset of it. Cap writes to a limit specified by the target |
| 1127 | to mitigate this. */ |
| 1128 | len = std::min (ops->get_memory_xfer_limit (), len); |
| 1129 | |
| 1130 | gdb::byte_vector buf (writebuf, writebuf + len); |
| 1131 | breakpoint_xfer_memory (NULL, buf.data (), writebuf, memaddr, len); |
| 1132 | res = memory_xfer_partial_1 (ops, object, NULL, buf.data (), memaddr, len, |
| 1133 | xfered_len); |
| 1134 | } |
| 1135 | |
| 1136 | return res; |
| 1137 | } |
| 1138 | |
| 1139 | scoped_restore_tmpl<int> |
| 1140 | make_scoped_restore_show_memory_breakpoints (int show) |
| 1141 | { |
| 1142 | return make_scoped_restore (&show_memory_breakpoints, show); |
| 1143 | } |
| 1144 | |
| 1145 | /* For docs see target.h, to_xfer_partial. */ |
| 1146 | |
| 1147 | enum target_xfer_status |
| 1148 | target_xfer_partial (struct target_ops *ops, |
| 1149 | enum target_object object, const char *annex, |
| 1150 | gdb_byte *readbuf, const gdb_byte *writebuf, |
| 1151 | ULONGEST offset, ULONGEST len, |
| 1152 | ULONGEST *xfered_len) |
| 1153 | { |
| 1154 | enum target_xfer_status retval; |
| 1155 | |
| 1156 | /* Transfer is done when LEN is zero. */ |
| 1157 | if (len == 0) |
| 1158 | return TARGET_XFER_EOF; |
| 1159 | |
| 1160 | if (writebuf && !may_write_memory) |
| 1161 | error (_("Writing to memory is not allowed (addr %s, len %s)"), |
| 1162 | core_addr_to_string_nz (offset), plongest (len)); |
| 1163 | |
| 1164 | *xfered_len = 0; |
| 1165 | |
| 1166 | /* If this is a memory transfer, let the memory-specific code |
| 1167 | have a look at it instead. Memory transfers are more |
| 1168 | complicated. */ |
| 1169 | if (object == TARGET_OBJECT_MEMORY || object == TARGET_OBJECT_STACK_MEMORY |
| 1170 | || object == TARGET_OBJECT_CODE_MEMORY) |
| 1171 | retval = memory_xfer_partial (ops, object, readbuf, |
| 1172 | writebuf, offset, len, xfered_len); |
| 1173 | else if (object == TARGET_OBJECT_RAW_MEMORY) |
| 1174 | { |
| 1175 | /* Skip/avoid accessing the target if the memory region |
| 1176 | attributes block the access. Check this here instead of in |
| 1177 | raw_memory_xfer_partial as otherwise we'd end up checking |
| 1178 | this twice in the case of the memory_xfer_partial path is |
| 1179 | taken; once before checking the dcache, and another in the |
| 1180 | tail call to raw_memory_xfer_partial. */ |
| 1181 | if (!memory_xfer_check_region (readbuf, writebuf, offset, len, &len, |
| 1182 | NULL)) |
| 1183 | return TARGET_XFER_E_IO; |
| 1184 | |
| 1185 | /* Request the normal memory object from other layers. */ |
| 1186 | retval = raw_memory_xfer_partial (ops, readbuf, writebuf, offset, len, |
| 1187 | xfered_len); |
| 1188 | } |
| 1189 | else |
| 1190 | retval = ops->xfer_partial (object, annex, readbuf, |
| 1191 | writebuf, offset, len, xfered_len); |
| 1192 | |
| 1193 | if (targetdebug) |
| 1194 | { |
| 1195 | const unsigned char *myaddr = NULL; |
| 1196 | |
| 1197 | fprintf_unfiltered (gdb_stdlog, |
| 1198 | "%s:target_xfer_partial " |
| 1199 | "(%d, %s, %s, %s, %s, %s) = %d, %s", |
| 1200 | ops->shortname (), |
| 1201 | (int) object, |
| 1202 | (annex ? annex : "(null)"), |
| 1203 | host_address_to_string (readbuf), |
| 1204 | host_address_to_string (writebuf), |
| 1205 | core_addr_to_string_nz (offset), |
| 1206 | pulongest (len), retval, |
| 1207 | pulongest (*xfered_len)); |
| 1208 | |
| 1209 | if (readbuf) |
| 1210 | myaddr = readbuf; |
| 1211 | if (writebuf) |
| 1212 | myaddr = writebuf; |
| 1213 | if (retval == TARGET_XFER_OK && myaddr != NULL) |
| 1214 | { |
| 1215 | int i; |
| 1216 | |
| 1217 | fputs_unfiltered (", bytes =", gdb_stdlog); |
| 1218 | for (i = 0; i < *xfered_len; i++) |
| 1219 | { |
| 1220 | if ((((intptr_t) &(myaddr[i])) & 0xf) == 0) |
| 1221 | { |
| 1222 | if (targetdebug < 2 && i > 0) |
| 1223 | { |
| 1224 | fprintf_unfiltered (gdb_stdlog, " ..."); |
| 1225 | break; |
| 1226 | } |
| 1227 | fprintf_unfiltered (gdb_stdlog, "\n"); |
| 1228 | } |
| 1229 | |
| 1230 | fprintf_unfiltered (gdb_stdlog, " %02x", myaddr[i] & 0xff); |
| 1231 | } |
| 1232 | } |
| 1233 | |
| 1234 | fputc_unfiltered ('\n', gdb_stdlog); |
| 1235 | } |
| 1236 | |
| 1237 | /* Check implementations of to_xfer_partial update *XFERED_LEN |
| 1238 | properly. Do assertion after printing debug messages, so that we |
| 1239 | can find more clues on assertion failure from debugging messages. */ |
| 1240 | if (retval == TARGET_XFER_OK || retval == TARGET_XFER_UNAVAILABLE) |
| 1241 | gdb_assert (*xfered_len > 0); |
| 1242 | |
| 1243 | return retval; |
| 1244 | } |
| 1245 | |
| 1246 | /* Read LEN bytes of target memory at address MEMADDR, placing the |
| 1247 | results in GDB's memory at MYADDR. Returns either 0 for success or |
| 1248 | -1 if any error occurs. |
| 1249 | |
| 1250 | If an error occurs, no guarantee is made about the contents of the data at |
| 1251 | MYADDR. In particular, the caller should not depend upon partial reads |
| 1252 | filling the buffer with good data. There is no way for the caller to know |
| 1253 | how much good data might have been transfered anyway. Callers that can |
| 1254 | deal with partial reads should call target_read (which will retry until |
| 1255 | it makes no progress, and then return how much was transferred). */ |
| 1256 | |
| 1257 | int |
| 1258 | target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| 1259 | { |
| 1260 | if (target_read (current_top_target (), TARGET_OBJECT_MEMORY, NULL, |
| 1261 | myaddr, memaddr, len) == len) |
| 1262 | return 0; |
| 1263 | else |
| 1264 | return -1; |
| 1265 | } |
| 1266 | |
| 1267 | /* See target/target.h. */ |
| 1268 | |
| 1269 | int |
| 1270 | target_read_uint32 (CORE_ADDR memaddr, uint32_t *result) |
| 1271 | { |
| 1272 | gdb_byte buf[4]; |
| 1273 | int r; |
| 1274 | |
| 1275 | r = target_read_memory (memaddr, buf, sizeof buf); |
| 1276 | if (r != 0) |
| 1277 | return r; |
| 1278 | *result = extract_unsigned_integer (buf, sizeof buf, |
| 1279 | gdbarch_byte_order (target_gdbarch ())); |
| 1280 | return 0; |
| 1281 | } |
| 1282 | |
| 1283 | /* Like target_read_memory, but specify explicitly that this is a read |
| 1284 | from the target's raw memory. That is, this read bypasses the |
| 1285 | dcache, breakpoint shadowing, etc. */ |
| 1286 | |
| 1287 | int |
| 1288 | target_read_raw_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| 1289 | { |
| 1290 | if (target_read (current_top_target (), TARGET_OBJECT_RAW_MEMORY, NULL, |
| 1291 | myaddr, memaddr, len) == len) |
| 1292 | return 0; |
| 1293 | else |
| 1294 | return -1; |
| 1295 | } |
| 1296 | |
| 1297 | /* Like target_read_memory, but specify explicitly that this is a read from |
| 1298 | the target's stack. This may trigger different cache behavior. */ |
| 1299 | |
| 1300 | int |
| 1301 | target_read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| 1302 | { |
| 1303 | if (target_read (current_top_target (), TARGET_OBJECT_STACK_MEMORY, NULL, |
| 1304 | myaddr, memaddr, len) == len) |
| 1305 | return 0; |
| 1306 | else |
| 1307 | return -1; |
| 1308 | } |
| 1309 | |
| 1310 | /* Like target_read_memory, but specify explicitly that this is a read from |
| 1311 | the target's code. This may trigger different cache behavior. */ |
| 1312 | |
| 1313 | int |
| 1314 | target_read_code (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| 1315 | { |
| 1316 | if (target_read (current_top_target (), TARGET_OBJECT_CODE_MEMORY, NULL, |
| 1317 | myaddr, memaddr, len) == len) |
| 1318 | return 0; |
| 1319 | else |
| 1320 | return -1; |
| 1321 | } |
| 1322 | |
| 1323 | /* Write LEN bytes from MYADDR to target memory at address MEMADDR. |
| 1324 | Returns either 0 for success or -1 if any error occurs. If an |
| 1325 | error occurs, no guarantee is made about how much data got written. |
| 1326 | Callers that can deal with partial writes should call |
| 1327 | target_write. */ |
| 1328 | |
| 1329 | int |
| 1330 | target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len) |
| 1331 | { |
| 1332 | if (target_write (current_top_target (), TARGET_OBJECT_MEMORY, NULL, |
| 1333 | myaddr, memaddr, len) == len) |
| 1334 | return 0; |
| 1335 | else |
| 1336 | return -1; |
| 1337 | } |
| 1338 | |
| 1339 | /* Write LEN bytes from MYADDR to target raw memory at address |
| 1340 | MEMADDR. Returns either 0 for success or -1 if any error occurs. |
| 1341 | If an error occurs, no guarantee is made about how much data got |
| 1342 | written. Callers that can deal with partial writes should call |
| 1343 | target_write. */ |
| 1344 | |
| 1345 | int |
| 1346 | target_write_raw_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len) |
| 1347 | { |
| 1348 | if (target_write (current_top_target (), TARGET_OBJECT_RAW_MEMORY, NULL, |
| 1349 | myaddr, memaddr, len) == len) |
| 1350 | return 0; |
| 1351 | else |
| 1352 | return -1; |
| 1353 | } |
| 1354 | |
| 1355 | /* Fetch the target's memory map. */ |
| 1356 | |
| 1357 | std::vector<mem_region> |
| 1358 | target_memory_map (void) |
| 1359 | { |
| 1360 | std::vector<mem_region> result = current_top_target ()->memory_map (); |
| 1361 | if (result.empty ()) |
| 1362 | return result; |
| 1363 | |
| 1364 | std::sort (result.begin (), result.end ()); |
| 1365 | |
| 1366 | /* Check that regions do not overlap. Simultaneously assign |
| 1367 | a numbering for the "mem" commands to use to refer to |
| 1368 | each region. */ |
| 1369 | mem_region *last_one = NULL; |
| 1370 | for (size_t ix = 0; ix < result.size (); ix++) |
| 1371 | { |
| 1372 | mem_region *this_one = &result[ix]; |
| 1373 | this_one->number = ix; |
| 1374 | |
| 1375 | if (last_one != NULL && last_one->hi > this_one->lo) |
| 1376 | { |
| 1377 | warning (_("Overlapping regions in memory map: ignoring")); |
| 1378 | return std::vector<mem_region> (); |
| 1379 | } |
| 1380 | |
| 1381 | last_one = this_one; |
| 1382 | } |
| 1383 | |
| 1384 | return result; |
| 1385 | } |
| 1386 | |
| 1387 | void |
| 1388 | target_flash_erase (ULONGEST address, LONGEST length) |
| 1389 | { |
| 1390 | current_top_target ()->flash_erase (address, length); |
| 1391 | } |
| 1392 | |
| 1393 | void |
| 1394 | target_flash_done (void) |
| 1395 | { |
| 1396 | current_top_target ()->flash_done (); |
| 1397 | } |
| 1398 | |
| 1399 | static void |
| 1400 | show_trust_readonly (struct ui_file *file, int from_tty, |
| 1401 | struct cmd_list_element *c, const char *value) |
| 1402 | { |
| 1403 | fprintf_filtered (file, |
| 1404 | _("Mode for reading from readonly sections is %s.\n"), |
| 1405 | value); |
| 1406 | } |
| 1407 | |
| 1408 | /* Target vector read/write partial wrapper functions. */ |
| 1409 | |
| 1410 | static enum target_xfer_status |
| 1411 | target_read_partial (struct target_ops *ops, |
| 1412 | enum target_object object, |
| 1413 | const char *annex, gdb_byte *buf, |
| 1414 | ULONGEST offset, ULONGEST len, |
| 1415 | ULONGEST *xfered_len) |
| 1416 | { |
| 1417 | return target_xfer_partial (ops, object, annex, buf, NULL, offset, len, |
| 1418 | xfered_len); |
| 1419 | } |
| 1420 | |
| 1421 | static enum target_xfer_status |
| 1422 | target_write_partial (struct target_ops *ops, |
| 1423 | enum target_object object, |
| 1424 | const char *annex, const gdb_byte *buf, |
| 1425 | ULONGEST offset, LONGEST len, ULONGEST *xfered_len) |
| 1426 | { |
| 1427 | return target_xfer_partial (ops, object, annex, NULL, buf, offset, len, |
| 1428 | xfered_len); |
| 1429 | } |
| 1430 | |
| 1431 | /* Wrappers to perform the full transfer. */ |
| 1432 | |
| 1433 | /* For docs on target_read see target.h. */ |
| 1434 | |
| 1435 | LONGEST |
| 1436 | target_read (struct target_ops *ops, |
| 1437 | enum target_object object, |
| 1438 | const char *annex, gdb_byte *buf, |
| 1439 | ULONGEST offset, LONGEST len) |
| 1440 | { |
| 1441 | LONGEST xfered_total = 0; |
| 1442 | int unit_size = 1; |
| 1443 | |
| 1444 | /* If we are reading from a memory object, find the length of an addressable |
| 1445 | unit for that architecture. */ |
| 1446 | if (object == TARGET_OBJECT_MEMORY |
| 1447 | || object == TARGET_OBJECT_STACK_MEMORY |
| 1448 | || object == TARGET_OBJECT_CODE_MEMORY |
| 1449 | || object == TARGET_OBJECT_RAW_MEMORY) |
| 1450 | unit_size = gdbarch_addressable_memory_unit_size (target_gdbarch ()); |
| 1451 | |
| 1452 | while (xfered_total < len) |
| 1453 | { |
| 1454 | ULONGEST xfered_partial; |
| 1455 | enum target_xfer_status status; |
| 1456 | |
| 1457 | status = target_read_partial (ops, object, annex, |
| 1458 | buf + xfered_total * unit_size, |
| 1459 | offset + xfered_total, len - xfered_total, |
| 1460 | &xfered_partial); |
| 1461 | |
| 1462 | /* Call an observer, notifying them of the xfer progress? */ |
| 1463 | if (status == TARGET_XFER_EOF) |
| 1464 | return xfered_total; |
| 1465 | else if (status == TARGET_XFER_OK) |
| 1466 | { |
| 1467 | xfered_total += xfered_partial; |
| 1468 | QUIT; |
| 1469 | } |
| 1470 | else |
| 1471 | return TARGET_XFER_E_IO; |
| 1472 | |
| 1473 | } |
| 1474 | return len; |
| 1475 | } |
| 1476 | |
| 1477 | /* Assuming that the entire [begin, end) range of memory cannot be |
| 1478 | read, try to read whatever subrange is possible to read. |
| 1479 | |
| 1480 | The function returns, in RESULT, either zero or one memory block. |
| 1481 | If there's a readable subrange at the beginning, it is completely |
| 1482 | read and returned. Any further readable subrange will not be read. |
| 1483 | Otherwise, if there's a readable subrange at the end, it will be |
| 1484 | completely read and returned. Any readable subranges before it |
| 1485 | (obviously, not starting at the beginning), will be ignored. In |
| 1486 | other cases -- either no readable subrange, or readable subrange(s) |
| 1487 | that is neither at the beginning, or end, nothing is returned. |
| 1488 | |
| 1489 | The purpose of this function is to handle a read across a boundary |
| 1490 | of accessible memory in a case when memory map is not available. |
| 1491 | The above restrictions are fine for this case, but will give |
| 1492 | incorrect results if the memory is 'patchy'. However, supporting |
| 1493 | 'patchy' memory would require trying to read every single byte, |
| 1494 | and it seems unacceptable solution. Explicit memory map is |
| 1495 | recommended for this case -- and target_read_memory_robust will |
| 1496 | take care of reading multiple ranges then. */ |
| 1497 | |
| 1498 | static void |
| 1499 | read_whatever_is_readable (struct target_ops *ops, |
| 1500 | const ULONGEST begin, const ULONGEST end, |
| 1501 | int unit_size, |
| 1502 | std::vector<memory_read_result> *result) |
| 1503 | { |
| 1504 | ULONGEST current_begin = begin; |
| 1505 | ULONGEST current_end = end; |
| 1506 | int forward; |
| 1507 | ULONGEST xfered_len; |
| 1508 | |
| 1509 | /* If we previously failed to read 1 byte, nothing can be done here. */ |
| 1510 | if (end - begin <= 1) |
| 1511 | return; |
| 1512 | |
| 1513 | gdb::unique_xmalloc_ptr<gdb_byte> buf ((gdb_byte *) xmalloc (end - begin)); |
| 1514 | |
| 1515 | /* Check that either first or the last byte is readable, and give up |
| 1516 | if not. This heuristic is meant to permit reading accessible memory |
| 1517 | at the boundary of accessible region. */ |
| 1518 | if (target_read_partial (ops, TARGET_OBJECT_MEMORY, NULL, |
| 1519 | buf.get (), begin, 1, &xfered_len) == TARGET_XFER_OK) |
| 1520 | { |
| 1521 | forward = 1; |
| 1522 | ++current_begin; |
| 1523 | } |
| 1524 | else if (target_read_partial (ops, TARGET_OBJECT_MEMORY, NULL, |
| 1525 | buf.get () + (end - begin) - 1, end - 1, 1, |
| 1526 | &xfered_len) == TARGET_XFER_OK) |
| 1527 | { |
| 1528 | forward = 0; |
| 1529 | --current_end; |
| 1530 | } |
| 1531 | else |
| 1532 | return; |
| 1533 | |
| 1534 | /* Loop invariant is that the [current_begin, current_end) was previously |
| 1535 | found to be not readable as a whole. |
| 1536 | |
| 1537 | Note loop condition -- if the range has 1 byte, we can't divide the range |
| 1538 | so there's no point trying further. */ |
| 1539 | while (current_end - current_begin > 1) |
| 1540 | { |
| 1541 | ULONGEST first_half_begin, first_half_end; |
| 1542 | ULONGEST second_half_begin, second_half_end; |
| 1543 | LONGEST xfer; |
| 1544 | ULONGEST middle = current_begin + (current_end - current_begin) / 2; |
| 1545 | |
| 1546 | if (forward) |
| 1547 | { |
| 1548 | first_half_begin = current_begin; |
| 1549 | first_half_end = middle; |
| 1550 | second_half_begin = middle; |
| 1551 | second_half_end = current_end; |
| 1552 | } |
| 1553 | else |
| 1554 | { |
| 1555 | first_half_begin = middle; |
| 1556 | first_half_end = current_end; |
| 1557 | second_half_begin = current_begin; |
| 1558 | second_half_end = middle; |
| 1559 | } |
| 1560 | |
| 1561 | xfer = target_read (ops, TARGET_OBJECT_MEMORY, NULL, |
| 1562 | buf.get () + (first_half_begin - begin) * unit_size, |
| 1563 | first_half_begin, |
| 1564 | first_half_end - first_half_begin); |
| 1565 | |
| 1566 | if (xfer == first_half_end - first_half_begin) |
| 1567 | { |
| 1568 | /* This half reads up fine. So, the error must be in the |
| 1569 | other half. */ |
| 1570 | current_begin = second_half_begin; |
| 1571 | current_end = second_half_end; |
| 1572 | } |
| 1573 | else |
| 1574 | { |
| 1575 | /* This half is not readable. Because we've tried one byte, we |
| 1576 | know some part of this half if actually readable. Go to the next |
| 1577 | iteration to divide again and try to read. |
| 1578 | |
| 1579 | We don't handle the other half, because this function only tries |
| 1580 | to read a single readable subrange. */ |
| 1581 | current_begin = first_half_begin; |
| 1582 | current_end = first_half_end; |
| 1583 | } |
| 1584 | } |
| 1585 | |
| 1586 | if (forward) |
| 1587 | { |
| 1588 | /* The [begin, current_begin) range has been read. */ |
| 1589 | result->emplace_back (begin, current_end, std::move (buf)); |
| 1590 | } |
| 1591 | else |
| 1592 | { |
| 1593 | /* The [current_end, end) range has been read. */ |
| 1594 | LONGEST region_len = end - current_end; |
| 1595 | |
| 1596 | gdb::unique_xmalloc_ptr<gdb_byte> data |
| 1597 | ((gdb_byte *) xmalloc (region_len * unit_size)); |
| 1598 | memcpy (data.get (), buf.get () + (current_end - begin) * unit_size, |
| 1599 | region_len * unit_size); |
| 1600 | result->emplace_back (current_end, end, std::move (data)); |
| 1601 | } |
| 1602 | } |
| 1603 | |
| 1604 | std::vector<memory_read_result> |
| 1605 | read_memory_robust (struct target_ops *ops, |
| 1606 | const ULONGEST offset, const LONGEST len) |
| 1607 | { |
| 1608 | std::vector<memory_read_result> result; |
| 1609 | int unit_size = gdbarch_addressable_memory_unit_size (target_gdbarch ()); |
| 1610 | |
| 1611 | LONGEST xfered_total = 0; |
| 1612 | while (xfered_total < len) |
| 1613 | { |
| 1614 | struct mem_region *region = lookup_mem_region (offset + xfered_total); |
| 1615 | LONGEST region_len; |
| 1616 | |
| 1617 | /* If there is no explicit region, a fake one should be created. */ |
| 1618 | gdb_assert (region); |
| 1619 | |
| 1620 | if (region->hi == 0) |
| 1621 | region_len = len - xfered_total; |
| 1622 | else |
| 1623 | region_len = region->hi - offset; |
| 1624 | |
| 1625 | if (region->attrib.mode == MEM_NONE || region->attrib.mode == MEM_WO) |
| 1626 | { |
| 1627 | /* Cannot read this region. Note that we can end up here only |
| 1628 | if the region is explicitly marked inaccessible, or |
| 1629 | 'inaccessible-by-default' is in effect. */ |
| 1630 | xfered_total += region_len; |
| 1631 | } |
| 1632 | else |
| 1633 | { |
| 1634 | LONGEST to_read = std::min (len - xfered_total, region_len); |
| 1635 | gdb::unique_xmalloc_ptr<gdb_byte> buffer |
| 1636 | ((gdb_byte *) xmalloc (to_read * unit_size)); |
| 1637 | |
| 1638 | LONGEST xfered_partial = |
| 1639 | target_read (ops, TARGET_OBJECT_MEMORY, NULL, buffer.get (), |
| 1640 | offset + xfered_total, to_read); |
| 1641 | /* Call an observer, notifying them of the xfer progress? */ |
| 1642 | if (xfered_partial <= 0) |
| 1643 | { |
| 1644 | /* Got an error reading full chunk. See if maybe we can read |
| 1645 | some subrange. */ |
| 1646 | read_whatever_is_readable (ops, offset + xfered_total, |
| 1647 | offset + xfered_total + to_read, |
| 1648 | unit_size, &result); |
| 1649 | xfered_total += to_read; |
| 1650 | } |
| 1651 | else |
| 1652 | { |
| 1653 | result.emplace_back (offset + xfered_total, |
| 1654 | offset + xfered_total + xfered_partial, |
| 1655 | std::move (buffer)); |
| 1656 | xfered_total += xfered_partial; |
| 1657 | } |
| 1658 | QUIT; |
| 1659 | } |
| 1660 | } |
| 1661 | |
| 1662 | return result; |
| 1663 | } |
| 1664 | |
| 1665 | |
| 1666 | /* An alternative to target_write with progress callbacks. */ |
| 1667 | |
| 1668 | LONGEST |
| 1669 | target_write_with_progress (struct target_ops *ops, |
| 1670 | enum target_object object, |
| 1671 | const char *annex, const gdb_byte *buf, |
| 1672 | ULONGEST offset, LONGEST len, |
| 1673 | void (*progress) (ULONGEST, void *), void *baton) |
| 1674 | { |
| 1675 | LONGEST xfered_total = 0; |
| 1676 | int unit_size = 1; |
| 1677 | |
| 1678 | /* If we are writing to a memory object, find the length of an addressable |
| 1679 | unit for that architecture. */ |
| 1680 | if (object == TARGET_OBJECT_MEMORY |
| 1681 | || object == TARGET_OBJECT_STACK_MEMORY |
| 1682 | || object == TARGET_OBJECT_CODE_MEMORY |
| 1683 | || object == TARGET_OBJECT_RAW_MEMORY) |
| 1684 | unit_size = gdbarch_addressable_memory_unit_size (target_gdbarch ()); |
| 1685 | |
| 1686 | /* Give the progress callback a chance to set up. */ |
| 1687 | if (progress) |
| 1688 | (*progress) (0, baton); |
| 1689 | |
| 1690 | while (xfered_total < len) |
| 1691 | { |
| 1692 | ULONGEST xfered_partial; |
| 1693 | enum target_xfer_status status; |
| 1694 | |
| 1695 | status = target_write_partial (ops, object, annex, |
| 1696 | buf + xfered_total * unit_size, |
| 1697 | offset + xfered_total, len - xfered_total, |
| 1698 | &xfered_partial); |
| 1699 | |
| 1700 | if (status != TARGET_XFER_OK) |
| 1701 | return status == TARGET_XFER_EOF ? xfered_total : TARGET_XFER_E_IO; |
| 1702 | |
| 1703 | if (progress) |
| 1704 | (*progress) (xfered_partial, baton); |
| 1705 | |
| 1706 | xfered_total += xfered_partial; |
| 1707 | QUIT; |
| 1708 | } |
| 1709 | return len; |
| 1710 | } |
| 1711 | |
| 1712 | /* For docs on target_write see target.h. */ |
| 1713 | |
| 1714 | LONGEST |
| 1715 | target_write (struct target_ops *ops, |
| 1716 | enum target_object object, |
| 1717 | const char *annex, const gdb_byte *buf, |
| 1718 | ULONGEST offset, LONGEST len) |
| 1719 | { |
| 1720 | return target_write_with_progress (ops, object, annex, buf, offset, len, |
| 1721 | NULL, NULL); |
| 1722 | } |
| 1723 | |
| 1724 | /* Help for target_read_alloc and target_read_stralloc. See their comments |
| 1725 | for details. */ |
| 1726 | |
| 1727 | template <typename T> |
| 1728 | gdb::optional<gdb::def_vector<T>> |
| 1729 | target_read_alloc_1 (struct target_ops *ops, enum target_object object, |
| 1730 | const char *annex) |
| 1731 | { |
| 1732 | gdb::def_vector<T> buf; |
| 1733 | size_t buf_pos = 0; |
| 1734 | const int chunk = 4096; |
| 1735 | |
| 1736 | /* This function does not have a length parameter; it reads the |
| 1737 | entire OBJECT). Also, it doesn't support objects fetched partly |
| 1738 | from one target and partly from another (in a different stratum, |
| 1739 | e.g. a core file and an executable). Both reasons make it |
| 1740 | unsuitable for reading memory. */ |
| 1741 | gdb_assert (object != TARGET_OBJECT_MEMORY); |
| 1742 | |
| 1743 | /* Start by reading up to 4K at a time. The target will throttle |
| 1744 | this number down if necessary. */ |
| 1745 | while (1) |
| 1746 | { |
| 1747 | ULONGEST xfered_len; |
| 1748 | enum target_xfer_status status; |
| 1749 | |
| 1750 | buf.resize (buf_pos + chunk); |
| 1751 | |
| 1752 | status = target_read_partial (ops, object, annex, |
| 1753 | (gdb_byte *) &buf[buf_pos], |
| 1754 | buf_pos, chunk, |
| 1755 | &xfered_len); |
| 1756 | |
| 1757 | if (status == TARGET_XFER_EOF) |
| 1758 | { |
| 1759 | /* Read all there was. */ |
| 1760 | buf.resize (buf_pos); |
| 1761 | return buf; |
| 1762 | } |
| 1763 | else if (status != TARGET_XFER_OK) |
| 1764 | { |
| 1765 | /* An error occurred. */ |
| 1766 | return {}; |
| 1767 | } |
| 1768 | |
| 1769 | buf_pos += xfered_len; |
| 1770 | |
| 1771 | QUIT; |
| 1772 | } |
| 1773 | } |
| 1774 | |
| 1775 | /* See target.h */ |
| 1776 | |
| 1777 | gdb::optional<gdb::byte_vector> |
| 1778 | target_read_alloc (struct target_ops *ops, enum target_object object, |
| 1779 | const char *annex) |
| 1780 | { |
| 1781 | return target_read_alloc_1<gdb_byte> (ops, object, annex); |
| 1782 | } |
| 1783 | |
| 1784 | /* See target.h. */ |
| 1785 | |
| 1786 | gdb::optional<gdb::char_vector> |
| 1787 | target_read_stralloc (struct target_ops *ops, enum target_object object, |
| 1788 | const char *annex) |
| 1789 | { |
| 1790 | gdb::optional<gdb::char_vector> buf |
| 1791 | = target_read_alloc_1<char> (ops, object, annex); |
| 1792 | |
| 1793 | if (!buf) |
| 1794 | return {}; |
| 1795 | |
| 1796 | if (buf->back () != '\0') |
| 1797 | buf->push_back ('\0'); |
| 1798 | |
| 1799 | /* Check for embedded NUL bytes; but allow trailing NULs. */ |
| 1800 | for (auto it = std::find (buf->begin (), buf->end (), '\0'); |
| 1801 | it != buf->end (); it++) |
| 1802 | if (*it != '\0') |
| 1803 | { |
| 1804 | warning (_("target object %d, annex %s, " |
| 1805 | "contained unexpected null characters"), |
| 1806 | (int) object, annex ? annex : "(none)"); |
| 1807 | break; |
| 1808 | } |
| 1809 | |
| 1810 | return buf; |
| 1811 | } |
| 1812 | |
| 1813 | /* Memory transfer methods. */ |
| 1814 | |
| 1815 | void |
| 1816 | get_target_memory (struct target_ops *ops, CORE_ADDR addr, gdb_byte *buf, |
| 1817 | LONGEST len) |
| 1818 | { |
| 1819 | /* This method is used to read from an alternate, non-current |
| 1820 | target. This read must bypass the overlay support (as symbols |
| 1821 | don't match this target), and GDB's internal cache (wrong cache |
| 1822 | for this target). */ |
| 1823 | if (target_read (ops, TARGET_OBJECT_RAW_MEMORY, NULL, buf, addr, len) |
| 1824 | != len) |
| 1825 | memory_error (TARGET_XFER_E_IO, addr); |
| 1826 | } |
| 1827 | |
| 1828 | ULONGEST |
| 1829 | get_target_memory_unsigned (struct target_ops *ops, CORE_ADDR addr, |
| 1830 | int len, enum bfd_endian byte_order) |
| 1831 | { |
| 1832 | gdb_byte buf[sizeof (ULONGEST)]; |
| 1833 | |
| 1834 | gdb_assert (len <= sizeof (buf)); |
| 1835 | get_target_memory (ops, addr, buf, len); |
| 1836 | return extract_unsigned_integer (buf, len, byte_order); |
| 1837 | } |
| 1838 | |
| 1839 | /* See target.h. */ |
| 1840 | |
| 1841 | int |
| 1842 | target_insert_breakpoint (struct gdbarch *gdbarch, |
| 1843 | struct bp_target_info *bp_tgt) |
| 1844 | { |
| 1845 | if (!may_insert_breakpoints) |
| 1846 | { |
| 1847 | warning (_("May not insert breakpoints")); |
| 1848 | return 1; |
| 1849 | } |
| 1850 | |
| 1851 | return current_top_target ()->insert_breakpoint (gdbarch, bp_tgt); |
| 1852 | } |
| 1853 | |
| 1854 | /* See target.h. */ |
| 1855 | |
| 1856 | int |
| 1857 | target_remove_breakpoint (struct gdbarch *gdbarch, |
| 1858 | struct bp_target_info *bp_tgt, |
| 1859 | enum remove_bp_reason reason) |
| 1860 | { |
| 1861 | /* This is kind of a weird case to handle, but the permission might |
| 1862 | have been changed after breakpoints were inserted - in which case |
| 1863 | we should just take the user literally and assume that any |
| 1864 | breakpoints should be left in place. */ |
| 1865 | if (!may_insert_breakpoints) |
| 1866 | { |
| 1867 | warning (_("May not remove breakpoints")); |
| 1868 | return 1; |
| 1869 | } |
| 1870 | |
| 1871 | return current_top_target ()->remove_breakpoint (gdbarch, bp_tgt, reason); |
| 1872 | } |
| 1873 | |
| 1874 | static void |
| 1875 | info_target_command (const char *args, int from_tty) |
| 1876 | { |
| 1877 | int has_all_mem = 0; |
| 1878 | |
| 1879 | if (symfile_objfile != NULL) |
| 1880 | printf_unfiltered (_("Symbols from \"%s\".\n"), |
| 1881 | objfile_name (symfile_objfile)); |
| 1882 | |
| 1883 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 1884 | { |
| 1885 | if (!t->has_memory ()) |
| 1886 | continue; |
| 1887 | |
| 1888 | if ((int) (t->stratum ()) <= (int) dummy_stratum) |
| 1889 | continue; |
| 1890 | if (has_all_mem) |
| 1891 | printf_unfiltered (_("\tWhile running this, " |
| 1892 | "GDB does not access memory from...\n")); |
| 1893 | printf_unfiltered ("%s:\n", t->longname ()); |
| 1894 | t->files_info (); |
| 1895 | has_all_mem = t->has_all_memory (); |
| 1896 | } |
| 1897 | } |
| 1898 | |
| 1899 | /* This function is called before any new inferior is created, e.g. |
| 1900 | by running a program, attaching, or connecting to a target. |
| 1901 | It cleans up any state from previous invocations which might |
| 1902 | change between runs. This is a subset of what target_preopen |
| 1903 | resets (things which might change between targets). */ |
| 1904 | |
| 1905 | void |
| 1906 | target_pre_inferior (int from_tty) |
| 1907 | { |
| 1908 | /* Clear out solib state. Otherwise the solib state of the previous |
| 1909 | inferior might have survived and is entirely wrong for the new |
| 1910 | target. This has been observed on GNU/Linux using glibc 2.3. How |
| 1911 | to reproduce: |
| 1912 | |
| 1913 | bash$ ./foo& |
| 1914 | [1] 4711 |
| 1915 | bash$ ./foo& |
| 1916 | [1] 4712 |
| 1917 | bash$ gdb ./foo |
| 1918 | [...] |
| 1919 | (gdb) attach 4711 |
| 1920 | (gdb) detach |
| 1921 | (gdb) attach 4712 |
| 1922 | Cannot access memory at address 0xdeadbeef |
| 1923 | */ |
| 1924 | |
| 1925 | /* In some OSs, the shared library list is the same/global/shared |
| 1926 | across inferiors. If code is shared between processes, so are |
| 1927 | memory regions and features. */ |
| 1928 | if (!gdbarch_has_global_solist (target_gdbarch ())) |
| 1929 | { |
| 1930 | no_shared_libraries (NULL, from_tty); |
| 1931 | |
| 1932 | invalidate_target_mem_regions (); |
| 1933 | |
| 1934 | target_clear_description (); |
| 1935 | } |
| 1936 | |
| 1937 | /* attach_flag may be set if the previous process associated with |
| 1938 | the inferior was attached to. */ |
| 1939 | current_inferior ()->attach_flag = 0; |
| 1940 | |
| 1941 | current_inferior ()->highest_thread_num = 0; |
| 1942 | |
| 1943 | agent_capability_invalidate (); |
| 1944 | } |
| 1945 | |
| 1946 | /* Callback for iterate_over_inferiors. Gets rid of the given |
| 1947 | inferior. */ |
| 1948 | |
| 1949 | static int |
| 1950 | dispose_inferior (struct inferior *inf, void *args) |
| 1951 | { |
| 1952 | /* Not all killed inferiors can, or will ever be, removed from the |
| 1953 | inferior list. Killed inferiors clearly don't need to be killed |
| 1954 | again, so, we're done. */ |
| 1955 | if (inf->pid == 0) |
| 1956 | return 0; |
| 1957 | |
| 1958 | thread_info *thread = any_thread_of_inferior (inf); |
| 1959 | if (thread != NULL) |
| 1960 | { |
| 1961 | switch_to_thread (thread); |
| 1962 | |
| 1963 | /* Core inferiors actually should be detached, not killed. */ |
| 1964 | if (target_has_execution) |
| 1965 | target_kill (); |
| 1966 | else |
| 1967 | target_detach (inf, 0); |
| 1968 | } |
| 1969 | |
| 1970 | return 0; |
| 1971 | } |
| 1972 | |
| 1973 | /* This is to be called by the open routine before it does |
| 1974 | anything. */ |
| 1975 | |
| 1976 | void |
| 1977 | target_preopen (int from_tty) |
| 1978 | { |
| 1979 | dont_repeat (); |
| 1980 | |
| 1981 | if (have_inferiors ()) |
| 1982 | { |
| 1983 | if (!from_tty |
| 1984 | || !have_live_inferiors () |
| 1985 | || query (_("A program is being debugged already. Kill it? "))) |
| 1986 | iterate_over_inferiors (dispose_inferior, NULL); |
| 1987 | else |
| 1988 | error (_("Program not killed.")); |
| 1989 | } |
| 1990 | |
| 1991 | /* Calling target_kill may remove the target from the stack. But if |
| 1992 | it doesn't (which seems like a win for UDI), remove it now. */ |
| 1993 | /* Leave the exec target, though. The user may be switching from a |
| 1994 | live process to a core of the same program. */ |
| 1995 | pop_all_targets_above (file_stratum); |
| 1996 | |
| 1997 | target_pre_inferior (from_tty); |
| 1998 | } |
| 1999 | |
| 2000 | /* See target.h. */ |
| 2001 | |
| 2002 | void |
| 2003 | target_detach (inferior *inf, int from_tty) |
| 2004 | { |
| 2005 | /* As long as some to_detach implementations rely on the current_inferior |
| 2006 | (either directly, or indirectly, like through target_gdbarch or by |
| 2007 | reading memory), INF needs to be the current inferior. When that |
| 2008 | requirement will become no longer true, then we can remove this |
| 2009 | assertion. */ |
| 2010 | gdb_assert (inf == current_inferior ()); |
| 2011 | |
| 2012 | if (gdbarch_has_global_breakpoints (target_gdbarch ())) |
| 2013 | /* Don't remove global breakpoints here. They're removed on |
| 2014 | disconnection from the target. */ |
| 2015 | ; |
| 2016 | else |
| 2017 | /* If we're in breakpoints-always-inserted mode, have to remove |
| 2018 | breakpoints before detaching. */ |
| 2019 | remove_breakpoints_inf (current_inferior ()); |
| 2020 | |
| 2021 | prepare_for_detach (); |
| 2022 | |
| 2023 | current_top_target ()->detach (inf, from_tty); |
| 2024 | } |
| 2025 | |
| 2026 | void |
| 2027 | target_disconnect (const char *args, int from_tty) |
| 2028 | { |
| 2029 | /* If we're in breakpoints-always-inserted mode or if breakpoints |
| 2030 | are global across processes, we have to remove them before |
| 2031 | disconnecting. */ |
| 2032 | remove_breakpoints (); |
| 2033 | |
| 2034 | current_top_target ()->disconnect (args, from_tty); |
| 2035 | } |
| 2036 | |
| 2037 | /* See target/target.h. */ |
| 2038 | |
| 2039 | ptid_t |
| 2040 | target_wait (ptid_t ptid, struct target_waitstatus *status, int options) |
| 2041 | { |
| 2042 | return current_top_target ()->wait (ptid, status, options); |
| 2043 | } |
| 2044 | |
| 2045 | /* See target.h. */ |
| 2046 | |
| 2047 | ptid_t |
| 2048 | default_target_wait (struct target_ops *ops, |
| 2049 | ptid_t ptid, struct target_waitstatus *status, |
| 2050 | int options) |
| 2051 | { |
| 2052 | status->kind = TARGET_WAITKIND_IGNORE; |
| 2053 | return minus_one_ptid; |
| 2054 | } |
| 2055 | |
| 2056 | const char * |
| 2057 | target_pid_to_str (ptid_t ptid) |
| 2058 | { |
| 2059 | return current_top_target ()->pid_to_str (ptid); |
| 2060 | } |
| 2061 | |
| 2062 | const char * |
| 2063 | target_thread_name (struct thread_info *info) |
| 2064 | { |
| 2065 | return current_top_target ()->thread_name (info); |
| 2066 | } |
| 2067 | |
| 2068 | struct thread_info * |
| 2069 | target_thread_handle_to_thread_info (const gdb_byte *thread_handle, |
| 2070 | int handle_len, |
| 2071 | struct inferior *inf) |
| 2072 | { |
| 2073 | return current_top_target ()->thread_handle_to_thread_info (thread_handle, |
| 2074 | handle_len, inf); |
| 2075 | } |
| 2076 | |
| 2077 | void |
| 2078 | target_resume (ptid_t ptid, int step, enum gdb_signal signal) |
| 2079 | { |
| 2080 | target_dcache_invalidate (); |
| 2081 | |
| 2082 | current_top_target ()->resume (ptid, step, signal); |
| 2083 | |
| 2084 | registers_changed_ptid (ptid); |
| 2085 | /* We only set the internal executing state here. The user/frontend |
| 2086 | running state is set at a higher level. This also clears the |
| 2087 | thread's stop_pc as side effect. */ |
| 2088 | set_executing (ptid, 1); |
| 2089 | clear_inline_frame_state (ptid); |
| 2090 | } |
| 2091 | |
| 2092 | /* If true, target_commit_resume is a nop. */ |
| 2093 | static int defer_target_commit_resume; |
| 2094 | |
| 2095 | /* See target.h. */ |
| 2096 | |
| 2097 | void |
| 2098 | target_commit_resume (void) |
| 2099 | { |
| 2100 | if (defer_target_commit_resume) |
| 2101 | return; |
| 2102 | |
| 2103 | current_top_target ()->commit_resume (); |
| 2104 | } |
| 2105 | |
| 2106 | /* See target.h. */ |
| 2107 | |
| 2108 | scoped_restore_tmpl<int> |
| 2109 | make_scoped_defer_target_commit_resume () |
| 2110 | { |
| 2111 | return make_scoped_restore (&defer_target_commit_resume, 1); |
| 2112 | } |
| 2113 | |
| 2114 | void |
| 2115 | target_pass_signals (int numsigs, unsigned char *pass_signals) |
| 2116 | { |
| 2117 | current_top_target ()->pass_signals (numsigs, pass_signals); |
| 2118 | } |
| 2119 | |
| 2120 | void |
| 2121 | target_program_signals (int numsigs, unsigned char *program_signals) |
| 2122 | { |
| 2123 | current_top_target ()->program_signals (numsigs, program_signals); |
| 2124 | } |
| 2125 | |
| 2126 | static int |
| 2127 | default_follow_fork (struct target_ops *self, int follow_child, |
| 2128 | int detach_fork) |
| 2129 | { |
| 2130 | /* Some target returned a fork event, but did not know how to follow it. */ |
| 2131 | internal_error (__FILE__, __LINE__, |
| 2132 | _("could not find a target to follow fork")); |
| 2133 | } |
| 2134 | |
| 2135 | /* Look through the list of possible targets for a target that can |
| 2136 | follow forks. */ |
| 2137 | |
| 2138 | int |
| 2139 | target_follow_fork (int follow_child, int detach_fork) |
| 2140 | { |
| 2141 | return current_top_target ()->follow_fork (follow_child, detach_fork); |
| 2142 | } |
| 2143 | |
| 2144 | /* Target wrapper for follow exec hook. */ |
| 2145 | |
| 2146 | void |
| 2147 | target_follow_exec (struct inferior *inf, char *execd_pathname) |
| 2148 | { |
| 2149 | current_top_target ()->follow_exec (inf, execd_pathname); |
| 2150 | } |
| 2151 | |
| 2152 | static void |
| 2153 | default_mourn_inferior (struct target_ops *self) |
| 2154 | { |
| 2155 | internal_error (__FILE__, __LINE__, |
| 2156 | _("could not find a target to follow mourn inferior")); |
| 2157 | } |
| 2158 | |
| 2159 | void |
| 2160 | target_mourn_inferior (ptid_t ptid) |
| 2161 | { |
| 2162 | gdb_assert (ptid == inferior_ptid); |
| 2163 | current_top_target ()->mourn_inferior (); |
| 2164 | |
| 2165 | /* We no longer need to keep handles on any of the object files. |
| 2166 | Make sure to release them to avoid unnecessarily locking any |
| 2167 | of them while we're not actually debugging. */ |
| 2168 | bfd_cache_close_all (); |
| 2169 | } |
| 2170 | |
| 2171 | /* Look for a target which can describe architectural features, starting |
| 2172 | from TARGET. If we find one, return its description. */ |
| 2173 | |
| 2174 | const struct target_desc * |
| 2175 | target_read_description (struct target_ops *target) |
| 2176 | { |
| 2177 | return target->read_description (); |
| 2178 | } |
| 2179 | |
| 2180 | /* This implements a basic search of memory, reading target memory and |
| 2181 | performing the search here (as opposed to performing the search in on the |
| 2182 | target side with, for example, gdbserver). */ |
| 2183 | |
| 2184 | int |
| 2185 | simple_search_memory (struct target_ops *ops, |
| 2186 | CORE_ADDR start_addr, ULONGEST search_space_len, |
| 2187 | const gdb_byte *pattern, ULONGEST pattern_len, |
| 2188 | CORE_ADDR *found_addrp) |
| 2189 | { |
| 2190 | /* NOTE: also defined in find.c testcase. */ |
| 2191 | #define SEARCH_CHUNK_SIZE 16000 |
| 2192 | const unsigned chunk_size = SEARCH_CHUNK_SIZE; |
| 2193 | /* Buffer to hold memory contents for searching. */ |
| 2194 | unsigned search_buf_size; |
| 2195 | |
| 2196 | search_buf_size = chunk_size + pattern_len - 1; |
| 2197 | |
| 2198 | /* No point in trying to allocate a buffer larger than the search space. */ |
| 2199 | if (search_space_len < search_buf_size) |
| 2200 | search_buf_size = search_space_len; |
| 2201 | |
| 2202 | gdb::byte_vector search_buf (search_buf_size); |
| 2203 | |
| 2204 | /* Prime the search buffer. */ |
| 2205 | |
| 2206 | if (target_read (ops, TARGET_OBJECT_MEMORY, NULL, |
| 2207 | search_buf.data (), start_addr, search_buf_size) |
| 2208 | != search_buf_size) |
| 2209 | { |
| 2210 | warning (_("Unable to access %s bytes of target " |
| 2211 | "memory at %s, halting search."), |
| 2212 | pulongest (search_buf_size), hex_string (start_addr)); |
| 2213 | return -1; |
| 2214 | } |
| 2215 | |
| 2216 | /* Perform the search. |
| 2217 | |
| 2218 | The loop is kept simple by allocating [N + pattern-length - 1] bytes. |
| 2219 | When we've scanned N bytes we copy the trailing bytes to the start and |
| 2220 | read in another N bytes. */ |
| 2221 | |
| 2222 | while (search_space_len >= pattern_len) |
| 2223 | { |
| 2224 | gdb_byte *found_ptr; |
| 2225 | unsigned nr_search_bytes |
| 2226 | = std::min (search_space_len, (ULONGEST) search_buf_size); |
| 2227 | |
| 2228 | found_ptr = (gdb_byte *) memmem (search_buf.data (), nr_search_bytes, |
| 2229 | pattern, pattern_len); |
| 2230 | |
| 2231 | if (found_ptr != NULL) |
| 2232 | { |
| 2233 | CORE_ADDR found_addr = start_addr + (found_ptr - search_buf.data ()); |
| 2234 | |
| 2235 | *found_addrp = found_addr; |
| 2236 | return 1; |
| 2237 | } |
| 2238 | |
| 2239 | /* Not found in this chunk, skip to next chunk. */ |
| 2240 | |
| 2241 | /* Don't let search_space_len wrap here, it's unsigned. */ |
| 2242 | if (search_space_len >= chunk_size) |
| 2243 | search_space_len -= chunk_size; |
| 2244 | else |
| 2245 | search_space_len = 0; |
| 2246 | |
| 2247 | if (search_space_len >= pattern_len) |
| 2248 | { |
| 2249 | unsigned keep_len = search_buf_size - chunk_size; |
| 2250 | CORE_ADDR read_addr = start_addr + chunk_size + keep_len; |
| 2251 | int nr_to_read; |
| 2252 | |
| 2253 | /* Copy the trailing part of the previous iteration to the front |
| 2254 | of the buffer for the next iteration. */ |
| 2255 | gdb_assert (keep_len == pattern_len - 1); |
| 2256 | memcpy (&search_buf[0], &search_buf[chunk_size], keep_len); |
| 2257 | |
| 2258 | nr_to_read = std::min (search_space_len - keep_len, |
| 2259 | (ULONGEST) chunk_size); |
| 2260 | |
| 2261 | if (target_read (ops, TARGET_OBJECT_MEMORY, NULL, |
| 2262 | &search_buf[keep_len], read_addr, |
| 2263 | nr_to_read) != nr_to_read) |
| 2264 | { |
| 2265 | warning (_("Unable to access %s bytes of target " |
| 2266 | "memory at %s, halting search."), |
| 2267 | plongest (nr_to_read), |
| 2268 | hex_string (read_addr)); |
| 2269 | return -1; |
| 2270 | } |
| 2271 | |
| 2272 | start_addr += chunk_size; |
| 2273 | } |
| 2274 | } |
| 2275 | |
| 2276 | /* Not found. */ |
| 2277 | |
| 2278 | return 0; |
| 2279 | } |
| 2280 | |
| 2281 | /* Default implementation of memory-searching. */ |
| 2282 | |
| 2283 | static int |
| 2284 | default_search_memory (struct target_ops *self, |
| 2285 | CORE_ADDR start_addr, ULONGEST search_space_len, |
| 2286 | const gdb_byte *pattern, ULONGEST pattern_len, |
| 2287 | CORE_ADDR *found_addrp) |
| 2288 | { |
| 2289 | /* Start over from the top of the target stack. */ |
| 2290 | return simple_search_memory (current_top_target (), |
| 2291 | start_addr, search_space_len, |
| 2292 | pattern, pattern_len, found_addrp); |
| 2293 | } |
| 2294 | |
| 2295 | /* Search SEARCH_SPACE_LEN bytes beginning at START_ADDR for the |
| 2296 | sequence of bytes in PATTERN with length PATTERN_LEN. |
| 2297 | |
| 2298 | The result is 1 if found, 0 if not found, and -1 if there was an error |
| 2299 | requiring halting of the search (e.g. memory read error). |
| 2300 | If the pattern is found the address is recorded in FOUND_ADDRP. */ |
| 2301 | |
| 2302 | int |
| 2303 | target_search_memory (CORE_ADDR start_addr, ULONGEST search_space_len, |
| 2304 | const gdb_byte *pattern, ULONGEST pattern_len, |
| 2305 | CORE_ADDR *found_addrp) |
| 2306 | { |
| 2307 | return current_top_target ()->search_memory (start_addr, search_space_len, |
| 2308 | pattern, pattern_len, found_addrp); |
| 2309 | } |
| 2310 | |
| 2311 | /* Look through the currently pushed targets. If none of them will |
| 2312 | be able to restart the currently running process, issue an error |
| 2313 | message. */ |
| 2314 | |
| 2315 | void |
| 2316 | target_require_runnable (void) |
| 2317 | { |
| 2318 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 2319 | { |
| 2320 | /* If this target knows how to create a new program, then |
| 2321 | assume we will still be able to after killing the current |
| 2322 | one. Either killing and mourning will not pop T, or else |
| 2323 | find_default_run_target will find it again. */ |
| 2324 | if (t->can_create_inferior ()) |
| 2325 | return; |
| 2326 | |
| 2327 | /* Do not worry about targets at certain strata that can not |
| 2328 | create inferiors. Assume they will be pushed again if |
| 2329 | necessary, and continue to the process_stratum. */ |
| 2330 | if (t->stratum () > process_stratum) |
| 2331 | continue; |
| 2332 | |
| 2333 | error (_("The \"%s\" target does not support \"run\". " |
| 2334 | "Try \"help target\" or \"continue\"."), |
| 2335 | t->shortname ()); |
| 2336 | } |
| 2337 | |
| 2338 | /* This function is only called if the target is running. In that |
| 2339 | case there should have been a process_stratum target and it |
| 2340 | should either know how to create inferiors, or not... */ |
| 2341 | internal_error (__FILE__, __LINE__, _("No targets found")); |
| 2342 | } |
| 2343 | |
| 2344 | /* Whether GDB is allowed to fall back to the default run target for |
| 2345 | "run", "attach", etc. when no target is connected yet. */ |
| 2346 | static int auto_connect_native_target = 1; |
| 2347 | |
| 2348 | static void |
| 2349 | show_auto_connect_native_target (struct ui_file *file, int from_tty, |
| 2350 | struct cmd_list_element *c, const char *value) |
| 2351 | { |
| 2352 | fprintf_filtered (file, |
| 2353 | _("Whether GDB may automatically connect to the " |
| 2354 | "native target is %s.\n"), |
| 2355 | value); |
| 2356 | } |
| 2357 | |
| 2358 | /* A pointer to the target that can respond to "run" or "attach". |
| 2359 | Native targets are always singletons and instantiated early at GDB |
| 2360 | startup. */ |
| 2361 | static target_ops *the_native_target; |
| 2362 | |
| 2363 | /* See target.h. */ |
| 2364 | |
| 2365 | void |
| 2366 | set_native_target (target_ops *target) |
| 2367 | { |
| 2368 | if (the_native_target != NULL) |
| 2369 | internal_error (__FILE__, __LINE__, |
| 2370 | _("native target already set (\"%s\")."), |
| 2371 | the_native_target->longname ()); |
| 2372 | |
| 2373 | the_native_target = target; |
| 2374 | } |
| 2375 | |
| 2376 | /* See target.h. */ |
| 2377 | |
| 2378 | target_ops * |
| 2379 | get_native_target () |
| 2380 | { |
| 2381 | return the_native_target; |
| 2382 | } |
| 2383 | |
| 2384 | /* Look through the list of possible targets for a target that can |
| 2385 | execute a run or attach command without any other data. This is |
| 2386 | used to locate the default process stratum. |
| 2387 | |
| 2388 | If DO_MESG is not NULL, the result is always valid (error() is |
| 2389 | called for errors); else, return NULL on error. */ |
| 2390 | |
| 2391 | static struct target_ops * |
| 2392 | find_default_run_target (const char *do_mesg) |
| 2393 | { |
| 2394 | if (auto_connect_native_target && the_native_target != NULL) |
| 2395 | return the_native_target; |
| 2396 | |
| 2397 | if (do_mesg != NULL) |
| 2398 | error (_("Don't know how to %s. Try \"help target\"."), do_mesg); |
| 2399 | return NULL; |
| 2400 | } |
| 2401 | |
| 2402 | /* See target.h. */ |
| 2403 | |
| 2404 | struct target_ops * |
| 2405 | find_attach_target (void) |
| 2406 | { |
| 2407 | /* If a target on the current stack can attach, use it. */ |
| 2408 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 2409 | { |
| 2410 | if (t->can_attach ()) |
| 2411 | return t; |
| 2412 | } |
| 2413 | |
| 2414 | /* Otherwise, use the default run target for attaching. */ |
| 2415 | return find_default_run_target ("attach"); |
| 2416 | } |
| 2417 | |
| 2418 | /* See target.h. */ |
| 2419 | |
| 2420 | struct target_ops * |
| 2421 | find_run_target (void) |
| 2422 | { |
| 2423 | /* If a target on the current stack can run, use it. */ |
| 2424 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 2425 | { |
| 2426 | if (t->can_create_inferior ()) |
| 2427 | return t; |
| 2428 | } |
| 2429 | |
| 2430 | /* Otherwise, use the default run target. */ |
| 2431 | return find_default_run_target ("run"); |
| 2432 | } |
| 2433 | |
| 2434 | bool |
| 2435 | target_ops::info_proc (const char *args, enum info_proc_what what) |
| 2436 | { |
| 2437 | return false; |
| 2438 | } |
| 2439 | |
| 2440 | /* Implement the "info proc" command. */ |
| 2441 | |
| 2442 | int |
| 2443 | target_info_proc (const char *args, enum info_proc_what what) |
| 2444 | { |
| 2445 | struct target_ops *t; |
| 2446 | |
| 2447 | /* If we're already connected to something that can get us OS |
| 2448 | related data, use it. Otherwise, try using the native |
| 2449 | target. */ |
| 2450 | t = find_target_at (process_stratum); |
| 2451 | if (t == NULL) |
| 2452 | t = find_default_run_target (NULL); |
| 2453 | |
| 2454 | for (; t != NULL; t = t->beneath ()) |
| 2455 | { |
| 2456 | if (t->info_proc (args, what)) |
| 2457 | { |
| 2458 | if (targetdebug) |
| 2459 | fprintf_unfiltered (gdb_stdlog, |
| 2460 | "target_info_proc (\"%s\", %d)\n", args, what); |
| 2461 | |
| 2462 | return 1; |
| 2463 | } |
| 2464 | } |
| 2465 | |
| 2466 | return 0; |
| 2467 | } |
| 2468 | |
| 2469 | static int |
| 2470 | find_default_supports_disable_randomization (struct target_ops *self) |
| 2471 | { |
| 2472 | struct target_ops *t; |
| 2473 | |
| 2474 | t = find_default_run_target (NULL); |
| 2475 | if (t != NULL) |
| 2476 | return t->supports_disable_randomization (); |
| 2477 | return 0; |
| 2478 | } |
| 2479 | |
| 2480 | int |
| 2481 | target_supports_disable_randomization (void) |
| 2482 | { |
| 2483 | return current_top_target ()->supports_disable_randomization (); |
| 2484 | } |
| 2485 | |
| 2486 | /* See target/target.h. */ |
| 2487 | |
| 2488 | int |
| 2489 | target_supports_multi_process (void) |
| 2490 | { |
| 2491 | return current_top_target ()->supports_multi_process (); |
| 2492 | } |
| 2493 | |
| 2494 | /* See target.h. */ |
| 2495 | |
| 2496 | gdb::optional<gdb::char_vector> |
| 2497 | target_get_osdata (const char *type) |
| 2498 | { |
| 2499 | struct target_ops *t; |
| 2500 | |
| 2501 | /* If we're already connected to something that can get us OS |
| 2502 | related data, use it. Otherwise, try using the native |
| 2503 | target. */ |
| 2504 | t = find_target_at (process_stratum); |
| 2505 | if (t == NULL) |
| 2506 | t = find_default_run_target ("get OS data"); |
| 2507 | |
| 2508 | if (!t) |
| 2509 | return {}; |
| 2510 | |
| 2511 | return target_read_stralloc (t, TARGET_OBJECT_OSDATA, type); |
| 2512 | } |
| 2513 | |
| 2514 | |
| 2515 | /* Determine the current address space of thread PTID. */ |
| 2516 | |
| 2517 | struct address_space * |
| 2518 | target_thread_address_space (ptid_t ptid) |
| 2519 | { |
| 2520 | struct address_space *aspace; |
| 2521 | |
| 2522 | aspace = current_top_target ()->thread_address_space (ptid); |
| 2523 | gdb_assert (aspace != NULL); |
| 2524 | |
| 2525 | return aspace; |
| 2526 | } |
| 2527 | |
| 2528 | /* See target.h. */ |
| 2529 | |
| 2530 | target_ops * |
| 2531 | target_ops::beneath () const |
| 2532 | { |
| 2533 | return g_target_stack.find_beneath (this); |
| 2534 | } |
| 2535 | |
| 2536 | void |
| 2537 | target_ops::close () |
| 2538 | { |
| 2539 | } |
| 2540 | |
| 2541 | bool |
| 2542 | target_ops::can_attach () |
| 2543 | { |
| 2544 | return 0; |
| 2545 | } |
| 2546 | |
| 2547 | void |
| 2548 | target_ops::attach (const char *, int) |
| 2549 | { |
| 2550 | gdb_assert_not_reached ("target_ops::attach called"); |
| 2551 | } |
| 2552 | |
| 2553 | bool |
| 2554 | target_ops::can_create_inferior () |
| 2555 | { |
| 2556 | return 0; |
| 2557 | } |
| 2558 | |
| 2559 | void |
| 2560 | target_ops::create_inferior (const char *, const std::string &, |
| 2561 | char **, int) |
| 2562 | { |
| 2563 | gdb_assert_not_reached ("target_ops::create_inferior called"); |
| 2564 | } |
| 2565 | |
| 2566 | bool |
| 2567 | target_ops::can_run () |
| 2568 | { |
| 2569 | return false; |
| 2570 | } |
| 2571 | |
| 2572 | int |
| 2573 | target_can_run () |
| 2574 | { |
| 2575 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 2576 | { |
| 2577 | if (t->can_run ()) |
| 2578 | return 1; |
| 2579 | } |
| 2580 | |
| 2581 | return 0; |
| 2582 | } |
| 2583 | |
| 2584 | /* Target file operations. */ |
| 2585 | |
| 2586 | static struct target_ops * |
| 2587 | default_fileio_target (void) |
| 2588 | { |
| 2589 | struct target_ops *t; |
| 2590 | |
| 2591 | /* If we're already connected to something that can perform |
| 2592 | file I/O, use it. Otherwise, try using the native target. */ |
| 2593 | t = find_target_at (process_stratum); |
| 2594 | if (t != NULL) |
| 2595 | return t; |
| 2596 | return find_default_run_target ("file I/O"); |
| 2597 | } |
| 2598 | |
| 2599 | /* File handle for target file operations. */ |
| 2600 | |
| 2601 | struct fileio_fh_t |
| 2602 | { |
| 2603 | /* The target on which this file is open. NULL if the target is |
| 2604 | meanwhile closed while the handle is open. */ |
| 2605 | target_ops *target; |
| 2606 | |
| 2607 | /* The file descriptor on the target. */ |
| 2608 | int target_fd; |
| 2609 | |
| 2610 | /* Check whether this fileio_fh_t represents a closed file. */ |
| 2611 | bool is_closed () |
| 2612 | { |
| 2613 | return target_fd < 0; |
| 2614 | } |
| 2615 | }; |
| 2616 | |
| 2617 | /* Vector of currently open file handles. The value returned by |
| 2618 | target_fileio_open and passed as the FD argument to other |
| 2619 | target_fileio_* functions is an index into this vector. This |
| 2620 | vector's entries are never freed; instead, files are marked as |
| 2621 | closed, and the handle becomes available for reuse. */ |
| 2622 | static std::vector<fileio_fh_t> fileio_fhandles; |
| 2623 | |
| 2624 | /* Index into fileio_fhandles of the lowest handle that might be |
| 2625 | closed. This permits handle reuse without searching the whole |
| 2626 | list each time a new file is opened. */ |
| 2627 | static int lowest_closed_fd; |
| 2628 | |
| 2629 | /* Invalidate the target associated with open handles that were open |
| 2630 | on target TARG, since we're about to close (and maybe destroy) the |
| 2631 | target. The handles remain open from the client's perspective, but |
| 2632 | trying to do anything with them other than closing them will fail |
| 2633 | with EIO. */ |
| 2634 | |
| 2635 | static void |
| 2636 | fileio_handles_invalidate_target (target_ops *targ) |
| 2637 | { |
| 2638 | for (fileio_fh_t &fh : fileio_fhandles) |
| 2639 | if (fh.target == targ) |
| 2640 | fh.target = NULL; |
| 2641 | } |
| 2642 | |
| 2643 | /* Acquire a target fileio file descriptor. */ |
| 2644 | |
| 2645 | static int |
| 2646 | acquire_fileio_fd (target_ops *target, int target_fd) |
| 2647 | { |
| 2648 | /* Search for closed handles to reuse. */ |
| 2649 | for (; lowest_closed_fd < fileio_fhandles.size (); lowest_closed_fd++) |
| 2650 | { |
| 2651 | fileio_fh_t &fh = fileio_fhandles[lowest_closed_fd]; |
| 2652 | |
| 2653 | if (fh.is_closed ()) |
| 2654 | break; |
| 2655 | } |
| 2656 | |
| 2657 | /* Push a new handle if no closed handles were found. */ |
| 2658 | if (lowest_closed_fd == fileio_fhandles.size ()) |
| 2659 | fileio_fhandles.push_back (fileio_fh_t {target, target_fd}); |
| 2660 | else |
| 2661 | fileio_fhandles[lowest_closed_fd] = {target, target_fd}; |
| 2662 | |
| 2663 | /* Should no longer be marked closed. */ |
| 2664 | gdb_assert (!fileio_fhandles[lowest_closed_fd].is_closed ()); |
| 2665 | |
| 2666 | /* Return its index, and start the next lookup at |
| 2667 | the next index. */ |
| 2668 | return lowest_closed_fd++; |
| 2669 | } |
| 2670 | |
| 2671 | /* Release a target fileio file descriptor. */ |
| 2672 | |
| 2673 | static void |
| 2674 | release_fileio_fd (int fd, fileio_fh_t *fh) |
| 2675 | { |
| 2676 | fh->target_fd = -1; |
| 2677 | lowest_closed_fd = std::min (lowest_closed_fd, fd); |
| 2678 | } |
| 2679 | |
| 2680 | /* Return a pointer to the fileio_fhandle_t corresponding to FD. */ |
| 2681 | |
| 2682 | static fileio_fh_t * |
| 2683 | fileio_fd_to_fh (int fd) |
| 2684 | { |
| 2685 | return &fileio_fhandles[fd]; |
| 2686 | } |
| 2687 | |
| 2688 | |
| 2689 | /* Default implementations of file i/o methods. We don't want these |
| 2690 | to delegate automatically, because we need to know which target |
| 2691 | supported the method, in order to call it directly from within |
| 2692 | pread/pwrite, etc. */ |
| 2693 | |
| 2694 | int |
| 2695 | target_ops::fileio_open (struct inferior *inf, const char *filename, |
| 2696 | int flags, int mode, int warn_if_slow, |
| 2697 | int *target_errno) |
| 2698 | { |
| 2699 | *target_errno = FILEIO_ENOSYS; |
| 2700 | return -1; |
| 2701 | } |
| 2702 | |
| 2703 | int |
| 2704 | target_ops::fileio_pwrite (int fd, const gdb_byte *write_buf, int len, |
| 2705 | ULONGEST offset, int *target_errno) |
| 2706 | { |
| 2707 | *target_errno = FILEIO_ENOSYS; |
| 2708 | return -1; |
| 2709 | } |
| 2710 | |
| 2711 | int |
| 2712 | target_ops::fileio_pread (int fd, gdb_byte *read_buf, int len, |
| 2713 | ULONGEST offset, int *target_errno) |
| 2714 | { |
| 2715 | *target_errno = FILEIO_ENOSYS; |
| 2716 | return -1; |
| 2717 | } |
| 2718 | |
| 2719 | int |
| 2720 | target_ops::fileio_fstat (int fd, struct stat *sb, int *target_errno) |
| 2721 | { |
| 2722 | *target_errno = FILEIO_ENOSYS; |
| 2723 | return -1; |
| 2724 | } |
| 2725 | |
| 2726 | int |
| 2727 | target_ops::fileio_close (int fd, int *target_errno) |
| 2728 | { |
| 2729 | *target_errno = FILEIO_ENOSYS; |
| 2730 | return -1; |
| 2731 | } |
| 2732 | |
| 2733 | int |
| 2734 | target_ops::fileio_unlink (struct inferior *inf, const char *filename, |
| 2735 | int *target_errno) |
| 2736 | { |
| 2737 | *target_errno = FILEIO_ENOSYS; |
| 2738 | return -1; |
| 2739 | } |
| 2740 | |
| 2741 | gdb::optional<std::string> |
| 2742 | target_ops::fileio_readlink (struct inferior *inf, const char *filename, |
| 2743 | int *target_errno) |
| 2744 | { |
| 2745 | *target_errno = FILEIO_ENOSYS; |
| 2746 | return {}; |
| 2747 | } |
| 2748 | |
| 2749 | /* Helper for target_fileio_open and |
| 2750 | target_fileio_open_warn_if_slow. */ |
| 2751 | |
| 2752 | static int |
| 2753 | target_fileio_open_1 (struct inferior *inf, const char *filename, |
| 2754 | int flags, int mode, int warn_if_slow, |
| 2755 | int *target_errno) |
| 2756 | { |
| 2757 | for (target_ops *t = default_fileio_target (); t != NULL; t = t->beneath ()) |
| 2758 | { |
| 2759 | int fd = t->fileio_open (inf, filename, flags, mode, |
| 2760 | warn_if_slow, target_errno); |
| 2761 | |
| 2762 | if (fd == -1 && *target_errno == FILEIO_ENOSYS) |
| 2763 | continue; |
| 2764 | |
| 2765 | if (fd < 0) |
| 2766 | fd = -1; |
| 2767 | else |
| 2768 | fd = acquire_fileio_fd (t, fd); |
| 2769 | |
| 2770 | if (targetdebug) |
| 2771 | fprintf_unfiltered (gdb_stdlog, |
| 2772 | "target_fileio_open (%d,%s,0x%x,0%o,%d)" |
| 2773 | " = %d (%d)\n", |
| 2774 | inf == NULL ? 0 : inf->num, |
| 2775 | filename, flags, mode, |
| 2776 | warn_if_slow, fd, |
| 2777 | fd != -1 ? 0 : *target_errno); |
| 2778 | return fd; |
| 2779 | } |
| 2780 | |
| 2781 | *target_errno = FILEIO_ENOSYS; |
| 2782 | return -1; |
| 2783 | } |
| 2784 | |
| 2785 | /* See target.h. */ |
| 2786 | |
| 2787 | int |
| 2788 | target_fileio_open (struct inferior *inf, const char *filename, |
| 2789 | int flags, int mode, int *target_errno) |
| 2790 | { |
| 2791 | return target_fileio_open_1 (inf, filename, flags, mode, 0, |
| 2792 | target_errno); |
| 2793 | } |
| 2794 | |
| 2795 | /* See target.h. */ |
| 2796 | |
| 2797 | int |
| 2798 | target_fileio_open_warn_if_slow (struct inferior *inf, |
| 2799 | const char *filename, |
| 2800 | int flags, int mode, int *target_errno) |
| 2801 | { |
| 2802 | return target_fileio_open_1 (inf, filename, flags, mode, 1, |
| 2803 | target_errno); |
| 2804 | } |
| 2805 | |
| 2806 | /* See target.h. */ |
| 2807 | |
| 2808 | int |
| 2809 | target_fileio_pwrite (int fd, const gdb_byte *write_buf, int len, |
| 2810 | ULONGEST offset, int *target_errno) |
| 2811 | { |
| 2812 | fileio_fh_t *fh = fileio_fd_to_fh (fd); |
| 2813 | int ret = -1; |
| 2814 | |
| 2815 | if (fh->is_closed ()) |
| 2816 | *target_errno = EBADF; |
| 2817 | else if (fh->target == NULL) |
| 2818 | *target_errno = EIO; |
| 2819 | else |
| 2820 | ret = fh->target->fileio_pwrite (fh->target_fd, write_buf, |
| 2821 | len, offset, target_errno); |
| 2822 | |
| 2823 | if (targetdebug) |
| 2824 | fprintf_unfiltered (gdb_stdlog, |
| 2825 | "target_fileio_pwrite (%d,...,%d,%s) " |
| 2826 | "= %d (%d)\n", |
| 2827 | fd, len, pulongest (offset), |
| 2828 | ret, ret != -1 ? 0 : *target_errno); |
| 2829 | return ret; |
| 2830 | } |
| 2831 | |
| 2832 | /* See target.h. */ |
| 2833 | |
| 2834 | int |
| 2835 | target_fileio_pread (int fd, gdb_byte *read_buf, int len, |
| 2836 | ULONGEST offset, int *target_errno) |
| 2837 | { |
| 2838 | fileio_fh_t *fh = fileio_fd_to_fh (fd); |
| 2839 | int ret = -1; |
| 2840 | |
| 2841 | if (fh->is_closed ()) |
| 2842 | *target_errno = EBADF; |
| 2843 | else if (fh->target == NULL) |
| 2844 | *target_errno = EIO; |
| 2845 | else |
| 2846 | ret = fh->target->fileio_pread (fh->target_fd, read_buf, |
| 2847 | len, offset, target_errno); |
| 2848 | |
| 2849 | if (targetdebug) |
| 2850 | fprintf_unfiltered (gdb_stdlog, |
| 2851 | "target_fileio_pread (%d,...,%d,%s) " |
| 2852 | "= %d (%d)\n", |
| 2853 | fd, len, pulongest (offset), |
| 2854 | ret, ret != -1 ? 0 : *target_errno); |
| 2855 | return ret; |
| 2856 | } |
| 2857 | |
| 2858 | /* See target.h. */ |
| 2859 | |
| 2860 | int |
| 2861 | target_fileio_fstat (int fd, struct stat *sb, int *target_errno) |
| 2862 | { |
| 2863 | fileio_fh_t *fh = fileio_fd_to_fh (fd); |
| 2864 | int ret = -1; |
| 2865 | |
| 2866 | if (fh->is_closed ()) |
| 2867 | *target_errno = EBADF; |
| 2868 | else if (fh->target == NULL) |
| 2869 | *target_errno = EIO; |
| 2870 | else |
| 2871 | ret = fh->target->fileio_fstat (fh->target_fd, sb, target_errno); |
| 2872 | |
| 2873 | if (targetdebug) |
| 2874 | fprintf_unfiltered (gdb_stdlog, |
| 2875 | "target_fileio_fstat (%d) = %d (%d)\n", |
| 2876 | fd, ret, ret != -1 ? 0 : *target_errno); |
| 2877 | return ret; |
| 2878 | } |
| 2879 | |
| 2880 | /* See target.h. */ |
| 2881 | |
| 2882 | int |
| 2883 | target_fileio_close (int fd, int *target_errno) |
| 2884 | { |
| 2885 | fileio_fh_t *fh = fileio_fd_to_fh (fd); |
| 2886 | int ret = -1; |
| 2887 | |
| 2888 | if (fh->is_closed ()) |
| 2889 | *target_errno = EBADF; |
| 2890 | else |
| 2891 | { |
| 2892 | if (fh->target != NULL) |
| 2893 | ret = fh->target->fileio_close (fh->target_fd, |
| 2894 | target_errno); |
| 2895 | else |
| 2896 | ret = 0; |
| 2897 | release_fileio_fd (fd, fh); |
| 2898 | } |
| 2899 | |
| 2900 | if (targetdebug) |
| 2901 | fprintf_unfiltered (gdb_stdlog, |
| 2902 | "target_fileio_close (%d) = %d (%d)\n", |
| 2903 | fd, ret, ret != -1 ? 0 : *target_errno); |
| 2904 | return ret; |
| 2905 | } |
| 2906 | |
| 2907 | /* See target.h. */ |
| 2908 | |
| 2909 | int |
| 2910 | target_fileio_unlink (struct inferior *inf, const char *filename, |
| 2911 | int *target_errno) |
| 2912 | { |
| 2913 | for (target_ops *t = default_fileio_target (); t != NULL; t = t->beneath ()) |
| 2914 | { |
| 2915 | int ret = t->fileio_unlink (inf, filename, target_errno); |
| 2916 | |
| 2917 | if (ret == -1 && *target_errno == FILEIO_ENOSYS) |
| 2918 | continue; |
| 2919 | |
| 2920 | if (targetdebug) |
| 2921 | fprintf_unfiltered (gdb_stdlog, |
| 2922 | "target_fileio_unlink (%d,%s)" |
| 2923 | " = %d (%d)\n", |
| 2924 | inf == NULL ? 0 : inf->num, filename, |
| 2925 | ret, ret != -1 ? 0 : *target_errno); |
| 2926 | return ret; |
| 2927 | } |
| 2928 | |
| 2929 | *target_errno = FILEIO_ENOSYS; |
| 2930 | return -1; |
| 2931 | } |
| 2932 | |
| 2933 | /* See target.h. */ |
| 2934 | |
| 2935 | gdb::optional<std::string> |
| 2936 | target_fileio_readlink (struct inferior *inf, const char *filename, |
| 2937 | int *target_errno) |
| 2938 | { |
| 2939 | for (target_ops *t = default_fileio_target (); t != NULL; t = t->beneath ()) |
| 2940 | { |
| 2941 | gdb::optional<std::string> ret |
| 2942 | = t->fileio_readlink (inf, filename, target_errno); |
| 2943 | |
| 2944 | if (!ret.has_value () && *target_errno == FILEIO_ENOSYS) |
| 2945 | continue; |
| 2946 | |
| 2947 | if (targetdebug) |
| 2948 | fprintf_unfiltered (gdb_stdlog, |
| 2949 | "target_fileio_readlink (%d,%s)" |
| 2950 | " = %s (%d)\n", |
| 2951 | inf == NULL ? 0 : inf->num, |
| 2952 | filename, ret ? ret->c_str () : "(nil)", |
| 2953 | ret ? 0 : *target_errno); |
| 2954 | return ret; |
| 2955 | } |
| 2956 | |
| 2957 | *target_errno = FILEIO_ENOSYS; |
| 2958 | return {}; |
| 2959 | } |
| 2960 | |
| 2961 | /* Like scoped_fd, but specific to target fileio. */ |
| 2962 | |
| 2963 | class scoped_target_fd |
| 2964 | { |
| 2965 | public: |
| 2966 | explicit scoped_target_fd (int fd) noexcept |
| 2967 | : m_fd (fd) |
| 2968 | { |
| 2969 | } |
| 2970 | |
| 2971 | ~scoped_target_fd () |
| 2972 | { |
| 2973 | if (m_fd >= 0) |
| 2974 | { |
| 2975 | int target_errno; |
| 2976 | |
| 2977 | target_fileio_close (m_fd, &target_errno); |
| 2978 | } |
| 2979 | } |
| 2980 | |
| 2981 | DISABLE_COPY_AND_ASSIGN (scoped_target_fd); |
| 2982 | |
| 2983 | int get () const noexcept |
| 2984 | { |
| 2985 | return m_fd; |
| 2986 | } |
| 2987 | |
| 2988 | private: |
| 2989 | int m_fd; |
| 2990 | }; |
| 2991 | |
| 2992 | /* Read target file FILENAME, in the filesystem as seen by INF. If |
| 2993 | INF is NULL, use the filesystem seen by the debugger (GDB or, for |
| 2994 | remote targets, the remote stub). Store the result in *BUF_P and |
| 2995 | return the size of the transferred data. PADDING additional bytes |
| 2996 | are available in *BUF_P. This is a helper function for |
| 2997 | target_fileio_read_alloc; see the declaration of that function for |
| 2998 | more information. */ |
| 2999 | |
| 3000 | static LONGEST |
| 3001 | target_fileio_read_alloc_1 (struct inferior *inf, const char *filename, |
| 3002 | gdb_byte **buf_p, int padding) |
| 3003 | { |
| 3004 | size_t buf_alloc, buf_pos; |
| 3005 | gdb_byte *buf; |
| 3006 | LONGEST n; |
| 3007 | int target_errno; |
| 3008 | |
| 3009 | scoped_target_fd fd (target_fileio_open (inf, filename, FILEIO_O_RDONLY, |
| 3010 | 0700, &target_errno)); |
| 3011 | if (fd.get () == -1) |
| 3012 | return -1; |
| 3013 | |
| 3014 | /* Start by reading up to 4K at a time. The target will throttle |
| 3015 | this number down if necessary. */ |
| 3016 | buf_alloc = 4096; |
| 3017 | buf = (gdb_byte *) xmalloc (buf_alloc); |
| 3018 | buf_pos = 0; |
| 3019 | while (1) |
| 3020 | { |
| 3021 | n = target_fileio_pread (fd.get (), &buf[buf_pos], |
| 3022 | buf_alloc - buf_pos - padding, buf_pos, |
| 3023 | &target_errno); |
| 3024 | if (n < 0) |
| 3025 | { |
| 3026 | /* An error occurred. */ |
| 3027 | xfree (buf); |
| 3028 | return -1; |
| 3029 | } |
| 3030 | else if (n == 0) |
| 3031 | { |
| 3032 | /* Read all there was. */ |
| 3033 | if (buf_pos == 0) |
| 3034 | xfree (buf); |
| 3035 | else |
| 3036 | *buf_p = buf; |
| 3037 | return buf_pos; |
| 3038 | } |
| 3039 | |
| 3040 | buf_pos += n; |
| 3041 | |
| 3042 | /* If the buffer is filling up, expand it. */ |
| 3043 | if (buf_alloc < buf_pos * 2) |
| 3044 | { |
| 3045 | buf_alloc *= 2; |
| 3046 | buf = (gdb_byte *) xrealloc (buf, buf_alloc); |
| 3047 | } |
| 3048 | |
| 3049 | QUIT; |
| 3050 | } |
| 3051 | } |
| 3052 | |
| 3053 | /* See target.h. */ |
| 3054 | |
| 3055 | LONGEST |
| 3056 | target_fileio_read_alloc (struct inferior *inf, const char *filename, |
| 3057 | gdb_byte **buf_p) |
| 3058 | { |
| 3059 | return target_fileio_read_alloc_1 (inf, filename, buf_p, 0); |
| 3060 | } |
| 3061 | |
| 3062 | /* See target.h. */ |
| 3063 | |
| 3064 | gdb::unique_xmalloc_ptr<char> |
| 3065 | target_fileio_read_stralloc (struct inferior *inf, const char *filename) |
| 3066 | { |
| 3067 | gdb_byte *buffer; |
| 3068 | char *bufstr; |
| 3069 | LONGEST i, transferred; |
| 3070 | |
| 3071 | transferred = target_fileio_read_alloc_1 (inf, filename, &buffer, 1); |
| 3072 | bufstr = (char *) buffer; |
| 3073 | |
| 3074 | if (transferred < 0) |
| 3075 | return gdb::unique_xmalloc_ptr<char> (nullptr); |
| 3076 | |
| 3077 | if (transferred == 0) |
| 3078 | return gdb::unique_xmalloc_ptr<char> (xstrdup ("")); |
| 3079 | |
| 3080 | bufstr[transferred] = 0; |
| 3081 | |
| 3082 | /* Check for embedded NUL bytes; but allow trailing NULs. */ |
| 3083 | for (i = strlen (bufstr); i < transferred; i++) |
| 3084 | if (bufstr[i] != 0) |
| 3085 | { |
| 3086 | warning (_("target file %s " |
| 3087 | "contained unexpected null characters"), |
| 3088 | filename); |
| 3089 | break; |
| 3090 | } |
| 3091 | |
| 3092 | return gdb::unique_xmalloc_ptr<char> (bufstr); |
| 3093 | } |
| 3094 | |
| 3095 | |
| 3096 | static int |
| 3097 | default_region_ok_for_hw_watchpoint (struct target_ops *self, |
| 3098 | CORE_ADDR addr, int len) |
| 3099 | { |
| 3100 | return (len <= gdbarch_ptr_bit (target_gdbarch ()) / TARGET_CHAR_BIT); |
| 3101 | } |
| 3102 | |
| 3103 | static int |
| 3104 | default_watchpoint_addr_within_range (struct target_ops *target, |
| 3105 | CORE_ADDR addr, |
| 3106 | CORE_ADDR start, int length) |
| 3107 | { |
| 3108 | return addr >= start && addr < start + length; |
| 3109 | } |
| 3110 | |
| 3111 | /* See target.h. */ |
| 3112 | |
| 3113 | target_ops * |
| 3114 | target_stack::find_beneath (const target_ops *t) const |
| 3115 | { |
| 3116 | /* Look for a non-empty slot at stratum levels beneath T's. */ |
| 3117 | for (int stratum = t->stratum () - 1; stratum >= 0; --stratum) |
| 3118 | if (m_stack[stratum] != NULL) |
| 3119 | return m_stack[stratum]; |
| 3120 | |
| 3121 | return NULL; |
| 3122 | } |
| 3123 | |
| 3124 | /* See target.h. */ |
| 3125 | |
| 3126 | struct target_ops * |
| 3127 | find_target_at (enum strata stratum) |
| 3128 | { |
| 3129 | return g_target_stack.at (stratum); |
| 3130 | } |
| 3131 | |
| 3132 | \f |
| 3133 | |
| 3134 | /* See target.h */ |
| 3135 | |
| 3136 | void |
| 3137 | target_announce_detach (int from_tty) |
| 3138 | { |
| 3139 | pid_t pid; |
| 3140 | const char *exec_file; |
| 3141 | |
| 3142 | if (!from_tty) |
| 3143 | return; |
| 3144 | |
| 3145 | exec_file = get_exec_file (0); |
| 3146 | if (exec_file == NULL) |
| 3147 | exec_file = ""; |
| 3148 | |
| 3149 | pid = inferior_ptid.pid (); |
| 3150 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
| 3151 | target_pid_to_str (ptid_t (pid))); |
| 3152 | gdb_flush (gdb_stdout); |
| 3153 | } |
| 3154 | |
| 3155 | /* The inferior process has died. Long live the inferior! */ |
| 3156 | |
| 3157 | void |
| 3158 | generic_mourn_inferior (void) |
| 3159 | { |
| 3160 | inferior *inf = current_inferior (); |
| 3161 | |
| 3162 | inferior_ptid = null_ptid; |
| 3163 | |
| 3164 | /* Mark breakpoints uninserted in case something tries to delete a |
| 3165 | breakpoint while we delete the inferior's threads (which would |
| 3166 | fail, since the inferior is long gone). */ |
| 3167 | mark_breakpoints_out (); |
| 3168 | |
| 3169 | if (inf->pid != 0) |
| 3170 | exit_inferior (inf); |
| 3171 | |
| 3172 | /* Note this wipes step-resume breakpoints, so needs to be done |
| 3173 | after exit_inferior, which ends up referencing the step-resume |
| 3174 | breakpoints through clear_thread_inferior_resources. */ |
| 3175 | breakpoint_init_inferior (inf_exited); |
| 3176 | |
| 3177 | registers_changed (); |
| 3178 | |
| 3179 | reopen_exec_file (); |
| 3180 | reinit_frame_cache (); |
| 3181 | |
| 3182 | if (deprecated_detach_hook) |
| 3183 | deprecated_detach_hook (); |
| 3184 | } |
| 3185 | \f |
| 3186 | /* Convert a normal process ID to a string. Returns the string in a |
| 3187 | static buffer. */ |
| 3188 | |
| 3189 | const char * |
| 3190 | normal_pid_to_str (ptid_t ptid) |
| 3191 | { |
| 3192 | static char buf[32]; |
| 3193 | |
| 3194 | xsnprintf (buf, sizeof buf, "process %d", ptid.pid ()); |
| 3195 | return buf; |
| 3196 | } |
| 3197 | |
| 3198 | static const char * |
| 3199 | default_pid_to_str (struct target_ops *ops, ptid_t ptid) |
| 3200 | { |
| 3201 | return normal_pid_to_str (ptid); |
| 3202 | } |
| 3203 | |
| 3204 | /* Error-catcher for target_find_memory_regions. */ |
| 3205 | static int |
| 3206 | dummy_find_memory_regions (struct target_ops *self, |
| 3207 | find_memory_region_ftype ignore1, void *ignore2) |
| 3208 | { |
| 3209 | error (_("Command not implemented for this target.")); |
| 3210 | return 0; |
| 3211 | } |
| 3212 | |
| 3213 | /* Error-catcher for target_make_corefile_notes. */ |
| 3214 | static char * |
| 3215 | dummy_make_corefile_notes (struct target_ops *self, |
| 3216 | bfd *ignore1, int *ignore2) |
| 3217 | { |
| 3218 | error (_("Command not implemented for this target.")); |
| 3219 | return NULL; |
| 3220 | } |
| 3221 | |
| 3222 | #include "target-delegates.c" |
| 3223 | |
| 3224 | |
| 3225 | static const target_info dummy_target_info = { |
| 3226 | "None", |
| 3227 | N_("None"), |
| 3228 | "" |
| 3229 | }; |
| 3230 | |
| 3231 | strata |
| 3232 | dummy_target::stratum () const |
| 3233 | { |
| 3234 | return dummy_stratum; |
| 3235 | } |
| 3236 | |
| 3237 | strata |
| 3238 | debug_target::stratum () const |
| 3239 | { |
| 3240 | return debug_stratum; |
| 3241 | } |
| 3242 | |
| 3243 | const target_info & |
| 3244 | dummy_target::info () const |
| 3245 | { |
| 3246 | return dummy_target_info; |
| 3247 | } |
| 3248 | |
| 3249 | const target_info & |
| 3250 | debug_target::info () const |
| 3251 | { |
| 3252 | return beneath ()->info (); |
| 3253 | } |
| 3254 | |
| 3255 | \f |
| 3256 | |
| 3257 | void |
| 3258 | target_close (struct target_ops *targ) |
| 3259 | { |
| 3260 | gdb_assert (!target_is_pushed (targ)); |
| 3261 | |
| 3262 | fileio_handles_invalidate_target (targ); |
| 3263 | |
| 3264 | targ->close (); |
| 3265 | |
| 3266 | if (targetdebug) |
| 3267 | fprintf_unfiltered (gdb_stdlog, "target_close ()\n"); |
| 3268 | } |
| 3269 | |
| 3270 | int |
| 3271 | target_thread_alive (ptid_t ptid) |
| 3272 | { |
| 3273 | return current_top_target ()->thread_alive (ptid); |
| 3274 | } |
| 3275 | |
| 3276 | void |
| 3277 | target_update_thread_list (void) |
| 3278 | { |
| 3279 | current_top_target ()->update_thread_list (); |
| 3280 | } |
| 3281 | |
| 3282 | void |
| 3283 | target_stop (ptid_t ptid) |
| 3284 | { |
| 3285 | if (!may_stop) |
| 3286 | { |
| 3287 | warning (_("May not interrupt or stop the target, ignoring attempt")); |
| 3288 | return; |
| 3289 | } |
| 3290 | |
| 3291 | current_top_target ()->stop (ptid); |
| 3292 | } |
| 3293 | |
| 3294 | void |
| 3295 | target_interrupt () |
| 3296 | { |
| 3297 | if (!may_stop) |
| 3298 | { |
| 3299 | warning (_("May not interrupt or stop the target, ignoring attempt")); |
| 3300 | return; |
| 3301 | } |
| 3302 | |
| 3303 | current_top_target ()->interrupt (); |
| 3304 | } |
| 3305 | |
| 3306 | /* See target.h. */ |
| 3307 | |
| 3308 | void |
| 3309 | target_pass_ctrlc (void) |
| 3310 | { |
| 3311 | current_top_target ()->pass_ctrlc (); |
| 3312 | } |
| 3313 | |
| 3314 | /* See target.h. */ |
| 3315 | |
| 3316 | void |
| 3317 | default_target_pass_ctrlc (struct target_ops *ops) |
| 3318 | { |
| 3319 | target_interrupt (); |
| 3320 | } |
| 3321 | |
| 3322 | /* See target/target.h. */ |
| 3323 | |
| 3324 | void |
| 3325 | target_stop_and_wait (ptid_t ptid) |
| 3326 | { |
| 3327 | struct target_waitstatus status; |
| 3328 | int was_non_stop = non_stop; |
| 3329 | |
| 3330 | non_stop = 1; |
| 3331 | target_stop (ptid); |
| 3332 | |
| 3333 | memset (&status, 0, sizeof (status)); |
| 3334 | target_wait (ptid, &status, 0); |
| 3335 | |
| 3336 | non_stop = was_non_stop; |
| 3337 | } |
| 3338 | |
| 3339 | /* See target/target.h. */ |
| 3340 | |
| 3341 | void |
| 3342 | target_continue_no_signal (ptid_t ptid) |
| 3343 | { |
| 3344 | target_resume (ptid, 0, GDB_SIGNAL_0); |
| 3345 | } |
| 3346 | |
| 3347 | /* See target/target.h. */ |
| 3348 | |
| 3349 | void |
| 3350 | target_continue (ptid_t ptid, enum gdb_signal signal) |
| 3351 | { |
| 3352 | target_resume (ptid, 0, signal); |
| 3353 | } |
| 3354 | |
| 3355 | /* Concatenate ELEM to LIST, a comma-separated list. */ |
| 3356 | |
| 3357 | static void |
| 3358 | str_comma_list_concat_elem (std::string *list, const char *elem) |
| 3359 | { |
| 3360 | if (!list->empty ()) |
| 3361 | list->append (", "); |
| 3362 | |
| 3363 | list->append (elem); |
| 3364 | } |
| 3365 | |
| 3366 | /* Helper for target_options_to_string. If OPT is present in |
| 3367 | TARGET_OPTIONS, append the OPT_STR (string version of OPT) in RET. |
| 3368 | OPT is removed from TARGET_OPTIONS. */ |
| 3369 | |
| 3370 | static void |
| 3371 | do_option (int *target_options, std::string *ret, |
| 3372 | int opt, const char *opt_str) |
| 3373 | { |
| 3374 | if ((*target_options & opt) != 0) |
| 3375 | { |
| 3376 | str_comma_list_concat_elem (ret, opt_str); |
| 3377 | *target_options &= ~opt; |
| 3378 | } |
| 3379 | } |
| 3380 | |
| 3381 | /* See target.h. */ |
| 3382 | |
| 3383 | std::string |
| 3384 | target_options_to_string (int target_options) |
| 3385 | { |
| 3386 | std::string ret; |
| 3387 | |
| 3388 | #define DO_TARG_OPTION(OPT) \ |
| 3389 | do_option (&target_options, &ret, OPT, #OPT) |
| 3390 | |
| 3391 | DO_TARG_OPTION (TARGET_WNOHANG); |
| 3392 | |
| 3393 | if (target_options != 0) |
| 3394 | str_comma_list_concat_elem (&ret, "unknown???"); |
| 3395 | |
| 3396 | return ret; |
| 3397 | } |
| 3398 | |
| 3399 | void |
| 3400 | target_fetch_registers (struct regcache *regcache, int regno) |
| 3401 | { |
| 3402 | current_top_target ()->fetch_registers (regcache, regno); |
| 3403 | if (targetdebug) |
| 3404 | regcache->debug_print_register ("target_fetch_registers", regno); |
| 3405 | } |
| 3406 | |
| 3407 | void |
| 3408 | target_store_registers (struct regcache *regcache, int regno) |
| 3409 | { |
| 3410 | if (!may_write_registers) |
| 3411 | error (_("Writing to registers is not allowed (regno %d)"), regno); |
| 3412 | |
| 3413 | current_top_target ()->store_registers (regcache, regno); |
| 3414 | if (targetdebug) |
| 3415 | { |
| 3416 | regcache->debug_print_register ("target_store_registers", regno); |
| 3417 | } |
| 3418 | } |
| 3419 | |
| 3420 | int |
| 3421 | target_core_of_thread (ptid_t ptid) |
| 3422 | { |
| 3423 | return current_top_target ()->core_of_thread (ptid); |
| 3424 | } |
| 3425 | |
| 3426 | int |
| 3427 | simple_verify_memory (struct target_ops *ops, |
| 3428 | const gdb_byte *data, CORE_ADDR lma, ULONGEST size) |
| 3429 | { |
| 3430 | LONGEST total_xfered = 0; |
| 3431 | |
| 3432 | while (total_xfered < size) |
| 3433 | { |
| 3434 | ULONGEST xfered_len; |
| 3435 | enum target_xfer_status status; |
| 3436 | gdb_byte buf[1024]; |
| 3437 | ULONGEST howmuch = std::min<ULONGEST> (sizeof (buf), size - total_xfered); |
| 3438 | |
| 3439 | status = target_xfer_partial (ops, TARGET_OBJECT_MEMORY, NULL, |
| 3440 | buf, NULL, lma + total_xfered, howmuch, |
| 3441 | &xfered_len); |
| 3442 | if (status == TARGET_XFER_OK |
| 3443 | && memcmp (data + total_xfered, buf, xfered_len) == 0) |
| 3444 | { |
| 3445 | total_xfered += xfered_len; |
| 3446 | QUIT; |
| 3447 | } |
| 3448 | else |
| 3449 | return 0; |
| 3450 | } |
| 3451 | return 1; |
| 3452 | } |
| 3453 | |
| 3454 | /* Default implementation of memory verification. */ |
| 3455 | |
| 3456 | static int |
| 3457 | default_verify_memory (struct target_ops *self, |
| 3458 | const gdb_byte *data, CORE_ADDR memaddr, ULONGEST size) |
| 3459 | { |
| 3460 | /* Start over from the top of the target stack. */ |
| 3461 | return simple_verify_memory (current_top_target (), |
| 3462 | data, memaddr, size); |
| 3463 | } |
| 3464 | |
| 3465 | int |
| 3466 | target_verify_memory (const gdb_byte *data, CORE_ADDR memaddr, ULONGEST size) |
| 3467 | { |
| 3468 | return current_top_target ()->verify_memory (data, memaddr, size); |
| 3469 | } |
| 3470 | |
| 3471 | /* The documentation for this function is in its prototype declaration in |
| 3472 | target.h. */ |
| 3473 | |
| 3474 | int |
| 3475 | target_insert_mask_watchpoint (CORE_ADDR addr, CORE_ADDR mask, |
| 3476 | enum target_hw_bp_type rw) |
| 3477 | { |
| 3478 | return current_top_target ()->insert_mask_watchpoint (addr, mask, rw); |
| 3479 | } |
| 3480 | |
| 3481 | /* The documentation for this function is in its prototype declaration in |
| 3482 | target.h. */ |
| 3483 | |
| 3484 | int |
| 3485 | target_remove_mask_watchpoint (CORE_ADDR addr, CORE_ADDR mask, |
| 3486 | enum target_hw_bp_type rw) |
| 3487 | { |
| 3488 | return current_top_target ()->remove_mask_watchpoint (addr, mask, rw); |
| 3489 | } |
| 3490 | |
| 3491 | /* The documentation for this function is in its prototype declaration |
| 3492 | in target.h. */ |
| 3493 | |
| 3494 | int |
| 3495 | target_masked_watch_num_registers (CORE_ADDR addr, CORE_ADDR mask) |
| 3496 | { |
| 3497 | return current_top_target ()->masked_watch_num_registers (addr, mask); |
| 3498 | } |
| 3499 | |
| 3500 | /* The documentation for this function is in its prototype declaration |
| 3501 | in target.h. */ |
| 3502 | |
| 3503 | int |
| 3504 | target_ranged_break_num_registers (void) |
| 3505 | { |
| 3506 | return current_top_target ()->ranged_break_num_registers (); |
| 3507 | } |
| 3508 | |
| 3509 | /* See target.h. */ |
| 3510 | |
| 3511 | struct btrace_target_info * |
| 3512 | target_enable_btrace (ptid_t ptid, const struct btrace_config *conf) |
| 3513 | { |
| 3514 | return current_top_target ()->enable_btrace (ptid, conf); |
| 3515 | } |
| 3516 | |
| 3517 | /* See target.h. */ |
| 3518 | |
| 3519 | void |
| 3520 | target_disable_btrace (struct btrace_target_info *btinfo) |
| 3521 | { |
| 3522 | current_top_target ()->disable_btrace (btinfo); |
| 3523 | } |
| 3524 | |
| 3525 | /* See target.h. */ |
| 3526 | |
| 3527 | void |
| 3528 | target_teardown_btrace (struct btrace_target_info *btinfo) |
| 3529 | { |
| 3530 | current_top_target ()->teardown_btrace (btinfo); |
| 3531 | } |
| 3532 | |
| 3533 | /* See target.h. */ |
| 3534 | |
| 3535 | enum btrace_error |
| 3536 | target_read_btrace (struct btrace_data *btrace, |
| 3537 | struct btrace_target_info *btinfo, |
| 3538 | enum btrace_read_type type) |
| 3539 | { |
| 3540 | return current_top_target ()->read_btrace (btrace, btinfo, type); |
| 3541 | } |
| 3542 | |
| 3543 | /* See target.h. */ |
| 3544 | |
| 3545 | const struct btrace_config * |
| 3546 | target_btrace_conf (const struct btrace_target_info *btinfo) |
| 3547 | { |
| 3548 | return current_top_target ()->btrace_conf (btinfo); |
| 3549 | } |
| 3550 | |
| 3551 | /* See target.h. */ |
| 3552 | |
| 3553 | void |
| 3554 | target_stop_recording (void) |
| 3555 | { |
| 3556 | current_top_target ()->stop_recording (); |
| 3557 | } |
| 3558 | |
| 3559 | /* See target.h. */ |
| 3560 | |
| 3561 | void |
| 3562 | target_save_record (const char *filename) |
| 3563 | { |
| 3564 | current_top_target ()->save_record (filename); |
| 3565 | } |
| 3566 | |
| 3567 | /* See target.h. */ |
| 3568 | |
| 3569 | int |
| 3570 | target_supports_delete_record () |
| 3571 | { |
| 3572 | return current_top_target ()->supports_delete_record (); |
| 3573 | } |
| 3574 | |
| 3575 | /* See target.h. */ |
| 3576 | |
| 3577 | void |
| 3578 | target_delete_record (void) |
| 3579 | { |
| 3580 | current_top_target ()->delete_record (); |
| 3581 | } |
| 3582 | |
| 3583 | /* See target.h. */ |
| 3584 | |
| 3585 | enum record_method |
| 3586 | target_record_method (ptid_t ptid) |
| 3587 | { |
| 3588 | return current_top_target ()->record_method (ptid); |
| 3589 | } |
| 3590 | |
| 3591 | /* See target.h. */ |
| 3592 | |
| 3593 | int |
| 3594 | target_record_is_replaying (ptid_t ptid) |
| 3595 | { |
| 3596 | return current_top_target ()->record_is_replaying (ptid); |
| 3597 | } |
| 3598 | |
| 3599 | /* See target.h. */ |
| 3600 | |
| 3601 | int |
| 3602 | target_record_will_replay (ptid_t ptid, int dir) |
| 3603 | { |
| 3604 | return current_top_target ()->record_will_replay (ptid, dir); |
| 3605 | } |
| 3606 | |
| 3607 | /* See target.h. */ |
| 3608 | |
| 3609 | void |
| 3610 | target_record_stop_replaying (void) |
| 3611 | { |
| 3612 | current_top_target ()->record_stop_replaying (); |
| 3613 | } |
| 3614 | |
| 3615 | /* See target.h. */ |
| 3616 | |
| 3617 | void |
| 3618 | target_goto_record_begin (void) |
| 3619 | { |
| 3620 | current_top_target ()->goto_record_begin (); |
| 3621 | } |
| 3622 | |
| 3623 | /* See target.h. */ |
| 3624 | |
| 3625 | void |
| 3626 | target_goto_record_end (void) |
| 3627 | { |
| 3628 | current_top_target ()->goto_record_end (); |
| 3629 | } |
| 3630 | |
| 3631 | /* See target.h. */ |
| 3632 | |
| 3633 | void |
| 3634 | target_goto_record (ULONGEST insn) |
| 3635 | { |
| 3636 | current_top_target ()->goto_record (insn); |
| 3637 | } |
| 3638 | |
| 3639 | /* See target.h. */ |
| 3640 | |
| 3641 | void |
| 3642 | target_insn_history (int size, gdb_disassembly_flags flags) |
| 3643 | { |
| 3644 | current_top_target ()->insn_history (size, flags); |
| 3645 | } |
| 3646 | |
| 3647 | /* See target.h. */ |
| 3648 | |
| 3649 | void |
| 3650 | target_insn_history_from (ULONGEST from, int size, |
| 3651 | gdb_disassembly_flags flags) |
| 3652 | { |
| 3653 | current_top_target ()->insn_history_from (from, size, flags); |
| 3654 | } |
| 3655 | |
| 3656 | /* See target.h. */ |
| 3657 | |
| 3658 | void |
| 3659 | target_insn_history_range (ULONGEST begin, ULONGEST end, |
| 3660 | gdb_disassembly_flags flags) |
| 3661 | { |
| 3662 | current_top_target ()->insn_history_range (begin, end, flags); |
| 3663 | } |
| 3664 | |
| 3665 | /* See target.h. */ |
| 3666 | |
| 3667 | void |
| 3668 | target_call_history (int size, record_print_flags flags) |
| 3669 | { |
| 3670 | current_top_target ()->call_history (size, flags); |
| 3671 | } |
| 3672 | |
| 3673 | /* See target.h. */ |
| 3674 | |
| 3675 | void |
| 3676 | target_call_history_from (ULONGEST begin, int size, record_print_flags flags) |
| 3677 | { |
| 3678 | current_top_target ()->call_history_from (begin, size, flags); |
| 3679 | } |
| 3680 | |
| 3681 | /* See target.h. */ |
| 3682 | |
| 3683 | void |
| 3684 | target_call_history_range (ULONGEST begin, ULONGEST end, record_print_flags flags) |
| 3685 | { |
| 3686 | current_top_target ()->call_history_range (begin, end, flags); |
| 3687 | } |
| 3688 | |
| 3689 | /* See target.h. */ |
| 3690 | |
| 3691 | const struct frame_unwind * |
| 3692 | target_get_unwinder (void) |
| 3693 | { |
| 3694 | return current_top_target ()->get_unwinder (); |
| 3695 | } |
| 3696 | |
| 3697 | /* See target.h. */ |
| 3698 | |
| 3699 | const struct frame_unwind * |
| 3700 | target_get_tailcall_unwinder (void) |
| 3701 | { |
| 3702 | return current_top_target ()->get_tailcall_unwinder (); |
| 3703 | } |
| 3704 | |
| 3705 | /* See target.h. */ |
| 3706 | |
| 3707 | void |
| 3708 | target_prepare_to_generate_core (void) |
| 3709 | { |
| 3710 | current_top_target ()->prepare_to_generate_core (); |
| 3711 | } |
| 3712 | |
| 3713 | /* See target.h. */ |
| 3714 | |
| 3715 | void |
| 3716 | target_done_generating_core (void) |
| 3717 | { |
| 3718 | current_top_target ()->done_generating_core (); |
| 3719 | } |
| 3720 | |
| 3721 | \f |
| 3722 | |
| 3723 | static char targ_desc[] = |
| 3724 | "Names of targets and files being debugged.\nShows the entire \ |
| 3725 | stack of targets currently in use (including the exec-file,\n\ |
| 3726 | core-file, and process, if any), as well as the symbol file name."; |
| 3727 | |
| 3728 | static void |
| 3729 | default_rcmd (struct target_ops *self, const char *command, |
| 3730 | struct ui_file *output) |
| 3731 | { |
| 3732 | error (_("\"monitor\" command not supported by this target.")); |
| 3733 | } |
| 3734 | |
| 3735 | static void |
| 3736 | do_monitor_command (const char *cmd, int from_tty) |
| 3737 | { |
| 3738 | target_rcmd (cmd, gdb_stdtarg); |
| 3739 | } |
| 3740 | |
| 3741 | /* Erases all the memory regions marked as flash. CMD and FROM_TTY are |
| 3742 | ignored. */ |
| 3743 | |
| 3744 | void |
| 3745 | flash_erase_command (const char *cmd, int from_tty) |
| 3746 | { |
| 3747 | /* Used to communicate termination of flash operations to the target. */ |
| 3748 | bool found_flash_region = false; |
| 3749 | struct gdbarch *gdbarch = target_gdbarch (); |
| 3750 | |
| 3751 | std::vector<mem_region> mem_regions = target_memory_map (); |
| 3752 | |
| 3753 | /* Iterate over all memory regions. */ |
| 3754 | for (const mem_region &m : mem_regions) |
| 3755 | { |
| 3756 | /* Is this a flash memory region? */ |
| 3757 | if (m.attrib.mode == MEM_FLASH) |
| 3758 | { |
| 3759 | found_flash_region = true; |
| 3760 | target_flash_erase (m.lo, m.hi - m.lo); |
| 3761 | |
| 3762 | ui_out_emit_tuple tuple_emitter (current_uiout, "erased-regions"); |
| 3763 | |
| 3764 | current_uiout->message (_("Erasing flash memory region at address ")); |
| 3765 | current_uiout->field_fmt ("address", "%s", paddress (gdbarch, m.lo)); |
| 3766 | current_uiout->message (", size = "); |
| 3767 | current_uiout->field_fmt ("size", "%s", hex_string (m.hi - m.lo)); |
| 3768 | current_uiout->message ("\n"); |
| 3769 | } |
| 3770 | } |
| 3771 | |
| 3772 | /* Did we do any flash operations? If so, we need to finalize them. */ |
| 3773 | if (found_flash_region) |
| 3774 | target_flash_done (); |
| 3775 | else |
| 3776 | current_uiout->message (_("No flash memory regions found.\n")); |
| 3777 | } |
| 3778 | |
| 3779 | /* Print the name of each layers of our target stack. */ |
| 3780 | |
| 3781 | static void |
| 3782 | maintenance_print_target_stack (const char *cmd, int from_tty) |
| 3783 | { |
| 3784 | printf_filtered (_("The current target stack is:\n")); |
| 3785 | |
| 3786 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 3787 | { |
| 3788 | if (t->stratum () == debug_stratum) |
| 3789 | continue; |
| 3790 | printf_filtered (" - %s (%s)\n", t->shortname (), t->longname ()); |
| 3791 | } |
| 3792 | } |
| 3793 | |
| 3794 | /* See target.h. */ |
| 3795 | |
| 3796 | void |
| 3797 | target_async (int enable) |
| 3798 | { |
| 3799 | infrun_async (enable); |
| 3800 | current_top_target ()->async (enable); |
| 3801 | } |
| 3802 | |
| 3803 | /* See target.h. */ |
| 3804 | |
| 3805 | void |
| 3806 | target_thread_events (int enable) |
| 3807 | { |
| 3808 | current_top_target ()->thread_events (enable); |
| 3809 | } |
| 3810 | |
| 3811 | /* Controls if targets can report that they can/are async. This is |
| 3812 | just for maintainers to use when debugging gdb. */ |
| 3813 | int target_async_permitted = 1; |
| 3814 | |
| 3815 | /* The set command writes to this variable. If the inferior is |
| 3816 | executing, target_async_permitted is *not* updated. */ |
| 3817 | static int target_async_permitted_1 = 1; |
| 3818 | |
| 3819 | static void |
| 3820 | maint_set_target_async_command (const char *args, int from_tty, |
| 3821 | struct cmd_list_element *c) |
| 3822 | { |
| 3823 | if (have_live_inferiors ()) |
| 3824 | { |
| 3825 | target_async_permitted_1 = target_async_permitted; |
| 3826 | error (_("Cannot change this setting while the inferior is running.")); |
| 3827 | } |
| 3828 | |
| 3829 | target_async_permitted = target_async_permitted_1; |
| 3830 | } |
| 3831 | |
| 3832 | static void |
| 3833 | maint_show_target_async_command (struct ui_file *file, int from_tty, |
| 3834 | struct cmd_list_element *c, |
| 3835 | const char *value) |
| 3836 | { |
| 3837 | fprintf_filtered (file, |
| 3838 | _("Controlling the inferior in " |
| 3839 | "asynchronous mode is %s.\n"), value); |
| 3840 | } |
| 3841 | |
| 3842 | /* Return true if the target operates in non-stop mode even with "set |
| 3843 | non-stop off". */ |
| 3844 | |
| 3845 | static int |
| 3846 | target_always_non_stop_p (void) |
| 3847 | { |
| 3848 | return current_top_target ()->always_non_stop_p (); |
| 3849 | } |
| 3850 | |
| 3851 | /* See target.h. */ |
| 3852 | |
| 3853 | int |
| 3854 | target_is_non_stop_p (void) |
| 3855 | { |
| 3856 | return (non_stop |
| 3857 | || target_non_stop_enabled == AUTO_BOOLEAN_TRUE |
| 3858 | || (target_non_stop_enabled == AUTO_BOOLEAN_AUTO |
| 3859 | && target_always_non_stop_p ())); |
| 3860 | } |
| 3861 | |
| 3862 | /* Controls if targets can report that they always run in non-stop |
| 3863 | mode. This is just for maintainers to use when debugging gdb. */ |
| 3864 | enum auto_boolean target_non_stop_enabled = AUTO_BOOLEAN_AUTO; |
| 3865 | |
| 3866 | /* The set command writes to this variable. If the inferior is |
| 3867 | executing, target_non_stop_enabled is *not* updated. */ |
| 3868 | static enum auto_boolean target_non_stop_enabled_1 = AUTO_BOOLEAN_AUTO; |
| 3869 | |
| 3870 | /* Implementation of "maint set target-non-stop". */ |
| 3871 | |
| 3872 | static void |
| 3873 | maint_set_target_non_stop_command (const char *args, int from_tty, |
| 3874 | struct cmd_list_element *c) |
| 3875 | { |
| 3876 | if (have_live_inferiors ()) |
| 3877 | { |
| 3878 | target_non_stop_enabled_1 = target_non_stop_enabled; |
| 3879 | error (_("Cannot change this setting while the inferior is running.")); |
| 3880 | } |
| 3881 | |
| 3882 | target_non_stop_enabled = target_non_stop_enabled_1; |
| 3883 | } |
| 3884 | |
| 3885 | /* Implementation of "maint show target-non-stop". */ |
| 3886 | |
| 3887 | static void |
| 3888 | maint_show_target_non_stop_command (struct ui_file *file, int from_tty, |
| 3889 | struct cmd_list_element *c, |
| 3890 | const char *value) |
| 3891 | { |
| 3892 | if (target_non_stop_enabled == AUTO_BOOLEAN_AUTO) |
| 3893 | fprintf_filtered (file, |
| 3894 | _("Whether the target is always in non-stop mode " |
| 3895 | "is %s (currently %s).\n"), value, |
| 3896 | target_always_non_stop_p () ? "on" : "off"); |
| 3897 | else |
| 3898 | fprintf_filtered (file, |
| 3899 | _("Whether the target is always in non-stop mode " |
| 3900 | "is %s.\n"), value); |
| 3901 | } |
| 3902 | |
| 3903 | /* Temporary copies of permission settings. */ |
| 3904 | |
| 3905 | static int may_write_registers_1 = 1; |
| 3906 | static int may_write_memory_1 = 1; |
| 3907 | static int may_insert_breakpoints_1 = 1; |
| 3908 | static int may_insert_tracepoints_1 = 1; |
| 3909 | static int may_insert_fast_tracepoints_1 = 1; |
| 3910 | static int may_stop_1 = 1; |
| 3911 | |
| 3912 | /* Make the user-set values match the real values again. */ |
| 3913 | |
| 3914 | void |
| 3915 | update_target_permissions (void) |
| 3916 | { |
| 3917 | may_write_registers_1 = may_write_registers; |
| 3918 | may_write_memory_1 = may_write_memory; |
| 3919 | may_insert_breakpoints_1 = may_insert_breakpoints; |
| 3920 | may_insert_tracepoints_1 = may_insert_tracepoints; |
| 3921 | may_insert_fast_tracepoints_1 = may_insert_fast_tracepoints; |
| 3922 | may_stop_1 = may_stop; |
| 3923 | } |
| 3924 | |
| 3925 | /* The one function handles (most of) the permission flags in the same |
| 3926 | way. */ |
| 3927 | |
| 3928 | static void |
| 3929 | set_target_permissions (const char *args, int from_tty, |
| 3930 | struct cmd_list_element *c) |
| 3931 | { |
| 3932 | if (target_has_execution) |
| 3933 | { |
| 3934 | update_target_permissions (); |
| 3935 | error (_("Cannot change this setting while the inferior is running.")); |
| 3936 | } |
| 3937 | |
| 3938 | /* Make the real values match the user-changed values. */ |
| 3939 | may_write_registers = may_write_registers_1; |
| 3940 | may_insert_breakpoints = may_insert_breakpoints_1; |
| 3941 | may_insert_tracepoints = may_insert_tracepoints_1; |
| 3942 | may_insert_fast_tracepoints = may_insert_fast_tracepoints_1; |
| 3943 | may_stop = may_stop_1; |
| 3944 | update_observer_mode (); |
| 3945 | } |
| 3946 | |
| 3947 | /* Set memory write permission independently of observer mode. */ |
| 3948 | |
| 3949 | static void |
| 3950 | set_write_memory_permission (const char *args, int from_tty, |
| 3951 | struct cmd_list_element *c) |
| 3952 | { |
| 3953 | /* Make the real values match the user-changed values. */ |
| 3954 | may_write_memory = may_write_memory_1; |
| 3955 | update_observer_mode (); |
| 3956 | } |
| 3957 | |
| 3958 | void |
| 3959 | initialize_targets (void) |
| 3960 | { |
| 3961 | the_dummy_target = new dummy_target (); |
| 3962 | push_target (the_dummy_target); |
| 3963 | |
| 3964 | the_debug_target = new debug_target (); |
| 3965 | |
| 3966 | add_info ("target", info_target_command, targ_desc); |
| 3967 | add_info ("files", info_target_command, targ_desc); |
| 3968 | |
| 3969 | add_setshow_zuinteger_cmd ("target", class_maintenance, &targetdebug, _("\ |
| 3970 | Set target debugging."), _("\ |
| 3971 | Show target debugging."), _("\ |
| 3972 | When non-zero, target debugging is enabled. Higher numbers are more\n\ |
| 3973 | verbose."), |
| 3974 | set_targetdebug, |
| 3975 | show_targetdebug, |
| 3976 | &setdebuglist, &showdebuglist); |
| 3977 | |
| 3978 | add_setshow_boolean_cmd ("trust-readonly-sections", class_support, |
| 3979 | &trust_readonly, _("\ |
| 3980 | Set mode for reading from readonly sections."), _("\ |
| 3981 | Show mode for reading from readonly sections."), _("\ |
| 3982 | When this mode is on, memory reads from readonly sections (such as .text)\n\ |
| 3983 | will be read from the object file instead of from the target. This will\n\ |
| 3984 | result in significant performance improvement for remote targets."), |
| 3985 | NULL, |
| 3986 | show_trust_readonly, |
| 3987 | &setlist, &showlist); |
| 3988 | |
| 3989 | add_com ("monitor", class_obscure, do_monitor_command, |
| 3990 | _("Send a command to the remote monitor (remote targets only).")); |
| 3991 | |
| 3992 | add_cmd ("target-stack", class_maintenance, maintenance_print_target_stack, |
| 3993 | _("Print the name of each layer of the internal target stack."), |
| 3994 | &maintenanceprintlist); |
| 3995 | |
| 3996 | add_setshow_boolean_cmd ("target-async", no_class, |
| 3997 | &target_async_permitted_1, _("\ |
| 3998 | Set whether gdb controls the inferior in asynchronous mode."), _("\ |
| 3999 | Show whether gdb controls the inferior in asynchronous mode."), _("\ |
| 4000 | Tells gdb whether to control the inferior in asynchronous mode."), |
| 4001 | maint_set_target_async_command, |
| 4002 | maint_show_target_async_command, |
| 4003 | &maintenance_set_cmdlist, |
| 4004 | &maintenance_show_cmdlist); |
| 4005 | |
| 4006 | add_setshow_auto_boolean_cmd ("target-non-stop", no_class, |
| 4007 | &target_non_stop_enabled_1, _("\ |
| 4008 | Set whether gdb always controls the inferior in non-stop mode."), _("\ |
| 4009 | Show whether gdb always controls the inferior in non-stop mode."), _("\ |
| 4010 | Tells gdb whether to control the inferior in non-stop mode."), |
| 4011 | maint_set_target_non_stop_command, |
| 4012 | maint_show_target_non_stop_command, |
| 4013 | &maintenance_set_cmdlist, |
| 4014 | &maintenance_show_cmdlist); |
| 4015 | |
| 4016 | add_setshow_boolean_cmd ("may-write-registers", class_support, |
| 4017 | &may_write_registers_1, _("\ |
| 4018 | Set permission to write into registers."), _("\ |
| 4019 | Show permission to write into registers."), _("\ |
| 4020 | When this permission is on, GDB may write into the target's registers.\n\ |
| 4021 | Otherwise, any sort of write attempt will result in an error."), |
| 4022 | set_target_permissions, NULL, |
| 4023 | &setlist, &showlist); |
| 4024 | |
| 4025 | add_setshow_boolean_cmd ("may-write-memory", class_support, |
| 4026 | &may_write_memory_1, _("\ |
| 4027 | Set permission to write into target memory."), _("\ |
| 4028 | Show permission to write into target memory."), _("\ |
| 4029 | When this permission is on, GDB may write into the target's memory.\n\ |
| 4030 | Otherwise, any sort of write attempt will result in an error."), |
| 4031 | set_write_memory_permission, NULL, |
| 4032 | &setlist, &showlist); |
| 4033 | |
| 4034 | add_setshow_boolean_cmd ("may-insert-breakpoints", class_support, |
| 4035 | &may_insert_breakpoints_1, _("\ |
| 4036 | Set permission to insert breakpoints in the target."), _("\ |
| 4037 | Show permission to insert breakpoints in the target."), _("\ |
| 4038 | When this permission is on, GDB may insert breakpoints in the program.\n\ |
| 4039 | Otherwise, any sort of insertion attempt will result in an error."), |
| 4040 | set_target_permissions, NULL, |
| 4041 | &setlist, &showlist); |
| 4042 | |
| 4043 | add_setshow_boolean_cmd ("may-insert-tracepoints", class_support, |
| 4044 | &may_insert_tracepoints_1, _("\ |
| 4045 | Set permission to insert tracepoints in the target."), _("\ |
| 4046 | Show permission to insert tracepoints in the target."), _("\ |
| 4047 | When this permission is on, GDB may insert tracepoints in the program.\n\ |
| 4048 | Otherwise, any sort of insertion attempt will result in an error."), |
| 4049 | set_target_permissions, NULL, |
| 4050 | &setlist, &showlist); |
| 4051 | |
| 4052 | add_setshow_boolean_cmd ("may-insert-fast-tracepoints", class_support, |
| 4053 | &may_insert_fast_tracepoints_1, _("\ |
| 4054 | Set permission to insert fast tracepoints in the target."), _("\ |
| 4055 | Show permission to insert fast tracepoints in the target."), _("\ |
| 4056 | When this permission is on, GDB may insert fast tracepoints.\n\ |
| 4057 | Otherwise, any sort of insertion attempt will result in an error."), |
| 4058 | set_target_permissions, NULL, |
| 4059 | &setlist, &showlist); |
| 4060 | |
| 4061 | add_setshow_boolean_cmd ("may-interrupt", class_support, |
| 4062 | &may_stop_1, _("\ |
| 4063 | Set permission to interrupt or signal the target."), _("\ |
| 4064 | Show permission to interrupt or signal the target."), _("\ |
| 4065 | When this permission is on, GDB may interrupt/stop the target's execution.\n\ |
| 4066 | Otherwise, any attempt to interrupt or stop will be ignored."), |
| 4067 | set_target_permissions, NULL, |
| 4068 | &setlist, &showlist); |
| 4069 | |
| 4070 | add_com ("flash-erase", no_class, flash_erase_command, |
| 4071 | _("Erase all flash memory regions.")); |
| 4072 | |
| 4073 | add_setshow_boolean_cmd ("auto-connect-native-target", class_support, |
| 4074 | &auto_connect_native_target, _("\ |
| 4075 | Set whether GDB may automatically connect to the native target."), _("\ |
| 4076 | Show whether GDB may automatically connect to the native target."), _("\ |
| 4077 | When on, and GDB is not connected to a target yet, GDB\n\ |
| 4078 | attempts \"run\" and other commands with the native target."), |
| 4079 | NULL, show_auto_connect_native_target, |
| 4080 | &setlist, &showlist); |
| 4081 | } |