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 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
   5    1996, 1998, 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 59 Temple Place - Suite 330,
  22    Boston, MA 02111-1307, USA.  */
  23
  24 #if !defined (INFERIOR_H)
  25 #define INFERIOR_H 1
  26
  27 struct gdbarch;
  28 struct regcache;
  29
  30 /* For bpstat.  */
  31 #include "breakpoint.h"
  32
  33 /* For enum target_signal.  */
  34 #include "target.h"
  35
  36 /* For struct frame_id.  */
  37 #include "frame.h"
  38
  39 /* Structure in which to save the status of the inferior.  Create/Save
  40    through "save_inferior_status", restore through
  41    "restore_inferior_status".
  42
  43    This pair of routines should be called around any transfer of
  44    control to the inferior which you don't want showing up in your
  45    control variables.  */
  46
  47 struct inferior_status;
  48
  49 extern struct inferior_status *save_inferior_status (int);
  50
  51 extern void restore_inferior_status (struct inferior_status *);
  52
  53 extern struct cleanup *make_cleanup_restore_inferior_status (struct inferior_status *);
  54
  55 extern void discard_inferior_status (struct inferior_status *);
  56
  57 extern void write_inferior_status_register (struct inferior_status
  58                                             *inf_status, int regno,
  59                                             LONGEST val);
  60
  61 /* The -1 ptid, often used to indicate either an error condition
  62    or a "don't care" condition, i.e, "run all threads."  */
  63 extern ptid_t minus_one_ptid;
  64
  65 /* The null or zero ptid, often used to indicate no process. */
  66 extern ptid_t null_ptid;
  67
  68 /* Attempt to find and return an existing ptid with the given PID, LWP,
  69    and TID components.  If none exists, create a new one and return
  70    that.  */
  71 ptid_t ptid_build (int pid, long lwp, long tid);
  72
  73 /* Find/Create a ptid from just a pid. */
  74 ptid_t pid_to_ptid (int pid);
  75
  76 /* Fetch the pid (process id) component from a ptid. */
  77 int ptid_get_pid (ptid_t ptid);
  78
  79 /* Fetch the lwp (lightweight process) component from a ptid. */
  80 long ptid_get_lwp (ptid_t ptid);
  81
  82 /* Fetch the tid (thread id) component from a ptid. */
  83 long ptid_get_tid (ptid_t ptid);
  84
  85 /* Compare two ptids to see if they are equal */
  86 extern int ptid_equal (ptid_t p1, ptid_t p2);
  87
  88 /* Save value of inferior_ptid so that it may be restored by
  89    a later call to do_cleanups().  Returns the struct cleanup
  90    pointer needed for later doing the cleanup.  */
  91 extern struct cleanup * save_inferior_ptid (void);
  92
  93 extern void set_sigint_trap (void);
  94
  95 extern void clear_sigint_trap (void);
  96
  97 extern void set_sigio_trap (void);
  98
  99 extern void clear_sigio_trap (void);
 100
 101 /* File name for default use for standard in/out in the inferior.  */
 102
 103 extern char *inferior_io_terminal;
 104
 105 /* Collected pid, tid, etc. of the debugged inferior.  When there's
 106    no inferior, PIDGET (inferior_ptid) will be 0. */
 107
 108 extern ptid_t inferior_ptid;
 109
 110 /* Is the inferior running right now, as a result of a 'run&',
 111    'continue&' etc command? This is used in asycn gdb to determine
 112    whether a command that the user enters while the target is running
 113    is allowed or not. */
 114 extern int target_executing;
 115
 116 /* Are we simulating synchronous execution? This is used in async gdb
 117    to implement the 'run', 'continue' etc commands, which will not
 118    redisplay the prompt until the execution is actually over. */
 119 extern int sync_execution;
 120
 121 /* This is only valid when inferior_ptid is non-zero.
 122
 123    If this is 0, then exec events should be noticed and responded to
 124    by the debugger (i.e., be reported to the user).
 125
 126    If this is > 0, then that many subsequent exec events should be
 127    ignored (i.e., not be reported to the user).
 128  */
 129 extern int inferior_ignoring_startup_exec_events;
 130
 131 /* This is only valid when inferior_ignoring_startup_exec_events is
 132    zero.
 133
 134    Some targets (stupidly) report more than one exec event per actual
 135    call to an event() system call.  If only the last such exec event
 136    need actually be noticed and responded to by the debugger (i.e.,
 137    be reported to the user), then this is the number of "leading"
 138    exec events which should be ignored.
 139  */
 140 extern int inferior_ignoring_leading_exec_events;
 141
 142 /* Inferior environment. */
 143
 144 extern struct environ *inferior_environ;
 145
 146 extern void clear_proceed_status (void);
 147
 148 extern void proceed (CORE_ADDR, enum target_signal, int);
 149
 150 /* When set, stop the 'step' command if we enter a function which has
 151    no line number information.  The normal behavior is that we step
 152    over such function.  */
 153 extern int step_stop_if_no_debug;
 154
 155 extern void kill_inferior (void);
 156
 157 extern void generic_mourn_inferior (void);
 158
 159 extern void terminal_save_ours (void);
 160
 161 extern void terminal_ours (void);
 162
 163 extern int run_stack_dummy (CORE_ADDR , struct regcache *);
 164
 165 extern CORE_ADDR read_pc (void);
 166
 167 extern CORE_ADDR read_pc_pid (ptid_t);
 168
 169 extern CORE_ADDR generic_target_read_pc (ptid_t);
 170
 171 extern void write_pc (CORE_ADDR);
 172
 173 extern void write_pc_pid (CORE_ADDR, ptid_t);
 174
 175 extern void generic_target_write_pc (CORE_ADDR, ptid_t);
 176
 177 extern CORE_ADDR read_sp (void);
 178
 179 extern CORE_ADDR generic_target_read_sp (void);
 180
 181 extern void write_sp (CORE_ADDR);
 182
 183 extern void generic_target_write_sp (CORE_ADDR);
 184
 185 extern CORE_ADDR read_fp (void);
 186
 187 extern CORE_ADDR generic_target_read_fp (void);
 188
 189 extern CORE_ADDR unsigned_pointer_to_address (struct type *type, const void *buf);
 190
 191 extern void unsigned_address_to_pointer (struct type *type, void *buf,
 192                                          CORE_ADDR addr);
 193 extern CORE_ADDR signed_pointer_to_address (struct type *type,
 194                                             const void *buf);
 195 extern void address_to_signed_pointer (struct type *type, void *buf,
 196                                        CORE_ADDR addr);
 197
 198 extern void wait_for_inferior (void);
 199
 200 extern void fetch_inferior_event (void *);
 201
 202 extern void init_wait_for_inferior (void);
 203
 204 extern void close_exec_file (void);
 205
 206 extern void reopen_exec_file (void);
 207
 208 /* The `resume' routine should only be called in special circumstances.
 209    Normally, use `proceed', which handles a lot of bookkeeping.  */
 210
 211 extern void resume (int, enum target_signal);
 212
 213 /* From misc files */
 214
 215 extern void default_print_registers_info (struct gdbarch *gdbarch,
 216                                           struct ui_file *file,
 217                                           struct frame_info *frame,
 218                                           int regnum, int all);
 219
 220 extern void store_inferior_registers (int);
 221
 222 extern void fetch_inferior_registers (int);
 223
 224 extern void solib_create_inferior_hook (void);
 225
 226 extern void child_terminal_info (char *, int);
 227
 228 extern void term_info (char *, int);
 229
 230 extern void terminal_ours_for_output (void);
 231
 232 extern void terminal_inferior (void);
 233
 234 extern void terminal_init_inferior (void);
 235
 236 extern void terminal_init_inferior_with_pgrp (int pgrp);
 237
 238 /* From infptrace.c or infttrace.c */
 239
 240 extern int attach (int);
 241
 242 extern void detach (int);
 243
 244 /* PTRACE method of waiting for inferior process.  */
 245 int ptrace_wait (ptid_t, int *);
 246
 247 extern void child_resume (ptid_t, int, enum target_signal);
 248
 249 #ifndef PTRACE_ARG3_TYPE
 250 #define PTRACE_ARG3_TYPE int    /* Correct definition for most systems. */
 251 #endif
 252
 253 extern int call_ptrace (int, int, PTRACE_ARG3_TYPE, int);
 254
 255 extern void pre_fork_inferior (void);
 256
 257 /* From procfs.c */
 258
 259 extern int proc_iterate_over_mappings (int (*)(int, CORE_ADDR));
 260
 261 extern ptid_t procfs_first_available (void);
 262
 263 /* From fork-child.c */
 264
 265 extern void fork_inferior (char *, char *, char **,
 266                            void (*)(void),
 267                            void (*)(int), void (*)(void), char *);
 268
 269
 270 extern void startup_inferior (int);
 271
 272 extern char *construct_inferior_arguments (struct gdbarch *, int, char **);
 273
 274 /* From inflow.c */
 275
 276 extern void new_tty_prefork (char *);
 277
 278 extern int gdb_has_a_terminal (void);
 279
 280 /* From infrun.c */
 281
 282 extern void start_remote (void);
 283
 284 extern void normal_stop (void);
 285
 286 extern int signal_stop_state (int);
 287
 288 extern int signal_print_state (int);
 289
 290 extern int signal_pass_state (int);
 291
 292 extern int signal_stop_update (int, int);
 293
 294 extern int signal_print_update (int, int);
 295
 296 extern int signal_pass_update (int, int);
 297
 298 extern void get_last_target_status(ptid_t *ptid,
 299                                    struct target_waitstatus *status);
 300
 301 extern void follow_inferior_reset_breakpoints (void);
 302
 303 /* From infcmd.c */
 304
 305 extern void tty_command (char *, int);
 306
 307 extern void attach_command (char *, int);
 308
 309 extern char *get_inferior_args (void);
 310
 311 extern char *set_inferior_args (char *);
 312
 313 extern void set_inferior_args_vector (int, char **);
 314
 315 extern void registers_info (char *, int);
 316
 317 extern void nexti_command (char *, int);
 318
 319 extern void stepi_command (char *, int);
 320
 321 extern void continue_command (char *, int);
 322
 323 extern void interrupt_target_command (char *args, int from_tty);
 324
 325 /* Last signal that the inferior received (why it stopped).  */
 326
 327 extern enum target_signal stop_signal;
 328
 329 /* Address at which inferior stopped.  */
 330
 331 extern CORE_ADDR stop_pc;
 332
 333 /* Chain containing status of breakpoint(s) that we have stopped at.  */
 334
 335 extern bpstat stop_bpstat;
 336
 337 /* Flag indicating that a command has proceeded the inferior past the
 338    current breakpoint.  */
 339
 340 extern int breakpoint_proceeded;
 341
 342 /* Nonzero if stopped due to a step command.  */
 343
 344 extern int stop_step;
 345
 346 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 347
 348 extern int stop_stack_dummy;
 349
 350 /* Nonzero if program stopped due to a random (unexpected) signal in
 351    inferior process.  */
 352
 353 extern int stopped_by_random_signal;
 354
 355 /* Range to single step within.
 356    If this is nonzero, respond to a single-step signal
 357    by continuing to step if the pc is in this range.
 358
 359    If step_range_start and step_range_end are both 1, it means to step for
 360    a single instruction (FIXME: it might clean up wait_for_inferior in a
 361    minor way if this were changed to the address of the instruction and
 362    that address plus one.  But maybe not.).  */
 363
 364 extern CORE_ADDR step_range_start;      /* Inclusive */
 365 extern CORE_ADDR step_range_end;        /* Exclusive */
 366
 367 /* Stack frame address as of when stepping command was issued.
 368    This is how we know when we step into a subroutine call,
 369    and how to set the frame for the breakpoint used to step out.  */
 370
 371 extern struct frame_id step_frame_id;
 372
 373 /* Our notion of the current stack pointer.  */
 374
 375 extern CORE_ADDR step_sp;
 376
 377 /* 1 means step over all subroutine calls.
 378    -1 means step over calls to undebuggable functions.  */
 379
 380 enum step_over_calls_kind
 381   {
 382     STEP_OVER_NONE,
 383     STEP_OVER_ALL,
 384     STEP_OVER_UNDEBUGGABLE
 385   };
 386
 387 extern enum step_over_calls_kind step_over_calls;
 388
 389 /* If stepping, nonzero means step count is > 1
 390    so don't print frame next time inferior stops
 391    if it stops due to stepping.  */
 392
 393 extern int step_multi;
 394
 395 /* Nonzero means expecting a trap and caller will handle it themselves.
 396    It is used after attach, due to attaching to a process;
 397    when running in the shell before the child program has been exec'd;
 398    and when running some kinds of remote stuff (FIXME?).  */
 399
 400 extern int stop_soon_quietly;
 401
 402 /* Nonzero if proceed is being used for a "finish" command or a similar
 403    situation when stop_registers should be saved.  */
 404
 405 extern int proceed_to_finish;
 406
 407 /* Save register contents here when about to pop a stack dummy frame,
 408    if-and-only-if proceed_to_finish is set.
 409    Thus this contains the return value from the called function (assuming
 410    values are returned in a register).  */
 411
 412 extern struct regcache *stop_registers;
 413
 414 /* Nonzero if the child process in inferior_ptid was attached rather
 415    than forked.  */
 416
 417 extern int attach_flag;
 418 \f
 419 /* Possible values for CALL_DUMMY_LOCATION.  */
 420 #define ON_STACK 1
 421 #define AT_ENTRY_POINT 4
 422
 423 #if !defined (CALL_DUMMY_ADDRESS)
 424 #define CALL_DUMMY_ADDRESS() (internal_error (__FILE__, __LINE__, "CALL_DUMMY_ADDRESS"), 0)
 425 #endif
 426 #if !defined (CALL_DUMMY_START_OFFSET)
 427 #define CALL_DUMMY_START_OFFSET (internal_error (__FILE__, __LINE__, "CALL_DUMMY_START_OFFSET"), 0)
 428 #endif
 429 #if !defined (CALL_DUMMY_BREAKPOINT_OFFSET)
 430 #define CALL_DUMMY_BREAKPOINT_OFFSET_P (0)
 431 #define CALL_DUMMY_BREAKPOINT_OFFSET (internal_error (__FILE__, __LINE__, "CALL_DUMMY_BREAKPOINT_OFFSET"), 0)
 432 #endif
 433 #if !defined CALL_DUMMY_BREAKPOINT_OFFSET_P
 434 #define CALL_DUMMY_BREAKPOINT_OFFSET_P (1)
 435 #endif
 436 #if !defined (CALL_DUMMY_LENGTH)
 437 #define CALL_DUMMY_LENGTH (internal_error (__FILE__, __LINE__, "CALL_DUMMY_LENGTH"), 0)
 438 #endif
 439
 440 /* FIXME: cagney/2000-04-17: gdbarch should manage this.  The default
 441    shouldn't be necessary. */
 442
 443 #if !defined (CALL_DUMMY_P)
 444 #if defined (CALL_DUMMY)
 445 #define CALL_DUMMY_P 1
 446 #else
 447 #define CALL_DUMMY_P 0
 448 #endif
 449 #endif
 450
 451 #if !defined PUSH_DUMMY_FRAME
 452 #define PUSH_DUMMY_FRAME (internal_error (__FILE__, __LINE__, "PUSH_DUMMY_FRAME"), 0)
 453 #endif
 454
 455 #if !defined FIX_CALL_DUMMY
 456 #define FIX_CALL_DUMMY(a1,a2,a3,a4,a5,a6,a7) (internal_error (__FILE__, __LINE__, "FIX_CALL_DUMMY"), 0)
 457 #endif
 458
 459 #if !defined STORE_STRUCT_RETURN
 460 #define STORE_STRUCT_RETURN(a1,a2) (internal_error (__FILE__, __LINE__, "STORE_STRUCT_RETURN"), 0)
 461 #endif
 462
 463
 464 /* Are we in a call dummy? */
 465
 466 /* NOTE: cagney/2002-11-24: Targets need to both switch to generic
 467    dummy frames, and use generic_pc_in_call_dummy().  The generic
 468    version should be able to handle all cases since that code works by
 469    saving the address of the dummy's breakpoint (where ever it is).  */
 470
 471 extern int deprecated_pc_in_call_dummy_on_stack (CORE_ADDR pc,
 472                                                  CORE_ADDR sp,
 473                                                  CORE_ADDR frame_address);
 474
 475 /* NOTE: cagney/2002-11-24: Targets need to both switch to generic
 476    dummy frames, and use generic_pc_in_call_dummy().  The generic
 477    version should be able to handle all cases since that code works by
 478    saving the address of the dummy's breakpoint (where ever it is).  */
 479
 480 extern int deprecated_pc_in_call_dummy_at_entry_point (CORE_ADDR pc,
 481                                                        CORE_ADDR sp,
 482                                                        CORE_ADDR frame_address);
 483
 484 /* It's often not enough for our clients to know whether the PC is merely
 485    somewhere within the call dummy.  They may need to know whether the
 486    call dummy has actually completed.  (For example, wait_for_inferior
 487    wants to know when it should truly stop because the call dummy has
 488    completed.  If we're single-stepping because of slow watchpoints,
 489    then we may find ourselves stopped at the entry of the call dummy,
 490    and want to continue stepping until we reach the end.)
 491
 492    Note that this macro is intended for targets (like HP-UX) which
 493    require more than a single breakpoint in their call dummies, and
 494    therefore cannot use the CALL_DUMMY_BREAKPOINT_OFFSET mechanism.
 495
 496    If a target does define CALL_DUMMY_BREAKPOINT_OFFSET, then this
 497    default implementation of CALL_DUMMY_HAS_COMPLETED is sufficient.
 498    Else, a target may wish to supply an implementation that works in
 499    the presense of multiple breakpoints in its call dummy.
 500  */
 501 #if !defined(CALL_DUMMY_HAS_COMPLETED)
 502 #define CALL_DUMMY_HAS_COMPLETED(pc, sp, frame_address) \
 503   DEPRECATED_PC_IN_CALL_DUMMY((pc), (sp), (frame_address))
 504 #endif
 505
 506 /* If STARTUP_WITH_SHELL is set, GDB's "run"
 507    will attempts to start up the debugee under a shell.
 508    This is in order for argument-expansion to occur. E.g.,
 509    (gdb) run *
 510    The "*" gets expanded by the shell into a list of files.
 511    While this is a nice feature, it turns out to interact badly
 512    with some of the catch-fork/catch-exec features we have added.
 513    In particular, if the shell does any fork/exec's before
 514    the exec of the target program, that can confuse GDB.
 515    To disable this feature, set STARTUP_WITH_SHELL to 0.
 516    To enable this feature, set STARTUP_WITH_SHELL to 1.
 517    The catch-exec traps expected during start-up will
 518    be 1 if target is not started up with a shell, 2 if it is.
 519    - RT
 520    If you disable this, you need to decrement
 521    START_INFERIOR_TRAPS_EXPECTED in tm.h. */
 522 #define STARTUP_WITH_SHELL 1
 523 #if !defined(START_INFERIOR_TRAPS_EXPECTED)
 524 #define START_INFERIOR_TRAPS_EXPECTED   2
 525 #endif
 526 #endif /* !defined (INFERIOR_H) */