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) 1986-2014 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 /* Save value of inferior_ptid so that it may be restored by
  69    a later call to do_cleanups().  Returns the struct cleanup
  70    pointer needed for later doing the cleanup.  */
  71 extern struct cleanup * save_inferior_ptid (void);
  72
  73 extern void set_sigint_trap (void);
  74
  75 extern void clear_sigint_trap (void);
  76
  77 /* Set/get file name for default use for standard in/out in the inferior.  */
  78
  79 extern void set_inferior_io_terminal (const char *terminal_name);
  80 extern const char *get_inferior_io_terminal (void);
  81
  82 /* Collected pid, tid, etc. of the debugged inferior.  When there's
  83    no inferior, ptid_get_pid (inferior_ptid) will be 0.  */
  84
  85 extern ptid_t inferior_ptid;
  86
  87 /* Are we simulating synchronous execution? This is used in async gdb
  88    to implement the 'run', 'continue' etc commands, which will not
  89    redisplay the prompt until the execution is actually over.  */
  90 extern int sync_execution;
  91
  92 /* Inferior environment.  */
  93
  94 extern void clear_proceed_status (void);
  95
  96 extern void proceed (CORE_ADDR, enum gdb_signal, int);
  97
  98 extern int sched_multi;
  99
 100 /* When set, stop the 'step' command if we enter a function which has
 101    no line number information.  The normal behavior is that we step
 102    over such function.  */
 103 extern int step_stop_if_no_debug;
 104
 105 /* If set, the inferior should be controlled in non-stop mode.  In
 106    this mode, each thread is controlled independently.  Execution
 107    commands apply only to the selected thread by default, and stop
 108    events stop only the thread that had the event -- the other threads
 109    are kept running freely.  */
 110 extern int non_stop;
 111
 112 /* When set (default), the target should attempt to disable the operating
 113    system's address space randomization feature when starting an inferior.  */
 114 extern int disable_randomization;
 115
 116 extern void generic_mourn_inferior (void);
 117
 118 extern CORE_ADDR unsigned_pointer_to_address (struct gdbarch *gdbarch,
 119                                               struct type *type,
 120                                               const gdb_byte *buf);
 121 extern void unsigned_address_to_pointer (struct gdbarch *gdbarch,
 122                                          struct type *type, gdb_byte *buf,
 123                                          CORE_ADDR addr);
 124 extern CORE_ADDR signed_pointer_to_address (struct gdbarch *gdbarch,
 125                                             struct type *type,
 126                                             const gdb_byte *buf);
 127 extern void address_to_signed_pointer (struct gdbarch *gdbarch,
 128                                        struct type *type, gdb_byte *buf,
 129                                        CORE_ADDR addr);
 130
 131 extern void wait_for_inferior (void);
 132
 133 extern void prepare_for_detach (void);
 134
 135 extern void fetch_inferior_event (void *);
 136
 137 extern void init_wait_for_inferior (void);
 138
 139 extern void reopen_exec_file (void);
 140
 141 /* The `resume' routine should only be called in special circumstances.
 142    Normally, use `proceed', which handles a lot of bookkeeping.  */
 143
 144 extern void resume (int, enum gdb_signal);
 145
 146 extern ptid_t user_visible_resume_ptid (int step);
 147
 148 extern void insert_step_resume_breakpoint_at_sal (struct gdbarch *,
 149                                                   struct symtab_and_line ,
 150                                                   struct frame_id);
 151
 152 /* From misc files */
 153
 154 extern void default_print_registers_info (struct gdbarch *gdbarch,
 155                                           struct ui_file *file,
 156                                           struct frame_info *frame,
 157                                           int regnum, int all);
 158
 159 extern void child_terminal_info (struct target_ops *self, const char *, int);
 160
 161 extern void term_info (char *, int);
 162
 163 extern void child_terminal_save_ours (struct target_ops *self);
 164
 165 extern void child_terminal_ours (struct target_ops *self);
 166
 167 extern void child_terminal_ours_for_output (struct target_ops *self);
 168
 169 extern void child_terminal_inferior (struct target_ops *self);
 170
 171 extern void child_terminal_init (struct target_ops *self);
 172
 173 extern void child_terminal_init_with_pgrp (int pgrp);
 174
 175 /* From fork-child.c */
 176
 177 extern int fork_inferior (char *, char *, char **,
 178                           void (*)(void),
 179                           void (*)(int), void (*)(void), char *,
 180                           void (*)(const char *,
 181                                    char * const *, char * const *));
 182
 183
 184 extern void startup_inferior (int);
 185
 186 extern char *construct_inferior_arguments (int, char **);
 187
 188 /* From infrun.c */
 189
 190 extern unsigned int debug_infrun;
 191
 192 extern int stop_on_solib_events;
 193
 194 extern void start_remote (int from_tty);
 195
 196 extern void normal_stop (void);
 197
 198 extern void print_stop_event (struct target_waitstatus *ws);
 199
 200 extern int signal_stop_state (int);
 201
 202 extern int signal_print_state (int);
 203
 204 extern int signal_pass_state (int);
 205
 206 extern int signal_stop_update (int, int);
 207
 208 extern int signal_print_update (int, int);
 209
 210 extern int signal_pass_update (int, int);
 211
 212 extern void get_last_target_status(ptid_t *ptid,
 213                                    struct target_waitstatus *status);
 214
 215 extern void follow_inferior_reset_breakpoints (void);
 216
 217 void set_step_info (struct frame_info *frame, struct symtab_and_line sal);
 218
 219 /* Clear the convenience variables associated with the exit of the
 220    inferior.  Currently, those variables are $_exitcode and
 221    $_exitsignal.  */
 222
 223 extern void clear_exit_convenience_vars (void);
 224
 225 /* From infcmd.c */
 226
 227 extern void post_create_inferior (struct target_ops *, int);
 228
 229 extern void attach_command (char *, int);
 230
 231 extern char *get_inferior_args (void);
 232
 233 extern void set_inferior_args (char *);
 234
 235 extern void set_inferior_args_vector (int, char **);
 236
 237 extern void registers_info (char *, int);
 238
 239 extern void continue_1 (int all_threads);
 240
 241 extern void interrupt_target_1 (int all_threads);
 242
 243 extern void delete_longjmp_breakpoint_cleanup (void *arg);
 244
 245 extern void detach_command (char *, int);
 246
 247 extern void notice_new_inferior (ptid_t, int, int);
 248
 249 extern struct value *get_return_value (struct value *function,
 250                                        struct type *value_type);
 251
 252 /* Whether to start up the debuggee under a shell.
 253
 254    If startup-with-shell is set, GDB's "run" will attempt to start up
 255    the debuggee under a shell.
 256
 257    This is in order for argument-expansion to occur.  E.g.,
 258
 259    (gdb) run *
 260
 261    The "*" gets expanded by the shell into a list of files.
 262
 263    While this is a nice feature, it may be handy to bypass the shell
 264    in some cases.  To disable this feature, do "set startup-with-shell
 265    false".
 266
 267    The catch-exec traps expected during start-up will be one more if
 268    the target is started up with a shell.  */
 269 extern int startup_with_shell;
 270
 271 /* Address at which inferior stopped.  */
 272
 273 extern CORE_ADDR stop_pc;
 274
 275 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 276
 277 extern enum stop_stack_kind stop_stack_dummy;
 278
 279 /* Nonzero if program stopped due to a random (unexpected) signal in
 280    inferior process.  */
 281
 282 extern int stopped_by_random_signal;
 283
 284 /* STEP_OVER_ALL means step over all subroutine calls.
 285    STEP_OVER_UNDEBUGGABLE means step over calls to undebuggable functions.
 286    STEP_OVER_NONE means don't step over any subroutine calls.  */
 287
 288 enum step_over_calls_kind
 289   {
 290     STEP_OVER_NONE,
 291     STEP_OVER_ALL,
 292     STEP_OVER_UNDEBUGGABLE
 293   };
 294
 295 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
 296    will handle it themselves.  STOP_QUIETLY is used when running in
 297    the shell before the child program has been exec'd and when running
 298    through shared library loading.  STOP_QUIETLY_REMOTE is used when
 299    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
 300    except that there is no need to hide a signal.  */
 301
 302 /* It is also used after attach, due to attaching to a process.  This
 303    is a bit trickier.  When doing an attach, the kernel stops the
 304    debuggee with a SIGSTOP.  On newer GNU/Linux kernels (>= 2.5.61)
 305    the handling of SIGSTOP for a ptraced process has changed.  Earlier
 306    versions of the kernel would ignore these SIGSTOPs, while now
 307    SIGSTOP is treated like any other signal, i.e. it is not muffled.
 308
 309    If the gdb user does a 'continue' after the 'attach', gdb passes
 310    the global variable stop_signal (which stores the signal from the
 311    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
 312    problematic, because the kernel doesn't ignore such SIGSTOP
 313    now.  I.e. it is reported back to gdb, which in turn presents it
 314    back to the user.
 315
 316    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
 317    gdb to clear the value of stop_signal after the attach, so that it
 318    is not passed back down to the kernel.  */
 319
 320 enum stop_kind
 321   {
 322     NO_STOP_QUIETLY = 0,
 323     STOP_QUIETLY,
 324     STOP_QUIETLY_REMOTE,
 325     STOP_QUIETLY_NO_SIGSTOP
 326   };
 327
 328 /* Reverse execution.  */
 329 enum exec_direction_kind
 330   {
 331     EXEC_FORWARD,
 332     EXEC_REVERSE
 333   };
 334
 335 /* The current execution direction.  This should only be set to enum
 336    exec_direction_kind values.  It is only an int to make it
 337    compatible with make_cleanup_restore_integer.  */
 338 extern int execution_direction;
 339
 340 /* Save register contents here when executing a "finish" command or are
 341    about to pop a stack dummy frame, if-and-only-if proceed_to_finish is set.
 342    Thus this contains the return value from the called function (assuming
 343    values are returned in a register).  */
 344
 345 extern struct regcache *stop_registers;
 346
 347 /* True if we are debugging displaced stepping.  */
 348 extern int debug_displaced;
 349
 350 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline.  */
 351 void displaced_step_dump_bytes (struct ui_file *file,
 352                                 const gdb_byte *buf, size_t len);
 353
 354 struct displaced_step_closure *get_displaced_step_closure_by_addr (CORE_ADDR addr);
 355 \f
 356 /* Possible values for gdbarch_call_dummy_location.  */
 357 #define ON_STACK 1
 358 #define AT_ENTRY_POINT 4
 359
 360 /* Number of traps that happen between exec'ing the shell to run an
 361    inferior and when we finally get to the inferior code, not counting
 362    the exec for the shell.  This is 1 on most implementations.
 363    Overridden in nm.h files.  */
 364 #if !defined(START_INFERIOR_TRAPS_EXPECTED)
 365 #define START_INFERIOR_TRAPS_EXPECTED   1
 366 #endif
 367
 368 struct private_inferior;
 369
 370 /* Inferior process specific part of `struct infcall_control_state'.
 371
 372    Inferior thread counterpart is `struct thread_control_state'.  */
 373
 374 struct inferior_control_state
 375 {
 376   /* See the definition of stop_kind above.  */
 377   enum stop_kind stop_soon;
 378 };
 379
 380 /* Inferior process specific part of `struct infcall_suspend_state'.
 381
 382    Inferior thread counterpart is `struct thread_suspend_state'.  */
 383
 384 #if 0 /* Currently unused and empty structures are not valid C.  */
 385 struct inferior_suspend_state
 386 {
 387 };
 388 #endif
 389
 390 /* GDB represents the state of each program execution with an object
 391    called an inferior.  An inferior typically corresponds to a process
 392    but is more general and applies also to targets that do not have a
 393    notion of processes.  Each run of an executable creates a new
 394    inferior, as does each attachment to an existing process.
 395    Inferiors have unique internal identifiers that are different from
 396    target process ids.  Each inferior may in turn have multiple
 397    threads running in it.  */
 398
 399 struct inferior
 400 {
 401   /* Pointer to next inferior in singly-linked list of inferiors.  */
 402   struct inferior *next;
 403
 404   /* Convenient handle (GDB inferior id).  Unique across all
 405      inferiors.  */
 406   int num;
 407
 408   /* Actual target inferior id, usually, a process id.  This matches
 409      the ptid_t.pid member of threads of this inferior.  */
 410   int pid;
 411   /* True if the PID was actually faked by GDB.  */
 412   int fake_pid_p;
 413
 414   /* State of GDB control of inferior process execution.
 415      See `struct inferior_control_state'.  */
 416   struct inferior_control_state control;
 417
 418   /* State of inferior process to restore after GDB is done with an inferior
 419      call.  See `struct inferior_suspend_state'.  */
 420 #if 0 /* Currently unused and empty structures are not valid C.  */
 421   struct inferior_suspend_state suspend;
 422 #endif
 423
 424   /* True if this was an auto-created inferior, e.g. created from
 425      following a fork; false, if this inferior was manually added by
 426      the user, and we should not attempt to prune it
 427      automatically.  */
 428   int removable;
 429
 430   /* The address space bound to this inferior.  */
 431   struct address_space *aspace;
 432
 433   /* The program space bound to this inferior.  */
 434   struct program_space *pspace;
 435
 436   /* The arguments string to use when running.  */
 437   char *args;
 438
 439   /* The size of elements in argv.  */
 440   int argc;
 441
 442   /* The vector version of arguments.  If ARGC is nonzero,
 443      then we must compute ARGS from this (via the target).
 444      This is always coming from main's argv and therefore
 445      should never be freed.  */
 446   char **argv;
 447
 448   /* The name of terminal device to use for I/O.  */
 449   char *terminal;
 450
 451   /* Environment to use for running inferior,
 452      in format described in environ.h.  */
 453   struct gdb_environ *environment;
 454
 455   /* Nonzero if this child process was attached rather than
 456      forked.  */
 457   int attach_flag;
 458
 459   /* If this inferior is a vfork child, then this is the pointer to
 460      its vfork parent, if GDB is still attached to it.  */
 461   struct inferior *vfork_parent;
 462
 463   /* If this process is a vfork parent, this is the pointer to the
 464      child.  Since a vfork parent is left frozen by the kernel until
 465      the child execs or exits, a process can only have one vfork child
 466      at a given time.  */
 467   struct inferior *vfork_child;
 468
 469   /* True if this inferior should be detached when it's vfork sibling
 470      exits or execs.  */
 471   int pending_detach;
 472
 473   /* True if this inferior is a vfork parent waiting for a vfork child
 474      not under our control to be done with the shared memory region,
 475      either by exiting or execing.  */
 476   int waiting_for_vfork_done;
 477
 478   /* True if we're in the process of detaching from this inferior.  */
 479   int detaching;
 480
 481   /* What is left to do for an execution command after any thread of
 482      this inferior stops.  For continuations associated with a
 483      specific thread, see `struct thread_info'.  */
 484   struct continuation *continuations;
 485
 486   /* Private data used by the target vector implementation.  */
 487   struct private_inferior *private;
 488
 489   /* HAS_EXIT_CODE is true if the inferior exited with an exit code.
 490      In this case, the EXIT_CODE field is also valid.  */
 491   int has_exit_code;
 492   LONGEST exit_code;
 493
 494   /* Default flags to pass to the symbol reading functions.  These are
 495      used whenever a new objfile is created.  The valid values come
 496      from enum symfile_add_flags.  */
 497   int symfile_flags;
 498
 499   /* Info about an inferior's target description (if it's fetched; the
 500      user supplied description's filename, if any; etc.).  */
 501   struct target_desc_info *tdesc_info;
 502
 503   /* The architecture associated with the inferior through the
 504      connection to the target.
 505
 506      The architecture vector provides some information that is really
 507      a property of the inferior, accessed through a particular target:
 508      ptrace operations; the layout of certain RSP packets; the
 509      solib_ops vector; etc.  To differentiate architecture accesses to
 510      per-inferior/target properties from
 511      per-thread/per-frame/per-objfile properties, accesses to
 512      per-inferior/target properties should be made through
 513      this gdbarch.  */
 514   struct gdbarch *gdbarch;
 515
 516   /* Per inferior data-pointers required by other GDB modules.  */
 517   REGISTRY_FIELDS;
 518 };
 519
 520 /* Keep a registry of per-inferior data-pointers required by other GDB
 521    modules.  */
 522
 523 DECLARE_REGISTRY (inferior);
 524
 525 /* Create an empty inferior list, or empty the existing one.  */
 526 extern void init_inferior_list (void);
 527
 528 /* Add an inferior to the inferior list, print a message that a new
 529    inferior is found, and return the pointer to the new inferior.
 530    Caller may use this pointer to initialize the private inferior
 531    data.  */
 532 extern struct inferior *add_inferior (int pid);
 533
 534 /* Same as add_inferior, but don't print new inferior notifications to
 535    the CLI.  */
 536 extern struct inferior *add_inferior_silent (int pid);
 537
 538 /* Delete an existing inferior list entry, due to inferior exit.  */
 539 extern void delete_inferior (int pid);
 540
 541 extern void delete_inferior_1 (struct inferior *todel, int silent);
 542
 543 /* Same as delete_inferior, but don't print new inferior notifications
 544    to the CLI.  */
 545 extern void delete_inferior_silent (int pid);
 546
 547 /* Delete an existing inferior list entry, due to inferior detaching.  */
 548 extern void detach_inferior (int pid);
 549
 550 extern void exit_inferior (int pid);
 551
 552 extern void exit_inferior_silent (int pid);
 553
 554 extern void exit_inferior_num_silent (int num);
 555
 556 extern void inferior_appeared (struct inferior *inf, int pid);
 557
 558 /* Get rid of all inferiors.  */
 559 extern void discard_all_inferiors (void);
 560
 561 /* Translate the integer inferior id (GDB's homegrown id, not the system's)
 562    into a "pid" (which may be overloaded with extra inferior information).  */
 563 extern int gdb_inferior_id_to_pid (int);
 564
 565 /* Translate a target 'pid' into the integer inferior id (GDB's
 566    homegrown id, not the system's).  */
 567 extern int pid_to_gdb_inferior_id (int pid);
 568
 569 /* Boolean test for an already-known pid.  */
 570 extern int in_inferior_list (int pid);
 571
 572 /* Boolean test for an already-known inferior id (GDB's homegrown id,
 573    not the system's).  */
 574 extern int valid_gdb_inferior_id (int num);
 575
 576 /* Search function to lookup an inferior by target 'pid'.  */
 577 extern struct inferior *find_inferior_pid (int pid);
 578
 579 /* Search function to lookup an inferior by GDB 'num'.  */
 580 extern struct inferior *find_inferior_id (int num);
 581
 582 /* Find an inferior bound to PSPACE.  */
 583 extern struct inferior *
 584   find_inferior_for_program_space (struct program_space *pspace);
 585
 586 /* Inferior iterator function.
 587
 588    Calls a callback function once for each inferior, so long as the
 589    callback function returns false.  If the callback function returns
 590    true, the iteration will end and the current inferior will be
 591    returned.  This can be useful for implementing a search for a
 592    inferior with arbitrary attributes, or for applying some operation
 593    to every inferior.
 594
 595    It is safe to delete the iterated inferior from the callback.  */
 596 extern struct inferior *iterate_over_inferiors (int (*) (struct inferior *,
 597                                                          void *),
 598                                                 void *);
 599
 600 /* Returns true if the inferior list is not empty.  */
 601 extern int have_inferiors (void);
 602
 603 /* Returns true if there are any live inferiors in the inferior list
 604    (not cores, not executables, real live processes).  */
 605 extern int have_live_inferiors (void);
 606
 607 /* Return a pointer to the current inferior.  It is an error to call
 608    this if there is no current inferior.  */
 609 extern struct inferior *current_inferior (void);
 610
 611 extern void set_current_inferior (struct inferior *);
 612
 613 extern struct cleanup *save_current_inferior (void);
 614
 615 /* Traverse all inferiors.  */
 616
 617 #define ALL_INFERIORS(I) \
 618   for ((I) = inferior_list; (I); (I) = (I)->next)
 619
 620 extern struct inferior *inferior_list;
 621
 622 /* Prune away automatically added inferiors that aren't required
 623    anymore.  */
 624 extern void prune_inferiors (void);
 625
 626 extern int number_of_inferiors (void);
 627
 628 extern struct inferior *add_inferior_with_spaces (void);
 629
 630 extern void update_observer_mode (void);
 631
 632 extern void update_signals_program_target (void);
 633
 634 extern void signal_catch_update (const unsigned int *);
 635
 636 /* In some circumstances we allow a command to specify a numeric
 637    signal.  The idea is to keep these circumstances limited so that
 638    users (and scripts) develop portable habits.  For comparison,
 639    POSIX.2 `kill' requires that 1,2,3,6,9,14, and 15 work (and using a
 640    numeric signal at all is obsolescent.  We are slightly more lenient
 641    and allow 1-15 which should match host signal numbers on most
 642    systems.  Use of symbolic signal names is strongly encouraged.  */
 643
 644 enum gdb_signal gdb_signal_from_command (int num);
 645
 646 #endif /* !defined (INFERIOR_H) */