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 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 #if !defined (INFERIOR_H)
  22 #define INFERIOR_H 1
  23
  24 /* For bpstat.  */
  25 #include "breakpoint.h"
  26
  27 /* For FRAME_ADDR.  */
  28 #include "frame.h"
  29
  30 /* For enum target_signal.  */
  31 #include "target.h"
  32
  33 /*
  34  * Structure in which to save the status of the inferior.  Save
  35  * through "save_inferior_status", restore through
  36  * "restore_inferior_status".
  37  * This pair of routines should be called around any transfer of
  38  * control to the inferior which you don't want showing up in your
  39  * control variables.
  40  */
  41 struct inferior_status {
  42   enum target_signal stop_signal;
  43   CORE_ADDR stop_pc;
  44   FRAME_ADDR stop_frame_address;
  45   bpstat stop_bpstat;
  46   int stop_step;
  47   int stop_stack_dummy;
  48   int stopped_by_random_signal;
  49   int trap_expected;
  50   CORE_ADDR step_range_start;
  51   CORE_ADDR step_range_end;
  52   FRAME_ADDR step_frame_address;
  53   int step_over_calls;
  54   CORE_ADDR step_resume_break_address;
  55   int stop_after_trap;
  56   int stop_soon_quietly;
  57   FRAME_ADDR selected_frame_address;
  58   int selected_level;
  59   char stop_registers[REGISTER_BYTES];
  60
  61   /* These are here because if call_function_by_hand has written some
  62      registers and then decides to call error(), we better not have changed
  63      any registers.  */
  64   char registers[REGISTER_BYTES];
  65
  66   int breakpoint_proceeded;
  67   int restore_stack_info;
  68   int proceed_to_finish;
  69 };
  70
  71 extern void
  72 save_inferior_status PARAMS ((struct inferior_status *, int));
  73
  74 extern void
  75 restore_inferior_status PARAMS ((struct inferior_status *));
  76
  77 extern void set_sigint_trap PARAMS ((void));
  78 extern void clear_sigint_trap PARAMS ((void));
  79
  80 extern void set_sigio_trap PARAMS ((void));
  81 extern void clear_sigio_trap PARAMS ((void));
  82
  83 /* File name for default use for standard in/out in the inferior.  */
  84
  85 extern char *inferior_io_terminal;
  86
  87 /* Pid of our debugged inferior, or 0 if no inferior now.  */
  88
  89 extern int inferior_pid;
  90
  91 /* Character array containing an image of the inferior programs' registers.  */
  92
  93 extern char registers[];
  94
  95 /* Array of validity bits (one per register).  Nonzero at position XXX_REGNUM
  96    means that `registers' contains a valid copy of inferior register XXX.  */
  97
  98 extern char register_valid[NUM_REGS];
  99
 100 extern void
 101 clear_proceed_status PARAMS ((void));
 102
 103 extern void
 104 proceed PARAMS ((CORE_ADDR, enum target_signal, int));
 105
 106 extern void
 107 kill_inferior PARAMS ((void));
 108
 109 extern void
 110 generic_mourn_inferior PARAMS ((void));
 111
 112 extern void
 113 terminal_ours PARAMS ((void));
 114
 115 extern int run_stack_dummy PARAMS ((CORE_ADDR, char [REGISTER_BYTES]));
 116
 117 extern CORE_ADDR
 118 read_pc PARAMS ((void));
 119
 120 extern CORE_ADDR
 121 read_pc_pid PARAMS ((int));
 122
 123 extern void
 124 write_pc PARAMS ((CORE_ADDR));
 125
 126 extern CORE_ADDR
 127 read_sp PARAMS ((void));
 128
 129 extern void
 130 write_sp PARAMS ((CORE_ADDR));
 131
 132 extern CORE_ADDR
 133 read_fp PARAMS ((void));
 134
 135 extern void
 136 write_fp PARAMS ((CORE_ADDR));
 137
 138 extern void
 139 wait_for_inferior PARAMS ((void));
 140
 141 extern void
 142 init_wait_for_inferior PARAMS ((void));
 143
 144 extern void
 145 close_exec_file PARAMS ((void));
 146
 147 extern void
 148 reopen_exec_file PARAMS ((void));
 149
 150 /* The `resume' routine should only be called in special circumstances.
 151    Normally, use `proceed', which handles a lot of bookkeeping.  */
 152 extern void
 153 resume PARAMS ((int, enum target_signal));
 154
 155 /* From misc files */
 156
 157 extern void
 158 store_inferior_registers PARAMS ((int));
 159
 160 extern void
 161 fetch_inferior_registers PARAMS ((int));
 162
 163 extern void
 164 solib_create_inferior_hook PARAMS ((void));
 165
 166 extern void
 167 child_terminal_info PARAMS ((char *, int));
 168
 169 extern void
 170 term_info PARAMS ((char *, int));
 171
 172 extern void
 173 terminal_ours_for_output PARAMS ((void));
 174
 175 extern void
 176 terminal_inferior PARAMS ((void));
 177
 178 extern void
 179 terminal_init_inferior PARAMS ((void));
 180
 181 /* From infptrace.c */
 182
 183 extern int
 184 attach PARAMS ((int));
 185
 186 void
 187 detach PARAMS ((int));
 188
 189 extern void
 190 child_resume PARAMS ((int, int, enum target_signal));
 191
 192 #ifndef PTRACE_ARG3_TYPE
 193 #define PTRACE_ARG3_TYPE int    /* Correct definition for most systems. */
 194 #endif
 195
 196 extern int
 197 call_ptrace PARAMS ((int, int, PTRACE_ARG3_TYPE, int));
 198
 199 /* From procfs.c */
 200
 201 extern int
 202 proc_iterate_over_mappings PARAMS ((int (*) (int, CORE_ADDR)));
 203
 204 /* From fork-child.c */
 205
 206 extern void fork_inferior PARAMS ((char *, char *, char **,
 207                                    void (*) (void),
 208                                    void (*) (int), char *));
 209
 210 extern void startup_inferior PARAMS ((int));
 211
 212 /* From inflow.c */
 213
 214 extern void
 215 new_tty_prefork PARAMS ((char *));
 216
 217 extern int gdb_has_a_terminal PARAMS ((void));
 218
 219 /* From infrun.c */
 220
 221 extern void
 222 start_remote PARAMS ((void));
 223
 224 extern void
 225 normal_stop PARAMS ((void));
 226
 227 extern int
 228 signal_stop_state PARAMS ((int));
 229
 230 extern int
 231 signal_print_state PARAMS ((int));
 232
 233 extern int
 234 signal_pass_state PARAMS ((int));
 235
 236 /* From infcmd.c */
 237
 238 extern void
 239 tty_command PARAMS ((char *, int));
 240
 241 extern void
 242 attach_command PARAMS ((char *, int));
 243
 244 /* Last signal that the inferior received (why it stopped).  */
 245
 246 extern enum target_signal stop_signal;
 247
 248 /* Address at which inferior stopped.  */
 249
 250 extern CORE_ADDR stop_pc;
 251
 252 /* Stack frame when program stopped.  */
 253
 254 extern FRAME_ADDR stop_frame_address;
 255
 256 /* Chain containing status of breakpoint(s) that we have stopped at.  */
 257
 258 extern bpstat stop_bpstat;
 259
 260 /* Flag indicating that a command has proceeded the inferior past the
 261    current breakpoint.  */
 262
 263 extern int breakpoint_proceeded;
 264
 265 /* Nonzero if stopped due to a step command.  */
 266
 267 extern int stop_step;
 268
 269 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 270
 271 extern int stop_stack_dummy;
 272
 273 /* Nonzero if program stopped due to a random (unexpected) signal in
 274    inferior process.  */
 275
 276 extern int stopped_by_random_signal;
 277
 278 /* Range to single step within.
 279    If this is nonzero, respond to a single-step signal
 280    by continuing to step if the pc is in this range.
 281
 282    If step_range_start and step_range_end are both 1, it means to step for
 283    a single instruction (FIXME: it might clean up wait_for_inferior in a
 284    minor way if this were changed to the address of the instruction and
 285    that address plus one.  But maybe not.).  */
 286
 287 extern CORE_ADDR step_range_start; /* Inclusive */
 288 extern CORE_ADDR step_range_end; /* Exclusive */
 289
 290 /* Stack frame address as of when stepping command was issued.
 291    This is how we know when we step into a subroutine call,
 292    and how to set the frame for the breakpoint used to step out.  */
 293
 294 extern FRAME_ADDR step_frame_address;
 295
 296 /* 1 means step over all subroutine calls.
 297    -1 means step over calls to undebuggable functions.  */
 298
 299 extern int step_over_calls;
 300
 301 /* If stepping, nonzero means step count is > 1
 302    so don't print frame next time inferior stops
 303    if it stops due to stepping.  */
 304
 305 extern int step_multi;
 306
 307 /* Nonzero means expecting a trap and caller will handle it themselves.
 308    It is used after attach, due to attaching to a process;
 309    when running in the shell before the child program has been exec'd;
 310    and when running some kinds of remote stuff (FIXME?).  */
 311
 312 extern int stop_soon_quietly;
 313
 314 /* Nonzero if proceed is being used for a "finish" command or a similar
 315    situation when stop_registers should be saved.  */
 316
 317 extern int proceed_to_finish;
 318
 319 /* Save register contents here when about to pop a stack dummy frame,
 320    if-and-only-if proceed_to_finish is set.
 321    Thus this contains the return value from the called function (assuming
 322    values are returned in a register).  */
 323
 324 extern char stop_registers[REGISTER_BYTES];
 325
 326 /* Nonzero if the child process in inferior_pid was attached rather
 327    than forked.  */
 328
 329 extern int attach_flag;
 330 \f
 331 /* Sigtramp is a routine that the kernel calls (which then calls the
 332    signal handler).  On most machines it is a library routine that
 333    is linked into the executable.
 334
 335    This macro, given a program counter value and the name of the
 336    function in which that PC resides (which can be null if the
 337    name is not known), returns nonzero if the PC and name show
 338    that we are in sigtramp.
 339
 340    On most machines just see if the name is sigtramp (and if we have
 341    no name, assume we are not in sigtramp).  */
 342 #if !defined (IN_SIGTRAMP)
 343 #  if defined (SIGTRAMP_START)
 344 #    define IN_SIGTRAMP(pc, name) \
 345        ((pc) >= SIGTRAMP_START   \
 346         && (pc) < SIGTRAMP_END \
 347         )
 348 #  else
 349 #    define IN_SIGTRAMP(pc, name) \
 350        (name && STREQ ("_sigtramp", name))
 351 #  endif
 352 #endif
 353 \f
 354 /* Possible values for CALL_DUMMY_LOCATION.  */
 355 #define ON_STACK 1
 356 #define BEFORE_TEXT_END 2
 357 #define AFTER_TEXT_END 3
 358 #define AT_ENTRY_POINT 4
 359
 360 #if !defined (CALL_DUMMY_LOCATION)
 361 #define CALL_DUMMY_LOCATION ON_STACK
 362 #endif /* No CALL_DUMMY_LOCATION.  */
 363
 364 /* Are we in a call dummy?  The code below which allows DECR_PC_AFTER_BREAK
 365    below is for infrun.c, which may give the macro a pc without that
 366    subtracted out.  */
 367 #if !defined (PC_IN_CALL_DUMMY)
 368 #if CALL_DUMMY_LOCATION == BEFORE_TEXT_END
 369 extern CORE_ADDR text_end;
 370 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) \
 371   ((pc) >= text_end - CALL_DUMMY_LENGTH         \
 372    && (pc) <= text_end + DECR_PC_AFTER_BREAK)
 373 #endif /* Before text_end.  */
 374
 375 #if CALL_DUMMY_LOCATION == AFTER_TEXT_END
 376 extern CORE_ADDR text_end;
 377 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) \
 378   ((pc) >= text_end   \
 379    && (pc) <= text_end + CALL_DUMMY_LENGTH + DECR_PC_AFTER_BREAK)
 380 #endif /* After text_end.  */
 381
 382 #if CALL_DUMMY_LOCATION == ON_STACK
 383 /* Is the PC in a call dummy?  SP and FRAME_ADDRESS are the bottom and
 384    top of the stack frame which we are checking, where "bottom" and
 385    "top" refer to some section of memory which contains the code for
 386    the call dummy.  Calls to this macro assume that the contents of
 387    SP_REGNUM and FP_REGNUM (or the saved values thereof), respectively,
 388    are the things to pass.
 389
 390    This won't work on the 29k, where SP_REGNUM and FP_REGNUM don't
 391    have that meaning, but the 29k doesn't use ON_STACK.  This could be
 392    fixed by generalizing this scheme, perhaps by passing in a frame
 393    and adding a few fields, at least on machines which need them for
 394    PC_IN_CALL_DUMMY.
 395
 396    Something simpler, like checking for the stack segment, doesn't work,
 397    since various programs (threads implementations, gcc nested function
 398    stubs, etc) may either allocate stack frames in another segment, or
 399    allocate other kinds of code on the stack.  */
 400
 401 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) \
 402   ((sp) INNER_THAN (pc) && (frame_address != 0) && (pc) INNER_THAN (frame_address))
 403 #endif /* On stack.  */
 404
 405 #if CALL_DUMMY_LOCATION == AT_ENTRY_POINT
 406 #define PC_IN_CALL_DUMMY(pc, sp, frame_address)                 \
 407   ((pc) >= CALL_DUMMY_ADDRESS ()                                \
 408    && (pc) <= (CALL_DUMMY_ADDRESS () + DECR_PC_AFTER_BREAK))
 409 #endif /* At entry point.  */
 410 #endif /* No PC_IN_CALL_DUMMY.  */
 411
 412 #endif  /* !defined (INFERIOR_H) */