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, 1989, 1992, 1996, 1998 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #if !defined (INFERIOR_H)
  23 #define INFERIOR_H 1
  24
  25 /* For bpstat.  */
  26 #include "breakpoint.h"
  27
  28 /* For enum target_signal.  */
  29 #include "target.h"
  30
  31 /* Structure in which to save the status of the inferior.  Create/Save
  32    through "save_inferior_status", restore through
  33    "restore_inferior_status".
  34
  35    This pair of routines should be called around any transfer of
  36    control to the inferior which you don't want showing up in your
  37    control variables.  */
  38
  39 struct inferior_status;
  40
  41 extern struct inferior_status *save_inferior_status (int);
  42
  43 extern void restore_inferior_status (struct inferior_status *);
  44
  45 extern struct cleanup *make_cleanup_restore_inferior_status (struct inferior_status *);
  46
  47 extern void discard_inferior_status (struct inferior_status *);
  48
  49 extern void write_inferior_status_register (struct inferior_status
  50                                             *inf_status, int regno,
  51                                             LONGEST val);
  52
  53 /* This macro gives the number of registers actually in use by the
  54    inferior.  This may be less than the total number of registers,
  55    perhaps depending on the actual CPU in use or program being run.
  56    FIXME: This could be replaced by the new MULTI_ARCH capability.  */
  57
  58 #ifndef ARCH_NUM_REGS
  59 #define ARCH_NUM_REGS NUM_REGS
  60 #endif
  61
  62 extern void set_sigint_trap (void);
  63
  64 extern void clear_sigint_trap (void);
  65
  66 extern void set_sigio_trap (void);
  67
  68 extern void clear_sigio_trap (void);
  69
  70 /* File name for default use for standard in/out in the inferior.  */
  71
  72 extern char *inferior_io_terminal;
  73
  74 /* Pid of our debugged inferior, or 0 if no inferior now.  */
  75
  76 extern int inferior_pid;
  77
  78 /* Is the inferior running right now, as a result of a 'run&',
  79    'continue&' etc command? This is used in asycn gdb to determine
  80    whether a command that the user enters while the target is running
  81    is allowed or not. */
  82 extern int target_executing;
  83
  84 /* Are we simulating synchronous execution? This is used in async gdb
  85    to implement the 'run', 'continue' etc commands, which will not
  86    redisplay the prompt until the execution is actually over. */
  87 extern int sync_execution;
  88
  89 /* This is only valid when inferior_pid is non-zero.
  90
  91    If this is 0, then exec events should be noticed and responded to
  92    by the debugger (i.e., be reported to the user).
  93
  94    If this is > 0, then that many subsequent exec events should be
  95    ignored (i.e., not be reported to the user).
  96  */
  97 extern int inferior_ignoring_startup_exec_events;
  98
  99 /* This is only valid when inferior_ignoring_startup_exec_events is
 100    zero.
 101
 102    Some targets (stupidly) report more than one exec event per actual
 103    call to an event() system call.  If only the last such exec event
 104    need actually be noticed and responded to by the debugger (i.e.,
 105    be reported to the user), then this is the number of "leading"
 106    exec events which should be ignored.
 107  */
 108 extern int inferior_ignoring_leading_exec_events;
 109
 110 /* Inferior environment. */
 111
 112 extern struct environ *inferior_environ;
 113
 114 /* Character array containing an image of the inferior programs'
 115    registers. */
 116
 117 extern char *registers;
 118
 119 /* Character array containing the current state of each register
 120    (unavailable<0, valid=0, invalid>0). */
 121
 122 extern signed char *register_valid;
 123
 124 extern void clear_proceed_status (void);
 125
 126 extern void proceed (CORE_ADDR, enum target_signal, int);
 127
 128 extern void kill_inferior (void);
 129
 130 extern void generic_mourn_inferior (void);
 131
 132 extern void terminal_ours (void);
 133
 134 extern int run_stack_dummy (CORE_ADDR, char *);
 135
 136 extern CORE_ADDR read_pc (void);
 137
 138 extern CORE_ADDR read_pc_pid (int);
 139
 140 extern CORE_ADDR generic_target_read_pc (int);
 141
 142 extern void write_pc (CORE_ADDR);
 143
 144 extern void write_pc_pid (CORE_ADDR, int);
 145
 146 extern void generic_target_write_pc (CORE_ADDR, int);
 147
 148 extern CORE_ADDR read_sp (void);
 149
 150 extern CORE_ADDR generic_target_read_sp (void);
 151
 152 extern void write_sp (CORE_ADDR);
 153
 154 extern void generic_target_write_sp (CORE_ADDR);
 155
 156 extern CORE_ADDR read_fp (void);
 157
 158 extern CORE_ADDR generic_target_read_fp (void);
 159
 160 extern void write_fp (CORE_ADDR);
 161
 162 extern void generic_target_write_fp (CORE_ADDR);
 163
 164 extern CORE_ADDR unsigned_pointer_to_address (struct type *type, void *buf);
 165
 166 extern void unsigned_address_to_pointer (struct type *type, void *buf,
 167                                          CORE_ADDR addr);
 168 extern CORE_ADDR signed_pointer_to_address (struct type *type, void *buf);
 169 extern void address_to_signed_pointer (struct type *type, void *buf,
 170                                        CORE_ADDR addr);
 171
 172 extern void wait_for_inferior (void);
 173
 174 extern void fetch_inferior_event (void *);
 175
 176 extern void init_wait_for_inferior (void);
 177
 178 extern void close_exec_file (void);
 179
 180 extern void reopen_exec_file (void);
 181
 182 /* The `resume' routine should only be called in special circumstances.
 183    Normally, use `proceed', which handles a lot of bookkeeping.  */
 184
 185 extern void resume (int, enum target_signal);
 186
 187 /* From misc files */
 188
 189 extern void store_inferior_registers (int);
 190
 191 extern void fetch_inferior_registers (int);
 192
 193 extern void solib_create_inferior_hook (void);
 194
 195 extern void child_terminal_info (char *, int);
 196
 197 extern void term_info (char *, int);
 198
 199 extern void terminal_ours_for_output (void);
 200
 201 extern void terminal_inferior (void);
 202
 203 extern void terminal_init_inferior (void);
 204
 205 extern void terminal_init_inferior_with_pgrp (int pgrp);
 206
 207 /* From infptrace.c or infttrace.c */
 208
 209 extern int attach (int);
 210
 211 #if !defined(REQUIRE_ATTACH)
 212 #define REQUIRE_ATTACH attach
 213 #endif
 214
 215 #if !defined(REQUIRE_DETACH)
 216 #define REQUIRE_DETACH(pid,siggnal) detach (siggnal)
 217 #endif
 218
 219 extern void detach (int);
 220
 221 /* PTRACE method of waiting for inferior process.  */
 222 int ptrace_wait (int, int *);
 223
 224 extern void child_resume (int, int, enum target_signal);
 225
 226 #ifndef PTRACE_ARG3_TYPE
 227 #define PTRACE_ARG3_TYPE int    /* Correct definition for most systems. */
 228 #endif
 229
 230 extern int call_ptrace (int, int, PTRACE_ARG3_TYPE, int);
 231
 232 extern void pre_fork_inferior (void);
 233
 234 /* From procfs.c */
 235
 236 extern int proc_iterate_over_mappings (int (*)(int, CORE_ADDR));
 237
 238 extern int procfs_first_available (void);
 239
 240 /* From fork-child.c */
 241
 242 extern void fork_inferior (char *, char *, char **,
 243                            void (*)(void),
 244                            void (*)(int), void (*)(void), char *);
 245
 246
 247 extern void clone_and_follow_inferior (int, int *);
 248
 249 extern void startup_inferior (int);
 250
 251 /* From inflow.c */
 252
 253 extern void new_tty_prefork (char *);
 254
 255 extern int gdb_has_a_terminal (void);
 256
 257 /* From infrun.c */
 258
 259 extern void start_remote (void);
 260
 261 extern void normal_stop (void);
 262
 263 extern int signal_stop_state (int);
 264
 265 extern int signal_print_state (int);
 266
 267 extern int signal_pass_state (int);
 268
 269 extern int signal_stop_update (int, int);
 270
 271 extern int signal_print_update (int, int);
 272
 273 extern int signal_pass_update (int, int);
 274
 275 /* From infcmd.c */
 276
 277 extern void tty_command (char *, int);
 278
 279 extern void attach_command (char *, int);
 280
 281 /* Last signal that the inferior received (why it stopped).  */
 282
 283 extern enum target_signal stop_signal;
 284
 285 /* Address at which inferior stopped.  */
 286
 287 extern CORE_ADDR stop_pc;
 288
 289 /* Chain containing status of breakpoint(s) that we have stopped at.  */
 290
 291 extern bpstat stop_bpstat;
 292
 293 /* Flag indicating that a command has proceeded the inferior past the
 294    current breakpoint.  */
 295
 296 extern int breakpoint_proceeded;
 297
 298 /* Nonzero if stopped due to a step command.  */
 299
 300 extern int stop_step;
 301
 302 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 303
 304 extern int stop_stack_dummy;
 305
 306 /* Nonzero if program stopped due to a random (unexpected) signal in
 307    inferior process.  */
 308
 309 extern int stopped_by_random_signal;
 310
 311 /* Range to single step within.
 312    If this is nonzero, respond to a single-step signal
 313    by continuing to step if the pc is in this range.
 314
 315    If step_range_start and step_range_end are both 1, it means to step for
 316    a single instruction (FIXME: it might clean up wait_for_inferior in a
 317    minor way if this were changed to the address of the instruction and
 318    that address plus one.  But maybe not.).  */
 319
 320 extern CORE_ADDR step_range_start;      /* Inclusive */
 321 extern CORE_ADDR step_range_end;        /* Exclusive */
 322
 323 /* Stack frame address as of when stepping command was issued.
 324    This is how we know when we step into a subroutine call,
 325    and how to set the frame for the breakpoint used to step out.  */
 326
 327 extern CORE_ADDR step_frame_address;
 328
 329 /* Our notion of the current stack pointer.  */
 330
 331 extern CORE_ADDR step_sp;
 332
 333 /* 1 means step over all subroutine calls.
 334    -1 means step over calls to undebuggable functions.  */
 335
 336 extern int step_over_calls;
 337
 338 /* If stepping, nonzero means step count is > 1
 339    so don't print frame next time inferior stops
 340    if it stops due to stepping.  */
 341
 342 extern int step_multi;
 343
 344 /* Nonzero means expecting a trap and caller will handle it themselves.
 345    It is used after attach, due to attaching to a process;
 346    when running in the shell before the child program has been exec'd;
 347    and when running some kinds of remote stuff (FIXME?).  */
 348
 349 extern int stop_soon_quietly;
 350
 351 /* Nonzero if proceed is being used for a "finish" command or a similar
 352    situation when stop_registers should be saved.  */
 353
 354 extern int proceed_to_finish;
 355
 356 /* Save register contents here when about to pop a stack dummy frame,
 357    if-and-only-if proceed_to_finish is set.
 358    Thus this contains the return value from the called function (assuming
 359    values are returned in a register).  */
 360
 361 extern char *stop_registers;
 362
 363 /* Nonzero if the child process in inferior_pid was attached rather
 364    than forked.  */
 365
 366 extern int attach_flag;
 367 \f
 368 /* Sigtramp is a routine that the kernel calls (which then calls the
 369    signal handler).  On most machines it is a library routine that
 370    is linked into the executable.
 371
 372    This macro, given a program counter value and the name of the
 373    function in which that PC resides (which can be null if the
 374    name is not known), returns nonzero if the PC and name show
 375    that we are in sigtramp.
 376
 377    On most machines just see if the name is sigtramp (and if we have
 378    no name, assume we are not in sigtramp).  */
 379 #if !defined (IN_SIGTRAMP)
 380 #if defined (SIGTRAMP_START)
 381 #define IN_SIGTRAMP(pc, name) \
 382        ((pc) >= SIGTRAMP_START(pc)   \
 383         && (pc) < SIGTRAMP_END(pc) \
 384         )
 385 #else
 386 #define IN_SIGTRAMP(pc, name) \
 387        (name && STREQ ("_sigtramp", name))
 388 #endif
 389 #endif
 390 \f
 391 /* Possible values for CALL_DUMMY_LOCATION.  */
 392 #define ON_STACK 1
 393 #define BEFORE_TEXT_END 2
 394 #define AFTER_TEXT_END 3
 395 #define AT_ENTRY_POINT 4
 396
 397 #if !defined (USE_GENERIC_DUMMY_FRAMES)
 398 #define USE_GENERIC_DUMMY_FRAMES 0
 399 #endif
 400
 401 #if !defined (CALL_DUMMY_LOCATION)
 402 #define CALL_DUMMY_LOCATION ON_STACK
 403 #endif /* No CALL_DUMMY_LOCATION.  */
 404
 405 #if !defined (CALL_DUMMY_ADDRESS)
 406 #define CALL_DUMMY_ADDRESS() (internal_error ("CALL_DUMMY_ADDRESS"), 0)
 407 #endif
 408 #if !defined (CALL_DUMMY_START_OFFSET)
 409 #define CALL_DUMMY_START_OFFSET (internal_error ("CALL_DUMMY_START_OFFSET"), 0)
 410 #endif
 411 #if !defined (CALL_DUMMY_BREAKPOINT_OFFSET)
 412 #define CALL_DUMMY_BREAKPOINT_OFFSET_P (0)
 413 #define CALL_DUMMY_BREAKPOINT_OFFSET (internal_error ("CALL_DUMMY_BREAKPOINT_OFFSET"), 0)
 414 #endif
 415 #if !defined CALL_DUMMY_BREAKPOINT_OFFSET_P
 416 #define CALL_DUMMY_BREAKPOINT_OFFSET_P (1)
 417 #endif
 418 #if !defined (CALL_DUMMY_LENGTH)
 419 #define CALL_DUMMY_LENGTH (internal_error ("CALL_DUMMY_LENGTH"), 0)
 420 #endif
 421
 422 #if defined (CALL_DUMMY_STACK_ADJUST)
 423 #if !defined (CALL_DUMMY_STACK_ADJUST_P)
 424 #define CALL_DUMMY_STACK_ADJUST_P (1)
 425 #endif
 426 #endif
 427 #if !defined (CALL_DUMMY_STACK_ADJUST)
 428 #define CALL_DUMMY_STACK_ADJUST (internal_error ("CALL_DUMMY_STACK_ADJUST"), 0)
 429 #endif
 430 #if !defined (CALL_DUMMY_STACK_ADJUST_P)
 431 #define CALL_DUMMY_STACK_ADJUST_P (0)
 432 #endif
 433
 434 /* FIXME: cagney/2000-04-17: gdbarch should manage this.  The default
 435    shouldn't be necessary. */
 436
 437 #if !defined (CALL_DUMMY_P)
 438 #if defined (CALL_DUMMY)
 439 #define CALL_DUMMY_P 1
 440 #else
 441 #define CALL_DUMMY_P 0
 442 #endif
 443 #endif
 444
 445 #if !defined PUSH_DUMMY_FRAME
 446 #define PUSH_DUMMY_FRAME (internal_error ("PUSH_DUMMY_FRAME"), 0)
 447 #endif
 448
 449 #if !defined FIX_CALL_DUMMY
 450 #define FIX_CALL_DUMMY(a1,a2,a3,a4,a5,a6,a7) (internal_error ("FIX_CALL_DUMMY"), 0)
 451 #endif
 452
 453 #if !defined STORE_STRUCT_RETURN
 454 #define STORE_STRUCT_RETURN(a1,a2) (internal_error ("STORE_STRUCT_RETURN"), 0)
 455 #endif
 456
 457
 458 /* Are we in a call dummy? */
 459
 460 extern int pc_in_call_dummy_before_text_end (CORE_ADDR pc, CORE_ADDR sp,
 461                                              CORE_ADDR frame_address);
 462 #if !GDB_MULTI_ARCH
 463 #if !defined (PC_IN_CALL_DUMMY) && CALL_DUMMY_LOCATION == BEFORE_TEXT_END
 464 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) pc_in_call_dummy_before_text_end (pc, sp, frame_address)
 465 #endif /* Before text_end.  */
 466 #endif
 467
 468 extern int pc_in_call_dummy_after_text_end (CORE_ADDR pc, CORE_ADDR sp,
 469                                             CORE_ADDR frame_address);
 470 #if !GDB_MULTI_ARCH
 471 #if !defined (PC_IN_CALL_DUMMY) && CALL_DUMMY_LOCATION == AFTER_TEXT_END
 472 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) pc_in_call_dummy_after_text_end (pc, sp, frame_address)
 473 #endif
 474 #endif
 475
 476 extern int pc_in_call_dummy_on_stack (CORE_ADDR pc, CORE_ADDR sp,
 477                                       CORE_ADDR frame_address);
 478 #if !GDB_MULTI_ARCH
 479 #if !defined (PC_IN_CALL_DUMMY) && CALL_DUMMY_LOCATION == ON_STACK
 480 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) pc_in_call_dummy_on_stack (pc, sp, frame_address)
 481 #endif
 482 #endif
 483
 484 extern int pc_in_call_dummy_at_entry_point (CORE_ADDR pc, CORE_ADDR sp,
 485                                             CORE_ADDR frame_address);
 486 #if !GDB_MULTI_ARCH
 487 #if !defined (PC_IN_CALL_DUMMY) && CALL_DUMMY_LOCATION == AT_ENTRY_POINT
 488 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) pc_in_call_dummy_at_entry_point (pc, sp, frame_address)
 489 #endif
 490 #endif
 491
 492 /* It's often not enough for our clients to know whether the PC is merely
 493    somewhere within the call dummy.  They may need to know whether the
 494    call dummy has actually completed.  (For example, wait_for_inferior
 495    wants to know when it should truly stop because the call dummy has
 496    completed.  If we're single-stepping because of slow watchpoints,
 497    then we may find ourselves stopped at the entry of the call dummy,
 498    and want to continue stepping until we reach the end.)
 499
 500    Note that this macro is intended for targets (like HP-UX) which
 501    require more than a single breakpoint in their call dummies, and
 502    therefore cannot use the CALL_DUMMY_BREAKPOINT_OFFSET mechanism.
 503
 504    If a target does define CALL_DUMMY_BREAKPOINT_OFFSET, then this
 505    default implementation of CALL_DUMMY_HAS_COMPLETED is sufficient.
 506    Else, a target may wish to supply an implementation that works in
 507    the presense of multiple breakpoints in its call dummy.
 508  */
 509 #if !defined(CALL_DUMMY_HAS_COMPLETED)
 510 #define CALL_DUMMY_HAS_COMPLETED(pc, sp, frame_address) \
 511   PC_IN_CALL_DUMMY((pc), (sp), (frame_address))
 512 #endif
 513
 514 /* If STARTUP_WITH_SHELL is set, GDB's "run"
 515    will attempts to start up the debugee under a shell.
 516    This is in order for argument-expansion to occur. E.g.,
 517    (gdb) run *
 518    The "*" gets expanded by the shell into a list of files.
 519    While this is a nice feature, it turns out to interact badly
 520    with some of the catch-fork/catch-exec features we have added.
 521    In particular, if the shell does any fork/exec's before
 522    the exec of the target program, that can confuse GDB.
 523    To disable this feature, set STARTUP_WITH_SHELL to 0.
 524    To enable this feature, set STARTUP_WITH_SHELL to 1.
 525    The catch-exec traps expected during start-up will
 526    be 1 if target is not started up with a shell, 2 if it is.
 527    - RT
 528    If you disable this, you need to decrement
 529    START_INFERIOR_TRAPS_EXPECTED in tm.h. */
 530 #define STARTUP_WITH_SHELL 1
 531 #if !defined(START_INFERIOR_TRAPS_EXPECTED)
 532 #define START_INFERIOR_TRAPS_EXPECTED   2
 533 #endif
 534 #endif /* !defined (INFERIOR_H) */