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    Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
   4    1998, 1999, 2000, 2001 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 2 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, write to the Free Software
  20    Foundation, Inc., 59 Temple Place - Suite 330,
  21    Boston, MA 02111-1307, USA.  */
  22
  23 #if !defined (INFERIOR_H)
  24 #define INFERIOR_H 1
  25
  26 /* For bpstat.  */
  27 #include "breakpoint.h"
  28
  29 /* For enum target_signal.  */
  30 #include "target.h"
  31
  32 /* Structure in which to save the status of the inferior.  Create/Save
  33    through "save_inferior_status", restore through
  34    "restore_inferior_status".
  35
  36    This pair of routines should be called around any transfer of
  37    control to the inferior which you don't want showing up in your
  38    control variables.  */
  39
  40 struct inferior_status;
  41
  42 extern struct inferior_status *save_inferior_status (int);
  43
  44 extern void restore_inferior_status (struct inferior_status *);
  45
  46 extern struct cleanup *make_cleanup_restore_inferior_status (struct inferior_status *);
  47
  48 extern void discard_inferior_status (struct inferior_status *);
  49
  50 extern void write_inferior_status_register (struct inferior_status
  51                                             *inf_status, int regno,
  52                                             LONGEST val);
  53
  54 extern void set_sigint_trap (void);
  55
  56 extern void clear_sigint_trap (void);
  57
  58 extern void set_sigio_trap (void);
  59
  60 extern void clear_sigio_trap (void);
  61
  62 /* File name for default use for standard in/out in the inferior.  */
  63
  64 extern char *inferior_io_terminal;
  65
  66 /* Collected pid, tid, etc. of the debugged inferior.  When there's
  67    no inferior, PIDGET (inferior_ptid) will be 0. */
  68
  69 extern ptid_t inferior_ptid;
  70
  71 /* Is the inferior running right now, as a result of a 'run&',
  72    'continue&' etc command? This is used in asycn gdb to determine
  73    whether a command that the user enters while the target is running
  74    is allowed or not. */
  75 extern int target_executing;
  76
  77 /* Are we simulating synchronous execution? This is used in async gdb
  78    to implement the 'run', 'continue' etc commands, which will not
  79    redisplay the prompt until the execution is actually over. */
  80 extern int sync_execution;
  81
  82 /* This is only valid when inferior_ptid is non-zero.
  83
  84    If this is 0, then exec events should be noticed and responded to
  85    by the debugger (i.e., be reported to the user).
  86
  87    If this is > 0, then that many subsequent exec events should be
  88    ignored (i.e., not be reported to the user).
  89  */
  90 extern int inferior_ignoring_startup_exec_events;
  91
  92 /* This is only valid when inferior_ignoring_startup_exec_events is
  93    zero.
  94
  95    Some targets (stupidly) report more than one exec event per actual
  96    call to an event() system call.  If only the last such exec event
  97    need actually be noticed and responded to by the debugger (i.e.,
  98    be reported to the user), then this is the number of "leading"
  99    exec events which should be ignored.
 100  */
 101 extern int inferior_ignoring_leading_exec_events;
 102
 103 /* Inferior environment. */
 104
 105 extern struct environ *inferior_environ;
 106
 107 extern void clear_proceed_status (void);
 108
 109 extern void proceed (CORE_ADDR, enum target_signal, int);
 110
 111 /* When set, stop the 'step' command if we enter a function which has
 112    no line number information.  The normal behavior is that we step
 113    over such function.  */
 114 extern int step_stop_if_no_debug;
 115
 116 extern void kill_inferior (void);
 117
 118 extern void generic_mourn_inferior (void);
 119
 120 extern void terminal_ours (void);
 121
 122 extern int run_stack_dummy (CORE_ADDR, char *);
 123
 124 extern CORE_ADDR read_pc (void);
 125
 126 extern CORE_ADDR read_pc_pid (ptid_t);
 127
 128 extern CORE_ADDR generic_target_read_pc (ptid_t);
 129
 130 extern void write_pc (CORE_ADDR);
 131
 132 extern void write_pc_pid (CORE_ADDR, ptid_t);
 133
 134 extern void generic_target_write_pc (CORE_ADDR, ptid_t);
 135
 136 extern CORE_ADDR read_sp (void);
 137
 138 extern CORE_ADDR generic_target_read_sp (void);
 139
 140 extern void write_sp (CORE_ADDR);
 141
 142 extern void generic_target_write_sp (CORE_ADDR);
 143
 144 extern CORE_ADDR read_fp (void);
 145
 146 extern CORE_ADDR generic_target_read_fp (void);
 147
 148 extern void write_fp (CORE_ADDR);
 149
 150 extern void generic_target_write_fp (CORE_ADDR);
 151
 152 extern CORE_ADDR unsigned_pointer_to_address (struct type *type, void *buf);
 153
 154 extern void unsigned_address_to_pointer (struct type *type, void *buf,
 155                                          CORE_ADDR addr);
 156 extern CORE_ADDR signed_pointer_to_address (struct type *type, void *buf);
 157 extern void address_to_signed_pointer (struct type *type, void *buf,
 158                                        CORE_ADDR addr);
 159
 160 extern void wait_for_inferior (void);
 161
 162 extern void fetch_inferior_event (void *);
 163
 164 extern void init_wait_for_inferior (void);
 165
 166 extern void close_exec_file (void);
 167
 168 extern void reopen_exec_file (void);
 169
 170 /* The `resume' routine should only be called in special circumstances.
 171    Normally, use `proceed', which handles a lot of bookkeeping.  */
 172
 173 extern void resume (int, enum target_signal);
 174
 175 /* From misc files */
 176
 177 extern void do_registers_info (int, int);
 178
 179 extern void store_inferior_registers (int);
 180
 181 extern void fetch_inferior_registers (int);
 182
 183 extern void solib_create_inferior_hook (void);
 184
 185 extern void child_terminal_info (char *, int);
 186
 187 extern void term_info (char *, int);
 188
 189 extern void terminal_ours_for_output (void);
 190
 191 extern void terminal_inferior (void);
 192
 193 extern void terminal_init_inferior (void);
 194
 195 extern void terminal_init_inferior_with_pgrp (int pgrp);
 196
 197 /* From infptrace.c or infttrace.c */
 198
 199 extern int attach (int);
 200
 201 #if !defined(REQUIRE_ATTACH)
 202 #define REQUIRE_ATTACH attach
 203 #endif
 204
 205 #if !defined(REQUIRE_DETACH)
 206 #define REQUIRE_DETACH(pid,siggnal) detach (siggnal)
 207 #endif
 208
 209 extern void detach (int);
 210
 211 /* PTRACE method of waiting for inferior process.  */
 212 int ptrace_wait (ptid_t, int *);
 213
 214 extern void child_resume (ptid_t, int, enum target_signal);
 215
 216 #ifndef PTRACE_ARG3_TYPE
 217 #define PTRACE_ARG3_TYPE int    /* Correct definition for most systems. */
 218 #endif
 219
 220 extern int call_ptrace (int, int, PTRACE_ARG3_TYPE, int);
 221
 222 extern void pre_fork_inferior (void);
 223
 224 /* From procfs.c */
 225
 226 extern int proc_iterate_over_mappings (int (*)(int, CORE_ADDR));
 227
 228 extern ptid_t procfs_first_available (void);
 229
 230 /* From fork-child.c */
 231
 232 extern void fork_inferior (char *, char *, char **,
 233                            void (*)(void),
 234                            void (*)(int), void (*)(void), char *);
 235
 236
 237 extern void clone_and_follow_inferior (int, int *);
 238
 239 extern void startup_inferior (int);
 240
 241 /* From inflow.c */
 242
 243 extern void new_tty_prefork (char *);
 244
 245 extern int gdb_has_a_terminal (void);
 246
 247 /* From infrun.c */
 248
 249 extern void start_remote (void);
 250
 251 extern void normal_stop (void);
 252
 253 extern int signal_stop_state (int);
 254
 255 extern int signal_print_state (int);
 256
 257 extern int signal_pass_state (int);
 258
 259 extern int signal_stop_update (int, int);
 260
 261 extern int signal_print_update (int, int);
 262
 263 extern int signal_pass_update (int, int);
 264
 265 extern void get_last_target_status(ptid_t *ptid,
 266                                    struct target_waitstatus *status);
 267
 268 /* From infcmd.c */
 269
 270 extern void tty_command (char *, int);
 271
 272 extern void attach_command (char *, int);
 273
 274 extern char *get_inferior_args (void);
 275
 276 extern char *set_inferior_args (char *);
 277
 278 /* Last signal that the inferior received (why it stopped).  */
 279
 280 extern enum target_signal stop_signal;
 281
 282 /* Address at which inferior stopped.  */
 283
 284 extern CORE_ADDR stop_pc;
 285
 286 /* Chain containing status of breakpoint(s) that we have stopped at.  */
 287
 288 extern bpstat stop_bpstat;
 289
 290 /* Flag indicating that a command has proceeded the inferior past the
 291    current breakpoint.  */
 292
 293 extern int breakpoint_proceeded;
 294
 295 /* Nonzero if stopped due to a step command.  */
 296
 297 extern int stop_step;
 298
 299 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 300
 301 extern int stop_stack_dummy;
 302
 303 /* Nonzero if program stopped due to a random (unexpected) signal in
 304    inferior process.  */
 305
 306 extern int stopped_by_random_signal;
 307
 308 /* Range to single step within.
 309    If this is nonzero, respond to a single-step signal
 310    by continuing to step if the pc is in this range.
 311
 312    If step_range_start and step_range_end are both 1, it means to step for
 313    a single instruction (FIXME: it might clean up wait_for_inferior in a
 314    minor way if this were changed to the address of the instruction and
 315    that address plus one.  But maybe not.).  */
 316
 317 extern CORE_ADDR step_range_start;      /* Inclusive */
 318 extern CORE_ADDR step_range_end;        /* Exclusive */
 319
 320 /* Stack frame address as of when stepping command was issued.
 321    This is how we know when we step into a subroutine call,
 322    and how to set the frame for the breakpoint used to step out.  */
 323
 324 extern CORE_ADDR step_frame_address;
 325
 326 /* Our notion of the current stack pointer.  */
 327
 328 extern CORE_ADDR step_sp;
 329
 330 /* 1 means step over all subroutine calls.
 331    -1 means step over calls to undebuggable functions.  */
 332
 333 enum step_over_calls_kind
 334   {
 335     STEP_OVER_NONE,
 336     STEP_OVER_ALL,
 337     STEP_OVER_UNDEBUGGABLE
 338   };
 339
 340 extern enum step_over_calls_kind step_over_calls;
 341
 342 /* If stepping, nonzero means step count is > 1
 343    so don't print frame next time inferior stops
 344    if it stops due to stepping.  */
 345
 346 extern int step_multi;
 347
 348 /* Nonzero means expecting a trap and caller will handle it themselves.
 349    It is used after attach, due to attaching to a process;
 350    when running in the shell before the child program has been exec'd;
 351    and when running some kinds of remote stuff (FIXME?).  */
 352
 353 extern int stop_soon_quietly;
 354
 355 /* Nonzero if proceed is being used for a "finish" command or a similar
 356    situation when stop_registers should be saved.  */
 357
 358 extern int proceed_to_finish;
 359
 360 /* Save register contents here when about to pop a stack dummy frame,
 361    if-and-only-if proceed_to_finish is set.
 362    Thus this contains the return value from the called function (assuming
 363    values are returned in a register).  */
 364
 365 extern char *stop_registers;
 366
 367 /* Nonzero if the child process in inferior_ptid was attached rather
 368    than forked.  */
 369
 370 extern int attach_flag;
 371 \f
 372 /* Sigtramp is a routine that the kernel calls (which then calls the
 373    signal handler).  On most machines it is a library routine that
 374    is linked into the executable.
 375
 376    This macro, given a program counter value and the name of the
 377    function in which that PC resides (which can be null if the
 378    name is not known), returns nonzero if the PC and name show
 379    that we are in sigtramp.
 380
 381    On most machines just see if the name is sigtramp (and if we have
 382    no name, assume we are not in sigtramp).  */
 383 #if !defined (IN_SIGTRAMP)
 384 #if defined (SIGTRAMP_START)
 385 #define IN_SIGTRAMP(pc, name) \
 386        ((pc) >= SIGTRAMP_START(pc)   \
 387         && (pc) < SIGTRAMP_END(pc) \
 388         )
 389 #else
 390 #define IN_SIGTRAMP(pc, name) \
 391        (name && STREQ ("_sigtramp", name))
 392 #endif
 393 #endif
 394 \f
 395 /* Possible values for CALL_DUMMY_LOCATION.  */
 396 #define ON_STACK 1
 397 #define BEFORE_TEXT_END 2
 398 #define AFTER_TEXT_END 3
 399 #define AT_ENTRY_POINT 4
 400
 401 #if !defined (USE_GENERIC_DUMMY_FRAMES)
 402 #define USE_GENERIC_DUMMY_FRAMES 0
 403 #endif
 404
 405 #if !defined (CALL_DUMMY_LOCATION)
 406 #define CALL_DUMMY_LOCATION ON_STACK
 407 #endif /* No CALL_DUMMY_LOCATION.  */
 408
 409 #if !defined (CALL_DUMMY_ADDRESS)
 410 #define CALL_DUMMY_ADDRESS() (internal_error (__FILE__, __LINE__, "CALL_DUMMY_ADDRESS"), 0)
 411 #endif
 412 #if !defined (CALL_DUMMY_START_OFFSET)
 413 #define CALL_DUMMY_START_OFFSET (internal_error (__FILE__, __LINE__, "CALL_DUMMY_START_OFFSET"), 0)
 414 #endif
 415 #if !defined (CALL_DUMMY_BREAKPOINT_OFFSET)
 416 #define CALL_DUMMY_BREAKPOINT_OFFSET_P (0)
 417 #define CALL_DUMMY_BREAKPOINT_OFFSET (internal_error (__FILE__, __LINE__, "CALL_DUMMY_BREAKPOINT_OFFSET"), 0)
 418 #endif
 419 #if !defined CALL_DUMMY_BREAKPOINT_OFFSET_P
 420 #define CALL_DUMMY_BREAKPOINT_OFFSET_P (1)
 421 #endif
 422 #if !defined (CALL_DUMMY_LENGTH)
 423 #define CALL_DUMMY_LENGTH (internal_error (__FILE__, __LINE__, "CALL_DUMMY_LENGTH"), 0)
 424 #endif
 425
 426 #if defined (CALL_DUMMY_STACK_ADJUST)
 427 #if !defined (CALL_DUMMY_STACK_ADJUST_P)
 428 #define CALL_DUMMY_STACK_ADJUST_P (1)
 429 #endif
 430 #endif
 431 #if !defined (CALL_DUMMY_STACK_ADJUST)
 432 #define CALL_DUMMY_STACK_ADJUST (internal_error (__FILE__, __LINE__, "CALL_DUMMY_STACK_ADJUST"), 0)
 433 #endif
 434 #if !defined (CALL_DUMMY_STACK_ADJUST_P)
 435 #define CALL_DUMMY_STACK_ADJUST_P (0)
 436 #endif
 437
 438 /* FIXME: cagney/2000-04-17: gdbarch should manage this.  The default
 439    shouldn't be necessary. */
 440
 441 #if !defined (CALL_DUMMY_P)
 442 #if defined (CALL_DUMMY)
 443 #define CALL_DUMMY_P 1
 444 #else
 445 #define CALL_DUMMY_P 0
 446 #endif
 447 #endif
 448
 449 #if !defined PUSH_DUMMY_FRAME
 450 #define PUSH_DUMMY_FRAME (internal_error (__FILE__, __LINE__, "PUSH_DUMMY_FRAME"), 0)
 451 #endif
 452
 453 #if !defined FIX_CALL_DUMMY
 454 #define FIX_CALL_DUMMY(a1,a2,a3,a4,a5,a6,a7) (internal_error (__FILE__, __LINE__, "FIX_CALL_DUMMY"), 0)
 455 #endif
 456
 457 #if !defined STORE_STRUCT_RETURN
 458 #define STORE_STRUCT_RETURN(a1,a2) (internal_error (__FILE__, __LINE__, "STORE_STRUCT_RETURN"), 0)
 459 #endif
 460
 461
 462 /* Are we in a call dummy? */
 463
 464 extern int pc_in_call_dummy_before_text_end (CORE_ADDR pc, CORE_ADDR sp,
 465                                              CORE_ADDR frame_address);
 466 #if !GDB_MULTI_ARCH
 467 #if !defined (PC_IN_CALL_DUMMY) && CALL_DUMMY_LOCATION == BEFORE_TEXT_END
 468 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) pc_in_call_dummy_before_text_end (pc, sp, frame_address)
 469 #endif /* Before text_end.  */
 470 #endif
 471
 472 extern int pc_in_call_dummy_after_text_end (CORE_ADDR pc, CORE_ADDR sp,
 473                                             CORE_ADDR frame_address);
 474 #if !GDB_MULTI_ARCH
 475 #if !defined (PC_IN_CALL_DUMMY) && CALL_DUMMY_LOCATION == AFTER_TEXT_END
 476 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) pc_in_call_dummy_after_text_end (pc, sp, frame_address)
 477 #endif
 478 #endif
 479
 480 extern int pc_in_call_dummy_on_stack (CORE_ADDR pc, CORE_ADDR sp,
 481                                       CORE_ADDR frame_address);
 482 #if !GDB_MULTI_ARCH
 483 #if !defined (PC_IN_CALL_DUMMY) && CALL_DUMMY_LOCATION == ON_STACK
 484 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) pc_in_call_dummy_on_stack (pc, sp, frame_address)
 485 #endif
 486 #endif
 487
 488 extern int pc_in_call_dummy_at_entry_point (CORE_ADDR pc, CORE_ADDR sp,
 489                                             CORE_ADDR frame_address);
 490 #if !GDB_MULTI_ARCH
 491 #if !defined (PC_IN_CALL_DUMMY) && CALL_DUMMY_LOCATION == AT_ENTRY_POINT
 492 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) pc_in_call_dummy_at_entry_point (pc, sp, frame_address)
 493 #endif
 494 #endif
 495
 496 /* It's often not enough for our clients to know whether the PC is merely
 497    somewhere within the call dummy.  They may need to know whether the
 498    call dummy has actually completed.  (For example, wait_for_inferior
 499    wants to know when it should truly stop because the call dummy has
 500    completed.  If we're single-stepping because of slow watchpoints,
 501    then we may find ourselves stopped at the entry of the call dummy,
 502    and want to continue stepping until we reach the end.)
 503
 504    Note that this macro is intended for targets (like HP-UX) which
 505    require more than a single breakpoint in their call dummies, and
 506    therefore cannot use the CALL_DUMMY_BREAKPOINT_OFFSET mechanism.
 507
 508    If a target does define CALL_DUMMY_BREAKPOINT_OFFSET, then this
 509    default implementation of CALL_DUMMY_HAS_COMPLETED is sufficient.
 510    Else, a target may wish to supply an implementation that works in
 511    the presense of multiple breakpoints in its call dummy.
 512  */
 513 #if !defined(CALL_DUMMY_HAS_COMPLETED)
 514 #define CALL_DUMMY_HAS_COMPLETED(pc, sp, frame_address) \
 515   PC_IN_CALL_DUMMY((pc), (sp), (frame_address))
 516 #endif
 517
 518 /* If STARTUP_WITH_SHELL is set, GDB's "run"
 519    will attempts to start up the debugee under a shell.
 520    This is in order for argument-expansion to occur. E.g.,
 521    (gdb) run *
 522    The "*" gets expanded by the shell into a list of files.
 523    While this is a nice feature, it turns out to interact badly
 524    with some of the catch-fork/catch-exec features we have added.
 525    In particular, if the shell does any fork/exec's before
 526    the exec of the target program, that can confuse GDB.
 527    To disable this feature, set STARTUP_WITH_SHELL to 0.
 528    To enable this feature, set STARTUP_WITH_SHELL to 1.
 529    The catch-exec traps expected during start-up will
 530    be 1 if target is not started up with a shell, 2 if it is.
 531    - RT
 532    If you disable this, you need to decrement
 533    START_INFERIOR_TRAPS_EXPECTED in tm.h. */
 534 #define STARTUP_WITH_SHELL 1
 535 #if !defined(START_INFERIOR_TRAPS_EXPECTED)
 536 #define START_INFERIOR_TRAPS_EXPECTED   2
 537 #endif
 538 #endif /* !defined (INFERIOR_H) */