binutils-gdb/gdb/inftarg.c

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/* Target-vector operations for controlling Unix child processes, for GDB.
Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999,
2000, 2002, 2003 Free Software Foundation, Inc.
Contributed by Cygnus Support.
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## Contains temporary hacks..
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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
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.
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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.
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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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
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#include "frame.h" /* required by inferior.h */
#include "inferior.h"
#include "target.h"
#include "gdbcore.h"
#include "command.h"
#include "gdb_stat.h"
#include <signal.h>
#include <sys/types.h>
#include <fcntl.h>
#include "gdb_wait.h"
#include "inflow.h"
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extern struct symtab_and_line *child_enable_exception_callback (enum
exception_event_kind,
int);
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extern struct exception_event_record
*child_get_current_exception_event (void);
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extern void _initialize_inftarg (void);
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static void child_prepare_to_store (void);
#ifndef CHILD_WAIT
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static ptid_t child_wait (ptid_t, struct target_waitstatus *);
#endif /* CHILD_WAIT */
#if !defined(CHILD_POST_WAIT)
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void child_post_wait (ptid_t, int);
#endif
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static void child_open (char *, int);
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static void child_files_info (struct target_ops *);
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static void child_detach (char *, int);
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static void child_attach (char *, int);
#if !defined(CHILD_POST_ATTACH)
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extern void child_post_attach (int);
#endif
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static void ptrace_me (void);
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static void ptrace_him (int);
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static void child_create_inferior (char *, char *, char **);
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static void child_mourn_inferior (void);
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static int child_can_run (void);
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static void child_stop (void);
#ifndef CHILD_THREAD_ALIVE
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int child_thread_alive (ptid_t);
#endif
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static void init_child_ops (void);
extern char **environ;
struct target_ops child_ops;
int child_suppress_run = 0; /* Non-zero if inftarg should pretend not to
be a runnable target. Used by targets
that can sit atop inftarg, such as HPUX
thread support. */
#ifndef CHILD_WAIT
/* Wait for child to do something. Return pid of child, or -1 in case
of error; store status through argument pointer OURSTATUS. */
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static ptid_t
child_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
{
int save_errno;
int status;
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char *execd_pathname = NULL;
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int exit_status;
int related_pid;
int syscall_id;
enum target_waitkind kind;
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int pid;
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do
{
set_sigint_trap (); /* Causes SIGINT to be passed on to the
attached process. */
set_sigio_trap ();
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pid = ptrace_wait (inferior_ptid, &status);
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save_errno = errno;
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clear_sigio_trap ();
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clear_sigint_trap ();
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if (pid == -1)
{
if (save_errno == EINTR)
continue;
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fprintf_unfiltered (gdb_stderr, "Child process unexpectedly missing: %s.\n",
safe_strerror (save_errno));
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/* Claim it exited with unknown signal. */
ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
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return pid_to_ptid (-1);
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}
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/* Did it exit?
*/
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if (target_has_exited (pid, status, &exit_status))
{
/* ??rehrauer: For now, ignore this. */
continue;
}
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if (!target_thread_alive (pid_to_ptid (pid)))
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{
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
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return pid_to_ptid (pid);
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}
* breakpoint.c (bpstat_stop_status): Call inferior_has_forked, inferior_has_vforked, and inferior_has_execd instead of target_has_forked, target_has_vforked, and target_has_execd. * config/pa/nm-hppah.h (CHILD_HAS_FORKED, CHILD_HAS_VFORKED) (CHILD_HAS_EXECD, CHILD_HAS_SYSCALL_EVENT): Don't define. (CHILD_WAIT): Define. (child_wait): Add prototype. * hppah-nat.c (hpux_has_forked): Rename from child_has_forked. Add prototype. (hpux_has_vforked): Likewise, from child_has_vforked. (hpux_has_execd): Likewise, from child_has_execd. (hpux_has_syscall_event): Likewise, from child_has_syscall_event. (not_same_real_pid, child_wait): New, copied from inftarg.c. Call hpux_has_forked, hpux_has_vforked, hpux_has_execd, and hpux_has_syscall_event instead of the target hooks. * infrun.c (inferior_has_forked, inferior_has_vforked) (inferior_has_execd): New functions. * inftarg.c (not_same_real_pid): Remove. (child_wait): Remove references to not_same_real_pid, target_has_forked, target_has_vforked, target_has_execd, and target_has_syscall_event. (child_has_forked, child_has_vforked, child_has_execd) (child_has_syscall_event): Remove. (init_child_ops): Remove references to child_has_forked, child_has_vforked, child_has_execd, and child_has_syscall_event. * infttrace.c (hpux_has_forked): Rename from child_has_forked. (hpux_has_vforked): Likewise, from child_has_vforked. (hpux_has_execd): Likewise, from child_has_execd. (hpux_has_syscall_event): Likewise, from child_has_syscall_event. * target.c (cleanup_target): Remove references to to_has_forked, to_has_vforked, to_has_execd, and to_has_syscall_event. (update_current_target): Likewise. (setup_target_debug): Likewise. (debug_to_has_forked): Remove. (debug_to_has_vforked): Remove. (debug_to_has_execd): Remove. (debug_to_has_syscall_event): Remove. * target.h (struct target_ops): Remove to_has_forked. to_has_vforked, to_has_execd, and to_has_syscall_event. (child_has_forked, child_has_vforked, child_has_execd) (child_has_syscall_event): Remove prototypes. (inferior_has_forked, inferior_has_vforked, inferior_has_execd): Add prototypes. (target_has_forked, target_has_vforked, target_has_execd) (target_has_syscall_event): Remove macros.
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} while (pid != PIDGET (inferior_ptid)); /* Some other child died or stopped */
store_waitstatus (ourstatus, status);
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return pid_to_ptid (pid);
}
#endif /* CHILD_WAIT */
#if !defined(CHILD_POST_WAIT)
void
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child_post_wait (ptid_t ptid, int wait_status)
{
/* This version of Unix doesn't require a meaningful "post wait"
operation.
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*/
}
#endif
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#ifndef CHILD_THREAD_ALIVE
/* Check to see if the given thread is alive.
FIXME: Is kill() ever the right way to do this? I doubt it, but
for now we're going to try and be compatable with the old thread
code. */
int
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child_thread_alive (ptid_t ptid)
{
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pid_t pid = PIDGET (ptid);
return (kill (pid, 0) != -1);
}
#endif
/* Attach to process PID, then initialize for debugging it. */
static void
child_attach (char *args, int from_tty)
{
if (!args)
error_no_arg ("process-id to attach");
#ifndef ATTACH_DETACH
error ("Can't attach to a process on this machine.");
#else
{
char *exec_file;
int pid;
char *dummy;
dummy = args;
pid = strtol (args, &dummy, 0);
/* Some targets don't set errno on errors, grrr! */
if ((pid == 0) && (args == dummy))
error ("Illegal process-id: %s\n", args);
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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_unfiltered ("Attaching to program: %s, %s\n", exec_file,
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target_pid_to_str (pid_to_ptid (pid)));
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else
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printf_unfiltered ("Attaching to %s\n",
target_pid_to_str (pid_to_ptid (pid)));
gdb_flush (gdb_stdout);
}
attach (pid);
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inferior_ptid = pid_to_ptid (pid);
push_target (&child_ops);
}
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#endif /* ATTACH_DETACH */
}
#if !defined(CHILD_POST_ATTACH)
void
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child_post_attach (int pid)
{
/* This version of Unix doesn't require a meaningful "post attach"
operation by a debugger. */
}
#endif
/* 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 (char *args, int from_tty)
{
#ifdef ATTACH_DETACH
{
int siggnal = 0;
int pid = PIDGET (inferior_ptid);
if (from_tty)
{
char *exec_file = get_exec_file (0);
if (exec_file == 0)
exec_file = "";
printf_unfiltered ("Detaching from program: %s, %s\n", exec_file,
target_pid_to_str (pid_to_ptid (pid)));
gdb_flush (gdb_stdout);
}
if (args)
siggnal = atoi (args);
detach (siggnal);
inferior_ptid = null_ptid;
unpush_target (&child_ops);
}
#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
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child_prepare_to_store (void)
{
#ifdef CHILD_PREPARE_TO_STORE
CHILD_PREPARE_TO_STORE ();
#endif
}
/* Print status information about what we're accessing. */
static void
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child_files_info (struct target_ops *ignore)
{
printf_unfiltered ("\tUsing the running image of %s %s.\n",
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attach_flag ? "attached" : "child", target_pid_to_str (inferior_ptid));
}
/* ARGSUSED */
static void
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child_open (char *arg, int from_tty)
{
error ("Use the \"run\" command to start a Unix child process.");
}
/* Stub function which causes the inferior that runs it, to be ptrace-able
by its parent process. */
static void
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ptrace_me (void)
{
/* "Trace me, Dr. Memory!" */
call_ptrace (0, 0, (PTRACE_ARG3_TYPE) 0, 0);
}
/* Stub function which causes the GDB that runs it, to start ptrace-ing
the child process. */
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static void
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ptrace_him (int pid)
{
push_target (&child_ops);
/* On some targets, there must be some explicit synchronization
between the parent and child processes after the debugger
forks, and before the child execs the debuggee program. This
call basically gives permission for the child to exec.
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*/
target_acknowledge_created_inferior (pid);
/* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h,
* and will be 1 or 2 depending on whether we're starting
* without or with a shell.
*/
startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
/* On some targets, there must be some explicit actions taken after
the inferior has been started up.
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*/
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target_post_startup_inferior (pid_to_ptid (pid));
}
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/* Start an inferior Unix child process and sets inferior_ptid 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(). */
static void
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child_create_inferior (char *exec_file, char *allargs, char **env)
{
#ifdef HPUXHPPA
fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, pre_fork_inferior, NULL);
#else
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fork_inferior (exec_file, allargs, env, ptrace_me, ptrace_him, NULL, NULL);
#endif
/* We are at the first instruction we care about. */
/* Pedal to the metal... */
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proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
}
#if !defined(CHILD_POST_STARTUP_INFERIOR)
void
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child_post_startup_inferior (ptid_t ptid)
{
/* This version of Unix doesn't require a meaningful "post startup inferior"
operation by a debugger.
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*/
}
#endif
#if !defined(CHILD_ACKNOWLEDGE_CREATED_INFERIOR)
void
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child_acknowledge_created_inferior (int pid)
{
/* This version of Unix doesn't require a meaningful "acknowledge created inferior"
operation by a debugger.
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*/
}
#endif
#if !defined(CHILD_INSERT_FORK_CATCHPOINT)
int
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child_insert_fork_catchpoint (int pid)
{
/* This version of Unix doesn't support notification of fork events. */
return 0;
}
#endif
#if !defined(CHILD_REMOVE_FORK_CATCHPOINT)
int
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child_remove_fork_catchpoint (int pid)
{
/* This version of Unix doesn't support notification of fork events. */
return 0;
}
#endif
#if !defined(CHILD_INSERT_VFORK_CATCHPOINT)
int
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child_insert_vfork_catchpoint (int pid)
{
/* This version of Unix doesn't support notification of vfork events. */
return 0;
}
#endif
#if !defined(CHILD_REMOVE_VFORK_CATCHPOINT)
int
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child_remove_vfork_catchpoint (int pid)
{
/* This version of Unix doesn't support notification of vfork events. */
return 0;
}
#endif
#if !defined(CHILD_FOLLOW_FORK)
int
child_follow_fork (int follow_child)
{
/* This version of Unix doesn't support following fork or vfork events. */
return 0;
}
#endif
#if !defined(CHILD_INSERT_EXEC_CATCHPOINT)
int
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child_insert_exec_catchpoint (int pid)
{
/* This version of Unix doesn't support notification of exec events. */
return 0;
}
#endif
#if !defined(CHILD_REMOVE_EXEC_CATCHPOINT)
int
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child_remove_exec_catchpoint (int pid)
{
/* This version of Unix doesn't support notification of exec events. */
return 0;
}
#endif
#if !defined(CHILD_REPORTED_EXEC_EVENTS_PER_EXEC_CALL)
int
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child_reported_exec_events_per_exec_call (void)
{
/* This version of Unix doesn't support notification of exec events.
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*/
return 1;
}
#endif
#if !defined(CHILD_HAS_EXITED)
int
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child_has_exited (int pid, int wait_status, int *exit_status)
{
if (WIFEXITED (wait_status))
{
*exit_status = WEXITSTATUS (wait_status);
return 1;
}
if (WIFSIGNALED (wait_status))
{
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*exit_status = 0; /* ?? Don't know what else to say here. */
return 1;
}
/* ?? Do we really need to consult the event state, too? Assume the
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wait_state alone suffices.
*/
return 0;
}
#endif
static void
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child_mourn_inferior (void)
{
unpush_target (&child_ops);
generic_mourn_inferior ();
}
static int
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child_can_run (void)
{
/* This variable is controlled by modules that sit atop inftarg that may layer
their own process structure atop that provided here. hpux-thread.c does
this because of the Hpux user-mode level thread model. */
return !child_suppress_run;
}
/* Send a SIGINT to the process group. This acts just like the user typed a
^C on the controlling terminal.
XXX - This may not be correct for all systems. Some may want to use
killpg() instead of kill (-pgrp). */
static void
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child_stop (void)
{
kill (-inferior_process_group, SIGINT);
}
#if !defined(CHILD_ENABLE_EXCEPTION_CALLBACK)
struct symtab_and_line *
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child_enable_exception_callback (enum exception_event_kind kind, int enable)
{
return (struct symtab_and_line *) NULL;
}
#endif
#if !defined(CHILD_GET_CURRENT_EXCEPTION_EVENT)
struct exception_event_record *
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child_get_current_exception_event (void)
{
return (struct exception_event_record *) NULL;
}
#endif
#if !defined(CHILD_PID_TO_EXEC_FILE)
char *
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child_pid_to_exec_file (int pid)
{
/* This version of Unix doesn't support translation of a process ID
to the filename of the executable file.
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*/
return NULL;
}
#endif
char *
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child_core_file_to_sym_file (char *core)
{
/* The target stratum for a running executable need not support
this operation.
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*/
return NULL;
}
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#if !defined(CHILD_PID_TO_STR)
char *
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child_pid_to_str (ptid_t ptid)
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{
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return normal_pid_to_str (ptid);
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}
#endif
static void
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init_child_ops (void)
{
child_ops.to_shortname = "child";
child_ops.to_longname = "Unix child process";
child_ops.to_doc = "Unix child process (started by the \"run\" command).";
child_ops.to_open = child_open;
child_ops.to_attach = child_attach;
child_ops.to_post_attach = child_post_attach;
child_ops.to_detach = child_detach;
child_ops.to_resume = child_resume;
child_ops.to_wait = child_wait;
child_ops.to_post_wait = child_post_wait;
child_ops.to_fetch_registers = fetch_inferior_registers;
child_ops.to_store_registers = store_inferior_registers;
child_ops.to_prepare_to_store = child_prepare_to_store;
child_ops.to_xfer_memory = child_xfer_memory;
child_ops.to_files_info = child_files_info;
child_ops.to_insert_breakpoint = memory_insert_breakpoint;
child_ops.to_remove_breakpoint = memory_remove_breakpoint;
child_ops.to_terminal_init = terminal_init_inferior;
child_ops.to_terminal_inferior = terminal_inferior;
child_ops.to_terminal_ours_for_output = terminal_ours_for_output;
child_ops.to_terminal_save_ours = terminal_save_ours;
child_ops.to_terminal_ours = terminal_ours;
child_ops.to_terminal_info = child_terminal_info;
child_ops.to_kill = kill_inferior;
child_ops.to_create_inferior = child_create_inferior;
child_ops.to_post_startup_inferior = child_post_startup_inferior;
child_ops.to_acknowledge_created_inferior = child_acknowledge_created_inferior;
child_ops.to_insert_fork_catchpoint = child_insert_fork_catchpoint;
child_ops.to_remove_fork_catchpoint = child_remove_fork_catchpoint;
child_ops.to_insert_vfork_catchpoint = child_insert_vfork_catchpoint;
child_ops.to_remove_vfork_catchpoint = child_remove_vfork_catchpoint;
child_ops.to_follow_fork = child_follow_fork;
child_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint;
child_ops.to_remove_exec_catchpoint = child_remove_exec_catchpoint;
child_ops.to_reported_exec_events_per_exec_call = child_reported_exec_events_per_exec_call;
child_ops.to_has_exited = child_has_exited;
child_ops.to_mourn_inferior = child_mourn_inferior;
child_ops.to_can_run = child_can_run;
child_ops.to_thread_alive = child_thread_alive;
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child_ops.to_pid_to_str = child_pid_to_str;
child_ops.to_stop = child_stop;
child_ops.to_enable_exception_callback = child_enable_exception_callback;
child_ops.to_get_current_exception_event = child_get_current_exception_event;
child_ops.to_pid_to_exec_file = child_pid_to_exec_file;
child_ops.to_stratum = process_stratum;
child_ops.to_has_all_memory = 1;
child_ops.to_has_memory = 1;
child_ops.to_has_stack = 1;
child_ops.to_has_registers = 1;
child_ops.to_has_execution = 1;
child_ops.to_magic = OPS_MAGIC;
}
2002-01-03 Michael Snyder <msnyder@redhat.com> Implement a "generate-core-file" command in gdb, save target state. * gcore.c: New file. Implement new command 'generate-core-file'. Save a corefile image of the current state of the inferior. * linux-proc.c: Add linux-specific code for saving corefiles. * target.h (struct target_ops): Add new target vectors for saving corefiles; to_find_memory_regions and to_make_corefile_notes. (target_find_memory_regions): New macro. (target_make_corefile_notes): New macro. * target.c (update_current_target): Inherit new target methods. (dummy_find_memory_regions): New place-holder method. (dummy_make_corefile_notes): New place-holder method. (init_dummy_target): Initialize new dummy target vectors. * exec.c (exec_set_find_memory_regions): New function. Allow the exec_ops vector for memory regions to be taken over. (exec_make_note_section): New function, target vector method. * defs.h (exec_set_find_memory_regions): Export prototype. * procfs.c (proc_find_memory_regions): New function, corefile method. (procfs_make_note_section): New function, corefile method. (init_procfs_ops): Set new target vector pointers. (find_memory_regions_callback): New function. (procfs_do_thread_registers): New function. (procfs_corefile_thread_callback): New function. * sol-thread.c (sol_find_memory_regions): New function. (sol_make_note_section): New function. (init_sol_thread_ops): Initialize new target vectors. * inftarg.c (inftarg_set_find_memory_regions): New function. Allow to_find_memory_regions vector to be taken over. (inftarg_set_make_corefile_notes): New function. Allow to_make_corefile_notes vector to be taken over. * thread-db.c (thread_db_new_objfile): Don't activate thread-db interface layer if not target_has_execution (may be a corefile). * config/i386/linux.mh: Add gcore.o to NATDEPFILES. * config/sparc/sun4sol2.mh: Ditto. * config/alpha/alpha-linux.mh: Ditto. * config/arm/linux.mh: Ditto. * config/i386/x86-64linux.mh: Ditto. * config/ia64/linux.mh: Ditto. * config/m68k/linux.mh: Ditto. * config/mips/linux.mh: Ditto. * config/powerpc/linux.mh: Ditto. * config/sparc/linux.mh: Ditto.
2002-01-09 01:37:02 +01:00
/* Take over the 'find_mapped_memory' vector from inftarg.c. */
extern void
inftarg_set_find_memory_regions (int (*func) (int (*) (CORE_ADDR,
unsigned long,
int, int, int,
void *),
void *))
{
child_ops.to_find_memory_regions = func;
}
/* Take over the 'make_corefile_notes' vector from inftarg.c. */
extern void
inftarg_set_make_corefile_notes (char * (*func) (bfd *, int *))
{
child_ops.to_make_corefile_notes = func;
}
void
2000-07-30 03:48:28 +02:00
_initialize_inftarg (void)
{
#ifdef HAVE_OPTIONAL_PROC_FS
char procname[32];
int fd;
/* If we have an optional /proc filesystem (e.g. under OSF/1),
don't add ptrace support if we can access the running GDB via /proc. */
#ifndef PROC_NAME_FMT
#define PROC_NAME_FMT "/proc/%05d"
#endif
sprintf (procname, PROC_NAME_FMT, getpid ());
fd = open (procname, O_RDONLY);
if (fd >= 0)
{
close (fd);
return;
}
#endif
init_child_ops ();
add_target (&child_ops);
}