mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-12-05 19:07:07 +00:00
836e343b01
* target.h: Comments on target_attach args and results. * infcmd.c (attach_command): Check for existing execution, call target_attach, set up terminal status and wait_for_inferior, wait for the attach status, and do normal_stop. * inftarg.c (child_attach): Remove target independent stuff. * remote-adapt.c (adapt_attach): Ditto. * remote-mm.c (mm_attach): Ditto. * remote-udi.c (udi_attach): Ditto. * remote-vx.c (vx_attach): Ditto. Cleanup. * remote-hms.c (hms_attach): Remove completely, it was useless. * remote-mm.c, remote-hms.c, remote-udi.c, remote-adapt.c: Remove commented-out start_remote calls. * remote-hms.c, remote-adapt.c, remote-mm.c, remote-udi.c: Remove DENTER and DEXIT macros and their calls. Use a real debugger -- like gdb -- to see what functions are being called when.
485 lines
13 KiB
C
485 lines
13 KiB
C
/* Target-vector operations for controlling Unix child processes, for GDB.
|
||
Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
|
||
Contributed by Cygnus Support.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program 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 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program 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 this program; if not, write to the Free Software
|
||
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "frame.h" /* required by inferior.h */
|
||
#include "inferior.h"
|
||
#include "target.h"
|
||
#include "wait.h"
|
||
#include "gdbcore.h"
|
||
#include "ieee-float.h" /* Required by REGISTER_CONVERT_TO_XXX */
|
||
#include "terminal.h" /* For #ifdef TIOCGPGRP and new_tty */
|
||
|
||
#include <signal.h>
|
||
|
||
#ifdef SET_STACK_LIMIT_HUGE
|
||
#include <sys/time.h>
|
||
#include <sys/resource.h>
|
||
|
||
extern int original_stack_limit;
|
||
#endif /* SET_STACK_LIMIT_HUGE */
|
||
|
||
static void
|
||
child_prepare_to_store PARAMS ((void));
|
||
|
||
static int
|
||
child_wait PARAMS ((int *));
|
||
|
||
static void
|
||
child_open PARAMS ((char *, int));
|
||
|
||
static void
|
||
child_files_info PARAMS ((struct target_ops *));
|
||
|
||
static void
|
||
child_detach PARAMS ((char *, int));
|
||
|
||
static void
|
||
child_attach PARAMS ((char *, int));
|
||
|
||
static void
|
||
child_create_inferior PARAMS ((char *, char *, char **));
|
||
|
||
static void
|
||
child_mourn_inferior PARAMS ((void));
|
||
|
||
static int
|
||
child_can_run PARAMS ((void));
|
||
|
||
extern char **environ;
|
||
|
||
/* Forward declaration */
|
||
extern struct target_ops child_ops;
|
||
|
||
/* Wait for child to do something. Return pid of child, or -1 in case
|
||
of error; store status through argument pointer STATUS. */
|
||
|
||
static int
|
||
child_wait (status)
|
||
int *status;
|
||
{
|
||
int pid;
|
||
|
||
do {
|
||
#ifdef USE_PROC_FS
|
||
pid = proc_wait (status);
|
||
#else
|
||
pid = wait (status);
|
||
#endif
|
||
if (pid == -1) /* No more children to wait for */
|
||
{
|
||
fprintf (stderr, "Child process unexpectedly missing.\n");
|
||
*status = 42; /* Claim it exited with signal 42 */
|
||
return -1;
|
||
}
|
||
} while (pid != inferior_pid); /* Some other child died or stopped */
|
||
return pid;
|
||
}
|
||
|
||
|
||
/* Attach to process PID, then initialize for debugging it. */
|
||
|
||
static void
|
||
child_attach (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
char *exec_file;
|
||
int pid;
|
||
|
||
if (!args)
|
||
error_no_arg ("process-id to attach");
|
||
|
||
#ifndef ATTACH_DETACH
|
||
error ("Can't attach to a process on this machine.");
|
||
#else
|
||
pid = atoi (args);
|
||
|
||
if (pid == getpid()) /* Trying to masturbate? */
|
||
error ("I refuse to debug myself!");
|
||
|
||
if (from_tty)
|
||
{
|
||
exec_file = (char *) get_exec_file (0);
|
||
|
||
if (exec_file)
|
||
printf ("Attaching program `%s', pid %d\n", exec_file, pid);
|
||
else
|
||
printf ("Attaching pid %d\n", pid);
|
||
|
||
fflush (stdout);
|
||
}
|
||
|
||
attach (pid);
|
||
inferior_pid = pid;
|
||
push_target (&child_ops);
|
||
#endif /* ATTACH_DETACH */
|
||
}
|
||
|
||
|
||
/* Take a program previously attached to and detaches it.
|
||
The program resumes execution and will no longer stop
|
||
on signals, etc. We'd better not have left any breakpoints
|
||
in the program or it'll die when it hits one. For this
|
||
to work, it may be necessary for the process to have been
|
||
previously attached. It *might* work if the program was
|
||
started via the normal ptrace (PTRACE_TRACEME). */
|
||
|
||
static void
|
||
child_detach (args, from_tty)
|
||
char *args;
|
||
int from_tty;
|
||
{
|
||
int siggnal = 0;
|
||
|
||
#ifdef ATTACH_DETACH
|
||
if (from_tty)
|
||
{
|
||
char *exec_file = get_exec_file (0);
|
||
if (exec_file == 0)
|
||
exec_file = "";
|
||
printf ("Detaching program: %s pid %d\n",
|
||
exec_file, inferior_pid);
|
||
fflush (stdout);
|
||
}
|
||
if (args)
|
||
siggnal = atoi (args);
|
||
|
||
detach (siggnal);
|
||
inferior_pid = 0;
|
||
unpush_target (&child_ops); /* Pop out of handling an inferior */
|
||
#else
|
||
error ("This version of Unix does not support detaching a process.");
|
||
#endif
|
||
}
|
||
|
||
/* Get ready to modify the registers array. On machines which store
|
||
individual registers, this doesn't need to do anything. On machines
|
||
which store all the registers in one fell swoop, this makes sure
|
||
that registers contains all the registers from the program being
|
||
debugged. */
|
||
|
||
static void
|
||
child_prepare_to_store ()
|
||
{
|
||
#ifdef CHILD_PREPARE_TO_STORE
|
||
CHILD_PREPARE_TO_STORE ();
|
||
#endif
|
||
}
|
||
|
||
/* Print status information about what we're accessing. */
|
||
|
||
static void
|
||
child_files_info (ignore)
|
||
struct target_ops *ignore;
|
||
{
|
||
printf ("\tUsing the running image of %s process %d.\n",
|
||
attach_flag? "attached": "child", inferior_pid);
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
child_open (arg, from_tty)
|
||
char *arg;
|
||
int from_tty;
|
||
{
|
||
error ("Use the \"run\" command to start a Unix child process.");
|
||
}
|
||
|
||
/* Start an inferior Unix child process and sets inferior_pid to its pid.
|
||
EXEC_FILE is the file to run.
|
||
ALLARGS is a string containing the arguments to the program.
|
||
ENV is the environment vector to pass. Errors reported with error(). */
|
||
|
||
#ifndef SHELL_FILE
|
||
#define SHELL_FILE "/bin/sh"
|
||
#endif
|
||
|
||
static void
|
||
child_create_inferior (exec_file, allargs, env)
|
||
char *exec_file;
|
||
char *allargs;
|
||
char **env;
|
||
{
|
||
int pid;
|
||
char *shell_command;
|
||
char *shell_file;
|
||
static char default_shell_file[] = SHELL_FILE;
|
||
int len;
|
||
int pending_execs;
|
||
/* Set debug_fork then attach to the child while it sleeps, to debug. */
|
||
static int debug_fork = 0;
|
||
/* This is set to the result of setpgrp, which if vforked, will be visible
|
||
to you in the parent process. It's only used by humans for debugging. */
|
||
static int debug_setpgrp = 657473;
|
||
char **save_our_env;
|
||
|
||
/* If no exec file handed to us, get it from the exec-file command -- with
|
||
a good, common error message if none is specified. */
|
||
if (exec_file == 0)
|
||
exec_file = get_exec_file(1);
|
||
|
||
/* The user might want tilde-expansion, and in general probably wants
|
||
the program to behave the same way as if run from
|
||
his/her favorite shell. So we let the shell run it for us.
|
||
FIXME, this should probably search the local environment (as
|
||
modified by the setenv command), not the env gdb inherited. */
|
||
shell_file = getenv ("SHELL");
|
||
if (shell_file == NULL)
|
||
shell_file = default_shell_file;
|
||
|
||
len = 5 + strlen (exec_file) + 1 + strlen (allargs) + 1 + /*slop*/ 10;
|
||
/* If desired, concat something onto the front of ALLARGS.
|
||
SHELL_COMMAND is the result. */
|
||
#ifdef SHELL_COMMAND_CONCAT
|
||
shell_command = (char *) alloca (strlen (SHELL_COMMAND_CONCAT) + len);
|
||
strcpy (shell_command, SHELL_COMMAND_CONCAT);
|
||
#else
|
||
shell_command = (char *) alloca (len);
|
||
shell_command[0] = '\0';
|
||
#endif
|
||
strcat (shell_command, "exec ");
|
||
strcat (shell_command, exec_file);
|
||
strcat (shell_command, " ");
|
||
strcat (shell_command, allargs);
|
||
|
||
/* exec is said to fail if the executable is open. */
|
||
close_exec_file ();
|
||
|
||
/* Retain a copy of our environment variables, since the child will
|
||
replace the value of environ and if we're vforked, we have to
|
||
restore it. */
|
||
save_our_env = environ;
|
||
|
||
/* Tell the terminal handling subsystem what tty we plan to run on;
|
||
it will just record the information for later. */
|
||
|
||
new_tty_prefork (inferior_io_terminal);
|
||
|
||
/* It is generally good practice to flush any possible pending stdio
|
||
output prior to doing a fork, to avoid the possibility of both the
|
||
parent and child flushing the same data after the fork. */
|
||
|
||
fflush (stdout);
|
||
fflush (stderr);
|
||
|
||
#if defined(USG) && !defined(HAVE_VFORK)
|
||
pid = fork ();
|
||
#else
|
||
if (debug_fork)
|
||
pid = fork ();
|
||
else
|
||
pid = vfork ();
|
||
#endif
|
||
|
||
if (pid < 0)
|
||
perror_with_name ("vfork");
|
||
|
||
if (pid == 0)
|
||
{
|
||
if (debug_fork)
|
||
sleep (debug_fork);
|
||
|
||
#ifdef TIOCGPGRP
|
||
/* Run inferior in a separate process group. */
|
||
#ifdef NEED_POSIX_SETPGID
|
||
debug_setpgrp = setpgid (0, 0);
|
||
#else
|
||
#if defined(USG) && !defined(SETPGRP_ARGS)
|
||
debug_setpgrp = setpgrp ();
|
||
#else
|
||
debug_setpgrp = setpgrp (getpid (), getpid ());
|
||
#endif /* USG */
|
||
#endif /* NEED_POSIX_SETPGID */
|
||
if (debug_setpgrp == -1)
|
||
perror("setpgrp failed in child");
|
||
#endif /* TIOCGPGRP */
|
||
|
||
#ifdef SET_STACK_LIMIT_HUGE
|
||
/* Reset the stack limit back to what it was. */
|
||
{
|
||
struct rlimit rlim;
|
||
|
||
getrlimit (RLIMIT_STACK, &rlim);
|
||
rlim.rlim_cur = original_stack_limit;
|
||
setrlimit (RLIMIT_STACK, &rlim);
|
||
}
|
||
#endif /* SET_STACK_LIMIT_HUGE */
|
||
|
||
/* Ask the tty subsystem to switch to the one we specified earlier
|
||
(or to share the current terminal, if none was specified). */
|
||
|
||
new_tty ();
|
||
|
||
/* Changing the signal handlers for the inferior after
|
||
a vfork can also change them for the superior, so we don't mess
|
||
with signals here. See comments in
|
||
initialize_signals for how we get the right signal handlers
|
||
for the inferior. */
|
||
|
||
#ifdef USE_PROC_FS
|
||
/* Use SVR4 /proc interface */
|
||
proc_set_exec_trap ();
|
||
#else
|
||
/* "Trace me, Dr. Memory!" */
|
||
call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0);
|
||
#endif
|
||
|
||
/* There is no execlpe call, so we have to set the environment
|
||
for our child in the global variable. If we've vforked, this
|
||
clobbers the parent, but environ is restored a few lines down
|
||
in the parent. By the way, yes we do need to look down the
|
||
path to find $SHELL. Rich Pixley says so, and I agree. */
|
||
environ = env;
|
||
execlp (shell_file, shell_file, "-c", shell_command, (char *)0);
|
||
|
||
fprintf (stderr, "Cannot exec %s: %s.\n", shell_file,
|
||
safe_strerror (errno));
|
||
fflush (stderr);
|
||
_exit (0177);
|
||
}
|
||
|
||
/* Restore our environment in case a vforked child clob'd it. */
|
||
environ = save_our_env;
|
||
|
||
/* Now that we have a child process, make it our target. */
|
||
push_target (&child_ops);
|
||
|
||
#ifdef CREATE_INFERIOR_HOOK
|
||
CREATE_INFERIOR_HOOK (pid);
|
||
#endif
|
||
|
||
/* The process was started by the fork that created it,
|
||
but it will have stopped one instruction after execing the shell.
|
||
Here we must get it up to actual execution of the real program. */
|
||
|
||
inferior_pid = pid; /* Needed for wait_for_inferior stuff below */
|
||
|
||
clear_proceed_status ();
|
||
|
||
/* We will get a trace trap after one instruction.
|
||
Continue it automatically. Eventually (after shell does an exec)
|
||
it will get another trace trap. Then insert breakpoints and continue. */
|
||
|
||
#ifdef START_INFERIOR_TRAPS_EXPECTED
|
||
pending_execs = START_INFERIOR_TRAPS_EXPECTED;
|
||
#else
|
||
pending_execs = 2;
|
||
#endif
|
||
|
||
init_wait_for_inferior ();
|
||
|
||
/* Set up the "saved terminal modes" of the inferior
|
||
based on what modes we are starting it with. */
|
||
target_terminal_init ();
|
||
|
||
/* Install inferior's terminal modes. */
|
||
target_terminal_inferior ();
|
||
|
||
while (1)
|
||
{
|
||
stop_soon_quietly = 1; /* Make wait_for_inferior be quiet */
|
||
wait_for_inferior ();
|
||
if (stop_signal != SIGTRAP)
|
||
{
|
||
/* Let shell child handle its own signals in its own way */
|
||
/* FIXME, what if child has exit()ed? Must exit loop somehow */
|
||
resume (0, stop_signal);
|
||
}
|
||
else
|
||
{
|
||
/* We handle SIGTRAP, however; it means child did an exec. */
|
||
if (0 == --pending_execs)
|
||
break;
|
||
resume (0, 0); /* Just make it go on */
|
||
}
|
||
}
|
||
stop_soon_quietly = 0;
|
||
|
||
/* We are now in the child process of interest, having exec'd the
|
||
correct program, and are poised at the first instruction of the
|
||
new program. */
|
||
#ifdef SOLIB_CREATE_INFERIOR_HOOK
|
||
SOLIB_CREATE_INFERIOR_HOOK (pid);
|
||
#endif
|
||
|
||
/* Pedal to the metal. Away we go. */
|
||
proceed ((CORE_ADDR) -1, 0, 0);
|
||
}
|
||
|
||
static void
|
||
child_mourn_inferior ()
|
||
{
|
||
unpush_target (&child_ops);
|
||
generic_mourn_inferior ();
|
||
}
|
||
|
||
static int
|
||
child_can_run ()
|
||
{
|
||
return(1);
|
||
}
|
||
|
||
struct target_ops child_ops = {
|
||
"child", /* to_shortname */
|
||
"Unix child process", /* to_longname */
|
||
"Unix child process (started by the \"run\" command).", /* to_doc */
|
||
child_open, /* to_open */
|
||
0, /* to_close */
|
||
child_attach, /* to_attach */
|
||
child_detach, /* to_detach */
|
||
child_resume, /* to_resume */
|
||
child_wait, /* to_wait */
|
||
fetch_inferior_registers, /* to_fetch_registers */
|
||
store_inferior_registers, /* to_store_registers */
|
||
child_prepare_to_store, /* to_prepare_to_store */
|
||
child_xfer_memory, /* to_xfer_memory */
|
||
child_files_info, /* to_files_info */
|
||
memory_insert_breakpoint, /* to_insert_breakpoint */
|
||
memory_remove_breakpoint, /* to_remove_breakpoint */
|
||
terminal_init_inferior, /* to_terminal_init */
|
||
terminal_inferior, /* to_terminal_inferior */
|
||
terminal_ours_for_output, /* to_terminal_ours_for_output */
|
||
terminal_ours, /* to_terminal_ours */
|
||
child_terminal_info, /* to_terminal_info */
|
||
kill_inferior, /* to_kill */
|
||
0, /* to_load */
|
||
0, /* to_lookup_symbol */
|
||
child_create_inferior, /* to_create_inferior */
|
||
child_mourn_inferior, /* to_mourn_inferior */
|
||
child_can_run, /* to_can_run */
|
||
process_stratum, /* to_stratum */
|
||
0, /* to_next */
|
||
1, /* to_has_all_memory */
|
||
1, /* to_has_memory */
|
||
1, /* to_has_stack */
|
||
1, /* to_has_registers */
|
||
1, /* to_has_execution */
|
||
0, /* sections */
|
||
0, /* sections_end */
|
||
OPS_MAGIC /* to_magic */
|
||
};
|
||
|
||
void
|
||
_initialize_inftarg ()
|
||
{
|
||
add_target (&child_ops);
|
||
}
|