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 (C) 1986, 1989 Free Software Foundation, Inc.
   4
   5 This file is part of GDB.
   6
   7 GDB 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 1, or (at your option)
  10 any later version.
  11
  12 GDB 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 GDB; see the file COPYING.  If not, write to
  19 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 /* For bpstat.  */
  22 #include "breakpoint.h"
  23
  24 /* For FRAME_ADDR.  */
  25 #include "frame.h"
  26
  27 /*
  28  * Structure in which to save the status of the inferior.  Save
  29  * through "save_inferior_status", restore through
  30  * "restore_inferior_status".
  31  * This pair of routines should be called around any transfer of
  32  * control to the inferior which you don't want showing up in your
  33  * control variables.
  34  */
  35 struct inferior_status {
  36   int pc_changed;
  37   int stop_signal;
  38   int stop_pc;
  39   FRAME_ADDR stop_frame_address;
  40   bpstat stop_bpstat;
  41   int stop_step;
  42   int stop_stack_dummy;
  43   int stopped_by_random_signal;
  44   int trap_expected;
  45   CORE_ADDR step_range_start;
  46   CORE_ADDR step_range_end;
  47   FRAME_ADDR step_frame_address;
  48   int step_over_calls;
  49   CORE_ADDR step_resume_break_address;
  50   int stop_after_trap;
  51   int stop_soon_quietly;
  52   FRAME_ADDR selected_frame_address;
  53   int selected_level;
  54   char stop_registers[REGISTER_BYTES];
  55   int breakpoint_proceeded;
  56   int restore_stack_info;
  57   int proceed_to_finish;
  58 };
  59
  60 void save_inferior_status (), restore_inferior_status ();
  61
  62 /* File name for default use for standard in/out in the inferior.  */
  63
  64 extern char *inferior_io_terminal;
  65
  66 /* Pid of our debugged inferior, or 0 if no inferior now.  */
  67
  68 extern int inferior_pid;
  69
  70 /* Character array containing an image of the inferior programs' registers.  */
  71
  72 extern char registers[];
  73
  74 extern void clear_proceed_status ();
  75 extern void start_inferior ();
  76 extern void proceed ();
  77 extern void kill_inferior ();
  78 extern void kill_inferior_fast ();
  79 extern void generic_mourn_inferior ();
  80 extern void terminal_ours ();
  81 extern void detach ();
  82 extern void run_stack_dummy ();
  83 extern CORE_ADDR read_pc ();
  84 extern void write_pc ();
  85 extern void wait_for_inferior ();
  86 extern void init_wait_for_inferior ();
  87 extern void close_exec_file ();
  88 extern void reopen_exec_file ();
  89
  90 /* Last signal that the inferior received (why it stopped).  */
  91
  92 extern int stop_signal;
  93
  94 /* Address at which inferior stopped.  */
  95
  96 extern CORE_ADDR stop_pc;
  97
  98 /* Stack frame when program stopped.  */
  99
 100 extern FRAME_ADDR stop_frame_address;
 101
 102 /* Chain containing status of breakpoint(s) that we have stopped at.  */
 103
 104 extern bpstat stop_bpstat;
 105
 106 /* Flag indicating that a command has proceeded the inferior past the
 107    current breakpoint.  */
 108
 109 extern int breakpoint_proceeded;
 110
 111 /* Nonzero if stopped due to a step command.  */
 112
 113 extern int stop_step;
 114
 115 /* Nonzero if stopped due to completion of a stack dummy routine.  */
 116
 117 extern int stop_stack_dummy;
 118
 119 /* Nonzero if program stopped due to a random (unexpected) signal in
 120    inferior process.  */
 121
 122 extern int stopped_by_random_signal;
 123
 124 /* Range to single step within.
 125    If this is nonzero, respond to a single-step signal
 126    by continuing to step if the pc is in this range.  */
 127
 128 extern CORE_ADDR step_range_start; /* Inclusive */
 129 extern CORE_ADDR step_range_end; /* Exclusive */
 130
 131 /* Stack frame address as of when stepping command was issued.
 132    This is how we know when we step into a subroutine call,
 133    and how to set the frame for the breakpoint used to step out.  */
 134
 135 extern FRAME_ADDR step_frame_address;
 136
 137 /* 1 means step over all subroutine calls.
 138    -1 means step over calls to undebuggable functions.  */
 139
 140 extern int step_over_calls;
 141
 142 /* If stepping, nonzero means step count is > 1
 143    so don't print frame next time inferior stops
 144    if it stops due to stepping.  */
 145
 146 extern int step_multi;
 147
 148 /* Nonzero if proceed is being used for a "finish" command or a similar
 149    situation when stop_registers should be saved.  */
 150
 151 extern int proceed_to_finish;
 152
 153 /* Save register contents here when about to pop a stack dummy frame,
 154    if-and-only-if proceed_to_finish is set.
 155    Thus this contains the return value from the called function (assuming
 156    values are returned in a register).  */
 157
 158 extern char stop_registers[REGISTER_BYTES];
 159
 160 /* Nonzero if pc has been changed by the debugger
 161    since the inferior stopped.  */
 162
 163 extern int pc_changed;
 164
 165 /* Nonzero if the child process in inferior_pid was attached rather
 166    than forked.  */
 167
 168 int attach_flag;
 169 \f
 170 /* Possible values for CALL_DUMMY_LOCATION.  */
 171 #define ON_STACK 1
 172 #define BEFORE_TEXT_END 2
 173 #define AFTER_TEXT_END 3
 174
 175 #if !defined (CALL_DUMMY_LOCATION)
 176 #if defined (CANNOT_EXECUTE_STACK)
 177 #define CALL_DUMMY_LOCATION BEFORE_TEXT_END
 178 #else /* Can execute stack.  */
 179 #define CALL_DUMMY_LOCATION ON_STACK
 180 #endif /* Can execute stack.  */
 181 #endif /* No CALL_DUMMY_LOCATION.  */
 182
 183 /* Are we in a call dummy?  The code below which allows DECR_PC_AFTER_BREAK
 184    below is for infrun.c, which may give the macro a pc without that
 185    subtracted out.  */
 186 #if !defined (PC_IN_CALL_DUMMY)
 187 #if CALL_DUMMY_LOCATION == BEFORE_TEXT_END
 188 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) \
 189   ((pc) >= text_end - CALL_DUMMY_LENGTH         \
 190    && (pc) < text_end + DECR_PC_AFTER_BREAK)
 191 #else /* Not before text_end.  */
 192 #if CALL_DUMMY_LOCATION == AFTER_TEXT_END
 193 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) \
 194   ((pc) >= text_end   \
 195    && (pc) < text_end + CALL_DUMMY_LENGTH + DECR_PC_AFTER_BREAK)
 196 #else /* On stack.  */
 197 #define PC_IN_CALL_DUMMY(pc, sp, frame_address) \
 198   ((sp) INNER_THAN (pc) && (pc) INNER_THAN (frame_address))
 199 #endif /* On stack.  */
 200 #endif /* Not before text_end.  */
 201 #endif /* No PC_IN_CALL_DUMMY.  */