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 extern ptid_t context_switch_to (ptid_t ptid);
 136
 137 /* When set, stop the 'step' command if we enter a function which has
 138    no line number information.  The normal behavior is that we step
 139    over such function.  */
 140 extern int step_stop_if_no_debug;
 141
 142 /* If set, the inferior should be controlled in non-stop mode.  In
 143    this mode, each thread is controlled independently.  Execution
 144    commands apply only to the the selected thread by default, and stop
 145    events stop only the thread that had the event -- the other threads
 146    are kept running freely.  */
 147 extern int non_stop;
 148
 149 extern void generic_mourn_inferior (void);
 150
 151 extern void terminal_save_ours (void);
 152
 153 extern void terminal_ours (void);
 154
 155 extern CORE_ADDR read_pc (void);
 156
 157 extern void write_pc (CORE_ADDR);
 158
 159 extern CORE_ADDR unsigned_pointer_to_address (struct type *type,
 160                                               const gdb_byte *buf);
 161 extern void unsigned_address_to_pointer (struct type *type, gdb_byte *buf,
 162                                          CORE_ADDR addr);
 163 extern CORE_ADDR signed_pointer_to_address (struct type *type,
 164                                             const gdb_byte *buf);
 165 extern void address_to_signed_pointer (struct type *type, gdb_byte *buf,
 166                                        CORE_ADDR addr);
 167
 168 extern void wait_for_inferior (int treat_exec_as_sigtrap);
 169
 170 extern void fetch_inferior_event (void *);
 171
 172 extern void init_wait_for_inferior (void);
 173
 174 extern void close_exec_file (void);
 175
 176 extern void reopen_exec_file (void);
 177
 178 /* The `resume' routine should only be called in special circumstances.
 179    Normally, use `proceed', which handles a lot of bookkeeping.  */
 180
 181 extern void resume (int, enum target_signal);
 182
 183 /* From misc files */
 184
 185 extern void default_print_registers_info (struct gdbarch *gdbarch,
 186                                           struct ui_file *file,
 187                                           struct frame_info *frame,
 188                                           int regnum, int all);
 189
 190 extern void child_terminal_info (char *, int);
 191
 192 extern void term_info (char *, int);
 193
 194 extern void terminal_ours_for_output (void);
 195
 196 extern void terminal_inferior (void);
 197
 198 extern void terminal_init_inferior (void);
 199
 200 extern void terminal_init_inferior_with_pgrp (int pgrp);
 201
 202 /* From procfs.c */
 203
 204 extern int proc_iterate_over_mappings (int (*)(int, CORE_ADDR));
 205
 206 extern ptid_t procfs_first_available (void);
 207
 208 /* From fork-child.c */
 209
 210 extern void fork_inferior (char *, char *, char **,
 211                            void (*)(void),
 212                            void (*)(int), void (*)(void), char *);
 213
 214
 215 extern void startup_inferior (int);
 216
 217 extern char *construct_inferior_arguments (struct gdbarch *, int, char **);
 218
 219 /* From inflow.c */
 220
 221 extern void new_tty_prefork (const char *);
 222
 223 extern int gdb_has_a_terminal (void);
 224
 225 /* From infrun.c */
 226
 227 extern void start_remote (int from_tty);
 228
 229 extern void normal_stop (void);
 230
 231 extern int signal_stop_state (int);
 232
 233 extern int signal_print_state (int);
 234
 235 extern int signal_pass_state (int);
 236
 237 extern int signal_stop_update (int, int);
 238
 239 extern int signal_print_update (int, int);
 240
 241 extern int signal_pass_update (int, int);
 242
 243 extern void get_last_target_status(ptid_t *ptid,
 244                                    struct target_waitstatus *status);
 245
 246 extern void follow_inferior_reset_breakpoints (void);
 247
 248 /* From infcmd.c */
 249
 250 extern void tty_command (char *, int);
 251
 252 extern void post_create_inferior (struct target_ops *, int);
 253
 254 extern void attach_command (char *, int);
 255
 256 extern char *get_inferior_args (void);
 257
 258 extern char *set_inferior_args (char *);
 259
 260 extern void set_inferior_args_vector (int, char **);
 261
 262 extern void registers_info (char *, int);
 263
 264 extern void nexti_command (char *, int);
 265
 266 extern void stepi_command (char *, int);
 267
 268 extern void continue_command (char *, int);
 269
 270 extern void interrupt_target_command (char *args, int from_tty);
 271
 272 /* Last signal that the inferior received (why it stopped).  */
 273
 274 extern enum target_signal stop_signal;
 275
 276 /* Address at which inferior stopped.  */
 277
 278 extern CORE_ADDR stop_pc;
 279
 280 /* Chain containing status of breakpoint(s) that we have stopped at.  */
 281
 282 extern bpstat stop_bpstat;
 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 a step command.  */
 290
 291 extern int stop_step;
 292
 293 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 294
 295 extern int stop_stack_dummy;
 296
 297 /* Nonzero if program stopped due to a random (unexpected) signal in
 298    inferior process.  */
 299
 300 extern int stopped_by_random_signal;
 301
 302 /* Range to single step within.
 303    If this is nonzero, respond to a single-step signal
 304    by continuing to step if the pc is in this range.
 305
 306    If step_range_start and step_range_end are both 1, it means to step for
 307    a single instruction (FIXME: it might clean up wait_for_inferior in a
 308    minor way if this were changed to the address of the instruction and
 309    that address plus one.  But maybe not.).  */
 310
 311 extern CORE_ADDR step_range_start;      /* Inclusive */
 312 extern CORE_ADDR step_range_end;        /* Exclusive */
 313
 314 /* Stack frame address as of when stepping command was issued.
 315    This is how we know when we step into a subroutine call,
 316    and how to set the frame for the breakpoint used to step out.  */
 317
 318 extern struct frame_id step_frame_id;
 319
 320 /* 1 means step over all subroutine calls.
 321    -1 means step over calls to undebuggable functions.  */
 322
 323 enum step_over_calls_kind
 324   {
 325     STEP_OVER_NONE,
 326     STEP_OVER_ALL,
 327     STEP_OVER_UNDEBUGGABLE
 328   };
 329
 330 extern enum step_over_calls_kind step_over_calls;
 331
 332 /* If stepping, nonzero means step count is > 1
 333    so don't print frame next time inferior stops
 334    if it stops due to stepping.  */
 335
 336 extern int step_multi;
 337
 338 /* Anything but NO_STOP_QUIETLY means we expect a trap and the caller
 339    will handle it themselves.  STOP_QUIETLY is used when running in
 340    the shell before the child program has been exec'd and when running
 341    through shared library loading.  STOP_QUIETLY_REMOTE is used when
 342    setting up a remote connection; it is like STOP_QUIETLY_NO_SIGSTOP
 343    except that there is no need to hide a signal.  */
 344
 345 /* It is also used after attach, due to attaching to a process. This
 346    is a bit trickier.  When doing an attach, the kernel stops the
 347    debuggee with a SIGSTOP.  On newer GNU/Linux kernels (>= 2.5.61)
 348    the handling of SIGSTOP for a ptraced process has changed. Earlier
 349    versions of the kernel would ignore these SIGSTOPs, while now
 350    SIGSTOP is treated like any other signal, i.e. it is not muffled.
 351
 352    If the gdb user does a 'continue' after the 'attach', gdb passes
 353    the global variable stop_signal (which stores the signal from the
 354    attach, SIGSTOP) to the ptrace(PTRACE_CONT,...)  call.  This is
 355    problematic, because the kernel doesn't ignore such SIGSTOP
 356    now. I.e. it is reported back to gdb, which in turn presents it
 357    back to the user.
 358
 359    To avoid the problem, we use STOP_QUIETLY_NO_SIGSTOP, which allows
 360    gdb to clear the value of stop_signal after the attach, so that it
 361    is not passed back down to the kernel.  */
 362
 363 enum stop_kind
 364   {
 365     NO_STOP_QUIETLY = 0,
 366     STOP_QUIETLY,
 367     STOP_QUIETLY_REMOTE,
 368     STOP_QUIETLY_NO_SIGSTOP
 369   };
 370
 371 extern enum stop_kind stop_soon;
 372
 373 /* Nonzero if proceed is being used for a "finish" command or a similar
 374    situation when stop_registers should be saved.  */
 375
 376 extern int proceed_to_finish;
 377
 378 /* Save register contents here when about to pop a stack dummy frame,
 379    if-and-only-if proceed_to_finish is set.
 380    Thus this contains the return value from the called function (assuming
 381    values are returned in a register).  */
 382
 383 extern struct regcache *stop_registers;
 384
 385 /* Nonzero if the child process in inferior_ptid was attached rather
 386    than forked.  */
 387
 388 extern int attach_flag;
 389
 390 /* True if we are debugging displaced stepping.  */
 391 extern int debug_displaced;
 392
 393 /* Dump LEN bytes at BUF in hex to FILE, followed by a newline.  */
 394 void displaced_step_dump_bytes (struct ui_file *file,
 395                                 const gdb_byte *buf, size_t len);
 396
 397
 398 /* When set, normal_stop will not call the normal_stop observer.  */
 399 extern int suppress_stop_observer;
 400
 401 /* When set, no calls to target_resumed observer will be made.  */
 402 extern int suppress_resume_observer;
 403
 404 \f
 405 /* Possible values for gdbarch_call_dummy_location.  */
 406 #define ON_STACK 1
 407 #define AT_ENTRY_POINT 4
 408 #define AT_SYMBOL 5
 409
 410 /* If STARTUP_WITH_SHELL is set, GDB's "run"
 411    will attempts to start up the debugee under a shell.
 412    This is in order for argument-expansion to occur. E.g.,
 413    (gdb) run *
 414    The "*" gets expanded by the shell into a list of files.
 415    While this is a nice feature, it turns out to interact badly
 416    with some of the catch-fork/catch-exec features we have added.
 417    In particular, if the shell does any fork/exec's before
 418    the exec of the target program, that can confuse GDB.
 419    To disable this feature, set STARTUP_WITH_SHELL to 0.
 420    To enable this feature, set STARTUP_WITH_SHELL to 1.
 421    The catch-exec traps expected during start-up will
 422    be 1 if target is not started up with a shell, 2 if it is.
 423    - RT
 424    If you disable this, you need to decrement
 425    START_INFERIOR_TRAPS_EXPECTED in tm.h. */
 426 #define STARTUP_WITH_SHELL 1
 427 #if !defined(START_INFERIOR_TRAPS_EXPECTED)
 428 #define START_INFERIOR_TRAPS_EXPECTED   2
 429 #endif
 430 #endif /* !defined (INFERIOR_H) */