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, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
   5    1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008
   6    Free Software Foundation, Inc.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #if !defined (INFERIOR_H)
  24 #define INFERIOR_H 1
  25
  26 struct target_waitstatus;
  27 struct frame_info;
  28 struct ui_file;
  29 struct type;
  30 struct gdbarch;
  31 struct regcache;
  32 struct ui_out;
  33
  34 /* For bpstat.  */
  35 #include "breakpoint.h"
  36
  37 /* For enum target_signal.  */
  38 #include "target.h"
  39
  40 /* For struct frame_id.  */
  41 #include "frame.h"
  42
  43 /* Structure in which to save the status of the inferior.  Create/Save
  44    through "save_inferior_status", restore through
  45    "restore_inferior_status".
  46
  47    This pair of routines should be called around any transfer of
  48    control to the inferior which you don't want showing up in your
  49    control variables.  */
  50
  51 struct inferior_status;
  52
  53 extern struct inferior_status *save_inferior_status (int);
  54
  55 extern void restore_inferior_status (struct inferior_status *);
  56
  57 extern struct cleanup *make_cleanup_restore_inferior_status (struct inferior_status *);
  58
  59 extern void discard_inferior_status (struct inferior_status *);
  60
  61 extern void write_inferior_status_register (struct inferior_status
  62                                             *inf_status, int regno,
  63                                             LONGEST val);
  64
  65 /* The -1 ptid, often used to indicate either an error condition
  66    or a "don't care" condition, i.e, "run all threads."  */
  67 extern ptid_t minus_one_ptid;
  68
  69 /* The null or zero ptid, often used to indicate no process. */
  70 extern ptid_t null_ptid;
  71
  72 /* Attempt to find and return an existing ptid with the given PID, LWP,
  73    and TID components.  If none exists, create a new one and return
  74    that.  */
  75 ptid_t ptid_build (int pid, long lwp, long tid);
  76
  77 /* Find/Create a ptid from just a pid. */
  78 ptid_t pid_to_ptid (int pid);
  79
  80 /* Fetch the pid (process id) component from a ptid. */
  81 int ptid_get_pid (ptid_t ptid);
  82
  83 /* Fetch the lwp (lightweight process) component from a ptid. */
  84 long ptid_get_lwp (ptid_t ptid);
  85
  86 /* Fetch the tid (thread id) component from a ptid. */
  87 long ptid_get_tid (ptid_t ptid);
  88
  89 /* Compare two ptids to see if they are equal */
  90 extern int ptid_equal (ptid_t p1, ptid_t p2);
  91
  92 /* Save value of inferior_ptid so that it may be restored by
  93    a later call to do_cleanups().  Returns the struct cleanup
  94    pointer needed for later doing the cleanup.  */
  95 extern struct cleanup * save_inferior_ptid (void);
  96
  97 extern void set_sigint_trap (void);
  98
  99 extern void clear_sigint_trap (void);
 100
 101 extern void set_sigio_trap (void);
 102
 103 extern void clear_sigio_trap (void);
 104
 105 /* Set/get file name for default use for standard in/out in the inferior.  */
 106
 107 extern void set_inferior_io_terminal (const char *terminal_name);
 108 extern const char *get_inferior_io_terminal (void);
 109
 110 /* Collected pid, tid, etc. of the debugged inferior.  When there's
 111    no inferior, PIDGET (inferior_ptid) will be 0. */
 112
 113 extern ptid_t inferior_ptid;
 114
 115 /* Are we simulating synchronous execution? This is used in async gdb
 116    to implement the 'run', 'continue' etc commands, which will not
 117    redisplay the prompt until the execution is actually over. */
 118 extern int sync_execution;
 119
 120 /* Some targets (stupidly) report more than one exec event per actual
 121    call to an event() system call.  If only the last such exec event
 122    need actually be noticed and responded to by the debugger (i.e.,
 123    be reported to the user), then this is the number of "leading"
 124    exec events which should be ignored.
 125  */
 126 extern int inferior_ignoring_leading_exec_events;
 127
 128 /* Inferior environment. */
 129
 130 extern struct gdb_environ *inferior_environ;
 131
 132 extern void clear_proceed_status (void);
 133
 134 extern void proceed (CORE_ADDR, enum target_signal, int);
 135
 136 /* When set, stop the 'step' command if we enter a function which has
 137    no line number information.  The normal behavior is that we step
 138    over such function.  */
 139 extern int step_stop_if_no_debug;
 140
 141 /* If set, the inferior should be controlled in non-stop mode.  In
 142    this mode, each thread is controlled independently.  Execution
 143    commands apply only to the the selected thread by default, and stop
 144    events stop only the thread that had the event -- the other threads
 145    are kept running freely.  */
 146 extern int non_stop;
 147
 148 extern void generic_mourn_inferior (void);
 149
 150 extern void terminal_save_ours (void);
 151
 152 extern void terminal_ours (void);
 153
 154 extern CORE_ADDR read_pc (void);
 155
 156 extern void write_pc (CORE_ADDR);
 157
 158 extern CORE_ADDR unsigned_pointer_to_address (struct type *type,
 159                                               const gdb_byte *buf);
 160 extern void unsigned_address_to_pointer (struct type *type, gdb_byte *buf,
 161                                          CORE_ADDR addr);
 162 extern CORE_ADDR signed_pointer_to_address (struct type *type,
 163                                             const gdb_byte *buf);
 164 extern void address_to_signed_pointer (struct type *type, gdb_byte *buf,
 165                                        CORE_ADDR addr);
 166
 167 extern void wait_for_inferior (int treat_exec_as_sigtrap);
 168
 169 extern void fetch_inferior_event (void *);
 170
 171 extern void init_wait_for_inferior (void);
 172
 173 extern void close_exec_file (void);
 174
 175 extern void reopen_exec_file (void);
 176
 177 /* The `resume' routine should only be called in special circumstances.
 178    Normally, use `proceed', which handles a lot of bookkeeping.  */
 179
 180 extern void resume (int, enum target_signal);
 181
 182 /* From misc files */
 183
 184 extern void default_print_registers_info (struct gdbarch *gdbarch,
 185                                           struct ui_file *file,
 186                                           struct frame_info *frame,
 187                                           int regnum, int all);
 188
 189 extern void child_terminal_info (char *, int);
 190
 191 extern void term_info (char *, int);
 192
 193 extern void terminal_ours_for_output (void);
 194
 195 extern void terminal_inferior (void);
 196
 197 extern void terminal_init_inferior (void);
 198
 199 extern void terminal_init_inferior_with_pgrp (int pgrp);
 200
 201 /* From procfs.c */
 202
 203 extern int proc_iterate_over_mappings (int (*)(int, CORE_ADDR));
 204
 205 extern ptid_t procfs_first_available (void);
 206
 207 /* From fork-child.c */
 208
 209 extern void fork_inferior (char *, char *, char **,
 210                            void (*)(void),
 211                            void (*)(int), void (*)(void), char *);
 212
 213
 214 extern void startup_inferior (int);
 215
 216 extern char *construct_inferior_arguments (struct gdbarch *, int, char **);
 217
 218 /* From inflow.c */
 219
 220 extern void new_tty_prefork (const char *);
 221
 222 extern int gdb_has_a_terminal (void);
 223
 224 /* From infrun.c */
 225
 226 extern void start_remote (int from_tty);
 227
 228 extern void normal_stop (void);
 229
 230 extern int signal_stop_state (int);
 231
 232 extern int signal_print_state (int);
 233
 234 extern int signal_pass_state (int);
 235
 236 extern int signal_stop_update (int, int);
 237
 238 extern int signal_print_update (int, int);
 239
 240 extern int signal_pass_update (int, int);
 241
 242 extern void get_last_target_status(ptid_t *ptid,
 243                                    struct target_waitstatus *status);
 244
 245 extern void follow_inferior_reset_breakpoints (void);
 246
 247 /* Throw an error indicating the current thread is running.  */
 248 extern void error_is_running (void);
 249
 250 /* Calls error_is_running if the current thread is running.  */
 251 extern void ensure_not_running (void);
 252
 253 /* From infcmd.c */
 254
 255 extern void tty_command (char *, int);
 256
 257 extern void post_create_inferior (struct target_ops *, int);
 258
 259 extern void attach_command (char *, int);
 260
 261 extern char *get_inferior_args (void);
 262
 263 extern char *set_inferior_args (char *);
 264
 265 extern void set_inferior_args_vector (int, char **);
 266
 267 extern void registers_info (char *, int);
 268
 269 extern void nexti_command (char *, int);
 270
 271 extern void stepi_command (char *, int);
 272
 273 extern void continue_1 (int all_threads);
 274
 275 extern void continue_command (char *, int);
 276
 277 extern void interrupt_target_command (char *args, int from_tty);
 278
 279 extern void interrupt_target_1 (int all_threads);
 280
 281 /* Address at which inferior stopped.  */
 282
 283 extern CORE_ADDR stop_pc;
 284
 285 /* Flag indicating that a command has proceeded the inferior past the
 286    current breakpoint.  */
 287
 288 extern int breakpoint_proceeded;
 289
 290 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 291
 292 extern int stop_stack_dummy;
 293
 294 /* Nonzero if program stopped due to a random (unexpected) signal in
 295    inferior process.  */
 296
 297 extern int stopped_by_random_signal;
 298
 299 /* 1 means step over all subroutine calls.
 300    -1 means step over calls to undebuggable functions.  */
 301
 302 enum step_over_calls_kind
 303   {
 304     STEP_OVER_NONE,
 305     STEP_OVER_ALL,
 306     STEP_OVER_UNDEBUGGABLE
 307   };
 308
 309 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
 310    will handle it themselves.  STOP_QUIETLY is used when running in
 311    the shell before the child program has been exec'd and when running
 312    through shared library loading.  STOP_QUIETLY_REMOTE is used when
 313    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
 314    except that there is no need to hide a signal.  */
 315
 316 /* It is also used after attach, due to attaching to a process. This
 317    is a bit trickier.  When doing an attach, the kernel stops the
 318    debuggee with a SIGSTOP.  On newer GNU/Linux kernels (>= 2.5.61)
 319    the handling of SIGSTOP for a ptraced process has changed. Earlier
 320    versions of the kernel would ignore these SIGSTOPs, while now
 321    SIGSTOP is treated like any other signal, i.e. it is not muffled.
 322
 323    If the gdb user does a 'continue' after the 'attach', gdb passes
 324    the global variable stop_signal (which stores the signal from the
 325    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
 326    problematic, because the kernel doesn't ignore such SIGSTOP
 327    now. I.e. it is reported back to gdb, which in turn presents it
 328    back to the user.
 329
 330    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
 331    gdb to clear the value of stop_signal after the attach, so that it
 332    is not passed back down to the kernel.  */
 333
 334 enum stop_kind
 335   {
 336     NO_STOP_QUIETLY = 0,
 337     STOP_QUIETLY,
 338     STOP_QUIETLY_REMOTE,
 339     STOP_QUIETLY_NO_SIGSTOP
 340   };
 341
 342 extern enum stop_kind stop_soon;
 343
 344 /* Nonzero if proceed is being used for a "finish" command or a similar
 345    situation when stop_registers should be saved.  */
 346
 347 extern int proceed_to_finish;
 348
 349 /* Save register contents here when about to pop a stack dummy frame,
 350    if-and-only-if proceed_to_finish is set.
 351    Thus this contains the return value from the called function (assuming
 352    values are returned in a register).  */
 353
 354 extern struct regcache *stop_registers;
 355
 356 /* Nonzero if the child process in inferior_ptid was attached rather
 357    than forked.  */
 358
 359 extern int attach_flag;
 360
 361 /* True if we are debugging displaced stepping.  */
 362 extern int debug_displaced;
 363
 364 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline.  */
 365 void displaced_step_dump_bytes (struct ui_file *file,
 366                                 const gdb_byte *buf, size_t len);
 367
 368
 369 /* When set, normal_stop will not call the normal_stop observer.  */
 370 extern int suppress_stop_observer;
 371
 372 /* When set, no calls to target_resumed observer will be made.  */
 373 extern int suppress_resume_observer;
 374
 375 \f
 376 /* Possible values for gdbarch_call_dummy_location.  */
 377 #define ON_STACK 1
 378 #define AT_ENTRY_POINT 4
 379 #define AT_SYMBOL 5
 380
 381 /* If STARTUP_WITH_SHELL is set, GDB's "run"
 382    will attempts to start up the debugee under a shell.
 383    This is in order for argument-expansion to occur. E.g.,
 384    (gdb) run *
 385    The "*" gets expanded by the shell into a list of files.
 386    While this is a nice feature, it turns out to interact badly
 387    with some of the catch-fork/catch-exec features we have added.
 388    In particular, if the shell does any fork/exec's before
 389    the exec of the target program, that can confuse GDB.
 390    To disable this feature, set STARTUP_WITH_SHELL to 0.
 391    To enable this feature, set STARTUP_WITH_SHELL to 1.
 392    The catch-exec traps expected during start-up will
 393    be 1 if target is not started up with a shell, 2 if it is.
 394    - RT
 395    If you disable this, you need to decrement
 396    START_INFERIOR_TRAPS_EXPECTED in tm.h. */
 397 #define STARTUP_WITH_SHELL 1
 398 #if !defined(START_INFERIOR_TRAPS_EXPECTED)
 399 #define START_INFERIOR_TRAPS_EXPECTED   2
 400 #endif
 401
 402 struct private_inferior;
 403
 404 /* GDB represents the state of each program execution with an object
 405    called an inferior.  An inferior typically corresponds to a process
 406    but is more general and applies also to targets that do not have a
 407    notion of processes.  Each run of an executable creates a new
 408    inferior, as does each attachment to an existing process.
 409    Inferiors have unique internal identifiers that are different from
 410    target process ids.  Each inferior may in turn have multiple
 411    threads running in it.  */
 412
 413 struct inferior
 414 {
 415   /* Pointer to next inferior in singly-linked list of inferiors.  */
 416   struct inferior *next;
 417
 418   /* Convenient handle (GDB inferior id).  Unique across all
 419      inferiors.  */
 420   int num;
 421
 422   /* Actual target inferior id, usually, a process id.  This matches
 423      the ptid_t.pid member of threads of this inferior.  */
 424   int pid;
 425
 426   /* Private data used by the target vector implementation.  */
 427   struct private_inferior *private;
 428 };
 429
 430 /* Create an empty inferior list, or empty the existing one.  */
 431 extern void init_inferior_list (void);
 432
 433 /* Add an inferior to the inferior list, print a message that a new
 434    inferior is found, and return the pointer to the new inferior.
 435    Caller may use this pointer to initialize the private inferior
 436    data.  */
 437 extern struct inferior *add_inferior (int pid);
 438
 439 /* Same as add_inferior, but don't print new inferior notifications to
 440    the CLI.  */
 441 extern struct inferior *add_inferior_silent (int pid);
 442
 443 /* Delete an existing inferior list entry, due to inferior exit.  */
 444 extern void delete_inferior (int pid);
 445
 446 /* Same as delete_inferior, but don't print new inferior notifications
 447    to the CLI.  */
 448 extern void delete_inferior_silent (int pid);
 449
 450 /* Delete an existing inferior list entry, due to inferior detaching.  */
 451 extern void detach_inferior (int pid);
 452
 453 /* Get rid of all inferiors.  */
 454 extern void discard_all_inferiors (void);
 455
 456 /* Translate the integer inferior id (GDB's homegrown id, not the system's)
 457    into a "pid" (which may be overloaded with extra inferior information).  */
 458 extern int gdb_inferior_id_to_pid (int);
 459
 460 /* Translate a target 'pid' into the integer inferior id (GDB's
 461    homegrown id, not the system's).  */
 462 extern int pid_to_gdb_inferior_id (int pid);
 463
 464 /* Boolean test for an already-known pid.  */
 465 extern int in_inferior_list (int pid);
 466
 467 /* Boolean test for an already-known inferior id (GDB's homegrown id,
 468    not the system's).  */
 469 extern int valid_inferior_id (int num);
 470
 471 /* Search function to lookup a inferior by target 'pid'.  */
 472 extern struct inferior *find_inferior_pid (int pid);
 473
 474 /* Inferior iterator function.
 475
 476    Calls a callback function once for each inferior, so long as the
 477    callback function returns false.  If the callback function returns
 478    true, the iteration will end and the current inferior will be
 479    returned.  This can be useful for implementing a search for a
 480    inferior with arbitrary attributes, or for applying some operation
 481    to every inferior.
 482
 483    It is safe to delete the iterated inferior from the callback.  */
 484 extern struct inferior *iterate_over_inferiors (int (*) (struct inferior *,
 485                                                          void *),
 486                                                 void *);
 487
 488 /* Prints the list of inferiors and their details on UIOUT.
 489
 490    If REQUESTED_INFERIOR is not -1, it's the GDB id of the inferior
 491    that should be printed.  Otherwise, all inferiors are printed.  */
 492 extern void print_inferior (struct ui_out *uiout, int requested_inferior);
 493
 494 /* Returns true if the inferior list is not empty.  */
 495 extern int have_inferiors (void);
 496
 497 /* Return a pointer to the current inferior.  It is an error to call
 498    this if there is no current inferior.  */
 499 extern struct inferior *current_inferior (void);
 500
 501 #endif /* !defined (INFERIOR_H) */