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