| 1 | /* Select target systems and architectures at runtime for GDB. |
| 2 | |
| 3 | Copyright (C) 1990-2019 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 "gdbsupport/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 "gdbsupport/byte-vector.h" |
| 50 | #include "terminal.h" |
| 51 | #include <unordered_map> |
| 52 | |
| 53 | static void generic_tls_error (void) ATTRIBUTE_NORETURN; |
| 54 | |
| 55 | static void default_terminal_info (struct target_ops *, const char *, int); |
| 56 | |
| 57 | static int default_watchpoint_addr_within_range (struct target_ops *, |
| 58 | CORE_ADDR, CORE_ADDR, int); |
| 59 | |
| 60 | static int default_region_ok_for_hw_watchpoint (struct target_ops *, |
| 61 | CORE_ADDR, int); |
| 62 | |
| 63 | static void default_rcmd (struct target_ops *, const char *, struct ui_file *); |
| 64 | |
| 65 | static ptid_t default_get_ada_task_ptid (struct target_ops *self, |
| 66 | long lwp, long tid); |
| 67 | |
| 68 | static int default_follow_fork (struct target_ops *self, int follow_child, |
| 69 | int detach_fork); |
| 70 | |
| 71 | static void default_mourn_inferior (struct target_ops *self); |
| 72 | |
| 73 | static int default_search_memory (struct target_ops *ops, |
| 74 | CORE_ADDR start_addr, |
| 75 | ULONGEST search_space_len, |
| 76 | const gdb_byte *pattern, |
| 77 | ULONGEST pattern_len, |
| 78 | CORE_ADDR *found_addrp); |
| 79 | |
| 80 | static int default_verify_memory (struct target_ops *self, |
| 81 | const gdb_byte *data, |
| 82 | CORE_ADDR memaddr, ULONGEST size); |
| 83 | |
| 84 | static void tcomplain (void) ATTRIBUTE_NORETURN; |
| 85 | |
| 86 | static struct target_ops *find_default_run_target (const char *); |
| 87 | |
| 88 | static int dummy_find_memory_regions (struct target_ops *self, |
| 89 | find_memory_region_ftype ignore1, |
| 90 | void *ignore2); |
| 91 | |
| 92 | static char *dummy_make_corefile_notes (struct target_ops *self, |
| 93 | bfd *ignore1, int *ignore2); |
| 94 | |
| 95 | static std::string default_pid_to_str (struct target_ops *ops, ptid_t ptid); |
| 96 | |
| 97 | static enum exec_direction_kind default_execution_direction |
| 98 | (struct target_ops *self); |
| 99 | |
| 100 | /* Mapping between target_info objects (which have address identity) |
| 101 | and corresponding open/factory function/callback. Each add_target |
| 102 | call adds one entry to this map, and registers a "target |
| 103 | TARGET_NAME" command that when invoked calls the factory registered |
| 104 | here. The target_info object is associated with the command via |
| 105 | the command's context. */ |
| 106 | static std::unordered_map<const target_info *, target_open_ftype *> |
| 107 | target_factories; |
| 108 | |
| 109 | /* The singleton debug target. */ |
| 110 | |
| 111 | static struct target_ops *the_debug_target; |
| 112 | |
| 113 | /* The target stack. */ |
| 114 | |
| 115 | static target_stack g_target_stack; |
| 116 | |
| 117 | /* Top of target stack. */ |
| 118 | /* The target structure we are currently using to talk to a process |
| 119 | or file or whatever "inferior" we have. */ |
| 120 | |
| 121 | target_ops * |
| 122 | current_top_target () |
| 123 | { |
| 124 | return g_target_stack.top (); |
| 125 | } |
| 126 | |
| 127 | /* Command list for target. */ |
| 128 | |
| 129 | static struct cmd_list_element *targetlist = NULL; |
| 130 | |
| 131 | /* True if we should trust readonly sections from the |
| 132 | executable when reading memory. */ |
| 133 | |
| 134 | static bool trust_readonly = false; |
| 135 | |
| 136 | /* Nonzero if we should show true memory content including |
| 137 | memory breakpoint inserted by gdb. */ |
| 138 | |
| 139 | static int show_memory_breakpoints = 0; |
| 140 | |
| 141 | /* These globals control whether GDB attempts to perform these |
| 142 | operations; they are useful for targets that need to prevent |
| 143 | inadvertent disruption, such as in non-stop mode. */ |
| 144 | |
| 145 | bool may_write_registers = true; |
| 146 | |
| 147 | bool may_write_memory = true; |
| 148 | |
| 149 | bool may_insert_breakpoints = true; |
| 150 | |
| 151 | bool may_insert_tracepoints = true; |
| 152 | |
| 153 | bool may_insert_fast_tracepoints = true; |
| 154 | |
| 155 | bool may_stop = true; |
| 156 | |
| 157 | /* Non-zero if we want to see trace of target level stuff. */ |
| 158 | |
| 159 | static unsigned int targetdebug = 0; |
| 160 | |
| 161 | static void |
| 162 | set_targetdebug (const char *args, int from_tty, struct cmd_list_element *c) |
| 163 | { |
| 164 | if (targetdebug) |
| 165 | push_target (the_debug_target); |
| 166 | else |
| 167 | unpush_target (the_debug_target); |
| 168 | } |
| 169 | |
| 170 | static void |
| 171 | show_targetdebug (struct ui_file *file, int from_tty, |
| 172 | struct cmd_list_element *c, const char *value) |
| 173 | { |
| 174 | fprintf_filtered (file, _("Target debugging is %s.\n"), value); |
| 175 | } |
| 176 | |
| 177 | /* The user just typed 'target' without the name of a target. */ |
| 178 | |
| 179 | static void |
| 180 | target_command (const char *arg, int from_tty) |
| 181 | { |
| 182 | fputs_filtered ("Argument required (target name). Try `help target'\n", |
| 183 | gdb_stdout); |
| 184 | } |
| 185 | |
| 186 | int |
| 187 | target_has_all_memory_1 (void) |
| 188 | { |
| 189 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 190 | if (t->has_all_memory ()) |
| 191 | return 1; |
| 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | int |
| 197 | target_has_memory_1 (void) |
| 198 | { |
| 199 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 200 | if (t->has_memory ()) |
| 201 | return 1; |
| 202 | |
| 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | int |
| 207 | target_has_stack_1 (void) |
| 208 | { |
| 209 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 210 | if (t->has_stack ()) |
| 211 | return 1; |
| 212 | |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | int |
| 217 | target_has_registers_1 (void) |
| 218 | { |
| 219 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 220 | if (t->has_registers ()) |
| 221 | return 1; |
| 222 | |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | int |
| 227 | target_has_execution_1 (ptid_t the_ptid) |
| 228 | { |
| 229 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 230 | if (t->has_execution (the_ptid)) |
| 231 | return 1; |
| 232 | |
| 233 | return 0; |
| 234 | } |
| 235 | |
| 236 | int |
| 237 | target_has_execution_current (void) |
| 238 | { |
| 239 | return target_has_execution_1 (inferior_ptid); |
| 240 | } |
| 241 | |
| 242 | /* This is used to implement the various target commands. */ |
| 243 | |
| 244 | static void |
| 245 | open_target (const char *args, int from_tty, struct cmd_list_element *command) |
| 246 | { |
| 247 | auto *ti = static_cast<target_info *> (get_cmd_context (command)); |
| 248 | target_open_ftype *func = target_factories[ti]; |
| 249 | |
| 250 | if (targetdebug) |
| 251 | fprintf_unfiltered (gdb_stdlog, "-> %s->open (...)\n", |
| 252 | ti->shortname); |
| 253 | |
| 254 | func (args, from_tty); |
| 255 | |
| 256 | if (targetdebug) |
| 257 | fprintf_unfiltered (gdb_stdlog, "<- %s->open (%s, %d)\n", |
| 258 | ti->shortname, args, from_tty); |
| 259 | } |
| 260 | |
| 261 | /* See target.h. */ |
| 262 | |
| 263 | void |
| 264 | add_target (const target_info &t, target_open_ftype *func, |
| 265 | completer_ftype *completer) |
| 266 | { |
| 267 | struct cmd_list_element *c; |
| 268 | |
| 269 | auto &func_slot = target_factories[&t]; |
| 270 | if (func_slot != nullptr) |
| 271 | internal_error (__FILE__, __LINE__, |
| 272 | _("target already added (\"%s\")."), t.shortname); |
| 273 | func_slot = func; |
| 274 | |
| 275 | if (targetlist == NULL) |
| 276 | add_prefix_cmd ("target", class_run, target_command, _("\ |
| 277 | Connect to a target machine or process.\n\ |
| 278 | The first argument is the type or protocol of the target machine.\n\ |
| 279 | Remaining arguments are interpreted by the target protocol. For more\n\ |
| 280 | information on the arguments for a particular protocol, type\n\ |
| 281 | `help target ' followed by the protocol name."), |
| 282 | &targetlist, "target ", 0, &cmdlist); |
| 283 | c = add_cmd (t.shortname, no_class, t.doc, &targetlist); |
| 284 | set_cmd_context (c, (void *) &t); |
| 285 | set_cmd_sfunc (c, open_target); |
| 286 | if (completer != NULL) |
| 287 | set_cmd_completer (c, completer); |
| 288 | } |
| 289 | |
| 290 | /* See target.h. */ |
| 291 | |
| 292 | void |
| 293 | add_deprecated_target_alias (const target_info &tinfo, const char *alias) |
| 294 | { |
| 295 | struct cmd_list_element *c; |
| 296 | char *alt; |
| 297 | |
| 298 | /* If we use add_alias_cmd, here, we do not get the deprecated warning, |
| 299 | see PR cli/15104. */ |
| 300 | c = add_cmd (alias, no_class, tinfo.doc, &targetlist); |
| 301 | set_cmd_sfunc (c, open_target); |
| 302 | set_cmd_context (c, (void *) &tinfo); |
| 303 | alt = xstrprintf ("target %s", tinfo.shortname); |
| 304 | deprecate_cmd (c, alt); |
| 305 | } |
| 306 | |
| 307 | /* Stub functions */ |
| 308 | |
| 309 | void |
| 310 | target_kill (void) |
| 311 | { |
| 312 | current_top_target ()->kill (); |
| 313 | } |
| 314 | |
| 315 | void |
| 316 | target_load (const char *arg, int from_tty) |
| 317 | { |
| 318 | target_dcache_invalidate (); |
| 319 | current_top_target ()->load (arg, from_tty); |
| 320 | } |
| 321 | |
| 322 | /* Define it. */ |
| 323 | |
| 324 | target_terminal_state target_terminal::m_terminal_state |
| 325 | = target_terminal_state::is_ours; |
| 326 | |
| 327 | /* See target/target.h. */ |
| 328 | |
| 329 | void |
| 330 | target_terminal::init (void) |
| 331 | { |
| 332 | current_top_target ()->terminal_init (); |
| 333 | |
| 334 | m_terminal_state = target_terminal_state::is_ours; |
| 335 | } |
| 336 | |
| 337 | /* See target/target.h. */ |
| 338 | |
| 339 | void |
| 340 | target_terminal::inferior (void) |
| 341 | { |
| 342 | struct ui *ui = current_ui; |
| 343 | |
| 344 | /* A background resume (``run&'') should leave GDB in control of the |
| 345 | terminal. */ |
| 346 | if (ui->prompt_state != PROMPT_BLOCKED) |
| 347 | return; |
| 348 | |
| 349 | /* Since we always run the inferior in the main console (unless "set |
| 350 | inferior-tty" is in effect), when some UI other than the main one |
| 351 | calls target_terminal::inferior, then we leave the main UI's |
| 352 | terminal settings as is. */ |
| 353 | if (ui != main_ui) |
| 354 | return; |
| 355 | |
| 356 | /* If GDB is resuming the inferior in the foreground, install |
| 357 | inferior's terminal modes. */ |
| 358 | |
| 359 | struct inferior *inf = current_inferior (); |
| 360 | |
| 361 | if (inf->terminal_state != target_terminal_state::is_inferior) |
| 362 | { |
| 363 | current_top_target ()->terminal_inferior (); |
| 364 | inf->terminal_state = target_terminal_state::is_inferior; |
| 365 | } |
| 366 | |
| 367 | m_terminal_state = target_terminal_state::is_inferior; |
| 368 | |
| 369 | /* If the user hit C-c before, pretend that it was hit right |
| 370 | here. */ |
| 371 | if (check_quit_flag ()) |
| 372 | target_pass_ctrlc (); |
| 373 | } |
| 374 | |
| 375 | /* See target/target.h. */ |
| 376 | |
| 377 | void |
| 378 | target_terminal::restore_inferior (void) |
| 379 | { |
| 380 | struct ui *ui = current_ui; |
| 381 | |
| 382 | /* See target_terminal::inferior(). */ |
| 383 | if (ui->prompt_state != PROMPT_BLOCKED || ui != main_ui) |
| 384 | return; |
| 385 | |
| 386 | /* Restore the terminal settings of inferiors that were in the |
| 387 | foreground but are now ours_for_output due to a temporary |
| 388 | target_target::ours_for_output() call. */ |
| 389 | |
| 390 | { |
| 391 | scoped_restore_current_inferior restore_inferior; |
| 392 | |
| 393 | for (::inferior *inf : all_inferiors ()) |
| 394 | { |
| 395 | if (inf->terminal_state == target_terminal_state::is_ours_for_output) |
| 396 | { |
| 397 | set_current_inferior (inf); |
| 398 | current_top_target ()->terminal_inferior (); |
| 399 | inf->terminal_state = target_terminal_state::is_inferior; |
| 400 | } |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | m_terminal_state = target_terminal_state::is_inferior; |
| 405 | |
| 406 | /* If the user hit C-c before, pretend that it was hit right |
| 407 | here. */ |
| 408 | if (check_quit_flag ()) |
| 409 | target_pass_ctrlc (); |
| 410 | } |
| 411 | |
| 412 | /* Switch terminal state to DESIRED_STATE, either is_ours, or |
| 413 | is_ours_for_output. */ |
| 414 | |
| 415 | static void |
| 416 | target_terminal_is_ours_kind (target_terminal_state desired_state) |
| 417 | { |
| 418 | scoped_restore_current_inferior restore_inferior; |
| 419 | |
| 420 | /* Must do this in two passes. First, have all inferiors save the |
| 421 | current terminal settings. Then, after all inferiors have add a |
| 422 | chance to safely save the terminal settings, restore GDB's |
| 423 | terminal settings. */ |
| 424 | |
| 425 | for (inferior *inf : all_inferiors ()) |
| 426 | { |
| 427 | if (inf->terminal_state == target_terminal_state::is_inferior) |
| 428 | { |
| 429 | set_current_inferior (inf); |
| 430 | current_top_target ()->terminal_save_inferior (); |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | for (inferior *inf : all_inferiors ()) |
| 435 | { |
| 436 | /* Note we don't check is_inferior here like above because we |
| 437 | need to handle 'is_ours_for_output -> is_ours' too. Careful |
| 438 | to never transition from 'is_ours' to 'is_ours_for_output', |
| 439 | though. */ |
| 440 | if (inf->terminal_state != target_terminal_state::is_ours |
| 441 | && inf->terminal_state != desired_state) |
| 442 | { |
| 443 | set_current_inferior (inf); |
| 444 | if (desired_state == target_terminal_state::is_ours) |
| 445 | current_top_target ()->terminal_ours (); |
| 446 | else if (desired_state == target_terminal_state::is_ours_for_output) |
| 447 | current_top_target ()->terminal_ours_for_output (); |
| 448 | else |
| 449 | gdb_assert_not_reached ("unhandled desired state"); |
| 450 | inf->terminal_state = desired_state; |
| 451 | } |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | /* See target/target.h. */ |
| 456 | |
| 457 | void |
| 458 | target_terminal::ours () |
| 459 | { |
| 460 | struct ui *ui = current_ui; |
| 461 | |
| 462 | /* See target_terminal::inferior. */ |
| 463 | if (ui != main_ui) |
| 464 | return; |
| 465 | |
| 466 | if (m_terminal_state == target_terminal_state::is_ours) |
| 467 | return; |
| 468 | |
| 469 | target_terminal_is_ours_kind (target_terminal_state::is_ours); |
| 470 | m_terminal_state = target_terminal_state::is_ours; |
| 471 | } |
| 472 | |
| 473 | /* See target/target.h. */ |
| 474 | |
| 475 | void |
| 476 | target_terminal::ours_for_output () |
| 477 | { |
| 478 | struct ui *ui = current_ui; |
| 479 | |
| 480 | /* See target_terminal::inferior. */ |
| 481 | if (ui != main_ui) |
| 482 | return; |
| 483 | |
| 484 | if (!target_terminal::is_inferior ()) |
| 485 | return; |
| 486 | |
| 487 | target_terminal_is_ours_kind (target_terminal_state::is_ours_for_output); |
| 488 | target_terminal::m_terminal_state = target_terminal_state::is_ours_for_output; |
| 489 | } |
| 490 | |
| 491 | /* See target/target.h. */ |
| 492 | |
| 493 | void |
| 494 | target_terminal::info (const char *arg, int from_tty) |
| 495 | { |
| 496 | current_top_target ()->terminal_info (arg, from_tty); |
| 497 | } |
| 498 | |
| 499 | /* See target.h. */ |
| 500 | |
| 501 | bool |
| 502 | target_supports_terminal_ours (void) |
| 503 | { |
| 504 | /* This can be called before there is any target, so we must check |
| 505 | for nullptr here. */ |
| 506 | target_ops *top = current_top_target (); |
| 507 | |
| 508 | if (top == nullptr) |
| 509 | return false; |
| 510 | return top->supports_terminal_ours (); |
| 511 | } |
| 512 | |
| 513 | static void |
| 514 | tcomplain (void) |
| 515 | { |
| 516 | error (_("You can't do that when your target is `%s'"), |
| 517 | current_top_target ()->shortname ()); |
| 518 | } |
| 519 | |
| 520 | void |
| 521 | noprocess (void) |
| 522 | { |
| 523 | error (_("You can't do that without a process to debug.")); |
| 524 | } |
| 525 | |
| 526 | static void |
| 527 | default_terminal_info (struct target_ops *self, const char *args, int from_tty) |
| 528 | { |
| 529 | printf_unfiltered (_("No saved terminal information.\n")); |
| 530 | } |
| 531 | |
| 532 | /* A default implementation for the to_get_ada_task_ptid target method. |
| 533 | |
| 534 | This function builds the PTID by using both LWP and TID as part of |
| 535 | the PTID lwp and tid elements. The pid used is the pid of the |
| 536 | inferior_ptid. */ |
| 537 | |
| 538 | static ptid_t |
| 539 | default_get_ada_task_ptid (struct target_ops *self, long lwp, long tid) |
| 540 | { |
| 541 | return ptid_t (inferior_ptid.pid (), lwp, tid); |
| 542 | } |
| 543 | |
| 544 | static enum exec_direction_kind |
| 545 | default_execution_direction (struct target_ops *self) |
| 546 | { |
| 547 | if (!target_can_execute_reverse) |
| 548 | return EXEC_FORWARD; |
| 549 | else if (!target_can_async_p ()) |
| 550 | return EXEC_FORWARD; |
| 551 | else |
| 552 | gdb_assert_not_reached ("\ |
| 553 | to_execution_direction must be implemented for reverse async"); |
| 554 | } |
| 555 | |
| 556 | /* See target.h. */ |
| 557 | |
| 558 | void |
| 559 | target_stack::push (target_ops *t) |
| 560 | { |
| 561 | /* If there's already a target at this stratum, remove it. */ |
| 562 | strata stratum = t->stratum (); |
| 563 | |
| 564 | if (m_stack[stratum] != NULL) |
| 565 | unpush (m_stack[stratum]); |
| 566 | |
| 567 | /* Now add the new one. */ |
| 568 | m_stack[stratum] = t; |
| 569 | |
| 570 | if (m_top < stratum) |
| 571 | m_top = stratum; |
| 572 | } |
| 573 | |
| 574 | /* See target.h. */ |
| 575 | |
| 576 | void |
| 577 | push_target (struct target_ops *t) |
| 578 | { |
| 579 | g_target_stack.push (t); |
| 580 | } |
| 581 | |
| 582 | /* See target.h */ |
| 583 | |
| 584 | void |
| 585 | push_target (target_ops_up &&t) |
| 586 | { |
| 587 | g_target_stack.push (t.get ()); |
| 588 | t.release (); |
| 589 | } |
| 590 | |
| 591 | /* See target.h. */ |
| 592 | |
| 593 | int |
| 594 | unpush_target (struct target_ops *t) |
| 595 | { |
| 596 | return g_target_stack.unpush (t); |
| 597 | } |
| 598 | |
| 599 | /* See target.h. */ |
| 600 | |
| 601 | bool |
| 602 | target_stack::unpush (target_ops *t) |
| 603 | { |
| 604 | gdb_assert (t != NULL); |
| 605 | |
| 606 | strata stratum = t->stratum (); |
| 607 | |
| 608 | if (stratum == dummy_stratum) |
| 609 | internal_error (__FILE__, __LINE__, |
| 610 | _("Attempt to unpush the dummy target")); |
| 611 | |
| 612 | /* Look for the specified target. Note that a target can only occur |
| 613 | once in the target stack. */ |
| 614 | |
| 615 | if (m_stack[stratum] != t) |
| 616 | { |
| 617 | /* If T wasn't pushed, quit. Only open targets should be |
| 618 | closed. */ |
| 619 | return false; |
| 620 | } |
| 621 | |
| 622 | /* Unchain the target. */ |
| 623 | m_stack[stratum] = NULL; |
| 624 | |
| 625 | if (m_top == stratum) |
| 626 | m_top = t->beneath ()->stratum (); |
| 627 | |
| 628 | /* Finally close the target. Note we do this after unchaining, so |
| 629 | any target method calls from within the target_close |
| 630 | implementation don't end up in T anymore. */ |
| 631 | target_close (t); |
| 632 | |
| 633 | return true; |
| 634 | } |
| 635 | |
| 636 | /* Unpush TARGET and assert that it worked. */ |
| 637 | |
| 638 | static void |
| 639 | unpush_target_and_assert (struct target_ops *target) |
| 640 | { |
| 641 | if (!unpush_target (target)) |
| 642 | { |
| 643 | fprintf_unfiltered (gdb_stderr, |
| 644 | "pop_all_targets couldn't find target %s\n", |
| 645 | target->shortname ()); |
| 646 | internal_error (__FILE__, __LINE__, |
| 647 | _("failed internal consistency check")); |
| 648 | } |
| 649 | } |
| 650 | |
| 651 | void |
| 652 | pop_all_targets_above (enum strata above_stratum) |
| 653 | { |
| 654 | while ((int) (current_top_target ()->stratum ()) > (int) above_stratum) |
| 655 | unpush_target_and_assert (current_top_target ()); |
| 656 | } |
| 657 | |
| 658 | /* See target.h. */ |
| 659 | |
| 660 | void |
| 661 | pop_all_targets_at_and_above (enum strata stratum) |
| 662 | { |
| 663 | while ((int) (current_top_target ()->stratum ()) >= (int) stratum) |
| 664 | unpush_target_and_assert (current_top_target ()); |
| 665 | } |
| 666 | |
| 667 | void |
| 668 | pop_all_targets (void) |
| 669 | { |
| 670 | pop_all_targets_above (dummy_stratum); |
| 671 | } |
| 672 | |
| 673 | /* Return 1 if T is now pushed in the target stack. Return 0 otherwise. */ |
| 674 | |
| 675 | int |
| 676 | target_is_pushed (struct target_ops *t) |
| 677 | { |
| 678 | return g_target_stack.is_pushed (t); |
| 679 | } |
| 680 | |
| 681 | /* Default implementation of to_get_thread_local_address. */ |
| 682 | |
| 683 | static void |
| 684 | generic_tls_error (void) |
| 685 | { |
| 686 | throw_error (TLS_GENERIC_ERROR, |
| 687 | _("Cannot find thread-local variables on this target")); |
| 688 | } |
| 689 | |
| 690 | /* Using the objfile specified in OBJFILE, find the address for the |
| 691 | current thread's thread-local storage with offset OFFSET. */ |
| 692 | CORE_ADDR |
| 693 | target_translate_tls_address (struct objfile *objfile, CORE_ADDR offset) |
| 694 | { |
| 695 | volatile CORE_ADDR addr = 0; |
| 696 | struct target_ops *target = current_top_target (); |
| 697 | struct gdbarch *gdbarch = target_gdbarch (); |
| 698 | |
| 699 | if (gdbarch_fetch_tls_load_module_address_p (gdbarch)) |
| 700 | { |
| 701 | ptid_t ptid = inferior_ptid; |
| 702 | |
| 703 | try |
| 704 | { |
| 705 | CORE_ADDR lm_addr; |
| 706 | |
| 707 | /* Fetch the load module address for this objfile. */ |
| 708 | lm_addr = gdbarch_fetch_tls_load_module_address (gdbarch, |
| 709 | objfile); |
| 710 | |
| 711 | if (gdbarch_get_thread_local_address_p (gdbarch)) |
| 712 | addr = gdbarch_get_thread_local_address (gdbarch, ptid, lm_addr, |
| 713 | offset); |
| 714 | else |
| 715 | addr = target->get_thread_local_address (ptid, lm_addr, offset); |
| 716 | } |
| 717 | /* If an error occurred, print TLS related messages here. Otherwise, |
| 718 | throw the error to some higher catcher. */ |
| 719 | catch (const gdb_exception &ex) |
| 720 | { |
| 721 | int objfile_is_library = (objfile->flags & OBJF_SHARED); |
| 722 | |
| 723 | switch (ex.error) |
| 724 | { |
| 725 | case TLS_NO_LIBRARY_SUPPORT_ERROR: |
| 726 | error (_("Cannot find thread-local variables " |
| 727 | "in this thread library.")); |
| 728 | break; |
| 729 | case TLS_LOAD_MODULE_NOT_FOUND_ERROR: |
| 730 | if (objfile_is_library) |
| 731 | error (_("Cannot find shared library `%s' in dynamic" |
| 732 | " linker's load module list"), objfile_name (objfile)); |
| 733 | else |
| 734 | error (_("Cannot find executable file `%s' in dynamic" |
| 735 | " linker's load module list"), objfile_name (objfile)); |
| 736 | break; |
| 737 | case TLS_NOT_ALLOCATED_YET_ERROR: |
| 738 | if (objfile_is_library) |
| 739 | error (_("The inferior has not yet allocated storage for" |
| 740 | " thread-local variables in\n" |
| 741 | "the shared library `%s'\n" |
| 742 | "for %s"), |
| 743 | objfile_name (objfile), |
| 744 | target_pid_to_str (ptid).c_str ()); |
| 745 | else |
| 746 | error (_("The inferior has not yet allocated storage for" |
| 747 | " thread-local variables in\n" |
| 748 | "the executable `%s'\n" |
| 749 | "for %s"), |
| 750 | objfile_name (objfile), |
| 751 | target_pid_to_str (ptid).c_str ()); |
| 752 | break; |
| 753 | case TLS_GENERIC_ERROR: |
| 754 | if (objfile_is_library) |
| 755 | error (_("Cannot find thread-local storage for %s, " |
| 756 | "shared library %s:\n%s"), |
| 757 | target_pid_to_str (ptid).c_str (), |
| 758 | objfile_name (objfile), ex.what ()); |
| 759 | else |
| 760 | error (_("Cannot find thread-local storage for %s, " |
| 761 | "executable file %s:\n%s"), |
| 762 | target_pid_to_str (ptid).c_str (), |
| 763 | objfile_name (objfile), ex.what ()); |
| 764 | break; |
| 765 | default: |
| 766 | throw; |
| 767 | break; |
| 768 | } |
| 769 | } |
| 770 | } |
| 771 | else |
| 772 | error (_("Cannot find thread-local variables on this target")); |
| 773 | |
| 774 | return addr; |
| 775 | } |
| 776 | |
| 777 | const char * |
| 778 | target_xfer_status_to_string (enum target_xfer_status status) |
| 779 | { |
| 780 | #define CASE(X) case X: return #X |
| 781 | switch (status) |
| 782 | { |
| 783 | CASE(TARGET_XFER_E_IO); |
| 784 | CASE(TARGET_XFER_UNAVAILABLE); |
| 785 | default: |
| 786 | return "<unknown>"; |
| 787 | } |
| 788 | #undef CASE |
| 789 | }; |
| 790 | |
| 791 | |
| 792 | #undef MIN |
| 793 | #define MIN(A, B) (((A) <= (B)) ? (A) : (B)) |
| 794 | |
| 795 | /* target_read_string -- read a null terminated string, up to LEN bytes, |
| 796 | from MEMADDR in target. Set *ERRNOP to the errno code, or 0 if successful. |
| 797 | Set *STRING to a pointer to malloc'd memory containing the data; the caller |
| 798 | is responsible for freeing it. Return the number of bytes successfully |
| 799 | read. */ |
| 800 | |
| 801 | int |
| 802 | target_read_string (CORE_ADDR memaddr, gdb::unique_xmalloc_ptr<char> *string, |
| 803 | int len, int *errnop) |
| 804 | { |
| 805 | int tlen, offset, i; |
| 806 | gdb_byte buf[4]; |
| 807 | int errcode = 0; |
| 808 | char *buffer; |
| 809 | int buffer_allocated; |
| 810 | char *bufptr; |
| 811 | unsigned int nbytes_read = 0; |
| 812 | |
| 813 | gdb_assert (string); |
| 814 | |
| 815 | /* Small for testing. */ |
| 816 | buffer_allocated = 4; |
| 817 | buffer = (char *) xmalloc (buffer_allocated); |
| 818 | bufptr = buffer; |
| 819 | |
| 820 | while (len > 0) |
| 821 | { |
| 822 | tlen = MIN (len, 4 - (memaddr & 3)); |
| 823 | offset = memaddr & 3; |
| 824 | |
| 825 | errcode = target_read_memory (memaddr & ~3, buf, sizeof buf); |
| 826 | if (errcode != 0) |
| 827 | { |
| 828 | /* The transfer request might have crossed the boundary to an |
| 829 | unallocated region of memory. Retry the transfer, requesting |
| 830 | a single byte. */ |
| 831 | tlen = 1; |
| 832 | offset = 0; |
| 833 | errcode = target_read_memory (memaddr, buf, 1); |
| 834 | if (errcode != 0) |
| 835 | goto done; |
| 836 | } |
| 837 | |
| 838 | if (bufptr - buffer + tlen > buffer_allocated) |
| 839 | { |
| 840 | unsigned int bytes; |
| 841 | |
| 842 | bytes = bufptr - buffer; |
| 843 | buffer_allocated *= 2; |
| 844 | buffer = (char *) xrealloc (buffer, buffer_allocated); |
| 845 | bufptr = buffer + bytes; |
| 846 | } |
| 847 | |
| 848 | for (i = 0; i < tlen; i++) |
| 849 | { |
| 850 | *bufptr++ = buf[i + offset]; |
| 851 | if (buf[i + offset] == '\000') |
| 852 | { |
| 853 | nbytes_read += i + 1; |
| 854 | goto done; |
| 855 | } |
| 856 | } |
| 857 | |
| 858 | memaddr += tlen; |
| 859 | len -= tlen; |
| 860 | nbytes_read += tlen; |
| 861 | } |
| 862 | done: |
| 863 | string->reset (buffer); |
| 864 | if (errnop != NULL) |
| 865 | *errnop = errcode; |
| 866 | return nbytes_read; |
| 867 | } |
| 868 | |
| 869 | struct target_section_table * |
| 870 | target_get_section_table (struct target_ops *target) |
| 871 | { |
| 872 | return target->get_section_table (); |
| 873 | } |
| 874 | |
| 875 | /* Find a section containing ADDR. */ |
| 876 | |
| 877 | struct target_section * |
| 878 | target_section_by_addr (struct target_ops *target, CORE_ADDR addr) |
| 879 | { |
| 880 | struct target_section_table *table = target_get_section_table (target); |
| 881 | struct target_section *secp; |
| 882 | |
| 883 | if (table == NULL) |
| 884 | return NULL; |
| 885 | |
| 886 | for (secp = table->sections; secp < table->sections_end; secp++) |
| 887 | { |
| 888 | if (addr >= secp->addr && addr < secp->endaddr) |
| 889 | return secp; |
| 890 | } |
| 891 | return NULL; |
| 892 | } |
| 893 | |
| 894 | |
| 895 | /* Helper for the memory xfer routines. Checks the attributes of the |
| 896 | memory region of MEMADDR against the read or write being attempted. |
| 897 | If the access is permitted returns true, otherwise returns false. |
| 898 | REGION_P is an optional output parameter. If not-NULL, it is |
| 899 | filled with a pointer to the memory region of MEMADDR. REG_LEN |
| 900 | returns LEN trimmed to the end of the region. This is how much the |
| 901 | caller can continue requesting, if the access is permitted. A |
| 902 | single xfer request must not straddle memory region boundaries. */ |
| 903 | |
| 904 | static int |
| 905 | memory_xfer_check_region (gdb_byte *readbuf, const gdb_byte *writebuf, |
| 906 | ULONGEST memaddr, ULONGEST len, ULONGEST *reg_len, |
| 907 | struct mem_region **region_p) |
| 908 | { |
| 909 | struct mem_region *region; |
| 910 | |
| 911 | region = lookup_mem_region (memaddr); |
| 912 | |
| 913 | if (region_p != NULL) |
| 914 | *region_p = region; |
| 915 | |
| 916 | switch (region->attrib.mode) |
| 917 | { |
| 918 | case MEM_RO: |
| 919 | if (writebuf != NULL) |
| 920 | return 0; |
| 921 | break; |
| 922 | |
| 923 | case MEM_WO: |
| 924 | if (readbuf != NULL) |
| 925 | return 0; |
| 926 | break; |
| 927 | |
| 928 | case MEM_FLASH: |
| 929 | /* We only support writing to flash during "load" for now. */ |
| 930 | if (writebuf != NULL) |
| 931 | error (_("Writing to flash memory forbidden in this context")); |
| 932 | break; |
| 933 | |
| 934 | case MEM_NONE: |
| 935 | return 0; |
| 936 | } |
| 937 | |
| 938 | /* region->hi == 0 means there's no upper bound. */ |
| 939 | if (memaddr + len < region->hi || region->hi == 0) |
| 940 | *reg_len = len; |
| 941 | else |
| 942 | *reg_len = region->hi - memaddr; |
| 943 | |
| 944 | return 1; |
| 945 | } |
| 946 | |
| 947 | /* Read memory from more than one valid target. A core file, for |
| 948 | instance, could have some of memory but delegate other bits to |
| 949 | the target below it. So, we must manually try all targets. */ |
| 950 | |
| 951 | enum target_xfer_status |
| 952 | raw_memory_xfer_partial (struct target_ops *ops, gdb_byte *readbuf, |
| 953 | const gdb_byte *writebuf, ULONGEST memaddr, LONGEST len, |
| 954 | ULONGEST *xfered_len) |
| 955 | { |
| 956 | enum target_xfer_status res; |
| 957 | |
| 958 | do |
| 959 | { |
| 960 | res = ops->xfer_partial (TARGET_OBJECT_MEMORY, NULL, |
| 961 | readbuf, writebuf, memaddr, len, |
| 962 | xfered_len); |
| 963 | if (res == TARGET_XFER_OK) |
| 964 | break; |
| 965 | |
| 966 | /* Stop if the target reports that the memory is not available. */ |
| 967 | if (res == TARGET_XFER_UNAVAILABLE) |
| 968 | break; |
| 969 | |
| 970 | /* We want to continue past core files to executables, but not |
| 971 | past a running target's memory. */ |
| 972 | if (ops->has_all_memory ()) |
| 973 | break; |
| 974 | |
| 975 | ops = ops->beneath (); |
| 976 | } |
| 977 | while (ops != NULL); |
| 978 | |
| 979 | /* The cache works at the raw memory level. Make sure the cache |
| 980 | gets updated with raw contents no matter what kind of memory |
| 981 | object was originally being written. Note we do write-through |
| 982 | first, so that if it fails, we don't write to the cache contents |
| 983 | that never made it to the target. */ |
| 984 | if (writebuf != NULL |
| 985 | && inferior_ptid != null_ptid |
| 986 | && target_dcache_init_p () |
| 987 | && (stack_cache_enabled_p () || code_cache_enabled_p ())) |
| 988 | { |
| 989 | DCACHE *dcache = target_dcache_get (); |
| 990 | |
| 991 | /* Note that writing to an area of memory which wasn't present |
| 992 | in the cache doesn't cause it to be loaded in. */ |
| 993 | dcache_update (dcache, res, memaddr, writebuf, *xfered_len); |
| 994 | } |
| 995 | |
| 996 | return res; |
| 997 | } |
| 998 | |
| 999 | /* Perform a partial memory transfer. |
| 1000 | For docs see target.h, to_xfer_partial. */ |
| 1001 | |
| 1002 | static enum target_xfer_status |
| 1003 | memory_xfer_partial_1 (struct target_ops *ops, enum target_object object, |
| 1004 | gdb_byte *readbuf, const gdb_byte *writebuf, ULONGEST memaddr, |
| 1005 | ULONGEST len, ULONGEST *xfered_len) |
| 1006 | { |
| 1007 | enum target_xfer_status res; |
| 1008 | ULONGEST reg_len; |
| 1009 | struct mem_region *region; |
| 1010 | struct inferior *inf; |
| 1011 | |
| 1012 | /* For accesses to unmapped overlay sections, read directly from |
| 1013 | files. Must do this first, as MEMADDR may need adjustment. */ |
| 1014 | if (readbuf != NULL && overlay_debugging) |
| 1015 | { |
| 1016 | struct obj_section *section = find_pc_overlay (memaddr); |
| 1017 | |
| 1018 | if (pc_in_unmapped_range (memaddr, section)) |
| 1019 | { |
| 1020 | struct target_section_table *table |
| 1021 | = target_get_section_table (ops); |
| 1022 | const char *section_name = section->the_bfd_section->name; |
| 1023 | |
| 1024 | memaddr = overlay_mapped_address (memaddr, section); |
| 1025 | return section_table_xfer_memory_partial (readbuf, writebuf, |
| 1026 | memaddr, len, xfered_len, |
| 1027 | table->sections, |
| 1028 | table->sections_end, |
| 1029 | section_name); |
| 1030 | } |
| 1031 | } |
| 1032 | |
| 1033 | /* Try the executable files, if "trust-readonly-sections" is set. */ |
| 1034 | if (readbuf != NULL && trust_readonly) |
| 1035 | { |
| 1036 | struct target_section *secp; |
| 1037 | struct target_section_table *table; |
| 1038 | |
| 1039 | secp = target_section_by_addr (ops, memaddr); |
| 1040 | if (secp != NULL |
| 1041 | && (bfd_section_flags (secp->the_bfd_section) & SEC_READONLY)) |
| 1042 | { |
| 1043 | table = target_get_section_table (ops); |
| 1044 | return section_table_xfer_memory_partial (readbuf, writebuf, |
| 1045 | memaddr, len, xfered_len, |
| 1046 | table->sections, |
| 1047 | table->sections_end, |
| 1048 | NULL); |
| 1049 | } |
| 1050 | } |
| 1051 | |
| 1052 | /* Try GDB's internal data cache. */ |
| 1053 | |
| 1054 | if (!memory_xfer_check_region (readbuf, writebuf, memaddr, len, ®_len, |
| 1055 | ®ion)) |
| 1056 | return TARGET_XFER_E_IO; |
| 1057 | |
| 1058 | if (inferior_ptid != null_ptid) |
| 1059 | inf = current_inferior (); |
| 1060 | else |
| 1061 | inf = NULL; |
| 1062 | |
| 1063 | if (inf != NULL |
| 1064 | && readbuf != NULL |
| 1065 | /* The dcache reads whole cache lines; that doesn't play well |
| 1066 | with reading from a trace buffer, because reading outside of |
| 1067 | the collected memory range fails. */ |
| 1068 | && get_traceframe_number () == -1 |
| 1069 | && (region->attrib.cache |
| 1070 | || (stack_cache_enabled_p () && object == TARGET_OBJECT_STACK_MEMORY) |
| 1071 | || (code_cache_enabled_p () && object == TARGET_OBJECT_CODE_MEMORY))) |
| 1072 | { |
| 1073 | DCACHE *dcache = target_dcache_get_or_init (); |
| 1074 | |
| 1075 | return dcache_read_memory_partial (ops, dcache, memaddr, readbuf, |
| 1076 | reg_len, xfered_len); |
| 1077 | } |
| 1078 | |
| 1079 | /* If none of those methods found the memory we wanted, fall back |
| 1080 | to a target partial transfer. Normally a single call to |
| 1081 | to_xfer_partial is enough; if it doesn't recognize an object |
| 1082 | it will call the to_xfer_partial of the next target down. |
| 1083 | But for memory this won't do. Memory is the only target |
| 1084 | object which can be read from more than one valid target. |
| 1085 | A core file, for instance, could have some of memory but |
| 1086 | delegate other bits to the target below it. So, we must |
| 1087 | manually try all targets. */ |
| 1088 | |
| 1089 | res = raw_memory_xfer_partial (ops, readbuf, writebuf, memaddr, reg_len, |
| 1090 | xfered_len); |
| 1091 | |
| 1092 | /* If we still haven't got anything, return the last error. We |
| 1093 | give up. */ |
| 1094 | return res; |
| 1095 | } |
| 1096 | |
| 1097 | /* Perform a partial memory transfer. For docs see target.h, |
| 1098 | to_xfer_partial. */ |
| 1099 | |
| 1100 | static enum target_xfer_status |
| 1101 | memory_xfer_partial (struct target_ops *ops, enum target_object object, |
| 1102 | gdb_byte *readbuf, const gdb_byte *writebuf, |
| 1103 | ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len) |
| 1104 | { |
| 1105 | enum target_xfer_status res; |
| 1106 | |
| 1107 | /* Zero length requests are ok and require no work. */ |
| 1108 | if (len == 0) |
| 1109 | return TARGET_XFER_EOF; |
| 1110 | |
| 1111 | memaddr = address_significant (target_gdbarch (), memaddr); |
| 1112 | |
| 1113 | /* Fill in READBUF with breakpoint shadows, or WRITEBUF with |
| 1114 | breakpoint insns, thus hiding out from higher layers whether |
| 1115 | there are software breakpoints inserted in the code stream. */ |
| 1116 | if (readbuf != NULL) |
| 1117 | { |
| 1118 | res = memory_xfer_partial_1 (ops, object, readbuf, NULL, memaddr, len, |
| 1119 | xfered_len); |
| 1120 | |
| 1121 | if (res == TARGET_XFER_OK && !show_memory_breakpoints) |
| 1122 | breakpoint_xfer_memory (readbuf, NULL, NULL, memaddr, *xfered_len); |
| 1123 | } |
| 1124 | else |
| 1125 | { |
| 1126 | /* A large write request is likely to be partially satisfied |
| 1127 | by memory_xfer_partial_1. We will continually malloc |
| 1128 | and free a copy of the entire write request for breakpoint |
| 1129 | shadow handling even though we only end up writing a small |
| 1130 | subset of it. Cap writes to a limit specified by the target |
| 1131 | to mitigate this. */ |
| 1132 | len = std::min (ops->get_memory_xfer_limit (), len); |
| 1133 | |
| 1134 | gdb::byte_vector buf (writebuf, writebuf + len); |
| 1135 | breakpoint_xfer_memory (NULL, buf.data (), writebuf, memaddr, len); |
| 1136 | res = memory_xfer_partial_1 (ops, object, NULL, buf.data (), memaddr, len, |
| 1137 | xfered_len); |
| 1138 | } |
| 1139 | |
| 1140 | return res; |
| 1141 | } |
| 1142 | |
| 1143 | scoped_restore_tmpl<int> |
| 1144 | make_scoped_restore_show_memory_breakpoints (int show) |
| 1145 | { |
| 1146 | return make_scoped_restore (&show_memory_breakpoints, show); |
| 1147 | } |
| 1148 | |
| 1149 | /* For docs see target.h, to_xfer_partial. */ |
| 1150 | |
| 1151 | enum target_xfer_status |
| 1152 | target_xfer_partial (struct target_ops *ops, |
| 1153 | enum target_object object, const char *annex, |
| 1154 | gdb_byte *readbuf, const gdb_byte *writebuf, |
| 1155 | ULONGEST offset, ULONGEST len, |
| 1156 | ULONGEST *xfered_len) |
| 1157 | { |
| 1158 | enum target_xfer_status retval; |
| 1159 | |
| 1160 | /* Transfer is done when LEN is zero. */ |
| 1161 | if (len == 0) |
| 1162 | return TARGET_XFER_EOF; |
| 1163 | |
| 1164 | if (writebuf && !may_write_memory) |
| 1165 | error (_("Writing to memory is not allowed (addr %s, len %s)"), |
| 1166 | core_addr_to_string_nz (offset), plongest (len)); |
| 1167 | |
| 1168 | *xfered_len = 0; |
| 1169 | |
| 1170 | /* If this is a memory transfer, let the memory-specific code |
| 1171 | have a look at it instead. Memory transfers are more |
| 1172 | complicated. */ |
| 1173 | if (object == TARGET_OBJECT_MEMORY || object == TARGET_OBJECT_STACK_MEMORY |
| 1174 | || object == TARGET_OBJECT_CODE_MEMORY) |
| 1175 | retval = memory_xfer_partial (ops, object, readbuf, |
| 1176 | writebuf, offset, len, xfered_len); |
| 1177 | else if (object == TARGET_OBJECT_RAW_MEMORY) |
| 1178 | { |
| 1179 | /* Skip/avoid accessing the target if the memory region |
| 1180 | attributes block the access. Check this here instead of in |
| 1181 | raw_memory_xfer_partial as otherwise we'd end up checking |
| 1182 | this twice in the case of the memory_xfer_partial path is |
| 1183 | taken; once before checking the dcache, and another in the |
| 1184 | tail call to raw_memory_xfer_partial. */ |
| 1185 | if (!memory_xfer_check_region (readbuf, writebuf, offset, len, &len, |
| 1186 | NULL)) |
| 1187 | return TARGET_XFER_E_IO; |
| 1188 | |
| 1189 | /* Request the normal memory object from other layers. */ |
| 1190 | retval = raw_memory_xfer_partial (ops, readbuf, writebuf, offset, len, |
| 1191 | xfered_len); |
| 1192 | } |
| 1193 | else |
| 1194 | retval = ops->xfer_partial (object, annex, readbuf, |
| 1195 | writebuf, offset, len, xfered_len); |
| 1196 | |
| 1197 | if (targetdebug) |
| 1198 | { |
| 1199 | const unsigned char *myaddr = NULL; |
| 1200 | |
| 1201 | fprintf_unfiltered (gdb_stdlog, |
| 1202 | "%s:target_xfer_partial " |
| 1203 | "(%d, %s, %s, %s, %s, %s) = %d, %s", |
| 1204 | ops->shortname (), |
| 1205 | (int) object, |
| 1206 | (annex ? annex : "(null)"), |
| 1207 | host_address_to_string (readbuf), |
| 1208 | host_address_to_string (writebuf), |
| 1209 | core_addr_to_string_nz (offset), |
| 1210 | pulongest (len), retval, |
| 1211 | pulongest (*xfered_len)); |
| 1212 | |
| 1213 | if (readbuf) |
| 1214 | myaddr = readbuf; |
| 1215 | if (writebuf) |
| 1216 | myaddr = writebuf; |
| 1217 | if (retval == TARGET_XFER_OK && myaddr != NULL) |
| 1218 | { |
| 1219 | int i; |
| 1220 | |
| 1221 | fputs_unfiltered (", bytes =", gdb_stdlog); |
| 1222 | for (i = 0; i < *xfered_len; i++) |
| 1223 | { |
| 1224 | if ((((intptr_t) &(myaddr[i])) & 0xf) == 0) |
| 1225 | { |
| 1226 | if (targetdebug < 2 && i > 0) |
| 1227 | { |
| 1228 | fprintf_unfiltered (gdb_stdlog, " ..."); |
| 1229 | break; |
| 1230 | } |
| 1231 | fprintf_unfiltered (gdb_stdlog, "\n"); |
| 1232 | } |
| 1233 | |
| 1234 | fprintf_unfiltered (gdb_stdlog, " %02x", myaddr[i] & 0xff); |
| 1235 | } |
| 1236 | } |
| 1237 | |
| 1238 | fputc_unfiltered ('\n', gdb_stdlog); |
| 1239 | } |
| 1240 | |
| 1241 | /* Check implementations of to_xfer_partial update *XFERED_LEN |
| 1242 | properly. Do assertion after printing debug messages, so that we |
| 1243 | can find more clues on assertion failure from debugging messages. */ |
| 1244 | if (retval == TARGET_XFER_OK || retval == TARGET_XFER_UNAVAILABLE) |
| 1245 | gdb_assert (*xfered_len > 0); |
| 1246 | |
| 1247 | return retval; |
| 1248 | } |
| 1249 | |
| 1250 | /* Read LEN bytes of target memory at address MEMADDR, placing the |
| 1251 | results in GDB's memory at MYADDR. Returns either 0 for success or |
| 1252 | -1 if any error occurs. |
| 1253 | |
| 1254 | If an error occurs, no guarantee is made about the contents of the data at |
| 1255 | MYADDR. In particular, the caller should not depend upon partial reads |
| 1256 | filling the buffer with good data. There is no way for the caller to know |
| 1257 | how much good data might have been transfered anyway. Callers that can |
| 1258 | deal with partial reads should call target_read (which will retry until |
| 1259 | it makes no progress, and then return how much was transferred). */ |
| 1260 | |
| 1261 | int |
| 1262 | target_read_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| 1263 | { |
| 1264 | if (target_read (current_top_target (), TARGET_OBJECT_MEMORY, NULL, |
| 1265 | myaddr, memaddr, len) == len) |
| 1266 | return 0; |
| 1267 | else |
| 1268 | return -1; |
| 1269 | } |
| 1270 | |
| 1271 | /* See target/target.h. */ |
| 1272 | |
| 1273 | int |
| 1274 | target_read_uint32 (CORE_ADDR memaddr, uint32_t *result) |
| 1275 | { |
| 1276 | gdb_byte buf[4]; |
| 1277 | int r; |
| 1278 | |
| 1279 | r = target_read_memory (memaddr, buf, sizeof buf); |
| 1280 | if (r != 0) |
| 1281 | return r; |
| 1282 | *result = extract_unsigned_integer (buf, sizeof buf, |
| 1283 | gdbarch_byte_order (target_gdbarch ())); |
| 1284 | return 0; |
| 1285 | } |
| 1286 | |
| 1287 | /* Like target_read_memory, but specify explicitly that this is a read |
| 1288 | from the target's raw memory. That is, this read bypasses the |
| 1289 | dcache, breakpoint shadowing, etc. */ |
| 1290 | |
| 1291 | int |
| 1292 | target_read_raw_memory (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| 1293 | { |
| 1294 | if (target_read (current_top_target (), TARGET_OBJECT_RAW_MEMORY, NULL, |
| 1295 | myaddr, memaddr, len) == len) |
| 1296 | return 0; |
| 1297 | else |
| 1298 | return -1; |
| 1299 | } |
| 1300 | |
| 1301 | /* Like target_read_memory, but specify explicitly that this is a read from |
| 1302 | the target's stack. This may trigger different cache behavior. */ |
| 1303 | |
| 1304 | int |
| 1305 | target_read_stack (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| 1306 | { |
| 1307 | if (target_read (current_top_target (), TARGET_OBJECT_STACK_MEMORY, NULL, |
| 1308 | myaddr, memaddr, len) == len) |
| 1309 | return 0; |
| 1310 | else |
| 1311 | return -1; |
| 1312 | } |
| 1313 | |
| 1314 | /* Like target_read_memory, but specify explicitly that this is a read from |
| 1315 | the target's code. This may trigger different cache behavior. */ |
| 1316 | |
| 1317 | int |
| 1318 | target_read_code (CORE_ADDR memaddr, gdb_byte *myaddr, ssize_t len) |
| 1319 | { |
| 1320 | if (target_read (current_top_target (), TARGET_OBJECT_CODE_MEMORY, NULL, |
| 1321 | myaddr, memaddr, len) == len) |
| 1322 | return 0; |
| 1323 | else |
| 1324 | return -1; |
| 1325 | } |
| 1326 | |
| 1327 | /* Write LEN bytes from MYADDR to target memory at address MEMADDR. |
| 1328 | Returns either 0 for success or -1 if any error occurs. If an |
| 1329 | error occurs, no guarantee is made about how much data got written. |
| 1330 | Callers that can deal with partial writes should call |
| 1331 | target_write. */ |
| 1332 | |
| 1333 | int |
| 1334 | target_write_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len) |
| 1335 | { |
| 1336 | if (target_write (current_top_target (), TARGET_OBJECT_MEMORY, NULL, |
| 1337 | myaddr, memaddr, len) == len) |
| 1338 | return 0; |
| 1339 | else |
| 1340 | return -1; |
| 1341 | } |
| 1342 | |
| 1343 | /* Write LEN bytes from MYADDR to target raw memory at address |
| 1344 | MEMADDR. Returns either 0 for success or -1 if any error occurs. |
| 1345 | If an error occurs, no guarantee is made about how much data got |
| 1346 | written. Callers that can deal with partial writes should call |
| 1347 | target_write. */ |
| 1348 | |
| 1349 | int |
| 1350 | target_write_raw_memory (CORE_ADDR memaddr, const gdb_byte *myaddr, ssize_t len) |
| 1351 | { |
| 1352 | if (target_write (current_top_target (), TARGET_OBJECT_RAW_MEMORY, NULL, |
| 1353 | myaddr, memaddr, len) == len) |
| 1354 | return 0; |
| 1355 | else |
| 1356 | return -1; |
| 1357 | } |
| 1358 | |
| 1359 | /* Fetch the target's memory map. */ |
| 1360 | |
| 1361 | std::vector<mem_region> |
| 1362 | target_memory_map (void) |
| 1363 | { |
| 1364 | std::vector<mem_region> result = current_top_target ()->memory_map (); |
| 1365 | if (result.empty ()) |
| 1366 | return result; |
| 1367 | |
| 1368 | std::sort (result.begin (), result.end ()); |
| 1369 | |
| 1370 | /* Check that regions do not overlap. Simultaneously assign |
| 1371 | a numbering for the "mem" commands to use to refer to |
| 1372 | each region. */ |
| 1373 | mem_region *last_one = NULL; |
| 1374 | for (size_t ix = 0; ix < result.size (); ix++) |
| 1375 | { |
| 1376 | mem_region *this_one = &result[ix]; |
| 1377 | this_one->number = ix; |
| 1378 | |
| 1379 | if (last_one != NULL && last_one->hi > this_one->lo) |
| 1380 | { |
| 1381 | warning (_("Overlapping regions in memory map: ignoring")); |
| 1382 | return std::vector<mem_region> (); |
| 1383 | } |
| 1384 | |
| 1385 | last_one = this_one; |
| 1386 | } |
| 1387 | |
| 1388 | return result; |
| 1389 | } |
| 1390 | |
| 1391 | void |
| 1392 | target_flash_erase (ULONGEST address, LONGEST length) |
| 1393 | { |
| 1394 | current_top_target ()->flash_erase (address, length); |
| 1395 | } |
| 1396 | |
| 1397 | void |
| 1398 | target_flash_done (void) |
| 1399 | { |
| 1400 | current_top_target ()->flash_done (); |
| 1401 | } |
| 1402 | |
| 1403 | static void |
| 1404 | show_trust_readonly (struct ui_file *file, int from_tty, |
| 1405 | struct cmd_list_element *c, const char *value) |
| 1406 | { |
| 1407 | fprintf_filtered (file, |
| 1408 | _("Mode for reading from readonly sections is %s.\n"), |
| 1409 | value); |
| 1410 | } |
| 1411 | |
| 1412 | /* Target vector read/write partial wrapper functions. */ |
| 1413 | |
| 1414 | static enum target_xfer_status |
| 1415 | target_read_partial (struct target_ops *ops, |
| 1416 | enum target_object object, |
| 1417 | const char *annex, gdb_byte *buf, |
| 1418 | ULONGEST offset, ULONGEST len, |
| 1419 | ULONGEST *xfered_len) |
| 1420 | { |
| 1421 | return target_xfer_partial (ops, object, annex, buf, NULL, offset, len, |
| 1422 | xfered_len); |
| 1423 | } |
| 1424 | |
| 1425 | static enum target_xfer_status |
| 1426 | target_write_partial (struct target_ops *ops, |
| 1427 | enum target_object object, |
| 1428 | const char *annex, const gdb_byte *buf, |
| 1429 | ULONGEST offset, LONGEST len, ULONGEST *xfered_len) |
| 1430 | { |
| 1431 | return target_xfer_partial (ops, object, annex, NULL, buf, offset, len, |
| 1432 | xfered_len); |
| 1433 | } |
| 1434 | |
| 1435 | /* Wrappers to perform the full transfer. */ |
| 1436 | |
| 1437 | /* For docs on target_read see target.h. */ |
| 1438 | |
| 1439 | LONGEST |
| 1440 | target_read (struct target_ops *ops, |
| 1441 | enum target_object object, |
| 1442 | const char *annex, gdb_byte *buf, |
| 1443 | ULONGEST offset, LONGEST len) |
| 1444 | { |
| 1445 | LONGEST xfered_total = 0; |
| 1446 | int unit_size = 1; |
| 1447 | |
| 1448 | /* If we are reading from a memory object, find the length of an addressable |
| 1449 | unit for that architecture. */ |
| 1450 | if (object == TARGET_OBJECT_MEMORY |
| 1451 | || object == TARGET_OBJECT_STACK_MEMORY |
| 1452 | || object == TARGET_OBJECT_CODE_MEMORY |
| 1453 | || object == TARGET_OBJECT_RAW_MEMORY) |
| 1454 | unit_size = gdbarch_addressable_memory_unit_size (target_gdbarch ()); |
| 1455 | |
| 1456 | while (xfered_total < len) |
| 1457 | { |
| 1458 | ULONGEST xfered_partial; |
| 1459 | enum target_xfer_status status; |
| 1460 | |
| 1461 | status = target_read_partial (ops, object, annex, |
| 1462 | buf + xfered_total * unit_size, |
| 1463 | offset + xfered_total, len - xfered_total, |
| 1464 | &xfered_partial); |
| 1465 | |
| 1466 | /* Call an observer, notifying them of the xfer progress? */ |
| 1467 | if (status == TARGET_XFER_EOF) |
| 1468 | return xfered_total; |
| 1469 | else if (status == TARGET_XFER_OK) |
| 1470 | { |
| 1471 | xfered_total += xfered_partial; |
| 1472 | QUIT; |
| 1473 | } |
| 1474 | else |
| 1475 | return TARGET_XFER_E_IO; |
| 1476 | |
| 1477 | } |
| 1478 | return len; |
| 1479 | } |
| 1480 | |
| 1481 | /* Assuming that the entire [begin, end) range of memory cannot be |
| 1482 | read, try to read whatever subrange is possible to read. |
| 1483 | |
| 1484 | The function returns, in RESULT, either zero or one memory block. |
| 1485 | If there's a readable subrange at the beginning, it is completely |
| 1486 | read and returned. Any further readable subrange will not be read. |
| 1487 | Otherwise, if there's a readable subrange at the end, it will be |
| 1488 | completely read and returned. Any readable subranges before it |
| 1489 | (obviously, not starting at the beginning), will be ignored. In |
| 1490 | other cases -- either no readable subrange, or readable subrange(s) |
| 1491 | that is neither at the beginning, or end, nothing is returned. |
| 1492 | |
| 1493 | The purpose of this function is to handle a read across a boundary |
| 1494 | of accessible memory in a case when memory map is not available. |
| 1495 | The above restrictions are fine for this case, but will give |
| 1496 | incorrect results if the memory is 'patchy'. However, supporting |
| 1497 | 'patchy' memory would require trying to read every single byte, |
| 1498 | and it seems unacceptable solution. Explicit memory map is |
| 1499 | recommended for this case -- and target_read_memory_robust will |
| 1500 | take care of reading multiple ranges then. */ |
| 1501 | |
| 1502 | static void |
| 1503 | read_whatever_is_readable (struct target_ops *ops, |
| 1504 | const ULONGEST begin, const ULONGEST end, |
| 1505 | int unit_size, |
| 1506 | std::vector<memory_read_result> *result) |
| 1507 | { |
| 1508 | ULONGEST current_begin = begin; |
| 1509 | ULONGEST current_end = end; |
| 1510 | int forward; |
| 1511 | ULONGEST xfered_len; |
| 1512 | |
| 1513 | /* If we previously failed to read 1 byte, nothing can be done here. */ |
| 1514 | if (end - begin <= 1) |
| 1515 | return; |
| 1516 | |
| 1517 | gdb::unique_xmalloc_ptr<gdb_byte> buf ((gdb_byte *) xmalloc (end - begin)); |
| 1518 | |
| 1519 | /* Check that either first or the last byte is readable, and give up |
| 1520 | if not. This heuristic is meant to permit reading accessible memory |
| 1521 | at the boundary of accessible region. */ |
| 1522 | if (target_read_partial (ops, TARGET_OBJECT_MEMORY, NULL, |
| 1523 | buf.get (), begin, 1, &xfered_len) == TARGET_XFER_OK) |
| 1524 | { |
| 1525 | forward = 1; |
| 1526 | ++current_begin; |
| 1527 | } |
| 1528 | else if (target_read_partial (ops, TARGET_OBJECT_MEMORY, NULL, |
| 1529 | buf.get () + (end - begin) - 1, end - 1, 1, |
| 1530 | &xfered_len) == TARGET_XFER_OK) |
| 1531 | { |
| 1532 | forward = 0; |
| 1533 | --current_end; |
| 1534 | } |
| 1535 | else |
| 1536 | return; |
| 1537 | |
| 1538 | /* Loop invariant is that the [current_begin, current_end) was previously |
| 1539 | found to be not readable as a whole. |
| 1540 | |
| 1541 | Note loop condition -- if the range has 1 byte, we can't divide the range |
| 1542 | so there's no point trying further. */ |
| 1543 | while (current_end - current_begin > 1) |
| 1544 | { |
| 1545 | ULONGEST first_half_begin, first_half_end; |
| 1546 | ULONGEST second_half_begin, second_half_end; |
| 1547 | LONGEST xfer; |
| 1548 | ULONGEST middle = current_begin + (current_end - current_begin) / 2; |
| 1549 | |
| 1550 | if (forward) |
| 1551 | { |
| 1552 | first_half_begin = current_begin; |
| 1553 | first_half_end = middle; |
| 1554 | second_half_begin = middle; |
| 1555 | second_half_end = current_end; |
| 1556 | } |
| 1557 | else |
| 1558 | { |
| 1559 | first_half_begin = middle; |
| 1560 | first_half_end = current_end; |
| 1561 | second_half_begin = current_begin; |
| 1562 | second_half_end = middle; |
| 1563 | } |
| 1564 | |
| 1565 | xfer = target_read (ops, TARGET_OBJECT_MEMORY, NULL, |
| 1566 | buf.get () + (first_half_begin - begin) * unit_size, |
| 1567 | first_half_begin, |
| 1568 | first_half_end - first_half_begin); |
| 1569 | |
| 1570 | if (xfer == first_half_end - first_half_begin) |
| 1571 | { |
| 1572 | /* This half reads up fine. So, the error must be in the |
| 1573 | other half. */ |
| 1574 | current_begin = second_half_begin; |
| 1575 | current_end = second_half_end; |
| 1576 | } |
| 1577 | else |
| 1578 | { |
| 1579 | /* This half is not readable. Because we've tried one byte, we |
| 1580 | know some part of this half if actually readable. Go to the next |
| 1581 | iteration to divide again and try to read. |
| 1582 | |
| 1583 | We don't handle the other half, because this function only tries |
| 1584 | to read a single readable subrange. */ |
| 1585 | current_begin = first_half_begin; |
| 1586 | current_end = first_half_end; |
| 1587 | } |
| 1588 | } |
| 1589 | |
| 1590 | if (forward) |
| 1591 | { |
| 1592 | /* The [begin, current_begin) range has been read. */ |
| 1593 | result->emplace_back (begin, current_end, std::move (buf)); |
| 1594 | } |
| 1595 | else |
| 1596 | { |
| 1597 | /* The [current_end, end) range has been read. */ |
| 1598 | LONGEST region_len = end - current_end; |
| 1599 | |
| 1600 | gdb::unique_xmalloc_ptr<gdb_byte> data |
| 1601 | ((gdb_byte *) xmalloc (region_len * unit_size)); |
| 1602 | memcpy (data.get (), buf.get () + (current_end - begin) * unit_size, |
| 1603 | region_len * unit_size); |
| 1604 | result->emplace_back (current_end, end, std::move (data)); |
| 1605 | } |
| 1606 | } |
| 1607 | |
| 1608 | std::vector<memory_read_result> |
| 1609 | read_memory_robust (struct target_ops *ops, |
| 1610 | const ULONGEST offset, const LONGEST len) |
| 1611 | { |
| 1612 | std::vector<memory_read_result> result; |
| 1613 | int unit_size = gdbarch_addressable_memory_unit_size (target_gdbarch ()); |
| 1614 | |
| 1615 | LONGEST xfered_total = 0; |
| 1616 | while (xfered_total < len) |
| 1617 | { |
| 1618 | struct mem_region *region = lookup_mem_region (offset + xfered_total); |
| 1619 | LONGEST region_len; |
| 1620 | |
| 1621 | /* If there is no explicit region, a fake one should be created. */ |
| 1622 | gdb_assert (region); |
| 1623 | |
| 1624 | if (region->hi == 0) |
| 1625 | region_len = len - xfered_total; |
| 1626 | else |
| 1627 | region_len = region->hi - offset; |
| 1628 | |
| 1629 | if (region->attrib.mode == MEM_NONE || region->attrib.mode == MEM_WO) |
| 1630 | { |
| 1631 | /* Cannot read this region. Note that we can end up here only |
| 1632 | if the region is explicitly marked inaccessible, or |
| 1633 | 'inaccessible-by-default' is in effect. */ |
| 1634 | xfered_total += region_len; |
| 1635 | } |
| 1636 | else |
| 1637 | { |
| 1638 | LONGEST to_read = std::min (len - xfered_total, region_len); |
| 1639 | gdb::unique_xmalloc_ptr<gdb_byte> buffer |
| 1640 | ((gdb_byte *) xmalloc (to_read * unit_size)); |
| 1641 | |
| 1642 | LONGEST xfered_partial = |
| 1643 | target_read (ops, TARGET_OBJECT_MEMORY, NULL, buffer.get (), |
| 1644 | offset + xfered_total, to_read); |
| 1645 | /* Call an observer, notifying them of the xfer progress? */ |
| 1646 | if (xfered_partial <= 0) |
| 1647 | { |
| 1648 | /* Got an error reading full chunk. See if maybe we can read |
| 1649 | some subrange. */ |
| 1650 | read_whatever_is_readable (ops, offset + xfered_total, |
| 1651 | offset + xfered_total + to_read, |
| 1652 | unit_size, &result); |
| 1653 | xfered_total += to_read; |
| 1654 | } |
| 1655 | else |
| 1656 | { |
| 1657 | result.emplace_back (offset + xfered_total, |
| 1658 | offset + xfered_total + xfered_partial, |
| 1659 | std::move (buffer)); |
| 1660 | xfered_total += xfered_partial; |
| 1661 | } |
| 1662 | QUIT; |
| 1663 | } |
| 1664 | } |
| 1665 | |
| 1666 | return result; |
| 1667 | } |
| 1668 | |
| 1669 | |
| 1670 | /* An alternative to target_write with progress callbacks. */ |
| 1671 | |
| 1672 | LONGEST |
| 1673 | target_write_with_progress (struct target_ops *ops, |
| 1674 | enum target_object object, |
| 1675 | const char *annex, const gdb_byte *buf, |
| 1676 | ULONGEST offset, LONGEST len, |
| 1677 | void (*progress) (ULONGEST, void *), void *baton) |
| 1678 | { |
| 1679 | LONGEST xfered_total = 0; |
| 1680 | int unit_size = 1; |
| 1681 | |
| 1682 | /* If we are writing to a memory object, find the length of an addressable |
| 1683 | unit for that architecture. */ |
| 1684 | if (object == TARGET_OBJECT_MEMORY |
| 1685 | || object == TARGET_OBJECT_STACK_MEMORY |
| 1686 | || object == TARGET_OBJECT_CODE_MEMORY |
| 1687 | || object == TARGET_OBJECT_RAW_MEMORY) |
| 1688 | unit_size = gdbarch_addressable_memory_unit_size (target_gdbarch ()); |
| 1689 | |
| 1690 | /* Give the progress callback a chance to set up. */ |
| 1691 | if (progress) |
| 1692 | (*progress) (0, baton); |
| 1693 | |
| 1694 | while (xfered_total < len) |
| 1695 | { |
| 1696 | ULONGEST xfered_partial; |
| 1697 | enum target_xfer_status status; |
| 1698 | |
| 1699 | status = target_write_partial (ops, object, annex, |
| 1700 | buf + xfered_total * unit_size, |
| 1701 | offset + xfered_total, len - xfered_total, |
| 1702 | &xfered_partial); |
| 1703 | |
| 1704 | if (status != TARGET_XFER_OK) |
| 1705 | return status == TARGET_XFER_EOF ? xfered_total : TARGET_XFER_E_IO; |
| 1706 | |
| 1707 | if (progress) |
| 1708 | (*progress) (xfered_partial, baton); |
| 1709 | |
| 1710 | xfered_total += xfered_partial; |
| 1711 | QUIT; |
| 1712 | } |
| 1713 | return len; |
| 1714 | } |
| 1715 | |
| 1716 | /* For docs on target_write see target.h. */ |
| 1717 | |
| 1718 | LONGEST |
| 1719 | target_write (struct target_ops *ops, |
| 1720 | enum target_object object, |
| 1721 | const char *annex, const gdb_byte *buf, |
| 1722 | ULONGEST offset, LONGEST len) |
| 1723 | { |
| 1724 | return target_write_with_progress (ops, object, annex, buf, offset, len, |
| 1725 | NULL, NULL); |
| 1726 | } |
| 1727 | |
| 1728 | /* Help for target_read_alloc and target_read_stralloc. See their comments |
| 1729 | for details. */ |
| 1730 | |
| 1731 | template <typename T> |
| 1732 | gdb::optional<gdb::def_vector<T>> |
| 1733 | target_read_alloc_1 (struct target_ops *ops, enum target_object object, |
| 1734 | const char *annex) |
| 1735 | { |
| 1736 | gdb::def_vector<T> buf; |
| 1737 | size_t buf_pos = 0; |
| 1738 | const int chunk = 4096; |
| 1739 | |
| 1740 | /* This function does not have a length parameter; it reads the |
| 1741 | entire OBJECT). Also, it doesn't support objects fetched partly |
| 1742 | from one target and partly from another (in a different stratum, |
| 1743 | e.g. a core file and an executable). Both reasons make it |
| 1744 | unsuitable for reading memory. */ |
| 1745 | gdb_assert (object != TARGET_OBJECT_MEMORY); |
| 1746 | |
| 1747 | /* Start by reading up to 4K at a time. The target will throttle |
| 1748 | this number down if necessary. */ |
| 1749 | while (1) |
| 1750 | { |
| 1751 | ULONGEST xfered_len; |
| 1752 | enum target_xfer_status status; |
| 1753 | |
| 1754 | buf.resize (buf_pos + chunk); |
| 1755 | |
| 1756 | status = target_read_partial (ops, object, annex, |
| 1757 | (gdb_byte *) &buf[buf_pos], |
| 1758 | buf_pos, chunk, |
| 1759 | &xfered_len); |
| 1760 | |
| 1761 | if (status == TARGET_XFER_EOF) |
| 1762 | { |
| 1763 | /* Read all there was. */ |
| 1764 | buf.resize (buf_pos); |
| 1765 | return buf; |
| 1766 | } |
| 1767 | else if (status != TARGET_XFER_OK) |
| 1768 | { |
| 1769 | /* An error occurred. */ |
| 1770 | return {}; |
| 1771 | } |
| 1772 | |
| 1773 | buf_pos += xfered_len; |
| 1774 | |
| 1775 | QUIT; |
| 1776 | } |
| 1777 | } |
| 1778 | |
| 1779 | /* See target.h */ |
| 1780 | |
| 1781 | gdb::optional<gdb::byte_vector> |
| 1782 | target_read_alloc (struct target_ops *ops, enum target_object object, |
| 1783 | const char *annex) |
| 1784 | { |
| 1785 | return target_read_alloc_1<gdb_byte> (ops, object, annex); |
| 1786 | } |
| 1787 | |
| 1788 | /* See target.h. */ |
| 1789 | |
| 1790 | gdb::optional<gdb::char_vector> |
| 1791 | target_read_stralloc (struct target_ops *ops, enum target_object object, |
| 1792 | const char *annex) |
| 1793 | { |
| 1794 | gdb::optional<gdb::char_vector> buf |
| 1795 | = target_read_alloc_1<char> (ops, object, annex); |
| 1796 | |
| 1797 | if (!buf) |
| 1798 | return {}; |
| 1799 | |
| 1800 | if (buf->empty () || buf->back () != '\0') |
| 1801 | buf->push_back ('\0'); |
| 1802 | |
| 1803 | /* Check for embedded NUL bytes; but allow trailing NULs. */ |
| 1804 | for (auto it = std::find (buf->begin (), buf->end (), '\0'); |
| 1805 | it != buf->end (); it++) |
| 1806 | if (*it != '\0') |
| 1807 | { |
| 1808 | warning (_("target object %d, annex %s, " |
| 1809 | "contained unexpected null characters"), |
| 1810 | (int) object, annex ? annex : "(none)"); |
| 1811 | break; |
| 1812 | } |
| 1813 | |
| 1814 | return buf; |
| 1815 | } |
| 1816 | |
| 1817 | /* Memory transfer methods. */ |
| 1818 | |
| 1819 | void |
| 1820 | get_target_memory (struct target_ops *ops, CORE_ADDR addr, gdb_byte *buf, |
| 1821 | LONGEST len) |
| 1822 | { |
| 1823 | /* This method is used to read from an alternate, non-current |
| 1824 | target. This read must bypass the overlay support (as symbols |
| 1825 | don't match this target), and GDB's internal cache (wrong cache |
| 1826 | for this target). */ |
| 1827 | if (target_read (ops, TARGET_OBJECT_RAW_MEMORY, NULL, buf, addr, len) |
| 1828 | != len) |
| 1829 | memory_error (TARGET_XFER_E_IO, addr); |
| 1830 | } |
| 1831 | |
| 1832 | ULONGEST |
| 1833 | get_target_memory_unsigned (struct target_ops *ops, CORE_ADDR addr, |
| 1834 | int len, enum bfd_endian byte_order) |
| 1835 | { |
| 1836 | gdb_byte buf[sizeof (ULONGEST)]; |
| 1837 | |
| 1838 | gdb_assert (len <= sizeof (buf)); |
| 1839 | get_target_memory (ops, addr, buf, len); |
| 1840 | return extract_unsigned_integer (buf, len, byte_order); |
| 1841 | } |
| 1842 | |
| 1843 | /* See target.h. */ |
| 1844 | |
| 1845 | int |
| 1846 | target_insert_breakpoint (struct gdbarch *gdbarch, |
| 1847 | struct bp_target_info *bp_tgt) |
| 1848 | { |
| 1849 | if (!may_insert_breakpoints) |
| 1850 | { |
| 1851 | warning (_("May not insert breakpoints")); |
| 1852 | return 1; |
| 1853 | } |
| 1854 | |
| 1855 | return current_top_target ()->insert_breakpoint (gdbarch, bp_tgt); |
| 1856 | } |
| 1857 | |
| 1858 | /* See target.h. */ |
| 1859 | |
| 1860 | int |
| 1861 | target_remove_breakpoint (struct gdbarch *gdbarch, |
| 1862 | struct bp_target_info *bp_tgt, |
| 1863 | enum remove_bp_reason reason) |
| 1864 | { |
| 1865 | /* This is kind of a weird case to handle, but the permission might |
| 1866 | have been changed after breakpoints were inserted - in which case |
| 1867 | we should just take the user literally and assume that any |
| 1868 | breakpoints should be left in place. */ |
| 1869 | if (!may_insert_breakpoints) |
| 1870 | { |
| 1871 | warning (_("May not remove breakpoints")); |
| 1872 | return 1; |
| 1873 | } |
| 1874 | |
| 1875 | return current_top_target ()->remove_breakpoint (gdbarch, bp_tgt, reason); |
| 1876 | } |
| 1877 | |
| 1878 | static void |
| 1879 | info_target_command (const char *args, int from_tty) |
| 1880 | { |
| 1881 | int has_all_mem = 0; |
| 1882 | |
| 1883 | if (symfile_objfile != NULL) |
| 1884 | printf_unfiltered (_("Symbols from \"%s\".\n"), |
| 1885 | objfile_name (symfile_objfile)); |
| 1886 | |
| 1887 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 1888 | { |
| 1889 | if (!t->has_memory ()) |
| 1890 | continue; |
| 1891 | |
| 1892 | if ((int) (t->stratum ()) <= (int) dummy_stratum) |
| 1893 | continue; |
| 1894 | if (has_all_mem) |
| 1895 | printf_unfiltered (_("\tWhile running this, " |
| 1896 | "GDB does not access memory from...\n")); |
| 1897 | printf_unfiltered ("%s:\n", t->longname ()); |
| 1898 | t->files_info (); |
| 1899 | has_all_mem = t->has_all_memory (); |
| 1900 | } |
| 1901 | } |
| 1902 | |
| 1903 | /* This function is called before any new inferior is created, e.g. |
| 1904 | by running a program, attaching, or connecting to a target. |
| 1905 | It cleans up any state from previous invocations which might |
| 1906 | change between runs. This is a subset of what target_preopen |
| 1907 | resets (things which might change between targets). */ |
| 1908 | |
| 1909 | void |
| 1910 | target_pre_inferior (int from_tty) |
| 1911 | { |
| 1912 | /* Clear out solib state. Otherwise the solib state of the previous |
| 1913 | inferior might have survived and is entirely wrong for the new |
| 1914 | target. This has been observed on GNU/Linux using glibc 2.3. How |
| 1915 | to reproduce: |
| 1916 | |
| 1917 | bash$ ./foo& |
| 1918 | [1] 4711 |
| 1919 | bash$ ./foo& |
| 1920 | [1] 4712 |
| 1921 | bash$ gdb ./foo |
| 1922 | [...] |
| 1923 | (gdb) attach 4711 |
| 1924 | (gdb) detach |
| 1925 | (gdb) attach 4712 |
| 1926 | Cannot access memory at address 0xdeadbeef |
| 1927 | */ |
| 1928 | |
| 1929 | /* In some OSs, the shared library list is the same/global/shared |
| 1930 | across inferiors. If code is shared between processes, so are |
| 1931 | memory regions and features. */ |
| 1932 | if (!gdbarch_has_global_solist (target_gdbarch ())) |
| 1933 | { |
| 1934 | no_shared_libraries (NULL, from_tty); |
| 1935 | |
| 1936 | invalidate_target_mem_regions (); |
| 1937 | |
| 1938 | target_clear_description (); |
| 1939 | } |
| 1940 | |
| 1941 | /* attach_flag may be set if the previous process associated with |
| 1942 | the inferior was attached to. */ |
| 1943 | current_inferior ()->attach_flag = 0; |
| 1944 | |
| 1945 | current_inferior ()->highest_thread_num = 0; |
| 1946 | |
| 1947 | agent_capability_invalidate (); |
| 1948 | } |
| 1949 | |
| 1950 | /* Callback for iterate_over_inferiors. Gets rid of the given |
| 1951 | inferior. */ |
| 1952 | |
| 1953 | static int |
| 1954 | dispose_inferior (struct inferior *inf, void *args) |
| 1955 | { |
| 1956 | /* Not all killed inferiors can, or will ever be, removed from the |
| 1957 | inferior list. Killed inferiors clearly don't need to be killed |
| 1958 | again, so, we're done. */ |
| 1959 | if (inf->pid == 0) |
| 1960 | return 0; |
| 1961 | |
| 1962 | thread_info *thread = any_thread_of_inferior (inf); |
| 1963 | if (thread != NULL) |
| 1964 | { |
| 1965 | switch_to_thread (thread); |
| 1966 | |
| 1967 | /* Core inferiors actually should be detached, not killed. */ |
| 1968 | if (target_has_execution) |
| 1969 | target_kill (); |
| 1970 | else |
| 1971 | target_detach (inf, 0); |
| 1972 | } |
| 1973 | |
| 1974 | return 0; |
| 1975 | } |
| 1976 | |
| 1977 | /* This is to be called by the open routine before it does |
| 1978 | anything. */ |
| 1979 | |
| 1980 | void |
| 1981 | target_preopen (int from_tty) |
| 1982 | { |
| 1983 | dont_repeat (); |
| 1984 | |
| 1985 | if (have_inferiors ()) |
| 1986 | { |
| 1987 | if (!from_tty |
| 1988 | || !have_live_inferiors () |
| 1989 | || query (_("A program is being debugged already. Kill it? "))) |
| 1990 | iterate_over_inferiors (dispose_inferior, NULL); |
| 1991 | else |
| 1992 | error (_("Program not killed.")); |
| 1993 | } |
| 1994 | |
| 1995 | /* Calling target_kill may remove the target from the stack. But if |
| 1996 | it doesn't (which seems like a win for UDI), remove it now. */ |
| 1997 | /* Leave the exec target, though. The user may be switching from a |
| 1998 | live process to a core of the same program. */ |
| 1999 | pop_all_targets_above (file_stratum); |
| 2000 | |
| 2001 | target_pre_inferior (from_tty); |
| 2002 | } |
| 2003 | |
| 2004 | /* See target.h. */ |
| 2005 | |
| 2006 | void |
| 2007 | target_detach (inferior *inf, int from_tty) |
| 2008 | { |
| 2009 | /* After we have detached, we will clear the register cache for this inferior |
| 2010 | by calling registers_changed_ptid. We must save the pid_ptid before |
| 2011 | detaching, as the target detach method will clear inf->pid. */ |
| 2012 | ptid_t save_pid_ptid = ptid_t (inf->pid); |
| 2013 | |
| 2014 | /* As long as some to_detach implementations rely on the current_inferior |
| 2015 | (either directly, or indirectly, like through target_gdbarch or by |
| 2016 | reading memory), INF needs to be the current inferior. When that |
| 2017 | requirement will become no longer true, then we can remove this |
| 2018 | assertion. */ |
| 2019 | gdb_assert (inf == current_inferior ()); |
| 2020 | |
| 2021 | if (gdbarch_has_global_breakpoints (target_gdbarch ())) |
| 2022 | /* Don't remove global breakpoints here. They're removed on |
| 2023 | disconnection from the target. */ |
| 2024 | ; |
| 2025 | else |
| 2026 | /* If we're in breakpoints-always-inserted mode, have to remove |
| 2027 | breakpoints before detaching. */ |
| 2028 | remove_breakpoints_inf (current_inferior ()); |
| 2029 | |
| 2030 | prepare_for_detach (); |
| 2031 | |
| 2032 | current_top_target ()->detach (inf, from_tty); |
| 2033 | |
| 2034 | registers_changed_ptid (save_pid_ptid); |
| 2035 | |
| 2036 | /* We have to ensure we have no frame cache left. Normally, |
| 2037 | registers_changed_ptid (save_pid_ptid) calls reinit_frame_cache when |
| 2038 | inferior_ptid matches save_pid_ptid, but in our case, it does not |
| 2039 | call it, as inferior_ptid has been reset. */ |
| 2040 | reinit_frame_cache (); |
| 2041 | } |
| 2042 | |
| 2043 | void |
| 2044 | target_disconnect (const char *args, int from_tty) |
| 2045 | { |
| 2046 | /* If we're in breakpoints-always-inserted mode or if breakpoints |
| 2047 | are global across processes, we have to remove them before |
| 2048 | disconnecting. */ |
| 2049 | remove_breakpoints (); |
| 2050 | |
| 2051 | current_top_target ()->disconnect (args, from_tty); |
| 2052 | } |
| 2053 | |
| 2054 | /* See target/target.h. */ |
| 2055 | |
| 2056 | ptid_t |
| 2057 | target_wait (ptid_t ptid, struct target_waitstatus *status, int options) |
| 2058 | { |
| 2059 | return current_top_target ()->wait (ptid, status, options); |
| 2060 | } |
| 2061 | |
| 2062 | /* See target.h. */ |
| 2063 | |
| 2064 | ptid_t |
| 2065 | default_target_wait (struct target_ops *ops, |
| 2066 | ptid_t ptid, struct target_waitstatus *status, |
| 2067 | int options) |
| 2068 | { |
| 2069 | status->kind = TARGET_WAITKIND_IGNORE; |
| 2070 | return minus_one_ptid; |
| 2071 | } |
| 2072 | |
| 2073 | std::string |
| 2074 | target_pid_to_str (ptid_t ptid) |
| 2075 | { |
| 2076 | return current_top_target ()->pid_to_str (ptid); |
| 2077 | } |
| 2078 | |
| 2079 | const char * |
| 2080 | target_thread_name (struct thread_info *info) |
| 2081 | { |
| 2082 | return current_top_target ()->thread_name (info); |
| 2083 | } |
| 2084 | |
| 2085 | struct thread_info * |
| 2086 | target_thread_handle_to_thread_info (const gdb_byte *thread_handle, |
| 2087 | int handle_len, |
| 2088 | struct inferior *inf) |
| 2089 | { |
| 2090 | return current_top_target ()->thread_handle_to_thread_info (thread_handle, |
| 2091 | handle_len, inf); |
| 2092 | } |
| 2093 | |
| 2094 | /* See target.h. */ |
| 2095 | |
| 2096 | gdb::byte_vector |
| 2097 | target_thread_info_to_thread_handle (struct thread_info *tip) |
| 2098 | { |
| 2099 | return current_top_target ()->thread_info_to_thread_handle (tip); |
| 2100 | } |
| 2101 | |
| 2102 | void |
| 2103 | target_resume (ptid_t ptid, int step, enum gdb_signal signal) |
| 2104 | { |
| 2105 | target_dcache_invalidate (); |
| 2106 | |
| 2107 | current_top_target ()->resume (ptid, step, signal); |
| 2108 | |
| 2109 | registers_changed_ptid (ptid); |
| 2110 | /* We only set the internal executing state here. The user/frontend |
| 2111 | running state is set at a higher level. This also clears the |
| 2112 | thread's stop_pc as side effect. */ |
| 2113 | set_executing (ptid, 1); |
| 2114 | clear_inline_frame_state (ptid); |
| 2115 | } |
| 2116 | |
| 2117 | /* If true, target_commit_resume is a nop. */ |
| 2118 | static int defer_target_commit_resume; |
| 2119 | |
| 2120 | /* See target.h. */ |
| 2121 | |
| 2122 | void |
| 2123 | target_commit_resume (void) |
| 2124 | { |
| 2125 | if (defer_target_commit_resume) |
| 2126 | return; |
| 2127 | |
| 2128 | current_top_target ()->commit_resume (); |
| 2129 | } |
| 2130 | |
| 2131 | /* See target.h. */ |
| 2132 | |
| 2133 | scoped_restore_tmpl<int> |
| 2134 | make_scoped_defer_target_commit_resume () |
| 2135 | { |
| 2136 | return make_scoped_restore (&defer_target_commit_resume, 1); |
| 2137 | } |
| 2138 | |
| 2139 | void |
| 2140 | target_pass_signals (gdb::array_view<const unsigned char> pass_signals) |
| 2141 | { |
| 2142 | current_top_target ()->pass_signals (pass_signals); |
| 2143 | } |
| 2144 | |
| 2145 | void |
| 2146 | target_program_signals (gdb::array_view<const unsigned char> program_signals) |
| 2147 | { |
| 2148 | current_top_target ()->program_signals (program_signals); |
| 2149 | } |
| 2150 | |
| 2151 | static int |
| 2152 | default_follow_fork (struct target_ops *self, int follow_child, |
| 2153 | int detach_fork) |
| 2154 | { |
| 2155 | /* Some target returned a fork event, but did not know how to follow it. */ |
| 2156 | internal_error (__FILE__, __LINE__, |
| 2157 | _("could not find a target to follow fork")); |
| 2158 | } |
| 2159 | |
| 2160 | /* Look through the list of possible targets for a target that can |
| 2161 | follow forks. */ |
| 2162 | |
| 2163 | int |
| 2164 | target_follow_fork (int follow_child, int detach_fork) |
| 2165 | { |
| 2166 | return current_top_target ()->follow_fork (follow_child, detach_fork); |
| 2167 | } |
| 2168 | |
| 2169 | /* Target wrapper for follow exec hook. */ |
| 2170 | |
| 2171 | void |
| 2172 | target_follow_exec (struct inferior *inf, const char *execd_pathname) |
| 2173 | { |
| 2174 | current_top_target ()->follow_exec (inf, execd_pathname); |
| 2175 | } |
| 2176 | |
| 2177 | static void |
| 2178 | default_mourn_inferior (struct target_ops *self) |
| 2179 | { |
| 2180 | internal_error (__FILE__, __LINE__, |
| 2181 | _("could not find a target to follow mourn inferior")); |
| 2182 | } |
| 2183 | |
| 2184 | void |
| 2185 | target_mourn_inferior (ptid_t ptid) |
| 2186 | { |
| 2187 | gdb_assert (ptid == inferior_ptid); |
| 2188 | current_top_target ()->mourn_inferior (); |
| 2189 | |
| 2190 | /* We no longer need to keep handles on any of the object files. |
| 2191 | Make sure to release them to avoid unnecessarily locking any |
| 2192 | of them while we're not actually debugging. */ |
| 2193 | bfd_cache_close_all (); |
| 2194 | } |
| 2195 | |
| 2196 | /* Look for a target which can describe architectural features, starting |
| 2197 | from TARGET. If we find one, return its description. */ |
| 2198 | |
| 2199 | const struct target_desc * |
| 2200 | target_read_description (struct target_ops *target) |
| 2201 | { |
| 2202 | return target->read_description (); |
| 2203 | } |
| 2204 | |
| 2205 | /* This implements a basic search of memory, reading target memory and |
| 2206 | performing the search here (as opposed to performing the search in on the |
| 2207 | target side with, for example, gdbserver). */ |
| 2208 | |
| 2209 | int |
| 2210 | simple_search_memory (struct target_ops *ops, |
| 2211 | CORE_ADDR start_addr, ULONGEST search_space_len, |
| 2212 | const gdb_byte *pattern, ULONGEST pattern_len, |
| 2213 | CORE_ADDR *found_addrp) |
| 2214 | { |
| 2215 | /* NOTE: also defined in find.c testcase. */ |
| 2216 | #define SEARCH_CHUNK_SIZE 16000 |
| 2217 | const unsigned chunk_size = SEARCH_CHUNK_SIZE; |
| 2218 | /* Buffer to hold memory contents for searching. */ |
| 2219 | unsigned search_buf_size; |
| 2220 | |
| 2221 | search_buf_size = chunk_size + pattern_len - 1; |
| 2222 | |
| 2223 | /* No point in trying to allocate a buffer larger than the search space. */ |
| 2224 | if (search_space_len < search_buf_size) |
| 2225 | search_buf_size = search_space_len; |
| 2226 | |
| 2227 | gdb::byte_vector search_buf (search_buf_size); |
| 2228 | |
| 2229 | /* Prime the search buffer. */ |
| 2230 | |
| 2231 | if (target_read (ops, TARGET_OBJECT_MEMORY, NULL, |
| 2232 | search_buf.data (), start_addr, search_buf_size) |
| 2233 | != search_buf_size) |
| 2234 | { |
| 2235 | warning (_("Unable to access %s bytes of target " |
| 2236 | "memory at %s, halting search."), |
| 2237 | pulongest (search_buf_size), hex_string (start_addr)); |
| 2238 | return -1; |
| 2239 | } |
| 2240 | |
| 2241 | /* Perform the search. |
| 2242 | |
| 2243 | The loop is kept simple by allocating [N + pattern-length - 1] bytes. |
| 2244 | When we've scanned N bytes we copy the trailing bytes to the start and |
| 2245 | read in another N bytes. */ |
| 2246 | |
| 2247 | while (search_space_len >= pattern_len) |
| 2248 | { |
| 2249 | gdb_byte *found_ptr; |
| 2250 | unsigned nr_search_bytes |
| 2251 | = std::min (search_space_len, (ULONGEST) search_buf_size); |
| 2252 | |
| 2253 | found_ptr = (gdb_byte *) memmem (search_buf.data (), nr_search_bytes, |
| 2254 | pattern, pattern_len); |
| 2255 | |
| 2256 | if (found_ptr != NULL) |
| 2257 | { |
| 2258 | CORE_ADDR found_addr = start_addr + (found_ptr - search_buf.data ()); |
| 2259 | |
| 2260 | *found_addrp = found_addr; |
| 2261 | return 1; |
| 2262 | } |
| 2263 | |
| 2264 | /* Not found in this chunk, skip to next chunk. */ |
| 2265 | |
| 2266 | /* Don't let search_space_len wrap here, it's unsigned. */ |
| 2267 | if (search_space_len >= chunk_size) |
| 2268 | search_space_len -= chunk_size; |
| 2269 | else |
| 2270 | search_space_len = 0; |
| 2271 | |
| 2272 | if (search_space_len >= pattern_len) |
| 2273 | { |
| 2274 | unsigned keep_len = search_buf_size - chunk_size; |
| 2275 | CORE_ADDR read_addr = start_addr + chunk_size + keep_len; |
| 2276 | int nr_to_read; |
| 2277 | |
| 2278 | /* Copy the trailing part of the previous iteration to the front |
| 2279 | of the buffer for the next iteration. */ |
| 2280 | gdb_assert (keep_len == pattern_len - 1); |
| 2281 | memcpy (&search_buf[0], &search_buf[chunk_size], keep_len); |
| 2282 | |
| 2283 | nr_to_read = std::min (search_space_len - keep_len, |
| 2284 | (ULONGEST) chunk_size); |
| 2285 | |
| 2286 | if (target_read (ops, TARGET_OBJECT_MEMORY, NULL, |
| 2287 | &search_buf[keep_len], read_addr, |
| 2288 | nr_to_read) != nr_to_read) |
| 2289 | { |
| 2290 | warning (_("Unable to access %s bytes of target " |
| 2291 | "memory at %s, halting search."), |
| 2292 | plongest (nr_to_read), |
| 2293 | hex_string (read_addr)); |
| 2294 | return -1; |
| 2295 | } |
| 2296 | |
| 2297 | start_addr += chunk_size; |
| 2298 | } |
| 2299 | } |
| 2300 | |
| 2301 | /* Not found. */ |
| 2302 | |
| 2303 | return 0; |
| 2304 | } |
| 2305 | |
| 2306 | /* Default implementation of memory-searching. */ |
| 2307 | |
| 2308 | static int |
| 2309 | default_search_memory (struct target_ops *self, |
| 2310 | CORE_ADDR start_addr, ULONGEST search_space_len, |
| 2311 | const gdb_byte *pattern, ULONGEST pattern_len, |
| 2312 | CORE_ADDR *found_addrp) |
| 2313 | { |
| 2314 | /* Start over from the top of the target stack. */ |
| 2315 | return simple_search_memory (current_top_target (), |
| 2316 | start_addr, search_space_len, |
| 2317 | pattern, pattern_len, found_addrp); |
| 2318 | } |
| 2319 | |
| 2320 | /* Search SEARCH_SPACE_LEN bytes beginning at START_ADDR for the |
| 2321 | sequence of bytes in PATTERN with length PATTERN_LEN. |
| 2322 | |
| 2323 | The result is 1 if found, 0 if not found, and -1 if there was an error |
| 2324 | requiring halting of the search (e.g. memory read error). |
| 2325 | If the pattern is found the address is recorded in FOUND_ADDRP. */ |
| 2326 | |
| 2327 | int |
| 2328 | target_search_memory (CORE_ADDR start_addr, ULONGEST search_space_len, |
| 2329 | const gdb_byte *pattern, ULONGEST pattern_len, |
| 2330 | CORE_ADDR *found_addrp) |
| 2331 | { |
| 2332 | return current_top_target ()->search_memory (start_addr, search_space_len, |
| 2333 | pattern, pattern_len, found_addrp); |
| 2334 | } |
| 2335 | |
| 2336 | /* Look through the currently pushed targets. If none of them will |
| 2337 | be able to restart the currently running process, issue an error |
| 2338 | message. */ |
| 2339 | |
| 2340 | void |
| 2341 | target_require_runnable (void) |
| 2342 | { |
| 2343 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 2344 | { |
| 2345 | /* If this target knows how to create a new program, then |
| 2346 | assume we will still be able to after killing the current |
| 2347 | one. Either killing and mourning will not pop T, or else |
| 2348 | find_default_run_target will find it again. */ |
| 2349 | if (t->can_create_inferior ()) |
| 2350 | return; |
| 2351 | |
| 2352 | /* Do not worry about targets at certain strata that can not |
| 2353 | create inferiors. Assume they will be pushed again if |
| 2354 | necessary, and continue to the process_stratum. */ |
| 2355 | if (t->stratum () > process_stratum) |
| 2356 | continue; |
| 2357 | |
| 2358 | error (_("The \"%s\" target does not support \"run\". " |
| 2359 | "Try \"help target\" or \"continue\"."), |
| 2360 | t->shortname ()); |
| 2361 | } |
| 2362 | |
| 2363 | /* This function is only called if the target is running. In that |
| 2364 | case there should have been a process_stratum target and it |
| 2365 | should either know how to create inferiors, or not... */ |
| 2366 | internal_error (__FILE__, __LINE__, _("No targets found")); |
| 2367 | } |
| 2368 | |
| 2369 | /* Whether GDB is allowed to fall back to the default run target for |
| 2370 | "run", "attach", etc. when no target is connected yet. */ |
| 2371 | static bool auto_connect_native_target = true; |
| 2372 | |
| 2373 | static void |
| 2374 | show_auto_connect_native_target (struct ui_file *file, int from_tty, |
| 2375 | struct cmd_list_element *c, const char *value) |
| 2376 | { |
| 2377 | fprintf_filtered (file, |
| 2378 | _("Whether GDB may automatically connect to the " |
| 2379 | "native target is %s.\n"), |
| 2380 | value); |
| 2381 | } |
| 2382 | |
| 2383 | /* A pointer to the target that can respond to "run" or "attach". |
| 2384 | Native targets are always singletons and instantiated early at GDB |
| 2385 | startup. */ |
| 2386 | static target_ops *the_native_target; |
| 2387 | |
| 2388 | /* See target.h. */ |
| 2389 | |
| 2390 | void |
| 2391 | set_native_target (target_ops *target) |
| 2392 | { |
| 2393 | if (the_native_target != NULL) |
| 2394 | internal_error (__FILE__, __LINE__, |
| 2395 | _("native target already set (\"%s\")."), |
| 2396 | the_native_target->longname ()); |
| 2397 | |
| 2398 | the_native_target = target; |
| 2399 | } |
| 2400 | |
| 2401 | /* See target.h. */ |
| 2402 | |
| 2403 | target_ops * |
| 2404 | get_native_target () |
| 2405 | { |
| 2406 | return the_native_target; |
| 2407 | } |
| 2408 | |
| 2409 | /* Look through the list of possible targets for a target that can |
| 2410 | execute a run or attach command without any other data. This is |
| 2411 | used to locate the default process stratum. |
| 2412 | |
| 2413 | If DO_MESG is not NULL, the result is always valid (error() is |
| 2414 | called for errors); else, return NULL on error. */ |
| 2415 | |
| 2416 | static struct target_ops * |
| 2417 | find_default_run_target (const char *do_mesg) |
| 2418 | { |
| 2419 | if (auto_connect_native_target && the_native_target != NULL) |
| 2420 | return the_native_target; |
| 2421 | |
| 2422 | if (do_mesg != NULL) |
| 2423 | error (_("Don't know how to %s. Try \"help target\"."), do_mesg); |
| 2424 | return NULL; |
| 2425 | } |
| 2426 | |
| 2427 | /* See target.h. */ |
| 2428 | |
| 2429 | struct target_ops * |
| 2430 | find_attach_target (void) |
| 2431 | { |
| 2432 | /* If a target on the current stack can attach, use it. */ |
| 2433 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 2434 | { |
| 2435 | if (t->can_attach ()) |
| 2436 | return t; |
| 2437 | } |
| 2438 | |
| 2439 | /* Otherwise, use the default run target for attaching. */ |
| 2440 | return find_default_run_target ("attach"); |
| 2441 | } |
| 2442 | |
| 2443 | /* See target.h. */ |
| 2444 | |
| 2445 | struct target_ops * |
| 2446 | find_run_target (void) |
| 2447 | { |
| 2448 | /* If a target on the current stack can run, use it. */ |
| 2449 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 2450 | { |
| 2451 | if (t->can_create_inferior ()) |
| 2452 | return t; |
| 2453 | } |
| 2454 | |
| 2455 | /* Otherwise, use the default run target. */ |
| 2456 | return find_default_run_target ("run"); |
| 2457 | } |
| 2458 | |
| 2459 | bool |
| 2460 | target_ops::info_proc (const char *args, enum info_proc_what what) |
| 2461 | { |
| 2462 | return false; |
| 2463 | } |
| 2464 | |
| 2465 | /* Implement the "info proc" command. */ |
| 2466 | |
| 2467 | int |
| 2468 | target_info_proc (const char *args, enum info_proc_what what) |
| 2469 | { |
| 2470 | struct target_ops *t; |
| 2471 | |
| 2472 | /* If we're already connected to something that can get us OS |
| 2473 | related data, use it. Otherwise, try using the native |
| 2474 | target. */ |
| 2475 | t = find_target_at (process_stratum); |
| 2476 | if (t == NULL) |
| 2477 | t = find_default_run_target (NULL); |
| 2478 | |
| 2479 | for (; t != NULL; t = t->beneath ()) |
| 2480 | { |
| 2481 | if (t->info_proc (args, what)) |
| 2482 | { |
| 2483 | if (targetdebug) |
| 2484 | fprintf_unfiltered (gdb_stdlog, |
| 2485 | "target_info_proc (\"%s\", %d)\n", args, what); |
| 2486 | |
| 2487 | return 1; |
| 2488 | } |
| 2489 | } |
| 2490 | |
| 2491 | return 0; |
| 2492 | } |
| 2493 | |
| 2494 | static int |
| 2495 | find_default_supports_disable_randomization (struct target_ops *self) |
| 2496 | { |
| 2497 | struct target_ops *t; |
| 2498 | |
| 2499 | t = find_default_run_target (NULL); |
| 2500 | if (t != NULL) |
| 2501 | return t->supports_disable_randomization (); |
| 2502 | return 0; |
| 2503 | } |
| 2504 | |
| 2505 | int |
| 2506 | target_supports_disable_randomization (void) |
| 2507 | { |
| 2508 | return current_top_target ()->supports_disable_randomization (); |
| 2509 | } |
| 2510 | |
| 2511 | /* See target/target.h. */ |
| 2512 | |
| 2513 | int |
| 2514 | target_supports_multi_process (void) |
| 2515 | { |
| 2516 | return current_top_target ()->supports_multi_process (); |
| 2517 | } |
| 2518 | |
| 2519 | /* See target.h. */ |
| 2520 | |
| 2521 | gdb::optional<gdb::char_vector> |
| 2522 | target_get_osdata (const char *type) |
| 2523 | { |
| 2524 | struct target_ops *t; |
| 2525 | |
| 2526 | /* If we're already connected to something that can get us OS |
| 2527 | related data, use it. Otherwise, try using the native |
| 2528 | target. */ |
| 2529 | t = find_target_at (process_stratum); |
| 2530 | if (t == NULL) |
| 2531 | t = find_default_run_target ("get OS data"); |
| 2532 | |
| 2533 | if (!t) |
| 2534 | return {}; |
| 2535 | |
| 2536 | return target_read_stralloc (t, TARGET_OBJECT_OSDATA, type); |
| 2537 | } |
| 2538 | |
| 2539 | |
| 2540 | /* Determine the current address space of thread PTID. */ |
| 2541 | |
| 2542 | struct address_space * |
| 2543 | target_thread_address_space (ptid_t ptid) |
| 2544 | { |
| 2545 | struct address_space *aspace; |
| 2546 | |
| 2547 | aspace = current_top_target ()->thread_address_space (ptid); |
| 2548 | gdb_assert (aspace != NULL); |
| 2549 | |
| 2550 | return aspace; |
| 2551 | } |
| 2552 | |
| 2553 | /* See target.h. */ |
| 2554 | |
| 2555 | target_ops * |
| 2556 | target_ops::beneath () const |
| 2557 | { |
| 2558 | return g_target_stack.find_beneath (this); |
| 2559 | } |
| 2560 | |
| 2561 | void |
| 2562 | target_ops::close () |
| 2563 | { |
| 2564 | } |
| 2565 | |
| 2566 | bool |
| 2567 | target_ops::can_attach () |
| 2568 | { |
| 2569 | return 0; |
| 2570 | } |
| 2571 | |
| 2572 | void |
| 2573 | target_ops::attach (const char *, int) |
| 2574 | { |
| 2575 | gdb_assert_not_reached ("target_ops::attach called"); |
| 2576 | } |
| 2577 | |
| 2578 | bool |
| 2579 | target_ops::can_create_inferior () |
| 2580 | { |
| 2581 | return 0; |
| 2582 | } |
| 2583 | |
| 2584 | void |
| 2585 | target_ops::create_inferior (const char *, const std::string &, |
| 2586 | char **, int) |
| 2587 | { |
| 2588 | gdb_assert_not_reached ("target_ops::create_inferior called"); |
| 2589 | } |
| 2590 | |
| 2591 | bool |
| 2592 | target_ops::can_run () |
| 2593 | { |
| 2594 | return false; |
| 2595 | } |
| 2596 | |
| 2597 | int |
| 2598 | target_can_run () |
| 2599 | { |
| 2600 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 2601 | { |
| 2602 | if (t->can_run ()) |
| 2603 | return 1; |
| 2604 | } |
| 2605 | |
| 2606 | return 0; |
| 2607 | } |
| 2608 | |
| 2609 | /* Target file operations. */ |
| 2610 | |
| 2611 | static struct target_ops * |
| 2612 | default_fileio_target (void) |
| 2613 | { |
| 2614 | struct target_ops *t; |
| 2615 | |
| 2616 | /* If we're already connected to something that can perform |
| 2617 | file I/O, use it. Otherwise, try using the native target. */ |
| 2618 | t = find_target_at (process_stratum); |
| 2619 | if (t != NULL) |
| 2620 | return t; |
| 2621 | return find_default_run_target ("file I/O"); |
| 2622 | } |
| 2623 | |
| 2624 | /* File handle for target file operations. */ |
| 2625 | |
| 2626 | struct fileio_fh_t |
| 2627 | { |
| 2628 | /* The target on which this file is open. NULL if the target is |
| 2629 | meanwhile closed while the handle is open. */ |
| 2630 | target_ops *target; |
| 2631 | |
| 2632 | /* The file descriptor on the target. */ |
| 2633 | int target_fd; |
| 2634 | |
| 2635 | /* Check whether this fileio_fh_t represents a closed file. */ |
| 2636 | bool is_closed () |
| 2637 | { |
| 2638 | return target_fd < 0; |
| 2639 | } |
| 2640 | }; |
| 2641 | |
| 2642 | /* Vector of currently open file handles. The value returned by |
| 2643 | target_fileio_open and passed as the FD argument to other |
| 2644 | target_fileio_* functions is an index into this vector. This |
| 2645 | vector's entries are never freed; instead, files are marked as |
| 2646 | closed, and the handle becomes available for reuse. */ |
| 2647 | static std::vector<fileio_fh_t> fileio_fhandles; |
| 2648 | |
| 2649 | /* Index into fileio_fhandles of the lowest handle that might be |
| 2650 | closed. This permits handle reuse without searching the whole |
| 2651 | list each time a new file is opened. */ |
| 2652 | static int lowest_closed_fd; |
| 2653 | |
| 2654 | /* Invalidate the target associated with open handles that were open |
| 2655 | on target TARG, since we're about to close (and maybe destroy) the |
| 2656 | target. The handles remain open from the client's perspective, but |
| 2657 | trying to do anything with them other than closing them will fail |
| 2658 | with EIO. */ |
| 2659 | |
| 2660 | static void |
| 2661 | fileio_handles_invalidate_target (target_ops *targ) |
| 2662 | { |
| 2663 | for (fileio_fh_t &fh : fileio_fhandles) |
| 2664 | if (fh.target == targ) |
| 2665 | fh.target = NULL; |
| 2666 | } |
| 2667 | |
| 2668 | /* Acquire a target fileio file descriptor. */ |
| 2669 | |
| 2670 | static int |
| 2671 | acquire_fileio_fd (target_ops *target, int target_fd) |
| 2672 | { |
| 2673 | /* Search for closed handles to reuse. */ |
| 2674 | for (; lowest_closed_fd < fileio_fhandles.size (); lowest_closed_fd++) |
| 2675 | { |
| 2676 | fileio_fh_t &fh = fileio_fhandles[lowest_closed_fd]; |
| 2677 | |
| 2678 | if (fh.is_closed ()) |
| 2679 | break; |
| 2680 | } |
| 2681 | |
| 2682 | /* Push a new handle if no closed handles were found. */ |
| 2683 | if (lowest_closed_fd == fileio_fhandles.size ()) |
| 2684 | fileio_fhandles.push_back (fileio_fh_t {target, target_fd}); |
| 2685 | else |
| 2686 | fileio_fhandles[lowest_closed_fd] = {target, target_fd}; |
| 2687 | |
| 2688 | /* Should no longer be marked closed. */ |
| 2689 | gdb_assert (!fileio_fhandles[lowest_closed_fd].is_closed ()); |
| 2690 | |
| 2691 | /* Return its index, and start the next lookup at |
| 2692 | the next index. */ |
| 2693 | return lowest_closed_fd++; |
| 2694 | } |
| 2695 | |
| 2696 | /* Release a target fileio file descriptor. */ |
| 2697 | |
| 2698 | static void |
| 2699 | release_fileio_fd (int fd, fileio_fh_t *fh) |
| 2700 | { |
| 2701 | fh->target_fd = -1; |
| 2702 | lowest_closed_fd = std::min (lowest_closed_fd, fd); |
| 2703 | } |
| 2704 | |
| 2705 | /* Return a pointer to the fileio_fhandle_t corresponding to FD. */ |
| 2706 | |
| 2707 | static fileio_fh_t * |
| 2708 | fileio_fd_to_fh (int fd) |
| 2709 | { |
| 2710 | return &fileio_fhandles[fd]; |
| 2711 | } |
| 2712 | |
| 2713 | |
| 2714 | /* Default implementations of file i/o methods. We don't want these |
| 2715 | to delegate automatically, because we need to know which target |
| 2716 | supported the method, in order to call it directly from within |
| 2717 | pread/pwrite, etc. */ |
| 2718 | |
| 2719 | int |
| 2720 | target_ops::fileio_open (struct inferior *inf, const char *filename, |
| 2721 | int flags, int mode, int warn_if_slow, |
| 2722 | int *target_errno) |
| 2723 | { |
| 2724 | *target_errno = FILEIO_ENOSYS; |
| 2725 | return -1; |
| 2726 | } |
| 2727 | |
| 2728 | int |
| 2729 | target_ops::fileio_pwrite (int fd, const gdb_byte *write_buf, int len, |
| 2730 | ULONGEST offset, int *target_errno) |
| 2731 | { |
| 2732 | *target_errno = FILEIO_ENOSYS; |
| 2733 | return -1; |
| 2734 | } |
| 2735 | |
| 2736 | int |
| 2737 | target_ops::fileio_pread (int fd, gdb_byte *read_buf, int len, |
| 2738 | ULONGEST offset, int *target_errno) |
| 2739 | { |
| 2740 | *target_errno = FILEIO_ENOSYS; |
| 2741 | return -1; |
| 2742 | } |
| 2743 | |
| 2744 | int |
| 2745 | target_ops::fileio_fstat (int fd, struct stat *sb, int *target_errno) |
| 2746 | { |
| 2747 | *target_errno = FILEIO_ENOSYS; |
| 2748 | return -1; |
| 2749 | } |
| 2750 | |
| 2751 | int |
| 2752 | target_ops::fileio_close (int fd, int *target_errno) |
| 2753 | { |
| 2754 | *target_errno = FILEIO_ENOSYS; |
| 2755 | return -1; |
| 2756 | } |
| 2757 | |
| 2758 | int |
| 2759 | target_ops::fileio_unlink (struct inferior *inf, const char *filename, |
| 2760 | int *target_errno) |
| 2761 | { |
| 2762 | *target_errno = FILEIO_ENOSYS; |
| 2763 | return -1; |
| 2764 | } |
| 2765 | |
| 2766 | gdb::optional<std::string> |
| 2767 | target_ops::fileio_readlink (struct inferior *inf, const char *filename, |
| 2768 | int *target_errno) |
| 2769 | { |
| 2770 | *target_errno = FILEIO_ENOSYS; |
| 2771 | return {}; |
| 2772 | } |
| 2773 | |
| 2774 | /* Helper for target_fileio_open and |
| 2775 | target_fileio_open_warn_if_slow. */ |
| 2776 | |
| 2777 | static int |
| 2778 | target_fileio_open_1 (struct inferior *inf, const char *filename, |
| 2779 | int flags, int mode, int warn_if_slow, |
| 2780 | int *target_errno) |
| 2781 | { |
| 2782 | for (target_ops *t = default_fileio_target (); t != NULL; t = t->beneath ()) |
| 2783 | { |
| 2784 | int fd = t->fileio_open (inf, filename, flags, mode, |
| 2785 | warn_if_slow, target_errno); |
| 2786 | |
| 2787 | if (fd == -1 && *target_errno == FILEIO_ENOSYS) |
| 2788 | continue; |
| 2789 | |
| 2790 | if (fd < 0) |
| 2791 | fd = -1; |
| 2792 | else |
| 2793 | fd = acquire_fileio_fd (t, fd); |
| 2794 | |
| 2795 | if (targetdebug) |
| 2796 | fprintf_unfiltered (gdb_stdlog, |
| 2797 | "target_fileio_open (%d,%s,0x%x,0%o,%d)" |
| 2798 | " = %d (%d)\n", |
| 2799 | inf == NULL ? 0 : inf->num, |
| 2800 | filename, flags, mode, |
| 2801 | warn_if_slow, fd, |
| 2802 | fd != -1 ? 0 : *target_errno); |
| 2803 | return fd; |
| 2804 | } |
| 2805 | |
| 2806 | *target_errno = FILEIO_ENOSYS; |
| 2807 | return -1; |
| 2808 | } |
| 2809 | |
| 2810 | /* See target.h. */ |
| 2811 | |
| 2812 | int |
| 2813 | target_fileio_open (struct inferior *inf, const char *filename, |
| 2814 | int flags, int mode, int *target_errno) |
| 2815 | { |
| 2816 | return target_fileio_open_1 (inf, filename, flags, mode, 0, |
| 2817 | target_errno); |
| 2818 | } |
| 2819 | |
| 2820 | /* See target.h. */ |
| 2821 | |
| 2822 | int |
| 2823 | target_fileio_open_warn_if_slow (struct inferior *inf, |
| 2824 | const char *filename, |
| 2825 | int flags, int mode, int *target_errno) |
| 2826 | { |
| 2827 | return target_fileio_open_1 (inf, filename, flags, mode, 1, |
| 2828 | target_errno); |
| 2829 | } |
| 2830 | |
| 2831 | /* See target.h. */ |
| 2832 | |
| 2833 | int |
| 2834 | target_fileio_pwrite (int fd, const gdb_byte *write_buf, int len, |
| 2835 | ULONGEST offset, int *target_errno) |
| 2836 | { |
| 2837 | fileio_fh_t *fh = fileio_fd_to_fh (fd); |
| 2838 | int ret = -1; |
| 2839 | |
| 2840 | if (fh->is_closed ()) |
| 2841 | *target_errno = EBADF; |
| 2842 | else if (fh->target == NULL) |
| 2843 | *target_errno = EIO; |
| 2844 | else |
| 2845 | ret = fh->target->fileio_pwrite (fh->target_fd, write_buf, |
| 2846 | len, offset, target_errno); |
| 2847 | |
| 2848 | if (targetdebug) |
| 2849 | fprintf_unfiltered (gdb_stdlog, |
| 2850 | "target_fileio_pwrite (%d,...,%d,%s) " |
| 2851 | "= %d (%d)\n", |
| 2852 | fd, len, pulongest (offset), |
| 2853 | ret, ret != -1 ? 0 : *target_errno); |
| 2854 | return ret; |
| 2855 | } |
| 2856 | |
| 2857 | /* See target.h. */ |
| 2858 | |
| 2859 | int |
| 2860 | target_fileio_pread (int fd, gdb_byte *read_buf, int len, |
| 2861 | ULONGEST offset, 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_pread (fh->target_fd, read_buf, |
| 2872 | len, offset, target_errno); |
| 2873 | |
| 2874 | if (targetdebug) |
| 2875 | fprintf_unfiltered (gdb_stdlog, |
| 2876 | "target_fileio_pread (%d,...,%d,%s) " |
| 2877 | "= %d (%d)\n", |
| 2878 | fd, len, pulongest (offset), |
| 2879 | ret, ret != -1 ? 0 : *target_errno); |
| 2880 | return ret; |
| 2881 | } |
| 2882 | |
| 2883 | /* See target.h. */ |
| 2884 | |
| 2885 | int |
| 2886 | target_fileio_fstat (int fd, struct stat *sb, int *target_errno) |
| 2887 | { |
| 2888 | fileio_fh_t *fh = fileio_fd_to_fh (fd); |
| 2889 | int ret = -1; |
| 2890 | |
| 2891 | if (fh->is_closed ()) |
| 2892 | *target_errno = EBADF; |
| 2893 | else if (fh->target == NULL) |
| 2894 | *target_errno = EIO; |
| 2895 | else |
| 2896 | ret = fh->target->fileio_fstat (fh->target_fd, sb, target_errno); |
| 2897 | |
| 2898 | if (targetdebug) |
| 2899 | fprintf_unfiltered (gdb_stdlog, |
| 2900 | "target_fileio_fstat (%d) = %d (%d)\n", |
| 2901 | fd, ret, ret != -1 ? 0 : *target_errno); |
| 2902 | return ret; |
| 2903 | } |
| 2904 | |
| 2905 | /* See target.h. */ |
| 2906 | |
| 2907 | int |
| 2908 | target_fileio_close (int fd, int *target_errno) |
| 2909 | { |
| 2910 | fileio_fh_t *fh = fileio_fd_to_fh (fd); |
| 2911 | int ret = -1; |
| 2912 | |
| 2913 | if (fh->is_closed ()) |
| 2914 | *target_errno = EBADF; |
| 2915 | else |
| 2916 | { |
| 2917 | if (fh->target != NULL) |
| 2918 | ret = fh->target->fileio_close (fh->target_fd, |
| 2919 | target_errno); |
| 2920 | else |
| 2921 | ret = 0; |
| 2922 | release_fileio_fd (fd, fh); |
| 2923 | } |
| 2924 | |
| 2925 | if (targetdebug) |
| 2926 | fprintf_unfiltered (gdb_stdlog, |
| 2927 | "target_fileio_close (%d) = %d (%d)\n", |
| 2928 | fd, ret, ret != -1 ? 0 : *target_errno); |
| 2929 | return ret; |
| 2930 | } |
| 2931 | |
| 2932 | /* See target.h. */ |
| 2933 | |
| 2934 | int |
| 2935 | target_fileio_unlink (struct inferior *inf, const char *filename, |
| 2936 | int *target_errno) |
| 2937 | { |
| 2938 | for (target_ops *t = default_fileio_target (); t != NULL; t = t->beneath ()) |
| 2939 | { |
| 2940 | int ret = t->fileio_unlink (inf, filename, target_errno); |
| 2941 | |
| 2942 | if (ret == -1 && *target_errno == FILEIO_ENOSYS) |
| 2943 | continue; |
| 2944 | |
| 2945 | if (targetdebug) |
| 2946 | fprintf_unfiltered (gdb_stdlog, |
| 2947 | "target_fileio_unlink (%d,%s)" |
| 2948 | " = %d (%d)\n", |
| 2949 | inf == NULL ? 0 : inf->num, filename, |
| 2950 | ret, ret != -1 ? 0 : *target_errno); |
| 2951 | return ret; |
| 2952 | } |
| 2953 | |
| 2954 | *target_errno = FILEIO_ENOSYS; |
| 2955 | return -1; |
| 2956 | } |
| 2957 | |
| 2958 | /* See target.h. */ |
| 2959 | |
| 2960 | gdb::optional<std::string> |
| 2961 | target_fileio_readlink (struct inferior *inf, const char *filename, |
| 2962 | int *target_errno) |
| 2963 | { |
| 2964 | for (target_ops *t = default_fileio_target (); t != NULL; t = t->beneath ()) |
| 2965 | { |
| 2966 | gdb::optional<std::string> ret |
| 2967 | = t->fileio_readlink (inf, filename, target_errno); |
| 2968 | |
| 2969 | if (!ret.has_value () && *target_errno == FILEIO_ENOSYS) |
| 2970 | continue; |
| 2971 | |
| 2972 | if (targetdebug) |
| 2973 | fprintf_unfiltered (gdb_stdlog, |
| 2974 | "target_fileio_readlink (%d,%s)" |
| 2975 | " = %s (%d)\n", |
| 2976 | inf == NULL ? 0 : inf->num, |
| 2977 | filename, ret ? ret->c_str () : "(nil)", |
| 2978 | ret ? 0 : *target_errno); |
| 2979 | return ret; |
| 2980 | } |
| 2981 | |
| 2982 | *target_errno = FILEIO_ENOSYS; |
| 2983 | return {}; |
| 2984 | } |
| 2985 | |
| 2986 | /* Like scoped_fd, but specific to target fileio. */ |
| 2987 | |
| 2988 | class scoped_target_fd |
| 2989 | { |
| 2990 | public: |
| 2991 | explicit scoped_target_fd (int fd) noexcept |
| 2992 | : m_fd (fd) |
| 2993 | { |
| 2994 | } |
| 2995 | |
| 2996 | ~scoped_target_fd () |
| 2997 | { |
| 2998 | if (m_fd >= 0) |
| 2999 | { |
| 3000 | int target_errno; |
| 3001 | |
| 3002 | target_fileio_close (m_fd, &target_errno); |
| 3003 | } |
| 3004 | } |
| 3005 | |
| 3006 | DISABLE_COPY_AND_ASSIGN (scoped_target_fd); |
| 3007 | |
| 3008 | int get () const noexcept |
| 3009 | { |
| 3010 | return m_fd; |
| 3011 | } |
| 3012 | |
| 3013 | private: |
| 3014 | int m_fd; |
| 3015 | }; |
| 3016 | |
| 3017 | /* Read target file FILENAME, in the filesystem as seen by INF. If |
| 3018 | INF is NULL, use the filesystem seen by the debugger (GDB or, for |
| 3019 | remote targets, the remote stub). Store the result in *BUF_P and |
| 3020 | return the size of the transferred data. PADDING additional bytes |
| 3021 | are available in *BUF_P. This is a helper function for |
| 3022 | target_fileio_read_alloc; see the declaration of that function for |
| 3023 | more information. */ |
| 3024 | |
| 3025 | static LONGEST |
| 3026 | target_fileio_read_alloc_1 (struct inferior *inf, const char *filename, |
| 3027 | gdb_byte **buf_p, int padding) |
| 3028 | { |
| 3029 | size_t buf_alloc, buf_pos; |
| 3030 | gdb_byte *buf; |
| 3031 | LONGEST n; |
| 3032 | int target_errno; |
| 3033 | |
| 3034 | scoped_target_fd fd (target_fileio_open (inf, filename, FILEIO_O_RDONLY, |
| 3035 | 0700, &target_errno)); |
| 3036 | if (fd.get () == -1) |
| 3037 | return -1; |
| 3038 | |
| 3039 | /* Start by reading up to 4K at a time. The target will throttle |
| 3040 | this number down if necessary. */ |
| 3041 | buf_alloc = 4096; |
| 3042 | buf = (gdb_byte *) xmalloc (buf_alloc); |
| 3043 | buf_pos = 0; |
| 3044 | while (1) |
| 3045 | { |
| 3046 | n = target_fileio_pread (fd.get (), &buf[buf_pos], |
| 3047 | buf_alloc - buf_pos - padding, buf_pos, |
| 3048 | &target_errno); |
| 3049 | if (n < 0) |
| 3050 | { |
| 3051 | /* An error occurred. */ |
| 3052 | xfree (buf); |
| 3053 | return -1; |
| 3054 | } |
| 3055 | else if (n == 0) |
| 3056 | { |
| 3057 | /* Read all there was. */ |
| 3058 | if (buf_pos == 0) |
| 3059 | xfree (buf); |
| 3060 | else |
| 3061 | *buf_p = buf; |
| 3062 | return buf_pos; |
| 3063 | } |
| 3064 | |
| 3065 | buf_pos += n; |
| 3066 | |
| 3067 | /* If the buffer is filling up, expand it. */ |
| 3068 | if (buf_alloc < buf_pos * 2) |
| 3069 | { |
| 3070 | buf_alloc *= 2; |
| 3071 | buf = (gdb_byte *) xrealloc (buf, buf_alloc); |
| 3072 | } |
| 3073 | |
| 3074 | QUIT; |
| 3075 | } |
| 3076 | } |
| 3077 | |
| 3078 | /* See target.h. */ |
| 3079 | |
| 3080 | LONGEST |
| 3081 | target_fileio_read_alloc (struct inferior *inf, const char *filename, |
| 3082 | gdb_byte **buf_p) |
| 3083 | { |
| 3084 | return target_fileio_read_alloc_1 (inf, filename, buf_p, 0); |
| 3085 | } |
| 3086 | |
| 3087 | /* See target.h. */ |
| 3088 | |
| 3089 | gdb::unique_xmalloc_ptr<char> |
| 3090 | target_fileio_read_stralloc (struct inferior *inf, const char *filename) |
| 3091 | { |
| 3092 | gdb_byte *buffer; |
| 3093 | char *bufstr; |
| 3094 | LONGEST i, transferred; |
| 3095 | |
| 3096 | transferred = target_fileio_read_alloc_1 (inf, filename, &buffer, 1); |
| 3097 | bufstr = (char *) buffer; |
| 3098 | |
| 3099 | if (transferred < 0) |
| 3100 | return gdb::unique_xmalloc_ptr<char> (nullptr); |
| 3101 | |
| 3102 | if (transferred == 0) |
| 3103 | return make_unique_xstrdup (""); |
| 3104 | |
| 3105 | bufstr[transferred] = 0; |
| 3106 | |
| 3107 | /* Check for embedded NUL bytes; but allow trailing NULs. */ |
| 3108 | for (i = strlen (bufstr); i < transferred; i++) |
| 3109 | if (bufstr[i] != 0) |
| 3110 | { |
| 3111 | warning (_("target file %s " |
| 3112 | "contained unexpected null characters"), |
| 3113 | filename); |
| 3114 | break; |
| 3115 | } |
| 3116 | |
| 3117 | return gdb::unique_xmalloc_ptr<char> (bufstr); |
| 3118 | } |
| 3119 | |
| 3120 | |
| 3121 | static int |
| 3122 | default_region_ok_for_hw_watchpoint (struct target_ops *self, |
| 3123 | CORE_ADDR addr, int len) |
| 3124 | { |
| 3125 | return (len <= gdbarch_ptr_bit (target_gdbarch ()) / TARGET_CHAR_BIT); |
| 3126 | } |
| 3127 | |
| 3128 | static int |
| 3129 | default_watchpoint_addr_within_range (struct target_ops *target, |
| 3130 | CORE_ADDR addr, |
| 3131 | CORE_ADDR start, int length) |
| 3132 | { |
| 3133 | return addr >= start && addr < start + length; |
| 3134 | } |
| 3135 | |
| 3136 | /* See target.h. */ |
| 3137 | |
| 3138 | target_ops * |
| 3139 | target_stack::find_beneath (const target_ops *t) const |
| 3140 | { |
| 3141 | /* Look for a non-empty slot at stratum levels beneath T's. */ |
| 3142 | for (int stratum = t->stratum () - 1; stratum >= 0; --stratum) |
| 3143 | if (m_stack[stratum] != NULL) |
| 3144 | return m_stack[stratum]; |
| 3145 | |
| 3146 | return NULL; |
| 3147 | } |
| 3148 | |
| 3149 | /* See target.h. */ |
| 3150 | |
| 3151 | struct target_ops * |
| 3152 | find_target_at (enum strata stratum) |
| 3153 | { |
| 3154 | return g_target_stack.at (stratum); |
| 3155 | } |
| 3156 | |
| 3157 | \f |
| 3158 | |
| 3159 | /* See target.h */ |
| 3160 | |
| 3161 | void |
| 3162 | target_announce_detach (int from_tty) |
| 3163 | { |
| 3164 | pid_t pid; |
| 3165 | const char *exec_file; |
| 3166 | |
| 3167 | if (!from_tty) |
| 3168 | return; |
| 3169 | |
| 3170 | exec_file = get_exec_file (0); |
| 3171 | if (exec_file == NULL) |
| 3172 | exec_file = ""; |
| 3173 | |
| 3174 | pid = inferior_ptid.pid (); |
| 3175 | printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file, |
| 3176 | target_pid_to_str (ptid_t (pid)).c_str ()); |
| 3177 | } |
| 3178 | |
| 3179 | /* The inferior process has died. Long live the inferior! */ |
| 3180 | |
| 3181 | void |
| 3182 | generic_mourn_inferior (void) |
| 3183 | { |
| 3184 | inferior *inf = current_inferior (); |
| 3185 | |
| 3186 | inferior_ptid = null_ptid; |
| 3187 | |
| 3188 | /* Mark breakpoints uninserted in case something tries to delete a |
| 3189 | breakpoint while we delete the inferior's threads (which would |
| 3190 | fail, since the inferior is long gone). */ |
| 3191 | mark_breakpoints_out (); |
| 3192 | |
| 3193 | if (inf->pid != 0) |
| 3194 | exit_inferior (inf); |
| 3195 | |
| 3196 | /* Note this wipes step-resume breakpoints, so needs to be done |
| 3197 | after exit_inferior, which ends up referencing the step-resume |
| 3198 | breakpoints through clear_thread_inferior_resources. */ |
| 3199 | breakpoint_init_inferior (inf_exited); |
| 3200 | |
| 3201 | registers_changed (); |
| 3202 | |
| 3203 | reopen_exec_file (); |
| 3204 | reinit_frame_cache (); |
| 3205 | |
| 3206 | if (deprecated_detach_hook) |
| 3207 | deprecated_detach_hook (); |
| 3208 | } |
| 3209 | \f |
| 3210 | /* Convert a normal process ID to a string. Returns the string in a |
| 3211 | static buffer. */ |
| 3212 | |
| 3213 | std::string |
| 3214 | normal_pid_to_str (ptid_t ptid) |
| 3215 | { |
| 3216 | return string_printf ("process %d", ptid.pid ()); |
| 3217 | } |
| 3218 | |
| 3219 | static std::string |
| 3220 | default_pid_to_str (struct target_ops *ops, ptid_t ptid) |
| 3221 | { |
| 3222 | return normal_pid_to_str (ptid); |
| 3223 | } |
| 3224 | |
| 3225 | /* Error-catcher for target_find_memory_regions. */ |
| 3226 | static int |
| 3227 | dummy_find_memory_regions (struct target_ops *self, |
| 3228 | find_memory_region_ftype ignore1, void *ignore2) |
| 3229 | { |
| 3230 | error (_("Command not implemented for this target.")); |
| 3231 | return 0; |
| 3232 | } |
| 3233 | |
| 3234 | /* Error-catcher for target_make_corefile_notes. */ |
| 3235 | static char * |
| 3236 | dummy_make_corefile_notes (struct target_ops *self, |
| 3237 | bfd *ignore1, int *ignore2) |
| 3238 | { |
| 3239 | error (_("Command not implemented for this target.")); |
| 3240 | return NULL; |
| 3241 | } |
| 3242 | |
| 3243 | #include "target-delegates.c" |
| 3244 | |
| 3245 | /* The initial current target, so that there is always a semi-valid |
| 3246 | current target. */ |
| 3247 | |
| 3248 | static dummy_target the_dummy_target; |
| 3249 | |
| 3250 | static const target_info dummy_target_info = { |
| 3251 | "None", |
| 3252 | N_("None"), |
| 3253 | "" |
| 3254 | }; |
| 3255 | |
| 3256 | strata |
| 3257 | dummy_target::stratum () const |
| 3258 | { |
| 3259 | return dummy_stratum; |
| 3260 | } |
| 3261 | |
| 3262 | strata |
| 3263 | debug_target::stratum () const |
| 3264 | { |
| 3265 | return debug_stratum; |
| 3266 | } |
| 3267 | |
| 3268 | const target_info & |
| 3269 | dummy_target::info () const |
| 3270 | { |
| 3271 | return dummy_target_info; |
| 3272 | } |
| 3273 | |
| 3274 | const target_info & |
| 3275 | debug_target::info () const |
| 3276 | { |
| 3277 | return beneath ()->info (); |
| 3278 | } |
| 3279 | |
| 3280 | \f |
| 3281 | |
| 3282 | void |
| 3283 | target_close (struct target_ops *targ) |
| 3284 | { |
| 3285 | gdb_assert (!target_is_pushed (targ)); |
| 3286 | |
| 3287 | fileio_handles_invalidate_target (targ); |
| 3288 | |
| 3289 | targ->close (); |
| 3290 | |
| 3291 | if (targetdebug) |
| 3292 | fprintf_unfiltered (gdb_stdlog, "target_close ()\n"); |
| 3293 | } |
| 3294 | |
| 3295 | int |
| 3296 | target_thread_alive (ptid_t ptid) |
| 3297 | { |
| 3298 | return current_top_target ()->thread_alive (ptid); |
| 3299 | } |
| 3300 | |
| 3301 | void |
| 3302 | target_update_thread_list (void) |
| 3303 | { |
| 3304 | current_top_target ()->update_thread_list (); |
| 3305 | } |
| 3306 | |
| 3307 | void |
| 3308 | target_stop (ptid_t ptid) |
| 3309 | { |
| 3310 | if (!may_stop) |
| 3311 | { |
| 3312 | warning (_("May not interrupt or stop the target, ignoring attempt")); |
| 3313 | return; |
| 3314 | } |
| 3315 | |
| 3316 | current_top_target ()->stop (ptid); |
| 3317 | } |
| 3318 | |
| 3319 | void |
| 3320 | target_interrupt () |
| 3321 | { |
| 3322 | if (!may_stop) |
| 3323 | { |
| 3324 | warning (_("May not interrupt or stop the target, ignoring attempt")); |
| 3325 | return; |
| 3326 | } |
| 3327 | |
| 3328 | current_top_target ()->interrupt (); |
| 3329 | } |
| 3330 | |
| 3331 | /* See target.h. */ |
| 3332 | |
| 3333 | void |
| 3334 | target_pass_ctrlc (void) |
| 3335 | { |
| 3336 | current_top_target ()->pass_ctrlc (); |
| 3337 | } |
| 3338 | |
| 3339 | /* See target.h. */ |
| 3340 | |
| 3341 | void |
| 3342 | default_target_pass_ctrlc (struct target_ops *ops) |
| 3343 | { |
| 3344 | target_interrupt (); |
| 3345 | } |
| 3346 | |
| 3347 | /* See target/target.h. */ |
| 3348 | |
| 3349 | void |
| 3350 | target_stop_and_wait (ptid_t ptid) |
| 3351 | { |
| 3352 | struct target_waitstatus status; |
| 3353 | bool was_non_stop = non_stop; |
| 3354 | |
| 3355 | non_stop = true; |
| 3356 | target_stop (ptid); |
| 3357 | |
| 3358 | memset (&status, 0, sizeof (status)); |
| 3359 | target_wait (ptid, &status, 0); |
| 3360 | |
| 3361 | non_stop = was_non_stop; |
| 3362 | } |
| 3363 | |
| 3364 | /* See target/target.h. */ |
| 3365 | |
| 3366 | void |
| 3367 | target_continue_no_signal (ptid_t ptid) |
| 3368 | { |
| 3369 | target_resume (ptid, 0, GDB_SIGNAL_0); |
| 3370 | } |
| 3371 | |
| 3372 | /* See target/target.h. */ |
| 3373 | |
| 3374 | void |
| 3375 | target_continue (ptid_t ptid, enum gdb_signal signal) |
| 3376 | { |
| 3377 | target_resume (ptid, 0, signal); |
| 3378 | } |
| 3379 | |
| 3380 | /* Concatenate ELEM to LIST, a comma-separated list. */ |
| 3381 | |
| 3382 | static void |
| 3383 | str_comma_list_concat_elem (std::string *list, const char *elem) |
| 3384 | { |
| 3385 | if (!list->empty ()) |
| 3386 | list->append (", "); |
| 3387 | |
| 3388 | list->append (elem); |
| 3389 | } |
| 3390 | |
| 3391 | /* Helper for target_options_to_string. If OPT is present in |
| 3392 | TARGET_OPTIONS, append the OPT_STR (string version of OPT) in RET. |
| 3393 | OPT is removed from TARGET_OPTIONS. */ |
| 3394 | |
| 3395 | static void |
| 3396 | do_option (int *target_options, std::string *ret, |
| 3397 | int opt, const char *opt_str) |
| 3398 | { |
| 3399 | if ((*target_options & opt) != 0) |
| 3400 | { |
| 3401 | str_comma_list_concat_elem (ret, opt_str); |
| 3402 | *target_options &= ~opt; |
| 3403 | } |
| 3404 | } |
| 3405 | |
| 3406 | /* See target.h. */ |
| 3407 | |
| 3408 | std::string |
| 3409 | target_options_to_string (int target_options) |
| 3410 | { |
| 3411 | std::string ret; |
| 3412 | |
| 3413 | #define DO_TARG_OPTION(OPT) \ |
| 3414 | do_option (&target_options, &ret, OPT, #OPT) |
| 3415 | |
| 3416 | DO_TARG_OPTION (TARGET_WNOHANG); |
| 3417 | |
| 3418 | if (target_options != 0) |
| 3419 | str_comma_list_concat_elem (&ret, "unknown???"); |
| 3420 | |
| 3421 | return ret; |
| 3422 | } |
| 3423 | |
| 3424 | void |
| 3425 | target_fetch_registers (struct regcache *regcache, int regno) |
| 3426 | { |
| 3427 | current_top_target ()->fetch_registers (regcache, regno); |
| 3428 | if (targetdebug) |
| 3429 | regcache->debug_print_register ("target_fetch_registers", regno); |
| 3430 | } |
| 3431 | |
| 3432 | void |
| 3433 | target_store_registers (struct regcache *regcache, int regno) |
| 3434 | { |
| 3435 | if (!may_write_registers) |
| 3436 | error (_("Writing to registers is not allowed (regno %d)"), regno); |
| 3437 | |
| 3438 | current_top_target ()->store_registers (regcache, regno); |
| 3439 | if (targetdebug) |
| 3440 | { |
| 3441 | regcache->debug_print_register ("target_store_registers", regno); |
| 3442 | } |
| 3443 | } |
| 3444 | |
| 3445 | int |
| 3446 | target_core_of_thread (ptid_t ptid) |
| 3447 | { |
| 3448 | return current_top_target ()->core_of_thread (ptid); |
| 3449 | } |
| 3450 | |
| 3451 | int |
| 3452 | simple_verify_memory (struct target_ops *ops, |
| 3453 | const gdb_byte *data, CORE_ADDR lma, ULONGEST size) |
| 3454 | { |
| 3455 | LONGEST total_xfered = 0; |
| 3456 | |
| 3457 | while (total_xfered < size) |
| 3458 | { |
| 3459 | ULONGEST xfered_len; |
| 3460 | enum target_xfer_status status; |
| 3461 | gdb_byte buf[1024]; |
| 3462 | ULONGEST howmuch = std::min<ULONGEST> (sizeof (buf), size - total_xfered); |
| 3463 | |
| 3464 | status = target_xfer_partial (ops, TARGET_OBJECT_MEMORY, NULL, |
| 3465 | buf, NULL, lma + total_xfered, howmuch, |
| 3466 | &xfered_len); |
| 3467 | if (status == TARGET_XFER_OK |
| 3468 | && memcmp (data + total_xfered, buf, xfered_len) == 0) |
| 3469 | { |
| 3470 | total_xfered += xfered_len; |
| 3471 | QUIT; |
| 3472 | } |
| 3473 | else |
| 3474 | return 0; |
| 3475 | } |
| 3476 | return 1; |
| 3477 | } |
| 3478 | |
| 3479 | /* Default implementation of memory verification. */ |
| 3480 | |
| 3481 | static int |
| 3482 | default_verify_memory (struct target_ops *self, |
| 3483 | const gdb_byte *data, CORE_ADDR memaddr, ULONGEST size) |
| 3484 | { |
| 3485 | /* Start over from the top of the target stack. */ |
| 3486 | return simple_verify_memory (current_top_target (), |
| 3487 | data, memaddr, size); |
| 3488 | } |
| 3489 | |
| 3490 | int |
| 3491 | target_verify_memory (const gdb_byte *data, CORE_ADDR memaddr, ULONGEST size) |
| 3492 | { |
| 3493 | return current_top_target ()->verify_memory (data, memaddr, size); |
| 3494 | } |
| 3495 | |
| 3496 | /* The documentation for this function is in its prototype declaration in |
| 3497 | target.h. */ |
| 3498 | |
| 3499 | int |
| 3500 | target_insert_mask_watchpoint (CORE_ADDR addr, CORE_ADDR mask, |
| 3501 | enum target_hw_bp_type rw) |
| 3502 | { |
| 3503 | return current_top_target ()->insert_mask_watchpoint (addr, mask, rw); |
| 3504 | } |
| 3505 | |
| 3506 | /* The documentation for this function is in its prototype declaration in |
| 3507 | target.h. */ |
| 3508 | |
| 3509 | int |
| 3510 | target_remove_mask_watchpoint (CORE_ADDR addr, CORE_ADDR mask, |
| 3511 | enum target_hw_bp_type rw) |
| 3512 | { |
| 3513 | return current_top_target ()->remove_mask_watchpoint (addr, mask, rw); |
| 3514 | } |
| 3515 | |
| 3516 | /* The documentation for this function is in its prototype declaration |
| 3517 | in target.h. */ |
| 3518 | |
| 3519 | int |
| 3520 | target_masked_watch_num_registers (CORE_ADDR addr, CORE_ADDR mask) |
| 3521 | { |
| 3522 | return current_top_target ()->masked_watch_num_registers (addr, mask); |
| 3523 | } |
| 3524 | |
| 3525 | /* The documentation for this function is in its prototype declaration |
| 3526 | in target.h. */ |
| 3527 | |
| 3528 | int |
| 3529 | target_ranged_break_num_registers (void) |
| 3530 | { |
| 3531 | return current_top_target ()->ranged_break_num_registers (); |
| 3532 | } |
| 3533 | |
| 3534 | /* See target.h. */ |
| 3535 | |
| 3536 | struct btrace_target_info * |
| 3537 | target_enable_btrace (ptid_t ptid, const struct btrace_config *conf) |
| 3538 | { |
| 3539 | return current_top_target ()->enable_btrace (ptid, conf); |
| 3540 | } |
| 3541 | |
| 3542 | /* See target.h. */ |
| 3543 | |
| 3544 | void |
| 3545 | target_disable_btrace (struct btrace_target_info *btinfo) |
| 3546 | { |
| 3547 | current_top_target ()->disable_btrace (btinfo); |
| 3548 | } |
| 3549 | |
| 3550 | /* See target.h. */ |
| 3551 | |
| 3552 | void |
| 3553 | target_teardown_btrace (struct btrace_target_info *btinfo) |
| 3554 | { |
| 3555 | current_top_target ()->teardown_btrace (btinfo); |
| 3556 | } |
| 3557 | |
| 3558 | /* See target.h. */ |
| 3559 | |
| 3560 | enum btrace_error |
| 3561 | target_read_btrace (struct btrace_data *btrace, |
| 3562 | struct btrace_target_info *btinfo, |
| 3563 | enum btrace_read_type type) |
| 3564 | { |
| 3565 | return current_top_target ()->read_btrace (btrace, btinfo, type); |
| 3566 | } |
| 3567 | |
| 3568 | /* See target.h. */ |
| 3569 | |
| 3570 | const struct btrace_config * |
| 3571 | target_btrace_conf (const struct btrace_target_info *btinfo) |
| 3572 | { |
| 3573 | return current_top_target ()->btrace_conf (btinfo); |
| 3574 | } |
| 3575 | |
| 3576 | /* See target.h. */ |
| 3577 | |
| 3578 | void |
| 3579 | target_stop_recording (void) |
| 3580 | { |
| 3581 | current_top_target ()->stop_recording (); |
| 3582 | } |
| 3583 | |
| 3584 | /* See target.h. */ |
| 3585 | |
| 3586 | void |
| 3587 | target_save_record (const char *filename) |
| 3588 | { |
| 3589 | current_top_target ()->save_record (filename); |
| 3590 | } |
| 3591 | |
| 3592 | /* See target.h. */ |
| 3593 | |
| 3594 | int |
| 3595 | target_supports_delete_record () |
| 3596 | { |
| 3597 | return current_top_target ()->supports_delete_record (); |
| 3598 | } |
| 3599 | |
| 3600 | /* See target.h. */ |
| 3601 | |
| 3602 | void |
| 3603 | target_delete_record (void) |
| 3604 | { |
| 3605 | current_top_target ()->delete_record (); |
| 3606 | } |
| 3607 | |
| 3608 | /* See target.h. */ |
| 3609 | |
| 3610 | enum record_method |
| 3611 | target_record_method (ptid_t ptid) |
| 3612 | { |
| 3613 | return current_top_target ()->record_method (ptid); |
| 3614 | } |
| 3615 | |
| 3616 | /* See target.h. */ |
| 3617 | |
| 3618 | int |
| 3619 | target_record_is_replaying (ptid_t ptid) |
| 3620 | { |
| 3621 | return current_top_target ()->record_is_replaying (ptid); |
| 3622 | } |
| 3623 | |
| 3624 | /* See target.h. */ |
| 3625 | |
| 3626 | int |
| 3627 | target_record_will_replay (ptid_t ptid, int dir) |
| 3628 | { |
| 3629 | return current_top_target ()->record_will_replay (ptid, dir); |
| 3630 | } |
| 3631 | |
| 3632 | /* See target.h. */ |
| 3633 | |
| 3634 | void |
| 3635 | target_record_stop_replaying (void) |
| 3636 | { |
| 3637 | current_top_target ()->record_stop_replaying (); |
| 3638 | } |
| 3639 | |
| 3640 | /* See target.h. */ |
| 3641 | |
| 3642 | void |
| 3643 | target_goto_record_begin (void) |
| 3644 | { |
| 3645 | current_top_target ()->goto_record_begin (); |
| 3646 | } |
| 3647 | |
| 3648 | /* See target.h. */ |
| 3649 | |
| 3650 | void |
| 3651 | target_goto_record_end (void) |
| 3652 | { |
| 3653 | current_top_target ()->goto_record_end (); |
| 3654 | } |
| 3655 | |
| 3656 | /* See target.h. */ |
| 3657 | |
| 3658 | void |
| 3659 | target_goto_record (ULONGEST insn) |
| 3660 | { |
| 3661 | current_top_target ()->goto_record (insn); |
| 3662 | } |
| 3663 | |
| 3664 | /* See target.h. */ |
| 3665 | |
| 3666 | void |
| 3667 | target_insn_history (int size, gdb_disassembly_flags flags) |
| 3668 | { |
| 3669 | current_top_target ()->insn_history (size, flags); |
| 3670 | } |
| 3671 | |
| 3672 | /* See target.h. */ |
| 3673 | |
| 3674 | void |
| 3675 | target_insn_history_from (ULONGEST from, int size, |
| 3676 | gdb_disassembly_flags flags) |
| 3677 | { |
| 3678 | current_top_target ()->insn_history_from (from, size, flags); |
| 3679 | } |
| 3680 | |
| 3681 | /* See target.h. */ |
| 3682 | |
| 3683 | void |
| 3684 | target_insn_history_range (ULONGEST begin, ULONGEST end, |
| 3685 | gdb_disassembly_flags flags) |
| 3686 | { |
| 3687 | current_top_target ()->insn_history_range (begin, end, flags); |
| 3688 | } |
| 3689 | |
| 3690 | /* See target.h. */ |
| 3691 | |
| 3692 | void |
| 3693 | target_call_history (int size, record_print_flags flags) |
| 3694 | { |
| 3695 | current_top_target ()->call_history (size, flags); |
| 3696 | } |
| 3697 | |
| 3698 | /* See target.h. */ |
| 3699 | |
| 3700 | void |
| 3701 | target_call_history_from (ULONGEST begin, int size, record_print_flags flags) |
| 3702 | { |
| 3703 | current_top_target ()->call_history_from (begin, size, flags); |
| 3704 | } |
| 3705 | |
| 3706 | /* See target.h. */ |
| 3707 | |
| 3708 | void |
| 3709 | target_call_history_range (ULONGEST begin, ULONGEST end, record_print_flags flags) |
| 3710 | { |
| 3711 | current_top_target ()->call_history_range (begin, end, flags); |
| 3712 | } |
| 3713 | |
| 3714 | /* See target.h. */ |
| 3715 | |
| 3716 | const struct frame_unwind * |
| 3717 | target_get_unwinder (void) |
| 3718 | { |
| 3719 | return current_top_target ()->get_unwinder (); |
| 3720 | } |
| 3721 | |
| 3722 | /* See target.h. */ |
| 3723 | |
| 3724 | const struct frame_unwind * |
| 3725 | target_get_tailcall_unwinder (void) |
| 3726 | { |
| 3727 | return current_top_target ()->get_tailcall_unwinder (); |
| 3728 | } |
| 3729 | |
| 3730 | /* See target.h. */ |
| 3731 | |
| 3732 | void |
| 3733 | target_prepare_to_generate_core (void) |
| 3734 | { |
| 3735 | current_top_target ()->prepare_to_generate_core (); |
| 3736 | } |
| 3737 | |
| 3738 | /* See target.h. */ |
| 3739 | |
| 3740 | void |
| 3741 | target_done_generating_core (void) |
| 3742 | { |
| 3743 | current_top_target ()->done_generating_core (); |
| 3744 | } |
| 3745 | |
| 3746 | \f |
| 3747 | |
| 3748 | static char targ_desc[] = |
| 3749 | "Names of targets and files being debugged.\nShows the entire \ |
| 3750 | stack of targets currently in use (including the exec-file,\n\ |
| 3751 | core-file, and process, if any), as well as the symbol file name."; |
| 3752 | |
| 3753 | static void |
| 3754 | default_rcmd (struct target_ops *self, const char *command, |
| 3755 | struct ui_file *output) |
| 3756 | { |
| 3757 | error (_("\"monitor\" command not supported by this target.")); |
| 3758 | } |
| 3759 | |
| 3760 | static void |
| 3761 | do_monitor_command (const char *cmd, int from_tty) |
| 3762 | { |
| 3763 | target_rcmd (cmd, gdb_stdtarg); |
| 3764 | } |
| 3765 | |
| 3766 | /* Erases all the memory regions marked as flash. CMD and FROM_TTY are |
| 3767 | ignored. */ |
| 3768 | |
| 3769 | void |
| 3770 | flash_erase_command (const char *cmd, int from_tty) |
| 3771 | { |
| 3772 | /* Used to communicate termination of flash operations to the target. */ |
| 3773 | bool found_flash_region = false; |
| 3774 | struct gdbarch *gdbarch = target_gdbarch (); |
| 3775 | |
| 3776 | std::vector<mem_region> mem_regions = target_memory_map (); |
| 3777 | |
| 3778 | /* Iterate over all memory regions. */ |
| 3779 | for (const mem_region &m : mem_regions) |
| 3780 | { |
| 3781 | /* Is this a flash memory region? */ |
| 3782 | if (m.attrib.mode == MEM_FLASH) |
| 3783 | { |
| 3784 | found_flash_region = true; |
| 3785 | target_flash_erase (m.lo, m.hi - m.lo); |
| 3786 | |
| 3787 | ui_out_emit_tuple tuple_emitter (current_uiout, "erased-regions"); |
| 3788 | |
| 3789 | current_uiout->message (_("Erasing flash memory region at address ")); |
| 3790 | current_uiout->field_core_addr ("address", gdbarch, m.lo); |
| 3791 | current_uiout->message (", size = "); |
| 3792 | current_uiout->field_string ("size", hex_string (m.hi - m.lo)); |
| 3793 | current_uiout->message ("\n"); |
| 3794 | } |
| 3795 | } |
| 3796 | |
| 3797 | /* Did we do any flash operations? If so, we need to finalize them. */ |
| 3798 | if (found_flash_region) |
| 3799 | target_flash_done (); |
| 3800 | else |
| 3801 | current_uiout->message (_("No flash memory regions found.\n")); |
| 3802 | } |
| 3803 | |
| 3804 | /* Print the name of each layers of our target stack. */ |
| 3805 | |
| 3806 | static void |
| 3807 | maintenance_print_target_stack (const char *cmd, int from_tty) |
| 3808 | { |
| 3809 | printf_filtered (_("The current target stack is:\n")); |
| 3810 | |
| 3811 | for (target_ops *t = current_top_target (); t != NULL; t = t->beneath ()) |
| 3812 | { |
| 3813 | if (t->stratum () == debug_stratum) |
| 3814 | continue; |
| 3815 | printf_filtered (" - %s (%s)\n", t->shortname (), t->longname ()); |
| 3816 | } |
| 3817 | } |
| 3818 | |
| 3819 | /* See target.h. */ |
| 3820 | |
| 3821 | void |
| 3822 | target_async (int enable) |
| 3823 | { |
| 3824 | infrun_async (enable); |
| 3825 | current_top_target ()->async (enable); |
| 3826 | } |
| 3827 | |
| 3828 | /* See target.h. */ |
| 3829 | |
| 3830 | void |
| 3831 | target_thread_events (int enable) |
| 3832 | { |
| 3833 | current_top_target ()->thread_events (enable); |
| 3834 | } |
| 3835 | |
| 3836 | /* Controls if targets can report that they can/are async. This is |
| 3837 | just for maintainers to use when debugging gdb. */ |
| 3838 | bool target_async_permitted = true; |
| 3839 | |
| 3840 | /* The set command writes to this variable. If the inferior is |
| 3841 | executing, target_async_permitted is *not* updated. */ |
| 3842 | static bool target_async_permitted_1 = true; |
| 3843 | |
| 3844 | static void |
| 3845 | maint_set_target_async_command (const char *args, int from_tty, |
| 3846 | struct cmd_list_element *c) |
| 3847 | { |
| 3848 | if (have_live_inferiors ()) |
| 3849 | { |
| 3850 | target_async_permitted_1 = target_async_permitted; |
| 3851 | error (_("Cannot change this setting while the inferior is running.")); |
| 3852 | } |
| 3853 | |
| 3854 | target_async_permitted = target_async_permitted_1; |
| 3855 | } |
| 3856 | |
| 3857 | static void |
| 3858 | maint_show_target_async_command (struct ui_file *file, int from_tty, |
| 3859 | struct cmd_list_element *c, |
| 3860 | const char *value) |
| 3861 | { |
| 3862 | fprintf_filtered (file, |
| 3863 | _("Controlling the inferior in " |
| 3864 | "asynchronous mode is %s.\n"), value); |
| 3865 | } |
| 3866 | |
| 3867 | /* Return true if the target operates in non-stop mode even with "set |
| 3868 | non-stop off". */ |
| 3869 | |
| 3870 | static int |
| 3871 | target_always_non_stop_p (void) |
| 3872 | { |
| 3873 | return current_top_target ()->always_non_stop_p (); |
| 3874 | } |
| 3875 | |
| 3876 | /* See target.h. */ |
| 3877 | |
| 3878 | int |
| 3879 | target_is_non_stop_p (void) |
| 3880 | { |
| 3881 | return (non_stop |
| 3882 | || target_non_stop_enabled == AUTO_BOOLEAN_TRUE |
| 3883 | || (target_non_stop_enabled == AUTO_BOOLEAN_AUTO |
| 3884 | && target_always_non_stop_p ())); |
| 3885 | } |
| 3886 | |
| 3887 | /* Controls if targets can report that they always run in non-stop |
| 3888 | mode. This is just for maintainers to use when debugging gdb. */ |
| 3889 | enum auto_boolean target_non_stop_enabled = AUTO_BOOLEAN_AUTO; |
| 3890 | |
| 3891 | /* The set command writes to this variable. If the inferior is |
| 3892 | executing, target_non_stop_enabled is *not* updated. */ |
| 3893 | static enum auto_boolean target_non_stop_enabled_1 = AUTO_BOOLEAN_AUTO; |
| 3894 | |
| 3895 | /* Implementation of "maint set target-non-stop". */ |
| 3896 | |
| 3897 | static void |
| 3898 | maint_set_target_non_stop_command (const char *args, int from_tty, |
| 3899 | struct cmd_list_element *c) |
| 3900 | { |
| 3901 | if (have_live_inferiors ()) |
| 3902 | { |
| 3903 | target_non_stop_enabled_1 = target_non_stop_enabled; |
| 3904 | error (_("Cannot change this setting while the inferior is running.")); |
| 3905 | } |
| 3906 | |
| 3907 | target_non_stop_enabled = target_non_stop_enabled_1; |
| 3908 | } |
| 3909 | |
| 3910 | /* Implementation of "maint show target-non-stop". */ |
| 3911 | |
| 3912 | static void |
| 3913 | maint_show_target_non_stop_command (struct ui_file *file, int from_tty, |
| 3914 | struct cmd_list_element *c, |
| 3915 | const char *value) |
| 3916 | { |
| 3917 | if (target_non_stop_enabled == AUTO_BOOLEAN_AUTO) |
| 3918 | fprintf_filtered (file, |
| 3919 | _("Whether the target is always in non-stop mode " |
| 3920 | "is %s (currently %s).\n"), value, |
| 3921 | target_always_non_stop_p () ? "on" : "off"); |
| 3922 | else |
| 3923 | fprintf_filtered (file, |
| 3924 | _("Whether the target is always in non-stop mode " |
| 3925 | "is %s.\n"), value); |
| 3926 | } |
| 3927 | |
| 3928 | /* Temporary copies of permission settings. */ |
| 3929 | |
| 3930 | static bool may_write_registers_1 = true; |
| 3931 | static bool may_write_memory_1 = true; |
| 3932 | static bool may_insert_breakpoints_1 = true; |
| 3933 | static bool may_insert_tracepoints_1 = true; |
| 3934 | static bool may_insert_fast_tracepoints_1 = true; |
| 3935 | static bool may_stop_1 = true; |
| 3936 | |
| 3937 | /* Make the user-set values match the real values again. */ |
| 3938 | |
| 3939 | void |
| 3940 | update_target_permissions (void) |
| 3941 | { |
| 3942 | may_write_registers_1 = may_write_registers; |
| 3943 | may_write_memory_1 = may_write_memory; |
| 3944 | may_insert_breakpoints_1 = may_insert_breakpoints; |
| 3945 | may_insert_tracepoints_1 = may_insert_tracepoints; |
| 3946 | may_insert_fast_tracepoints_1 = may_insert_fast_tracepoints; |
| 3947 | may_stop_1 = may_stop; |
| 3948 | } |
| 3949 | |
| 3950 | /* The one function handles (most of) the permission flags in the same |
| 3951 | way. */ |
| 3952 | |
| 3953 | static void |
| 3954 | set_target_permissions (const char *args, int from_tty, |
| 3955 | struct cmd_list_element *c) |
| 3956 | { |
| 3957 | if (target_has_execution) |
| 3958 | { |
| 3959 | update_target_permissions (); |
| 3960 | error (_("Cannot change this setting while the inferior is running.")); |
| 3961 | } |
| 3962 | |
| 3963 | /* Make the real values match the user-changed values. */ |
| 3964 | may_write_registers = may_write_registers_1; |
| 3965 | may_insert_breakpoints = may_insert_breakpoints_1; |
| 3966 | may_insert_tracepoints = may_insert_tracepoints_1; |
| 3967 | may_insert_fast_tracepoints = may_insert_fast_tracepoints_1; |
| 3968 | may_stop = may_stop_1; |
| 3969 | update_observer_mode (); |
| 3970 | } |
| 3971 | |
| 3972 | /* Set memory write permission independently of observer mode. */ |
| 3973 | |
| 3974 | static void |
| 3975 | set_write_memory_permission (const char *args, int from_tty, |
| 3976 | struct cmd_list_element *c) |
| 3977 | { |
| 3978 | /* Make the real values match the user-changed values. */ |
| 3979 | may_write_memory = may_write_memory_1; |
| 3980 | update_observer_mode (); |
| 3981 | } |
| 3982 | |
| 3983 | void |
| 3984 | initialize_targets (void) |
| 3985 | { |
| 3986 | push_target (&the_dummy_target); |
| 3987 | |
| 3988 | the_debug_target = new debug_target (); |
| 3989 | |
| 3990 | add_info ("target", info_target_command, targ_desc); |
| 3991 | add_info ("files", info_target_command, targ_desc); |
| 3992 | |
| 3993 | add_setshow_zuinteger_cmd ("target", class_maintenance, &targetdebug, _("\ |
| 3994 | Set target debugging."), _("\ |
| 3995 | Show target debugging."), _("\ |
| 3996 | When non-zero, target debugging is enabled. Higher numbers are more\n\ |
| 3997 | verbose."), |
| 3998 | set_targetdebug, |
| 3999 | show_targetdebug, |
| 4000 | &setdebuglist, &showdebuglist); |
| 4001 | |
| 4002 | add_setshow_boolean_cmd ("trust-readonly-sections", class_support, |
| 4003 | &trust_readonly, _("\ |
| 4004 | Set mode for reading from readonly sections."), _("\ |
| 4005 | Show mode for reading from readonly sections."), _("\ |
| 4006 | When this mode is on, memory reads from readonly sections (such as .text)\n\ |
| 4007 | will be read from the object file instead of from the target. This will\n\ |
| 4008 | result in significant performance improvement for remote targets."), |
| 4009 | NULL, |
| 4010 | show_trust_readonly, |
| 4011 | &setlist, &showlist); |
| 4012 | |
| 4013 | add_com ("monitor", class_obscure, do_monitor_command, |
| 4014 | _("Send a command to the remote monitor (remote targets only).")); |
| 4015 | |
| 4016 | add_cmd ("target-stack", class_maintenance, maintenance_print_target_stack, |
| 4017 | _("Print the name of each layer of the internal target stack."), |
| 4018 | &maintenanceprintlist); |
| 4019 | |
| 4020 | add_setshow_boolean_cmd ("target-async", no_class, |
| 4021 | &target_async_permitted_1, _("\ |
| 4022 | Set whether gdb controls the inferior in asynchronous mode."), _("\ |
| 4023 | Show whether gdb controls the inferior in asynchronous mode."), _("\ |
| 4024 | Tells gdb whether to control the inferior in asynchronous mode."), |
| 4025 | maint_set_target_async_command, |
| 4026 | maint_show_target_async_command, |
| 4027 | &maintenance_set_cmdlist, |
| 4028 | &maintenance_show_cmdlist); |
| 4029 | |
| 4030 | add_setshow_auto_boolean_cmd ("target-non-stop", no_class, |
| 4031 | &target_non_stop_enabled_1, _("\ |
| 4032 | Set whether gdb always controls the inferior in non-stop mode."), _("\ |
| 4033 | Show whether gdb always controls the inferior in non-stop mode."), _("\ |
| 4034 | Tells gdb whether to control the inferior in non-stop mode."), |
| 4035 | maint_set_target_non_stop_command, |
| 4036 | maint_show_target_non_stop_command, |
| 4037 | &maintenance_set_cmdlist, |
| 4038 | &maintenance_show_cmdlist); |
| 4039 | |
| 4040 | add_setshow_boolean_cmd ("may-write-registers", class_support, |
| 4041 | &may_write_registers_1, _("\ |
| 4042 | Set permission to write into registers."), _("\ |
| 4043 | Show permission to write into registers."), _("\ |
| 4044 | When this permission is on, GDB may write into the target's registers.\n\ |
| 4045 | Otherwise, any sort of write attempt will result in an error."), |
| 4046 | set_target_permissions, NULL, |
| 4047 | &setlist, &showlist); |
| 4048 | |
| 4049 | add_setshow_boolean_cmd ("may-write-memory", class_support, |
| 4050 | &may_write_memory_1, _("\ |
| 4051 | Set permission to write into target memory."), _("\ |
| 4052 | Show permission to write into target memory."), _("\ |
| 4053 | When this permission is on, GDB may write into the target's memory.\n\ |
| 4054 | Otherwise, any sort of write attempt will result in an error."), |
| 4055 | set_write_memory_permission, NULL, |
| 4056 | &setlist, &showlist); |
| 4057 | |
| 4058 | add_setshow_boolean_cmd ("may-insert-breakpoints", class_support, |
| 4059 | &may_insert_breakpoints_1, _("\ |
| 4060 | Set permission to insert breakpoints in the target."), _("\ |
| 4061 | Show permission to insert breakpoints in the target."), _("\ |
| 4062 | When this permission is on, GDB may insert breakpoints in the program.\n\ |
| 4063 | Otherwise, any sort of insertion attempt will result in an error."), |
| 4064 | set_target_permissions, NULL, |
| 4065 | &setlist, &showlist); |
| 4066 | |
| 4067 | add_setshow_boolean_cmd ("may-insert-tracepoints", class_support, |
| 4068 | &may_insert_tracepoints_1, _("\ |
| 4069 | Set permission to insert tracepoints in the target."), _("\ |
| 4070 | Show permission to insert tracepoints in the target."), _("\ |
| 4071 | When this permission is on, GDB may insert tracepoints in the program.\n\ |
| 4072 | Otherwise, any sort of insertion attempt will result in an error."), |
| 4073 | set_target_permissions, NULL, |
| 4074 | &setlist, &showlist); |
| 4075 | |
| 4076 | add_setshow_boolean_cmd ("may-insert-fast-tracepoints", class_support, |
| 4077 | &may_insert_fast_tracepoints_1, _("\ |
| 4078 | Set permission to insert fast tracepoints in the target."), _("\ |
| 4079 | Show permission to insert fast tracepoints in the target."), _("\ |
| 4080 | When this permission is on, GDB may insert fast tracepoints.\n\ |
| 4081 | Otherwise, any sort of insertion attempt will result in an error."), |
| 4082 | set_target_permissions, NULL, |
| 4083 | &setlist, &showlist); |
| 4084 | |
| 4085 | add_setshow_boolean_cmd ("may-interrupt", class_support, |
| 4086 | &may_stop_1, _("\ |
| 4087 | Set permission to interrupt or signal the target."), _("\ |
| 4088 | Show permission to interrupt or signal the target."), _("\ |
| 4089 | When this permission is on, GDB may interrupt/stop the target's execution.\n\ |
| 4090 | Otherwise, any attempt to interrupt or stop will be ignored."), |
| 4091 | set_target_permissions, NULL, |
| 4092 | &setlist, &showlist); |
| 4093 | |
| 4094 | add_com ("flash-erase", no_class, flash_erase_command, |
| 4095 | _("Erase all flash memory regions.")); |
| 4096 | |
| 4097 | add_setshow_boolean_cmd ("auto-connect-native-target", class_support, |
| 4098 | &auto_connect_native_target, _("\ |
| 4099 | Set whether GDB may automatically connect to the native target."), _("\ |
| 4100 | Show whether GDB may automatically connect to the native target."), _("\ |
| 4101 | When on, and GDB is not connected to a target yet, GDB\n\ |
| 4102 | attempts \"run\" and other commands with the native target."), |
| 4103 | NULL, show_auto_connect_native_target, |
| 4104 | &setlist, &showlist); |
| 4105 | } |