mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-11-29 06:50:32 +00:00
479 lines
12 KiB
C
479 lines
12 KiB
C
/* Low level interface to ptrace, for GDB when running under Unix.
|
||
Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
GDB is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 1, or (at your option)
|
||
any later version.
|
||
|
||
GDB is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with GDB; see the file COPYING. If not, write to
|
||
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
#include <stdio.h>
|
||
#include "defs.h"
|
||
#include "param.h"
|
||
#include "frame.h"
|
||
#include "inferior.h"
|
||
#include "command.h"
|
||
#include "signals.h"
|
||
#include "terminal.h"
|
||
#include "target.h"
|
||
|
||
#ifdef USG
|
||
#include <sys/types.h>
|
||
#endif
|
||
|
||
/* Some USG-esque systems (some of which are BSD-esque enough so that USG
|
||
is not defined) want this header, and it won't do any harm. */
|
||
#include <fcntl.h>
|
||
|
||
#include <sys/param.h>
|
||
#include <sys/dir.h>
|
||
#include <signal.h>
|
||
|
||
extern struct target_ops child_ops;
|
||
|
||
/* Nonzero if we are debugging an attached outside process
|
||
rather than an inferior. */
|
||
|
||
int attach_flag;
|
||
|
||
|
||
/* Record terminal status separately for debugger and inferior. */
|
||
|
||
static TERMINAL sg_inferior;
|
||
static TERMINAL sg_ours;
|
||
|
||
static int tflags_inferior;
|
||
static int tflags_ours;
|
||
|
||
#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
|
||
static struct tchars tc_inferior;
|
||
static struct tchars tc_ours;
|
||
#endif
|
||
|
||
#ifdef TIOCGLTC
|
||
static struct ltchars ltc_inferior;
|
||
static struct ltchars ltc_ours;
|
||
#endif
|
||
|
||
#ifdef TIOCLGET
|
||
static int lmode_inferior;
|
||
static int lmode_ours;
|
||
#endif
|
||
|
||
#ifdef TIOCGPGRP
|
||
static int pgrp_inferior;
|
||
static int pgrp_ours;
|
||
#else
|
||
static void (*sigint_ours) ();
|
||
static void (*sigquit_ours) ();
|
||
#endif /* TIOCGPGRP */
|
||
|
||
/* Copy of inferior_io_terminal when inferior was last started. */
|
||
static char *inferior_thisrun_terminal;
|
||
|
||
static void terminal_ours_1 ();
|
||
|
||
/* Nonzero if our terminal settings are in effect.
|
||
Zero if the inferior's settings are in effect. */
|
||
static int terminal_is_ours;
|
||
|
||
/* Initialize the terminal settings we record for the inferior,
|
||
before we actually run the inferior. */
|
||
|
||
void
|
||
terminal_init_inferior ()
|
||
{
|
||
sg_inferior = sg_ours;
|
||
tflags_inferior = tflags_ours;
|
||
|
||
#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
|
||
tc_inferior = tc_ours;
|
||
#endif
|
||
|
||
#ifdef TIOCGLTC
|
||
ltc_inferior = ltc_ours;
|
||
#endif
|
||
|
||
#ifdef TIOCLGET
|
||
lmode_inferior = lmode_ours;
|
||
#endif
|
||
|
||
#ifdef TIOCGPGRP
|
||
pgrp_inferior = inferior_pid;
|
||
#endif /* TIOCGPGRP */
|
||
|
||
terminal_is_ours = 1;
|
||
}
|
||
|
||
/* Put the inferior's terminal settings into effect.
|
||
This is preparation for starting or resuming the inferior. */
|
||
|
||
void
|
||
terminal_inferior ()
|
||
{
|
||
if (terminal_is_ours && inferior_thisrun_terminal == 0)
|
||
{
|
||
fcntl (0, F_SETFL, tflags_inferior);
|
||
fcntl (0, F_SETFL, tflags_inferior);
|
||
ioctl (0, TIOCSETN, &sg_inferior);
|
||
|
||
#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
|
||
ioctl (0, TIOCSETC, &tc_inferior);
|
||
#endif
|
||
#ifdef TIOCGLTC
|
||
ioctl (0, TIOCSLTC, <c_inferior);
|
||
#endif
|
||
#ifdef TIOCLGET
|
||
ioctl (0, TIOCLSET, &lmode_inferior);
|
||
#endif
|
||
|
||
#ifdef TIOCGPGRP
|
||
ioctl (0, TIOCSPGRP, &pgrp_inferior);
|
||
#else
|
||
sigint_ours = (void (*) ()) signal (SIGINT, SIG_IGN);
|
||
sigquit_ours = (void (*) ()) signal (SIGQUIT, SIG_IGN);
|
||
#endif /* TIOCGPGRP */
|
||
}
|
||
terminal_is_ours = 0;
|
||
}
|
||
|
||
/* Put some of our terminal settings into effect,
|
||
enough to get proper results from our output,
|
||
but do not change into or out of RAW mode
|
||
so that no input is discarded.
|
||
|
||
After doing this, either terminal_ours or terminal_inferior
|
||
should be called to get back to a normal state of affairs. */
|
||
|
||
void
|
||
terminal_ours_for_output ()
|
||
{
|
||
terminal_ours_1 (1);
|
||
}
|
||
|
||
/* Put our terminal settings into effect.
|
||
First record the inferior's terminal settings
|
||
so they can be restored properly later. */
|
||
|
||
void
|
||
terminal_ours ()
|
||
{
|
||
terminal_ours_1 (0);
|
||
}
|
||
|
||
static void
|
||
terminal_ours_1 (output_only)
|
||
int output_only;
|
||
{
|
||
#ifdef TIOCGPGRP
|
||
/* Ignore this signal since it will happen when we try to set the pgrp. */
|
||
void (*osigttou) ();
|
||
#endif /* TIOCGPGRP */
|
||
|
||
/* The check for inferior_thisrun_terminal had been commented out
|
||
when the call to ioctl (TIOCNOTTY) was commented out.
|
||
Checking inferior_thisrun_terminal is necessary so that
|
||
if GDB is running in the background, it won't block trying
|
||
to do the ioctl()'s below. */
|
||
if (inferior_thisrun_terminal != 0)
|
||
return;
|
||
|
||
if (!terminal_is_ours)
|
||
{
|
||
terminal_is_ours = 1;
|
||
|
||
#ifdef TIOCGPGRP
|
||
osigttou = (void (*) ()) signal (SIGTTOU, SIG_IGN);
|
||
|
||
ioctl (0, TIOCGPGRP, &pgrp_inferior);
|
||
ioctl (0, TIOCSPGRP, &pgrp_ours);
|
||
|
||
signal (SIGTTOU, osigttou);
|
||
#else
|
||
signal (SIGINT, sigint_ours);
|
||
signal (SIGQUIT, sigquit_ours);
|
||
#endif /* TIOCGPGRP */
|
||
|
||
tflags_inferior = fcntl (0, F_GETFL, 0);
|
||
ioctl (0, TIOCGETP, &sg_inferior);
|
||
|
||
#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
|
||
ioctl (0, TIOCGETC, &tc_inferior);
|
||
#endif
|
||
#ifdef TIOCGLTC
|
||
ioctl (0, TIOCGLTC, <c_inferior);
|
||
#endif
|
||
#ifdef TIOCLGET
|
||
ioctl (0, TIOCLGET, &lmode_inferior);
|
||
#endif
|
||
}
|
||
|
||
#ifdef HAVE_TERMIO
|
||
sg_ours.c_lflag |= ICANON;
|
||
if (output_only && !(sg_inferior.c_lflag & ICANON))
|
||
sg_ours.c_lflag &= ~ICANON;
|
||
#else /* not HAVE_TERMIO */
|
||
sg_ours.sg_flags &= ~RAW & ~CBREAK;
|
||
if (output_only)
|
||
sg_ours.sg_flags |= (RAW | CBREAK) & sg_inferior.sg_flags;
|
||
#endif /* not HAVE_TERMIO */
|
||
|
||
fcntl (0, F_SETFL, tflags_ours);
|
||
fcntl (0, F_SETFL, tflags_ours);
|
||
ioctl (0, TIOCSETN, &sg_ours);
|
||
|
||
#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
|
||
ioctl (0, TIOCSETC, &tc_ours);
|
||
#endif
|
||
#ifdef TIOCGLTC
|
||
ioctl (0, TIOCSLTC, <c_ours);
|
||
#endif
|
||
#ifdef TIOCLGET
|
||
ioctl (0, TIOCLSET, &lmode_ours);
|
||
#endif
|
||
|
||
#ifdef HAVE_TERMIO
|
||
sg_ours.c_lflag |= ICANON;
|
||
#else /* not HAVE_TERMIO */
|
||
sg_ours.sg_flags &= ~RAW & ~CBREAK;
|
||
#endif /* not HAVE_TERMIO */
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
void
|
||
term_info (arg, from_tty)
|
||
char *arg;
|
||
int from_tty;
|
||
{
|
||
target_terminal_info (arg, from_tty);
|
||
}
|
||
|
||
void
|
||
child_terminal_info (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
register int i;
|
||
|
||
printf_filtered ("Inferior's terminal status (currently saved by GDB):\n");
|
||
|
||
#ifdef HAVE_TERMIO
|
||
|
||
printf_filtered ("fcntl flags = 0x%x, c_iflag = 0x%x, c_oflag = 0x%x,\n",
|
||
tflags_inferior, sg_inferior.c_iflag, sg_inferior.c_oflag);
|
||
printf_filtered ("c_cflag = 0x%x, c_lflag = 0x%x, c_line = 0x%x.\n",
|
||
sg_inferior.c_cflag, sg_inferior.c_lflag, sg_inferior.c_line);
|
||
printf_filtered ("c_cc: ");
|
||
for (i = 0; (i < NCC); i += 1)
|
||
printf_filtered ("0x%x ", sg_inferior.c_cc[i]);
|
||
printf_filtered ("\n");
|
||
|
||
#else /* not HAVE_TERMIO */
|
||
|
||
printf_filtered ("fcntl flags = 0x%x, sgttyb.sg_flags = 0x%x, owner pid = %d.\n",
|
||
tflags_inferior, sg_inferior.sg_flags, pgrp_inferior);
|
||
|
||
#endif /* not HAVE_TERMIO */
|
||
|
||
#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
|
||
printf_filtered ("tchars: ");
|
||
for (i = 0; i < (int)sizeof (struct tchars); i++)
|
||
printf_filtered ("0x%x ", ((char *)&tc_inferior)[i]);
|
||
printf_filtered ("\n");
|
||
#endif
|
||
|
||
#ifdef TIOCGLTC
|
||
printf_filtered ("ltchars: ");
|
||
for (i = 0; i < (int)sizeof (struct ltchars); i++)
|
||
printf_filtered ("0x%x ", ((char *)<c_inferior)[i]);
|
||
printf_filtered ("\n");
|
||
#endif
|
||
|
||
#ifdef TIOCLGET
|
||
printf_filtered ("lmode: 0x%x\n", lmode_inferior);
|
||
#endif
|
||
}
|
||
|
||
/* NEW_TTY is called in new child processes under Unix, which will
|
||
become debugger target processes.
|
||
If the TTYNAME argument is non-null, we switch to that tty for further
|
||
input and output. In either case, we remember the setup. */
|
||
|
||
void
|
||
new_tty (ttyname)
|
||
char *ttyname;
|
||
{
|
||
register int tty;
|
||
|
||
/* Save the name for later, for determining whether we and the child
|
||
are sharing a tty. */
|
||
inferior_thisrun_terminal = ttyname;
|
||
if (ttyname == 0)
|
||
return;
|
||
|
||
#ifdef TIOCNOTTY
|
||
/* Disconnect the child process from our controlling terminal. */
|
||
tty = open("/dev/tty", O_RDWR);
|
||
if (tty > 0)
|
||
{
|
||
ioctl(tty, TIOCNOTTY, 0);
|
||
close(tty);
|
||
}
|
||
#endif
|
||
|
||
/* Now open the specified new terminal. */
|
||
|
||
tty = open(ttyname, O_RDWR);
|
||
if (tty == -1)
|
||
{
|
||
print_sys_errmsg (ttyname, errno);
|
||
_exit(1);
|
||
}
|
||
|
||
/* Avoid use of dup2; doesn't exist on all systems. */
|
||
if (tty != 0)
|
||
{ close (0); dup (tty); }
|
||
if (tty != 1)
|
||
{ close (1); dup (tty); }
|
||
if (tty != 2)
|
||
{ close (2); dup (tty); }
|
||
if (tty > 2)
|
||
close(tty);
|
||
}
|
||
|
||
/* Kill the inferior process. Make us have no inferior. */
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
kill_command (arg, from_tty)
|
||
char *arg;
|
||
int from_tty;
|
||
{
|
||
if (inferior_pid == 0)
|
||
error ("The program is not being run.");
|
||
if (!query ("Kill the inferior process? "))
|
||
error ("Not confirmed.");
|
||
target_kill (arg, from_tty);
|
||
}
|
||
|
||
/* The inferior process has died. Long live the inferior! */
|
||
|
||
void
|
||
generic_mourn_inferior ()
|
||
{
|
||
inferior_pid = 0;
|
||
attach_flag = 0;
|
||
mark_breakpoints_out ();
|
||
registers_changed ();
|
||
|
||
#ifdef CLEAR_DEFERRED_STORES
|
||
/* Delete any pending stores to the inferior... */
|
||
CLEAR_DEFERRED_STORES;
|
||
#endif
|
||
|
||
select_frame ((FRAME) 0, -1);
|
||
reopen_exec_file ();
|
||
if (target_has_stack)
|
||
set_current_frame ( create_new_frame (read_register (FP_REGNUM),
|
||
read_pc ()));
|
||
else
|
||
set_current_frame (0);
|
||
/* It is confusing to the user for ignore counts to stick around
|
||
from previous runs of the inferior. So clear them. */
|
||
breakpoint_clear_ignore_counts ();
|
||
}
|
||
|
||
void
|
||
child_mourn_inferior ()
|
||
{
|
||
unpush_target (&child_ops);
|
||
generic_mourn_inferior ();
|
||
}
|
||
|
||
#if 0
|
||
/* This function is just for testing, and on some systems (Sony NewsOS
|
||
3.2) <sys/user.h> also includes <sys/time.h> which leads to errors
|
||
(since on this system at least sys/time.h is not protected against
|
||
multiple inclusion). */
|
||
/* ARGSUSED */
|
||
static void
|
||
try_writing_regs_command (arg, from_tty)
|
||
char *arg;
|
||
int from_tty;
|
||
{
|
||
register int i;
|
||
register int value;
|
||
|
||
if (inferior_pid == 0)
|
||
error ("There is no inferior process now.");
|
||
|
||
/* A Sun 3/50 or 3/60 (at least) running SunOS 4.0.3 will have a
|
||
kernel panic if we try to write past the end of the user area.
|
||
Presumably Sun will fix this bug (it has been reported), but it
|
||
is tacky to crash the system, so at least on SunOS4 we need to
|
||
stop writing when we hit the end of the user area. */
|
||
for (i = 0; i < sizeof (struct user); i += 2)
|
||
{
|
||
QUIT;
|
||
errno = 0;
|
||
value = call_ptrace (3, inferior_pid, i, 0);
|
||
call_ptrace (6, inferior_pid, i, value);
|
||
if (errno == 0)
|
||
{
|
||
printf (" Succeeded with address 0x%x; value 0x%x (%d).\n",
|
||
i, value, value);
|
||
}
|
||
else if ((i & 0377) == 0)
|
||
printf (" Failed at 0x%x.\n", i);
|
||
}
|
||
}
|
||
#endif
|
||
|
||
void
|
||
_initialize_inflow ()
|
||
{
|
||
add_info ("terminal", term_info,
|
||
"Print inferior's saved terminal status.");
|
||
|
||
#if 0
|
||
add_com ("try-writing-regs", class_obscure, try_writing_regs_command,
|
||
"Try writing all locations in inferior's system block.\n\
|
||
Report which ones can be written.");
|
||
#endif
|
||
|
||
add_com ("kill", class_run, kill_command,
|
||
"Kill execution of program being debugged.");
|
||
|
||
inferior_pid = 0;
|
||
|
||
ioctl (0, TIOCGETP, &sg_ours);
|
||
fcntl (0, F_GETFL, tflags_ours);
|
||
|
||
#if defined(TIOCGETC) && !defined(TIOCGETC_BROKEN)
|
||
ioctl (0, TIOCGETC, &tc_ours);
|
||
#endif
|
||
#ifdef TIOCGLTC
|
||
ioctl (0, TIOCGLTC, <c_ours);
|
||
#endif
|
||
#ifdef TIOCLGET
|
||
ioctl (0, TIOCLGET, &lmode_ours);
|
||
#endif
|
||
|
||
#ifdef TIOCGPGRP
|
||
ioctl (0, TIOCGPGRP, &pgrp_ours);
|
||
#endif /* TIOCGPGRP */
|
||
|
||
terminal_is_ours = 1;
|
||
}
|
||
|