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
  33 /* For bpstat.  */
  34 #include "breakpoint.h"
  35
  36 /* For enum target_signal.  */
  37 #include "target.h"
  38
  39 /* For struct frame_id.  */
  40 #include "frame.h"
  41
  42 /* Structure in which to save the status of the inferior.  Create/Save
  43    through "save_inferior_status", restore through
  44    "restore_inferior_status".
  45
  46    This pair of routines should be called around any transfer of
  47    control to the inferior which you don't want showing up in your
  48    control variables.  */
  49
  50 struct inferior_status;
  51
  52 extern struct inferior_status *save_inferior_status (int);
  53
  54 extern void restore_inferior_status (struct inferior_status *);
  55
  56 extern struct cleanup *make_cleanup_restore_inferior_status (struct inferior_status *);
  57
  58 extern void discard_inferior_status (struct inferior_status *);
  59
  60 extern void write_inferior_status_register (struct inferior_status
  61                                             *inf_status, int regno,
  62                                             LONGEST val);
  63
  64 /* The -1 ptid, often used to indicate either an error condition
  65    or a "don't care" condition, i.e, "run all threads."  */
  66 extern ptid_t minus_one_ptid;
  67
  68 /* The null or zero ptid, often used to indicate no process. */
  69 extern ptid_t null_ptid;
  70
  71 /* Attempt to find and return an existing ptid with the given PID, LWP,
  72    and TID components.  If none exists, create a new one and return
  73    that.  */
  74 ptid_t ptid_build (int pid, long lwp, long tid);
  75
  76 /* Find/Create a ptid from just a pid. */
  77 ptid_t pid_to_ptid (int pid);
  78
  79 /* Fetch the pid (process id) component from a ptid. */
  80 int ptid_get_pid (ptid_t ptid);
  81
  82 /* Fetch the lwp (lightweight process) component from a ptid. */
  83 long ptid_get_lwp (ptid_t ptid);
  84
  85 /* Fetch the tid (thread id) component from a ptid. */
  86 long ptid_get_tid (ptid_t ptid);
  87
  88 /* Compare two ptids to see if they are equal */
  89 extern int ptid_equal (ptid_t p1, ptid_t p2);
  90
  91 /* Save value of inferior_ptid so that it may be restored by
  92    a later call to do_cleanups().  Returns the struct cleanup
  93    pointer needed for later doing the cleanup.  */
  94 extern struct cleanup * save_inferior_ptid (void);
  95
  96 extern void set_sigint_trap (void);
  97
  98 extern void clear_sigint_trap (void);
  99
 100 extern void set_sigio_trap (void);
 101
 102 extern void clear_sigio_trap (void);
 103
 104 /* Set/get file name for default use for standard in/out in the inferior.  */
 105
 106 extern void set_inferior_io_terminal (const char *terminal_name);
 107 extern const char *get_inferior_io_terminal (void);
 108
 109 /* Collected pid, tid, etc. of the debugged inferior.  When there's
 110    no inferior, PIDGET (inferior_ptid) will be 0. */
 111
 112 extern ptid_t inferior_ptid;
 113
 114 /* Are we simulating synchronous execution? This is used in async gdb
 115    to implement the 'run', 'continue' etc commands, which will not
 116    redisplay the prompt until the execution is actually over. */
 117 extern int sync_execution;
 118
 119 /* Some targets (stupidly) report more than one exec event per actual
 120    call to an event() system call.  If only the last such exec event
 121    need actually be noticed and responded to by the debugger (i.e.,
 122    be reported to the user), then this is the number of "leading"
 123    exec events which should be ignored.
 124  */
 125 extern int inferior_ignoring_leading_exec_events;
 126
 127 /* Inferior environment. */
 128
 129 extern struct gdb_environ *inferior_environ;
 130
 131 extern void clear_proceed_status (void);
 132
 133 extern void proceed (CORE_ADDR, enum target_signal, int);
 134
 135 /* When set, stop the 'step' command if we enter a function which has
 136    no line number information.  The normal behavior is that we step
 137    over such function.  */
 138 extern int step_stop_if_no_debug;
 139
 140 /* If set, the inferior should be controlled in non-stop mode.  In
 141    this mode, each thread is controlled independently.  Execution
 142    commands apply only to the the selected thread by default, and stop
 143    events stop only the thread that had the event -- the other threads
 144    are kept running freely.  */
 145 extern int non_stop;
 146
 147 extern void generic_mourn_inferior (void);
 148
 149 extern void terminal_save_ours (void);
 150
 151 extern void terminal_ours (void);
 152
 153 extern CORE_ADDR read_pc (void);
 154
 155 extern void write_pc (CORE_ADDR);
 156
 157 extern CORE_ADDR unsigned_pointer_to_address (struct type *type,
 158                                               const gdb_byte *buf);
 159 extern void unsigned_address_to_pointer (struct type *type, gdb_byte *buf,
 160                                          CORE_ADDR addr);
 161 extern CORE_ADDR signed_pointer_to_address (struct type *type,
 162                                             const gdb_byte *buf);
 163 extern void address_to_signed_pointer (struct type *type, gdb_byte *buf,
 164                                        CORE_ADDR addr);
 165
 166 extern void wait_for_inferior (int treat_exec_as_sigtrap);
 167
 168 extern void fetch_inferior_event (void *);
 169
 170 extern void init_wait_for_inferior (void);
 171
 172 extern void close_exec_file (void);
 173
 174 extern void reopen_exec_file (void);
 175
 176 /* The `resume' routine should only be called in special circumstances.
 177    Normally, use `proceed', which handles a lot of bookkeeping.  */
 178
 179 extern void resume (int, enum target_signal);
 180
 181 /* From misc files */
 182
 183 extern void default_print_registers_info (struct gdbarch *gdbarch,
 184                                           struct ui_file *file,
 185                                           struct frame_info *frame,
 186                                           int regnum, int all);
 187
 188 extern void child_terminal_info (char *, int);
 189
 190 extern void term_info (char *, int);
 191
 192 extern void terminal_ours_for_output (void);
 193
 194 extern void terminal_inferior (void);
 195
 196 extern void terminal_init_inferior (void);
 197
 198 extern void terminal_init_inferior_with_pgrp (int pgrp);
 199
 200 /* From procfs.c */
 201
 202 extern int proc_iterate_over_mappings (int (*)(int, CORE_ADDR));
 203
 204 extern ptid_t procfs_first_available (void);
 205
 206 /* From fork-child.c */
 207
 208 extern void fork_inferior (char *, char *, char **,
 209                            void (*)(void),
 210                            void (*)(int), void (*)(void), char *);
 211
 212
 213 extern void startup_inferior (int);
 214
 215 extern char *construct_inferior_arguments (struct gdbarch *, int, char **);
 216
 217 /* From inflow.c */
 218
 219 extern void new_tty_prefork (const char *);
 220
 221 extern int gdb_has_a_terminal (void);
 222
 223 /* From infrun.c */
 224
 225 extern void start_remote (int from_tty);
 226
 227 extern void normal_stop (void);
 228
 229 extern int signal_stop_state (int);
 230
 231 extern int signal_print_state (int);
 232
 233 extern int signal_pass_state (int);
 234
 235 extern int signal_stop_update (int, int);
 236
 237 extern int signal_print_update (int, int);
 238
 239 extern int signal_pass_update (int, int);
 240
 241 extern void get_last_target_status(ptid_t *ptid,
 242                                    struct target_waitstatus *status);
 243
 244 extern void follow_inferior_reset_breakpoints (void);
 245
 246 /* Throw an error indicating the current thread is running.  */
 247 extern void error_is_running (void);
 248
 249 /* Calls error_is_running if the current thread is running.  */
 250 extern void ensure_not_running (void);
 251
 252 /* From infcmd.c */
 253
 254 extern void tty_command (char *, int);
 255
 256 extern void post_create_inferior (struct target_ops *, int);
 257
 258 extern void attach_command (char *, int);
 259
 260 extern char *get_inferior_args (void);
 261
 262 extern char *set_inferior_args (char *);
 263
 264 extern void set_inferior_args_vector (int, char **);
 265
 266 extern void registers_info (char *, int);
 267
 268 extern void nexti_command (char *, int);
 269
 270 extern void stepi_command (char *, int);
 271
 272 extern void continue_1 (int all_threads);
 273
 274 extern void continue_command (char *, int);
 275
 276 extern void interrupt_target_command (char *args, int from_tty);
 277
 278 extern void interrupt_target_1 (int all_threads);
 279
 280 /* Address at which inferior stopped.  */
 281
 282 extern CORE_ADDR stop_pc;
 283
 284 /* Flag indicating that a command has proceeded the inferior past the
 285    current breakpoint.  */
 286
 287 extern int breakpoint_proceeded;
 288
 289 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 290
 291 extern int stop_stack_dummy;
 292
 293 /* Nonzero if program stopped due to a random (unexpected) signal in
 294    inferior process.  */
 295
 296 extern int stopped_by_random_signal;
 297
 298 /* 1 means step over all subroutine calls.
 299    -1 means step over calls to undebuggable functions.  */
 300
 301 enum step_over_calls_kind
 302   {
 303     STEP_OVER_NONE,
 304     STEP_OVER_ALL,
 305     STEP_OVER_UNDEBUGGABLE
 306   };
 307
 308 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
 309    will handle it themselves.  STOP_QUIETLY is used when running in
 310    the shell before the child program has been exec'd and when running
 311    through shared library loading.  STOP_QUIETLY_REMOTE is used when
 312    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
 313    except that there is no need to hide a signal.  */
 314
 315 /* It is also used after attach, due to attaching to a process. This
 316    is a bit trickier.  When doing an attach, the kernel stops the
 317    debuggee with a SIGSTOP.  On newer GNU/Linux kernels (>= 2.5.61)
 318    the handling of SIGSTOP for a ptraced process has changed. Earlier
 319    versions of the kernel would ignore these SIGSTOPs, while now
 320    SIGSTOP is treated like any other signal, i.e. it is not muffled.
 321
 322    If the gdb user does a 'continue' after the 'attach', gdb passes
 323    the global variable stop_signal (which stores the signal from the
 324    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
 325    problematic, because the kernel doesn't ignore such SIGSTOP
 326    now. I.e. it is reported back to gdb, which in turn presents it
 327    back to the user.
 328
 329    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
 330    gdb to clear the value of stop_signal after the attach, so that it
 331    is not passed back down to the kernel.  */
 332
 333 enum stop_kind
 334   {
 335     NO_STOP_QUIETLY = 0,
 336     STOP_QUIETLY,
 337     STOP_QUIETLY_REMOTE,
 338     STOP_QUIETLY_NO_SIGSTOP
 339   };
 340
 341 extern enum stop_kind stop_soon;
 342
 343 /* Nonzero if proceed is being used for a "finish" command or a similar
 344    situation when stop_registers should be saved.  */
 345
 346 extern int proceed_to_finish;
 347
 348 /* Save register contents here when about to pop a stack dummy frame,
 349    if-and-only-if proceed_to_finish is set.
 350    Thus this contains the return value from the called function (assuming
 351    values are returned in a register).  */
 352
 353 extern struct regcache *stop_registers;
 354
 355 /* Nonzero if the child process in inferior_ptid was attached rather
 356    than forked.  */
 357
 358 extern int attach_flag;
 359
 360 /* True if we are debugging displaced stepping.  */
 361 extern int debug_displaced;
 362
 363 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline.  */
 364 void displaced_step_dump_bytes (struct ui_file *file,
 365                                 const gdb_byte *buf, size_t len);
 366
 367
 368 /* When set, normal_stop will not call the normal_stop observer.  */
 369 extern int suppress_stop_observer;
 370
 371 /* When set, no calls to target_resumed observer will be made.  */
 372 extern int suppress_resume_observer;
 373
 374 \f
 375 /* Possible values for gdbarch_call_dummy_location.  */
 376 #define ON_STACK 1
 377 #define AT_ENTRY_POINT 4
 378 #define AT_SYMBOL 5
 379
 380 /* If STARTUP_WITH_SHELL is set, GDB's "run"
 381    will attempts to start up the debugee under a shell.
 382    This is in order for argument-expansion to occur. E.g.,
 383    (gdb) run *
 384    The "*" gets expanded by the shell into a list of files.
 385    While this is a nice feature, it turns out to interact badly
 386    with some of the catch-fork/catch-exec features we have added.
 387    In particular, if the shell does any fork/exec's before
 388    the exec of the target program, that can confuse GDB.
 389    To disable this feature, set STARTUP_WITH_SHELL to 0.
 390    To enable this feature, set STARTUP_WITH_SHELL to 1.
 391    The catch-exec traps expected during start-up will
 392    be 1 if target is not started up with a shell, 2 if it is.
 393    - RT
 394    If you disable this, you need to decrement
 395    START_INFERIOR_TRAPS_EXPECTED in tm.h. */
 396 #define STARTUP_WITH_SHELL 1
 397 #if !defined(START_INFERIOR_TRAPS_EXPECTED)
 398 #define START_INFERIOR_TRAPS_EXPECTED   2
 399 #endif
 400 #endif /* !defined (INFERIOR_H) */