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 do_registers_info (int, int);
 190
 191 extern void store_inferior_registers (int);
 192
 193 extern void fetch_inferior_registers (int);
 194
 195 extern void solib_create_inferior_hook (void);
 196
 197 extern void child_terminal_info (char *, int);
 198
 199 extern void term_info (char *, int);
 200
 201 extern void terminal_ours_for_output (void);
 202
 203 extern void terminal_inferior (void);
 204
 205 extern void terminal_init_inferior (void);
 206
 207 extern void terminal_init_inferior_with_pgrp (int pgrp);
 208
 209 /* From infptrace.c or infttrace.c */
 210
 211 extern int attach (int);
 212
 213 #if !defined(REQUIRE_ATTACH)
 214 #define REQUIRE_ATTACH attach
 215 #endif
 216
 217 #if !defined(REQUIRE_DETACH)
 218 #define REQUIRE_DETACH(pid,siggnal) detach (siggnal)
 219 #endif
 220
 221 extern void detach (int);
 222
 223 /* PTRACE method of waiting for inferior process.  */
 224 int ptrace_wait (int, int *);
 225
 226 extern void child_resume (int, int, enum target_signal);
 227
 228 #ifndef PTRACE_ARG3_TYPE
 229 #define PTRACE_ARG3_TYPE int    /* Correct definition for most systems. */
 230 #endif
 231
 232 extern int call_ptrace (int, int, PTRACE_ARG3_TYPE, int);
 233
 234 extern void pre_fork_inferior (void);
 235
 236 /* From procfs.c */
 237
 238 extern int proc_iterate_over_mappings (int (*)(int, CORE_ADDR));
 239
 240 extern int procfs_first_available (void);
 241
 242 /* From fork-child.c */
 243
 244 extern void fork_inferior (char *, char *, char **,
 245                            void (*)(void),
 246                            void (*)(int), void (*)(void), char *);
 247
 248
 249 extern void clone_and_follow_inferior (int, int *);
 250
 251 extern void startup_inferior (int);
 252
 253 /* From inflow.c */
 254
 255 extern void new_tty_prefork (char *);
 256
 257 extern int gdb_has_a_terminal (void);
 258
 259 /* From infrun.c */
 260
 261 extern void start_remote (void);
 262
 263 extern void normal_stop (void);
 264
 265 extern int signal_stop_state (int);
 266
 267 extern int signal_print_state (int);
 268
 269 extern int signal_pass_state (int);
 270
 271 extern int signal_stop_update (int, int);
 272
 273 extern int signal_print_update (int, int);
 274
 275 extern int signal_pass_update (int, int);
 276
 277 /* From infcmd.c */
 278
 279 extern void tty_command (char *, int);
 280
 281 extern void attach_command (char *, int);
 282
 283 /* Last signal that the inferior received (why it stopped).  */
 284
 285 extern enum target_signal stop_signal;
 286
 287 /* Address at which inferior stopped.  */
 288
 289 extern CORE_ADDR stop_pc;
 290
 291 /* Chain containing status of breakpoint(s) that we have stopped at.  */
 292
 293 extern bpstat stop_bpstat;
 294
 295 /* Flag indicating that a command has proceeded the inferior past the
 296    current breakpoint.  */
 297
 298 extern int breakpoint_proceeded;
 299
 300 /* Nonzero if stopped due to a step command.  */
 301
 302 extern int stop_step;
 303
 304 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 305
 306 extern int stop_stack_dummy;
 307
 308 /* Nonzero if program stopped due to a random (unexpected) signal in
 309    inferior process.  */
 310
 311 extern int stopped_by_random_signal;
 312
 313 /* Range to single step within.
 314    If this is nonzero, respond to a single-step signal
 315    by continuing to step if the pc is in this range.
 316
 317    If step_range_start and step_range_end are both 1, it means to step for
 318    a single instruction (FIXME: it might clean up wait_for_inferior in a
 319    minor way if this were changed to the address of the instruction and
 320    that address plus one.  But maybe not.).  */
 321
 322 extern CORE_ADDR step_range_start;      /* Inclusive */
 323 extern CORE_ADDR step_range_end;        /* Exclusive */
 324
 325 /* Stack frame address as of when stepping command was issued.
 326    This is how we know when we step into a subroutine call,
 327    and how to set the frame for the breakpoint used to step out.  */
 328
 329 extern CORE_ADDR step_frame_address;
 330
 331 /* Our notion of the current stack pointer.  */
 332
 333 extern CORE_ADDR step_sp;
 334
 335 /* 1 means step over all subroutine calls.
 336    -1 means step over calls to undebuggable functions.  */
 337
 338 extern int step_over_calls;
 339
 340 /* If stepping, nonzero means step count is > 1
 341    so don't print frame next time inferior stops
 342    if it stops due to stepping.  */
 343
 344 extern int step_multi;
 345
 346 /* Nonzero means expecting a trap and caller will handle it themselves.
 347    It is used after attach, due to attaching to a process;
 348    when running in the shell before the child program has been exec'd;
 349    and when running some kinds of remote stuff (FIXME?).  */
 350
 351 extern int stop_soon_quietly;
 352
 353 /* Nonzero if proceed is being used for a "finish" command or a similar
 354    situation when stop_registers should be saved.  */
 355
 356 extern int proceed_to_finish;
 357
 358 /* Save register contents here when about to pop a stack dummy frame,
 359    if-and-only-if proceed_to_finish is set.
 360    Thus this contains the return value from the called function (assuming
 361    values are returned in a register).  */
 362
 363 extern char *stop_registers;
 364
 365 /* Nonzero if the child process in inferior_pid was attached rather
 366    than forked.  */
 367
 368 extern int attach_flag;
 369 \f
 370 /* Sigtramp is a routine that the kernel calls (which then calls the
 371    signal handler).  On most machines it is a library routine that
 372    is linked into the executable.
 373
 374    This macro, given a program counter value and the name of the
 375    function in which that PC resides (which can be null if the
 376    name is not known), returns nonzero if the PC and name show
 377    that we are in sigtramp.
 378
 379    On most machines just see if the name is sigtramp (and if we have
 380    no name, assume we are not in sigtramp).  */
 381 #if !defined (IN_SIGTRAMP)
 382 #if defined (SIGTRAMP_START)
 383 #define IN_SIGTRAMP(pc, name) \
 384        ((pc) >= SIGTRAMP_START(pc)   \
 385         && (pc) < SIGTRAMP_END(pc) \
 386         )
 387 #else
 388 #define IN_SIGTRAMP(pc, name) \
 389        (name && STREQ ("_sigtramp", name))
 390 #endif
 391 #endif
 392 \f
 393 /* Possible values for CALL_DUMMY_LOCATION.  */
 394 #define ON_STACK 1
 395 #define BEFORE_TEXT_END 2
 396 #define AFTER_TEXT_END 3
 397 #define AT_ENTRY_POINT 4
 398
 399 #if !defined (USE_GENERIC_DUMMY_FRAMES)
 400 #define USE_GENERIC_DUMMY_FRAMES 0
 401 #endif
 402
 403 #if !defined (CALL_DUMMY_LOCATION)
 404 #define CALL_DUMMY_LOCATION ON_STACK
 405 #endif /* No CALL_DUMMY_LOCATION.  */
 406
 407 #if !defined (CALL_DUMMY_ADDRESS)
 408 #define CALL_DUMMY_ADDRESS() (internal_error ("CALL_DUMMY_ADDRESS"), 0)
 409 #endif
 410 #if !defined (CALL_DUMMY_START_OFFSET)
 411 #define CALL_DUMMY_START_OFFSET (internal_error ("CALL_DUMMY_START_OFFSET"), 0)
 412 #endif
 413 #if !defined (CALL_DUMMY_BREAKPOINT_OFFSET)
 414 #define CALL_DUMMY_BREAKPOINT_OFFSET_P (0)
 415 #define CALL_DUMMY_BREAKPOINT_OFFSET (internal_error ("CALL_DUMMY_BREAKPOINT_OFFSET"), 0)
 416 #endif
 417 #if !defined CALL_DUMMY_BREAKPOINT_OFFSET_P
 418 #define CALL_DUMMY_BREAKPOINT_OFFSET_P (1)
 419 #endif
 420 #if !defined (CALL_DUMMY_LENGTH)
 421 #define CALL_DUMMY_LENGTH (internal_error ("CALL_DUMMY_LENGTH"), 0)
 422 #endif
 423
 424 #if defined (CALL_DUMMY_STACK_ADJUST)
 425 #if !defined (CALL_DUMMY_STACK_ADJUST_P)
 426 #define CALL_DUMMY_STACK_ADJUST_P (1)
 427 #endif
 428 #endif
 429 #if !defined (CALL_DUMMY_STACK_ADJUST)
 430 #define CALL_DUMMY_STACK_ADJUST (internal_error ("CALL_DUMMY_STACK_ADJUST"), 0)
 431 #endif
 432 #if !defined (CALL_DUMMY_STACK_ADJUST_P)
 433 #define CALL_DUMMY_STACK_ADJUST_P (0)
 434 #endif
 435
 436 /* FIXME: cagney/2000-04-17: gdbarch should manage this.  The default
 437    shouldn't be necessary. */
 438
 439 #if !defined (CALL_DUMMY_P)
 440 #if defined (CALL_DUMMY)
 441 #define CALL_DUMMY_P 1
 442 #else
 443 #define CALL_DUMMY_P 0
 444 #endif
 445 #endif
 446
 447 #if !defined PUSH_DUMMY_FRAME
 448 #define PUSH_DUMMY_FRAME (internal_error ("PUSH_DUMMY_FRAME"), 0)
 449 #endif
 450
 451 #if !defined FIX_CALL_DUMMY
 452 #define FIX_CALL_DUMMY(a1,a2,a3,a4,a5,a6,a7) (internal_error ("FIX_CALL_DUMMY"), 0)
 453 #endif
 454
 455 #if !defined STORE_STRUCT_RETURN
 456 #define STORE_STRUCT_RETURN(a1,a2) (internal_error ("STORE_STRUCT_RETURN"), 0)
 457 #endif
 458
 459
 460 /* Are we in a call dummy? */
 461
 462 extern int pc_in_call_dummy_before_text_end (CORE_ADDR pc, CORE_ADDR sp,
 463                                              CORE_ADDR frame_address);
 464 #if !GDB_MULTI_ARCH
 465 #if !defined (PC_IN_CALL_DUMMY) && CALL_DUMMY_LOCATION == BEFORE_TEXT_END
 466 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) pc_in_call_dummy_before_text_end (pc, sp, frame_address)
 467 #endif /* Before text_end.  */
 468 #endif
 469
 470 extern int pc_in_call_dummy_after_text_end (CORE_ADDR pc, CORE_ADDR sp,
 471                                             CORE_ADDR frame_address);
 472 #if !GDB_MULTI_ARCH
 473 #if !defined (PC_IN_CALL_DUMMY) && CALL_DUMMY_LOCATION == AFTER_TEXT_END
 474 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) pc_in_call_dummy_after_text_end (pc, sp, frame_address)
 475 #endif
 476 #endif
 477
 478 extern int pc_in_call_dummy_on_stack (CORE_ADDR pc, CORE_ADDR sp,
 479                                       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 (CORE_ADDR pc, CORE_ADDR sp,
 487                                             CORE_ADDR frame_address);
 488 #if !GDB_MULTI_ARCH
 489 #if !defined (PC_IN_CALL_DUMMY) && CALL_DUMMY_LOCATION == AT_ENTRY_POINT
 490 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) pc_in_call_dummy_at_entry_point (pc, sp, frame_address)
 491 #endif
 492 #endif
 493
 494 /* It's often not enough for our clients to know whether the PC is merely
 495    somewhere within the call dummy.  They may need to know whether the
 496    call dummy has actually completed.  (For example, wait_for_inferior
 497    wants to know when it should truly stop because the call dummy has
 498    completed.  If we're single-stepping because of slow watchpoints,
 499    then we may find ourselves stopped at the entry of the call dummy,
 500    and want to continue stepping until we reach the end.)
 501
 502    Note that this macro is intended for targets (like HP-UX) which
 503    require more than a single breakpoint in their call dummies, and
 504    therefore cannot use the CALL_DUMMY_BREAKPOINT_OFFSET mechanism.
 505
 506    If a target does define CALL_DUMMY_BREAKPOINT_OFFSET, then this
 507    default implementation of CALL_DUMMY_HAS_COMPLETED is sufficient.
 508    Else, a target may wish to supply an implementation that works in
 509    the presense of multiple breakpoints in its call dummy.
 510  */
 511 #if !defined(CALL_DUMMY_HAS_COMPLETED)
 512 #define CALL_DUMMY_HAS_COMPLETED(pc, sp, frame_address) \
 513   PC_IN_CALL_DUMMY((pc), (sp), (frame_address))
 514 #endif
 515
 516 /* If STARTUP_WITH_SHELL is set, GDB's "run"
 517    will attempts to start up the debugee under a shell.
 518    This is in order for argument-expansion to occur. E.g.,
 519    (gdb) run *
 520    The "*" gets expanded by the shell into a list of files.
 521    While this is a nice feature, it turns out to interact badly
 522    with some of the catch-fork/catch-exec features we have added.
 523    In particular, if the shell does any fork/exec's before
 524    the exec of the target program, that can confuse GDB.
 525    To disable this feature, set STARTUP_WITH_SHELL to 0.
 526    To enable this feature, set STARTUP_WITH_SHELL to 1.
 527    The catch-exec traps expected during start-up will
 528    be 1 if target is not started up with a shell, 2 if it is.
 529    - RT
 530    If you disable this, you need to decrement
 531    START_INFERIOR_TRAPS_EXPECTED in tm.h. */
 532 #define STARTUP_WITH_SHELL 1
 533 #if !defined(START_INFERIOR_TRAPS_EXPECTED)
 534 #define START_INFERIOR_TRAPS_EXPECTED   2
 535 #endif
 536 #endif /* !defined (INFERIOR_H) */