472 lines
15 KiB
C
472 lines
15 KiB
C
/* Variables that describe the inferior process running under GDB:
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Where it is, why it stopped, and how to step it.
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Copyright 1986, 1989, 1992, 1996, 1998 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#if !defined (INFERIOR_H)
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#define INFERIOR_H 1
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/* For bpstat. */
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#include "breakpoint.h"
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/* For enum target_signal. */
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#include "target.h"
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/* Structure in which to save the status of the inferior. Save
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through "save_inferior_status", restore through
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"restore_inferior_status".
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This pair of routines should be called around any transfer of
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control to the inferior which you don't want showing up in your
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control variables. */
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struct inferior_status {
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enum target_signal stop_signal;
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CORE_ADDR stop_pc;
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bpstat stop_bpstat;
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int stop_step;
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int stop_stack_dummy;
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int stopped_by_random_signal;
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int trap_expected;
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CORE_ADDR step_range_start;
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CORE_ADDR step_range_end;
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CORE_ADDR step_frame_address;
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int step_over_calls;
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CORE_ADDR step_resume_break_address;
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int stop_after_trap;
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int stop_soon_quietly;
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CORE_ADDR selected_frame_address;
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char stop_registers[REGISTER_BYTES];
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/* These are here because if call_function_by_hand has written some
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registers and then decides to call error(), we better not have changed
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any registers. */
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char registers[REGISTER_BYTES];
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int selected_level;
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int breakpoint_proceeded;
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int restore_stack_info;
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int proceed_to_finish;
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};
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/* This macro gives the number of registers actually in use by the
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inferior. This may be less than the total number of registers,
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perhaps depending on the actual CPU in use or program being run. */
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#ifndef ARCH_NUM_REGS
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#define ARCH_NUM_REGS NUM_REGS
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#endif
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extern void save_inferior_status PARAMS ((struct inferior_status *, int));
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extern void restore_inferior_status PARAMS ((struct inferior_status *));
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extern void set_sigint_trap PARAMS ((void));
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extern void clear_sigint_trap PARAMS ((void));
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extern void set_sigio_trap PARAMS ((void));
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extern void clear_sigio_trap PARAMS ((void));
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/* File name for default use for standard in/out in the inferior. */
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extern char *inferior_io_terminal;
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/* Pid of our debugged inferior, or 0 if no inferior now. */
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extern int inferior_pid;
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/* This is only valid when inferior_pid is non-zero.
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If this is 0, then exec events should be noticed and responded to
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by the debugger (i.e., be reported to the user).
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If this is > 0, then that many subsequent exec events should be
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ignored (i.e., not be reported to the user).
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*/
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extern int inferior_ignoring_startup_exec_events;
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/* This is only valid when inferior_ignoring_startup_exec_events is
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zero.
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Some targets (stupidly) report more than one exec event per actual
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call to an event() system call. If only the last such exec event
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need actually be noticed and responded to by the debugger (i.e.,
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be reported to the user), then this is the number of "leading"
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exec events which should be ignored.
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*/
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extern int inferior_ignoring_leading_exec_events;
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/* Inferior environment. */
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extern struct environ *inferior_environ;
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/* Character array containing an image of the inferior programs' registers. */
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extern char registers[];
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/* Array of validity bits (one per register). Nonzero at position XXX_REGNUM
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means that `registers' contains a valid copy of inferior register XXX.
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-1 if register value is not available. */
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extern SIGNED char register_valid[NUM_REGS];
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extern void clear_proceed_status PARAMS ((void));
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extern void proceed PARAMS ((CORE_ADDR, enum target_signal, int));
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extern void kill_inferior PARAMS ((void));
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extern void generic_mourn_inferior PARAMS ((void));
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extern void terminal_ours PARAMS ((void));
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extern int run_stack_dummy PARAMS ((CORE_ADDR, char [REGISTER_BYTES]));
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extern CORE_ADDR read_pc PARAMS ((void));
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extern CORE_ADDR read_pc_pid PARAMS ((int));
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extern void write_pc PARAMS ((CORE_ADDR));
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extern void write_pc_pid PARAMS ((CORE_ADDR, int));
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extern CORE_ADDR read_sp PARAMS ((void));
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extern void write_sp PARAMS ((CORE_ADDR));
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extern CORE_ADDR read_fp PARAMS ((void));
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extern void write_fp PARAMS ((CORE_ADDR));
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extern void wait_for_inferior PARAMS ((void));
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extern void init_wait_for_inferior PARAMS ((void));
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extern void close_exec_file PARAMS ((void));
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extern void reopen_exec_file PARAMS ((void));
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/* The `resume' routine should only be called in special circumstances.
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Normally, use `proceed', which handles a lot of bookkeeping. */
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extern void resume PARAMS ((int, enum target_signal));
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/* From misc files */
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extern void store_inferior_registers PARAMS ((int));
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extern void fetch_inferior_registers PARAMS ((int));
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extern void solib_create_inferior_hook PARAMS ((void));
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extern void child_terminal_info PARAMS ((char *, int));
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extern void term_info PARAMS ((char *, int));
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extern void terminal_ours_for_output PARAMS ((void));
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extern void terminal_inferior PARAMS ((void));
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extern void terminal_init_inferior PARAMS ((void));
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extern void terminal_init_inferior_with_pgrp PARAMS ((int pgrp));
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/* From infptrace.c or infttrace.c */
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extern int attach PARAMS ((int));
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#if !defined(REQUIRE_ATTACH)
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#define REQUIRE_ATTACH attach
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#endif
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#if !defined(REQUIRE_DETACH)
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#define REQUIRE_DETACH(pid,siggnal) detach (siggnal)
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#endif
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extern void detach PARAMS ((int));
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int proc_wait PARAMS ((int, int *));
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extern void child_resume PARAMS ((int, int, enum target_signal));
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#ifndef PTRACE_ARG3_TYPE
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#define PTRACE_ARG3_TYPE int /* Correct definition for most systems. */
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#endif
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extern int call_ptrace PARAMS ((int, int, PTRACE_ARG3_TYPE, int));
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extern void pre_fork_inferior PARAMS ((void));
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/* From procfs.c */
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extern int proc_iterate_over_mappings PARAMS ((int (*) (int, CORE_ADDR)));
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extern int procfs_first_available PARAMS ((void));
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extern int procfs_get_pid_fd PARAMS ((int));
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/* From fork-child.c */
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extern void fork_inferior PARAMS ((char *, char *, char **,
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void (*) (void),
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void (*) (int),
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void (*) (void),
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char *));
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extern void
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clone_and_follow_inferior PARAMS ((int, int *));
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extern void startup_inferior PARAMS ((int));
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/* From inflow.c */
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extern void new_tty_prefork PARAMS ((char *));
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extern int gdb_has_a_terminal PARAMS ((void));
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/* From infrun.c */
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extern void start_remote PARAMS ((void));
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extern void normal_stop PARAMS ((void));
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extern int signal_stop_state PARAMS ((int));
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extern int signal_print_state PARAMS ((int));
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extern int signal_pass_state PARAMS ((int));
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/* From infcmd.c */
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extern void tty_command PARAMS ((char *, int));
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extern void attach_command PARAMS ((char *, int));
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/* Last signal that the inferior received (why it stopped). */
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extern enum target_signal stop_signal;
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/* Address at which inferior stopped. */
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extern CORE_ADDR stop_pc;
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/* Chain containing status of breakpoint(s) that we have stopped at. */
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extern bpstat stop_bpstat;
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/* Flag indicating that a command has proceeded the inferior past the
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current breakpoint. */
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extern int breakpoint_proceeded;
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/* Nonzero if stopped due to a step command. */
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extern int stop_step;
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/* Nonzero if stopped due to completion of a stack dummy routine. */
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extern int stop_stack_dummy;
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/* Nonzero if program stopped due to a random (unexpected) signal in
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inferior process. */
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extern int stopped_by_random_signal;
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/* Range to single step within.
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If this is nonzero, respond to a single-step signal
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by continuing to step if the pc is in this range.
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If step_range_start and step_range_end are both 1, it means to step for
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a single instruction (FIXME: it might clean up wait_for_inferior in a
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minor way if this were changed to the address of the instruction and
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that address plus one. But maybe not.). */
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extern CORE_ADDR step_range_start; /* Inclusive */
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extern CORE_ADDR step_range_end; /* Exclusive */
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/* Stack frame address as of when stepping command was issued.
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This is how we know when we step into a subroutine call,
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and how to set the frame for the breakpoint used to step out. */
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extern CORE_ADDR step_frame_address;
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/* Our notion of the current stack pointer. */
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extern CORE_ADDR step_sp;
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/* 1 means step over all subroutine calls.
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-1 means step over calls to undebuggable functions. */
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extern int step_over_calls;
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/* If stepping, nonzero means step count is > 1
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so don't print frame next time inferior stops
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if it stops due to stepping. */
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extern int step_multi;
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/* Nonzero means expecting a trap and caller will handle it themselves.
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It is used after attach, due to attaching to a process;
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when running in the shell before the child program has been exec'd;
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and when running some kinds of remote stuff (FIXME?). */
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extern int stop_soon_quietly;
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/* Nonzero if proceed is being used for a "finish" command or a similar
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situation when stop_registers should be saved. */
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extern int proceed_to_finish;
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/* Save register contents here when about to pop a stack dummy frame,
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if-and-only-if proceed_to_finish is set.
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Thus this contains the return value from the called function (assuming
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values are returned in a register). */
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extern char stop_registers[REGISTER_BYTES];
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/* Nonzero if the child process in inferior_pid was attached rather
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than forked. */
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extern int attach_flag;
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/* Sigtramp is a routine that the kernel calls (which then calls the
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signal handler). On most machines it is a library routine that
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is linked into the executable.
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This macro, given a program counter value and the name of the
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function in which that PC resides (which can be null if the
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name is not known), returns nonzero if the PC and name show
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that we are in sigtramp.
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On most machines just see if the name is sigtramp (and if we have
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no name, assume we are not in sigtramp). */
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#if !defined (IN_SIGTRAMP)
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# if defined (SIGTRAMP_START)
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# define IN_SIGTRAMP(pc, name) \
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((pc) >= SIGTRAMP_START(pc) \
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&& (pc) < SIGTRAMP_END(pc) \
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)
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# else
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# define IN_SIGTRAMP(pc, name) \
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(name && STREQ ("_sigtramp", name))
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# endif
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#endif
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/* Possible values for CALL_DUMMY_LOCATION. */
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#define ON_STACK 1
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#define BEFORE_TEXT_END 2
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#define AFTER_TEXT_END 3
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#define AT_ENTRY_POINT 4
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#if !defined (CALL_DUMMY_LOCATION)
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#define CALL_DUMMY_LOCATION ON_STACK
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#endif /* No CALL_DUMMY_LOCATION. */
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/* Are we in a call dummy? The code below which allows DECR_PC_AFTER_BREAK
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below is for infrun.c, which may give the macro a pc without that
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subtracted out. */
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#if !defined (PC_IN_CALL_DUMMY)
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#if CALL_DUMMY_LOCATION == BEFORE_TEXT_END
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extern CORE_ADDR text_end;
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#define PC_IN_CALL_DUMMY(pc, sp, frame_address) \
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((pc) >= text_end - CALL_DUMMY_LENGTH \
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&& (pc) <= text_end + DECR_PC_AFTER_BREAK)
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#endif /* Before text_end. */
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#if CALL_DUMMY_LOCATION == AFTER_TEXT_END
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extern CORE_ADDR text_end;
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#define PC_IN_CALL_DUMMY(pc, sp, frame_address) \
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((pc) >= text_end \
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&& (pc) <= text_end + CALL_DUMMY_LENGTH + DECR_PC_AFTER_BREAK)
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#endif /* After text_end. */
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#if CALL_DUMMY_LOCATION == ON_STACK
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/* Is the PC in a call dummy? SP and FRAME_ADDRESS are the bottom and
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top of the stack frame which we are checking, where "bottom" and
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"top" refer to some section of memory which contains the code for
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the call dummy. Calls to this macro assume that the contents of
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SP_REGNUM and FP_REGNUM (or the saved values thereof), respectively,
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are the things to pass.
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This won't work on the 29k, where SP_REGNUM and FP_REGNUM don't
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have that meaning, but the 29k doesn't use ON_STACK. This could be
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fixed by generalizing this scheme, perhaps by passing in a frame
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and adding a few fields, at least on machines which need them for
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PC_IN_CALL_DUMMY.
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Something simpler, like checking for the stack segment, doesn't work,
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since various programs (threads implementations, gcc nested function
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stubs, etc) may either allocate stack frames in another segment, or
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allocate other kinds of code on the stack. */
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#define PC_IN_CALL_DUMMY(pc, sp, frame_address) \
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(INNER_THAN ((sp), (pc)) && (frame_address != 0) && INNER_THAN ((pc), (frame_address)))
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#endif /* On stack. */
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#if CALL_DUMMY_LOCATION == AT_ENTRY_POINT
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#define PC_IN_CALL_DUMMY(pc, sp, frame_address) \
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((pc) >= CALL_DUMMY_ADDRESS () \
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&& (pc) <= (CALL_DUMMY_ADDRESS () + DECR_PC_AFTER_BREAK))
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#endif /* At entry point. */
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#endif /* No PC_IN_CALL_DUMMY. */
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/* It's often not enough for our clients to know whether the PC is merely
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somewhere within the call dummy. They may need to know whether the
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call dummy has actually completed. (For example, wait_for_inferior
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wants to know when it should truly stop because the call dummy has
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completed. If we're single-stepping because of slow watchpoints,
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then we may find ourselves stopped at the entry of the call dummy,
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and want to continue stepping until we reach the end.)
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Note that this macro is intended for targets (like HP-UX) which
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require more than a single breakpoint in their call dummies, and
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therefore cannot use the CALL_DUMMY_BREAKPOINT_OFFSET mechanism.
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If a target does define CALL_DUMMY_BREAKPOINT_OFFSET, then this
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default implementation of CALL_DUMMY_HAS_COMPLETED is sufficient.
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Else, a target may wish to supply an implementation that works in
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the presense of multiple breakpoints in its call dummy.
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*/
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#if !defined(CALL_DUMMY_HAS_COMPLETED)
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#define CALL_DUMMY_HAS_COMPLETED(pc, sp, frame_address) \
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PC_IN_CALL_DUMMY((pc), (sp), (frame_address))
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#endif
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/* If STARTUP_WITH_SHELL is set, GDB's "run"
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will attempts to start up the debugee under a shell.
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This is in order for argument-expansion to occur. E.g.,
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(gdb) run *
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The "*" gets expanded by the shell into a list of files.
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While this is a nice feature, it turns out to interact badly
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with some of the catch-fork/catch-exec features we have added.
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In particular, if the shell does any fork/exec's before
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the exec of the target program, that can confuse GDB.
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To disable this feature, set STARTUP_WITH_SHELL to 0.
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To enable this feature, set STARTUP_WITH_SHELL to 1.
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The catch-exec traps expected during start-up will
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be 1 if target is not started up with a shell, 2 if it is.
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- RT
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If you disable this, you need to decrement
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START_INFERIOR_TRAPS_EXPECTED in tm.h. */
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#define STARTUP_WITH_SHELL 1
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#endif /* !defined (INFERIOR_H) */
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