gdb/inferior.h

   1 /* Variables that describe the inferior process running under GDB:
   2    Where it is, why it stopped, and how to step it.
   3
   4    Copyright (C) 1986-2013 Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #if !defined (INFERIOR_H)
  22 #define INFERIOR_H 1
  23
  24 struct target_waitstatus;
  25 struct frame_info;
  26 struct ui_file;
  27 struct type;
  28 struct gdbarch;
  29 struct regcache;
  30 struct ui_out;
  31 struct terminal_info;
  32 struct target_desc_info;
  33
  34 #include "ptid.h"
  35
  36 /* For bpstat.  */
  37 #include "breakpoint.h"
  38
  39 /* For enum gdb_signal.  */
  40 #include "target.h"
  41
  42 /* For struct frame_id.  */
  43 #include "frame.h"
  44
  45 #include "progspace.h"
  46 #include "registry.h"
  47
  48 struct infcall_suspend_state;
  49 struct infcall_control_state;
  50
  51 extern struct infcall_suspend_state *save_infcall_suspend_state (void);
  52 extern struct infcall_control_state *save_infcall_control_state (void);
  53
  54 extern void restore_infcall_suspend_state (struct infcall_suspend_state *);
  55 extern void restore_infcall_control_state (struct infcall_control_state *);
  56
  57 extern struct cleanup *make_cleanup_restore_infcall_suspend_state
  58                                             (struct infcall_suspend_state *);
  59 extern struct cleanup *make_cleanup_restore_infcall_control_state
  60                                             (struct infcall_control_state *);
  61
  62 extern void discard_infcall_suspend_state (struct infcall_suspend_state *);
  63 extern void discard_infcall_control_state (struct infcall_control_state *);
  64
  65 extern struct regcache *
  66   get_infcall_suspend_state_regcache (struct infcall_suspend_state *);
  67
  68 /* Returns true if PTID matches filter FILTER.  FILTER can be the wild
  69    card MINUS_ONE_PTID (all ptid match it); can be a ptid representing
  70    a process (ptid_is_pid returns true), in which case, all lwps and
  71    threads of that given process match, lwps and threads of other
  72    processes do not; or, it can represent a specific thread, in which
  73    case, only that thread will match true.  PTID must represent a
  74    specific LWP or THREAD, it can never be a wild card.  */
  75
  76 extern int ptid_match (ptid_t ptid, ptid_t filter);
  77
  78 /* Save value of inferior_ptid so that it may be restored by
  79    a later call to do_cleanups().  Returns the struct cleanup
  80    pointer needed for later doing the cleanup.  */
  81 extern struct cleanup * save_inferior_ptid (void);
  82
  83 extern void set_sigint_trap (void);
  84
  85 extern void clear_sigint_trap (void);
  86
  87 /* Set/get file name for default use for standard in/out in the inferior.  */
  88
  89 extern void set_inferior_io_terminal (const char *terminal_name);
  90 extern const char *get_inferior_io_terminal (void);
  91
  92 /* Collected pid, tid, etc. of the debugged inferior.  When there's
  93    no inferior, PIDGET (inferior_ptid) will be 0.  */
  94
  95 extern ptid_t inferior_ptid;
  96
  97 /* Are we simulating synchronous execution? This is used in async gdb
  98    to implement the 'run', 'continue' etc commands, which will not
  99    redisplay the prompt until the execution is actually over.  */
 100 extern int sync_execution;
 101
 102 /* Inferior environment.  */
 103
 104 extern void clear_proceed_status (void);
 105
 106 extern void proceed (CORE_ADDR, enum gdb_signal, int);
 107
 108 extern int sched_multi;
 109
 110 /* When set, stop the 'step' command if we enter a function which has
 111    no line number information.  The normal behavior is that we step
 112    over such function.  */
 113 extern int step_stop_if_no_debug;
 114
 115 /* If set, the inferior should be controlled in non-stop mode.  In
 116    this mode, each thread is controlled independently.  Execution
 117    commands apply only to the selected thread by default, and stop
 118    events stop only the thread that had the event -- the other threads
 119    are kept running freely.  */
 120 extern int non_stop;
 121
 122 /* When set (default), the target should attempt to disable the operating
 123    system's address space randomization feature when starting an inferior.  */
 124 extern int disable_randomization;
 125
 126 extern void generic_mourn_inferior (void);
 127
 128 extern void terminal_save_ours (void);
 129
 130 extern void terminal_ours (void);
 131
 132 extern CORE_ADDR unsigned_pointer_to_address (struct gdbarch *gdbarch,
 133                                               struct type *type,
 134                                               const gdb_byte *buf);
 135 extern void unsigned_address_to_pointer (struct gdbarch *gdbarch,
 136                                          struct type *type, gdb_byte *buf,
 137                                          CORE_ADDR addr);
 138 extern CORE_ADDR signed_pointer_to_address (struct gdbarch *gdbarch,
 139                                             struct type *type,
 140                                             const gdb_byte *buf);
 141 extern void address_to_signed_pointer (struct gdbarch *gdbarch,
 142                                        struct type *type, gdb_byte *buf,
 143                                        CORE_ADDR addr);
 144
 145 extern void wait_for_inferior (void);
 146
 147 extern void prepare_for_detach (void);
 148
 149 extern void fetch_inferior_event (void *);
 150
 151 extern void init_wait_for_inferior (void);
 152
 153 extern void reopen_exec_file (void);
 154
 155 /* The `resume' routine should only be called in special circumstances.
 156    Normally, use `proceed', which handles a lot of bookkeeping.  */
 157
 158 extern void resume (int, enum gdb_signal);
 159
 160 extern ptid_t user_visible_resume_ptid (int step);
 161
 162 extern void insert_step_resume_breakpoint_at_sal (struct gdbarch *,
 163                                                   struct symtab_and_line ,
 164                                                   struct frame_id);
 165
 166 /* From misc files */
 167
 168 extern void default_print_registers_info (struct gdbarch *gdbarch,
 169                                           struct ui_file *file,
 170                                           struct frame_info *frame,
 171                                           int regnum, int all);
 172
 173 extern void child_terminal_info (const char *, int);
 174
 175 extern void term_info (char *, int);
 176
 177 extern void terminal_ours_for_output (void);
 178
 179 extern void terminal_inferior (void);
 180
 181 extern void terminal_init_inferior (void);
 182
 183 extern void terminal_init_inferior_with_pgrp (int pgrp);
 184
 185 /* From fork-child.c */
 186
 187 extern int fork_inferior (char *, char *, char **,
 188                           void (*)(void),
 189                           void (*)(int), void (*)(void), char *,
 190                           void (*)(const char *,
 191                                    char * const *, char * const *));
 192
 193
 194 extern void startup_inferior (int);
 195
 196 extern char *construct_inferior_arguments (int, char **);
 197
 198 /* From infrun.c */
 199
 200 extern unsigned int debug_infrun;
 201
 202 extern int stop_on_solib_events;
 203
 204 extern void start_remote (int from_tty);
 205
 206 extern void normal_stop (void);
 207
 208 extern int signal_stop_state (int);
 209
 210 extern int signal_print_state (int);
 211
 212 extern int signal_pass_state (int);
 213
 214 extern int signal_stop_update (int, int);
 215
 216 extern int signal_print_update (int, int);
 217
 218 extern int signal_pass_update (int, int);
 219
 220 extern void get_last_target_status(ptid_t *ptid,
 221                                    struct target_waitstatus *status);
 222
 223 extern void follow_inferior_reset_breakpoints (void);
 224
 225 void set_step_info (struct frame_info *frame, struct symtab_and_line sal);
 226
 227 /* From infcmd.c */
 228
 229 extern void post_create_inferior (struct target_ops *, int);
 230
 231 extern void attach_command (char *, int);
 232
 233 extern char *get_inferior_args (void);
 234
 235 extern void set_inferior_args (char *);
 236
 237 extern void set_inferior_args_vector (int, char **);
 238
 239 extern void registers_info (char *, int);
 240
 241 extern void continue_1 (int all_threads);
 242
 243 extern void interrupt_target_1 (int all_threads);
 244
 245 extern void delete_longjmp_breakpoint_cleanup (void *arg);
 246
 247 extern void detach_command (char *, int);
 248
 249 extern void notice_new_inferior (ptid_t, int, int);
 250
 251 extern struct value *get_return_value (struct value *function,
 252                                        struct type *value_type);
 253
 254 /* Address at which inferior stopped.  */
 255
 256 extern CORE_ADDR stop_pc;
 257
 258 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 259
 260 extern enum stop_stack_kind stop_stack_dummy;
 261
 262 /* Nonzero if program stopped due to a random (unexpected) signal in
 263    inferior process.  */
 264
 265 extern int stopped_by_random_signal;
 266
 267 /* STEP_OVER_ALL means step over all subroutine calls.
 268    STEP_OVER_UNDEBUGGABLE means step over calls to undebuggable functions.
 269    STEP_OVER_NONE means don't step over any subroutine calls.  */
 270
 271 enum step_over_calls_kind
 272   {
 273     STEP_OVER_NONE,
 274     STEP_OVER_ALL,
 275     STEP_OVER_UNDEBUGGABLE
 276   };
 277
 278 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
 279    will handle it themselves.  STOP_QUIETLY is used when running in
 280    the shell before the child program has been exec'd and when running
 281    through shared library loading.  STOP_QUIETLY_REMOTE is used when
 282    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
 283    except that there is no need to hide a signal.  */
 284
 285 /* It is also used after attach, due to attaching to a process.  This
 286    is a bit trickier.  When doing an attach, the kernel stops the
 287    debuggee with a SIGSTOP.  On newer GNU/Linux kernels (>= 2.5.61)
 288    the handling of SIGSTOP for a ptraced process has changed.  Earlier
 289    versions of the kernel would ignore these SIGSTOPs, while now
 290    SIGSTOP is treated like any other signal, i.e. it is not muffled.
 291
 292    If the gdb user does a 'continue' after the 'attach', gdb passes
 293    the global variable stop_signal (which stores the signal from the
 294    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
 295    problematic, because the kernel doesn't ignore such SIGSTOP
 296    now.  I.e. it is reported back to gdb, which in turn presents it
 297    back to the user.
 298
 299    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
 300    gdb to clear the value of stop_signal after the attach, so that it
 301    is not passed back down to the kernel.  */
 302
 303 enum stop_kind
 304   {
 305     NO_STOP_QUIETLY = 0,
 306     STOP_QUIETLY,
 307     STOP_QUIETLY_REMOTE,
 308     STOP_QUIETLY_NO_SIGSTOP
 309   };
 310
 311 /* Reverse execution.  */
 312 enum exec_direction_kind
 313   {
 314     EXEC_FORWARD,
 315     EXEC_REVERSE
 316   };
 317
 318 /* The current execution direction.  This should only be set to enum
 319    exec_direction_kind values.  It is only an int to make it
 320    compatible with make_cleanup_restore_integer.  */
 321 extern int execution_direction;
 322
 323 /* Save register contents here when executing a "finish" command or are
 324    about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set.
 325    Thus this contains the return value from the called function (assuming
 326    values are returned in a register).  */
 327
 328 extern struct regcache *stop_registers;
 329
 330 /* True if we are debugging displaced stepping.  */
 331 extern int debug_displaced;
 332
 333 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline.  */
 334 void displaced_step_dump_bytes (struct ui_file *file,
 335                                 const gdb_byte *buf, size_t len);
 336
 337 struct displaced_step_closure *get_displaced_step_closure_by_addr (CORE_ADDR addr);
 338 \f
 339 /* Possible values for gdbarch_call_dummy_location.  */
 340 #define ON_STACK 1
 341 #define AT_ENTRY_POINT 4
 342
 343 /* If STARTUP_WITH_SHELL is set, GDB's "run"
 344    will attempts to start up the debugee under a shell.
 345    This is in order for argument-expansion to occur.  E.g.,
 346    (gdb) run *
 347    The "*" gets expanded by the shell into a list of files.
 348    While this is a nice feature, it turns out to interact badly
 349    with some of the catch-fork/catch-exec features we have added.
 350    In particular, if the shell does any fork/exec's before
 351    the exec of the target program, that can confuse GDB.
 352    To disable this feature, set STARTUP_WITH_SHELL to 0.
 353    To enable this feature, set STARTUP_WITH_SHELL to 1.
 354    The catch-exec traps expected during start-up will
 355    be 1 if target is not started up with a shell, 2 if it is.
 356    - RT
 357    If you disable this, you need to decrement
 358    START_INFERIOR_TRAPS_EXPECTED in tm.h.  */
 359 #define STARTUP_WITH_SHELL 1
 360 #if !defined(START_INFERIOR_TRAPS_EXPECTED)
 361 #define START_INFERIOR_TRAPS_EXPECTED   2
 362 #endif
 363
 364 struct private_inferior;
 365
 366 /* Inferior process specific part of `struct infcall_control_state'.
 367
 368    Inferior thread counterpart is `struct thread_control_state'.  */
 369
 370 struct inferior_control_state
 371 {
 372   /* See the definition of stop_kind above.  */
 373   enum stop_kind stop_soon;
 374 };
 375
 376 /* Inferior process specific part of `struct infcall_suspend_state'.
 377
 378    Inferior thread counterpart is `struct thread_suspend_state'.  */
 379
 380 #if 0 /* Currently unused and empty structures are not valid C.  */
 381 struct inferior_suspend_state
 382 {
 383 };
 384 #endif
 385
 386 /* GDB represents the state of each program execution with an object
 387    called an inferior.  An inferior typically corresponds to a process
 388    but is more general and applies also to targets that do not have a
 389    notion of processes.  Each run of an executable creates a new
 390    inferior, as does each attachment to an existing process.
 391    Inferiors have unique internal identifiers that are different from
 392    target process ids.  Each inferior may in turn have multiple
 393    threads running in it.  */
 394
 395 struct inferior
 396 {
 397   /* Pointer to next inferior in singly-linked list of inferiors.  */
 398   struct inferior *next;
 399
 400   /* Convenient handle (GDB inferior id).  Unique across all
 401      inferiors.  */
 402   int num;
 403
 404   /* Actual target inferior id, usually, a process id.  This matches
 405      the ptid_t.pid member of threads of this inferior.  */
 406   int pid;
 407   /* True if the PID was actually faked by GDB.  */
 408   int fake_pid_p;
 409
 410   /* State of GDB control of inferior process execution.
 411      See `struct inferior_control_state'.  */
 412   struct inferior_control_state control;
 413
 414   /* State of inferior process to restore after GDB is done with an inferior
 415      call.  See `struct inferior_suspend_state'.  */
 416 #if 0 /* Currently unused and empty structures are not valid C.  */
 417   struct inferior_suspend_state suspend;
 418 #endif
 419
 420   /* True if this was an auto-created inferior, e.g. created from
 421      following a fork; false, if this inferior was manually added by
 422      the user, and we should not attempt to prune it
 423      automatically.  */
 424   int removable;
 425
 426   /* The address space bound to this inferior.  */
 427   struct address_space *aspace;
 428
 429   /* The program space bound to this inferior.  */
 430   struct program_space *pspace;
 431
 432   /* The arguments string to use when running.  */
 433   char *args;
 434
 435   /* The size of elements in argv.  */
 436   int argc;
 437
 438   /* The vector version of arguments.  If ARGC is nonzero,
 439      then we must compute ARGS from this (via the target).
 440      This is always coming from main's argv and therefore
 441      should never be freed.  */
 442   char **argv;
 443
 444   /* The name of terminal device to use for I/O.  */
 445   char *terminal;
 446
 447   /* Environment to use for running inferior,
 448      in format described in environ.h.  */
 449   struct gdb_environ *environment;
 450
 451   /* Nonzero if this child process was attached rather than
 452      forked.  */
 453   int attach_flag;
 454
 455   /* If this inferior is a vfork child, then this is the pointer to
 456      its vfork parent, if GDB is still attached to it.  */
 457   struct inferior *vfork_parent;
 458
 459   /* If this process is a vfork parent, this is the pointer to the
 460      child.  Since a vfork parent is left frozen by the kernel until
 461      the child execs or exits, a process can only have one vfork child
 462      at a given time.  */
 463   struct inferior *vfork_child;
 464
 465   /* True if this inferior should be detached when it's vfork sibling
 466      exits or execs.  */
 467   int pending_detach;
 468
 469   /* True if this inferior is a vfork parent waiting for a vfork child
 470      not under our control to be done with the shared memory region,
 471      either by exiting or execing.  */
 472   int waiting_for_vfork_done;
 473
 474   /* True if we're in the process of detaching from this inferior.  */
 475   int detaching;
 476
 477   /* What is left to do for an execution command after any thread of
 478      this inferior stops.  For continuations associated with a
 479      specific thread, see `struct thread_info'.  */
 480   struct continuation *continuations;
 481
 482   /* Private data used by the target vector implementation.  */
 483   struct private_inferior *private;
 484
 485   /* HAS_EXIT_CODE is true if the inferior exited with an exit code.
 486      In this case, the EXIT_CODE field is also valid.  */
 487   int has_exit_code;
 488   LONGEST exit_code;
 489
 490   /* Default flags to pass to the symbol reading functions.  These are
 491      used whenever a new objfile is created.  The valid values come
 492      from enum symfile_add_flags.  */
 493   int symfile_flags;
 494
 495   /* Info about an inferior's target description (if it's fetched; the
 496      user supplied description's filename, if any; etc.).  */
 497   struct target_desc_info *tdesc_info;
 498
 499   /* The architecture associated with the inferior through the
 500      connection to the target.
 501
 502      The architecture vector provides some information that is really
 503      a property of the inferior, accessed through a particular target:
 504      ptrace operations; the layout of certain RSP packets; the
 505      solib_ops vector; etc.  To differentiate architecture accesses to
 506      per-inferior/target properties from
 507      per-thread/per-frame/per-objfile properties, accesses to
 508      per-inferior/target properties should be made through
 509      this gdbarch.  */
 510   struct gdbarch *gdbarch;
 511
 512   /* Per inferior data-pointers required by other GDB modules.  */
 513   REGISTRY_FIELDS;
 514 };
 515
 516 /* Keep a registry of per-inferior data-pointers required by other GDB
 517    modules.  */
 518
 519 DECLARE_REGISTRY (inferior);
 520
 521 /* Create an empty inferior list, or empty the existing one.  */
 522 extern void init_inferior_list (void);
 523
 524 /* Add an inferior to the inferior list, print a message that a new
 525    inferior is found, and return the pointer to the new inferior.
 526    Caller may use this pointer to initialize the private inferior
 527    data.  */
 528 extern struct inferior *add_inferior (int pid);
 529
 530 /* Same as add_inferior, but don't print new inferior notifications to
 531    the CLI.  */
 532 extern struct inferior *add_inferior_silent (int pid);
 533
 534 /* Delete an existing inferior list entry, due to inferior exit.  */
 535 extern void delete_inferior (int pid);
 536
 537 extern void delete_inferior_1 (struct inferior *todel, int silent);
 538
 539 /* Same as delete_inferior, but don't print new inferior notifications
 540    to the CLI.  */
 541 extern void delete_inferior_silent (int pid);
 542
 543 /* Delete an existing inferior list entry, due to inferior detaching.  */
 544 extern void detach_inferior (int pid);
 545
 546 extern void exit_inferior (int pid);
 547
 548 extern void exit_inferior_silent (int pid);
 549
 550 extern void exit_inferior_num_silent (int num);
 551
 552 extern void inferior_appeared (struct inferior *inf, int pid);
 553
 554 /* Get rid of all inferiors.  */
 555 extern void discard_all_inferiors (void);
 556
 557 /* Translate the integer inferior id (GDB's homegrown id, not the system's)
 558    into a "pid" (which may be overloaded with extra inferior information).  */
 559 extern int gdb_inferior_id_to_pid (int);
 560
 561 /* Translate a target 'pid' into the integer inferior id (GDB's
 562    homegrown id, not the system's).  */
 563 extern int pid_to_gdb_inferior_id (int pid);
 564
 565 /* Boolean test for an already-known pid.  */
 566 extern int in_inferior_list (int pid);
 567
 568 /* Boolean test for an already-known inferior id (GDB's homegrown id,
 569    not the system's).  */
 570 extern int valid_gdb_inferior_id (int num);
 571
 572 /* Search function to lookup an inferior by target 'pid'.  */
 573 extern struct inferior *find_inferior_pid (int pid);
 574
 575 /* Search function to lookup an inferior by GDB 'num'.  */
 576 extern struct inferior *find_inferior_id (int num);
 577
 578 /* Find an inferior bound to PSPACE.  */
 579 extern struct inferior *
 580   find_inferior_for_program_space (struct program_space *pspace);
 581
 582 /* Inferior iterator function.
 583
 584    Calls a callback function once for each inferior, so long as the
 585    callback function returns false.  If the callback function returns
 586    true, the iteration will end and the current inferior will be
 587    returned.  This can be useful for implementing a search for a
 588    inferior with arbitrary attributes, or for applying some operation
 589    to every inferior.
 590
 591    It is safe to delete the iterated inferior from the callback.  */
 592 extern struct inferior *iterate_over_inferiors (int (*) (struct inferior *,
 593                                                          void *),
 594                                                 void *);
 595
 596 /* Returns true if the inferior list is not empty.  */
 597 extern int have_inferiors (void);
 598
 599 /* Returns true if there are any live inferiors in the inferior list
 600    (not cores, not executables, real live processes).  */
 601 extern int have_live_inferiors (void);
 602
 603 /* Return a pointer to the current inferior.  It is an error to call
 604    this if there is no current inferior.  */
 605 extern struct inferior *current_inferior (void);
 606
 607 extern void set_current_inferior (struct inferior *);
 608
 609 extern struct cleanup *save_current_inferior (void);
 610
 611 /* Traverse all inferiors.  */
 612
 613 #define ALL_INFERIORS(I) \
 614   for ((I) = inferior_list; (I); (I) = (I)->next)
 615
 616 extern struct inferior *inferior_list;
 617
 618 /* Prune away automatically added inferiors that aren't required
 619    anymore.  */
 620 extern void prune_inferiors (void);
 621
 622 extern int number_of_inferiors (void);
 623
 624 extern struct inferior *add_inferior_with_spaces (void);
 625
 626 extern void update_observer_mode (void);
 627
 628 extern void update_signals_program_target (void);
 629
 630 extern void signal_catch_update (const unsigned int *);
 631
 632 /* In some circumstances we allow a command to specify a numeric
 633    signal.  The idea is to keep these circumstances limited so that
 634    users (and scripts) develop portable habits.  For comparison,
 635    POSIX.2 `kill' requires that 1,2,3,6,9,14, and 15 work (and using a
 636    numeric signal at all is obsolescent.  We are slightly more lenient
 637    and allow 1-15 which should match host signal numbers on most
 638    systems.  Use of symbolic signal names is strongly encouraged.  */
 639
 640 enum gdb_signal gdb_signal_from_command (int num);
 641
 642 #endif /* !defined (INFERIOR_H) */