a3f171870f
Mark up some of printf_filtered and printf_unfiltered. * ada-lang.c, annotate.c, arch-utils.c, breakpoint.c: Update. * corelow.c, cp-namespace.c, cp-support.c, dcache.c: Update. * demangle.c, dsrec.c, dwarf2read.c, dwarfread.c: Update. * event-loop.c, event-top.c, exec.c, f-valprint.c: Update. * gdbtypes.c, inf-loop.c, inf-ptrace.c, inf-ttrace.c: Update. * infcmd.c, inflow.c, infrun.c, inftarg.c, language.c: Update. * linespec.c, linux-nat.c, linux-thread-db.c, maint.c: Update. * mdebugread.c, memattr.c, monitor.c, objc-lang.c: Update. * ocd.c, osabi.c, printcmd.c, procfs.c, regcache.c: Update. * remote.c, solib-som.c, solib.c, somsolib.c, source.c: Update. * stack.c, symfile.c, symmisc.c, target.c, thread.c: Update. * top.c, utils.c, valprint.c, value.c, cli/cli-cmds.c: Update. * cli/cli-dump.c, cli/cli-logging.c, tui/tui-hooks.c: Update. * tui/tui-regs.c, tui/tui-win.c: Update.
683 lines
19 KiB
C
683 lines
19 KiB
C
/* Low-level child interface to ptrace.
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Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
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1998, 1999, 2000, 2001, 2002, 2004, 2005
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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,
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Boston, MA 02111-1307, USA. */
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#include "defs.h"
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#include "command.h"
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#include "inferior.h"
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#include "inflow.h"
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#include "gdbcore.h"
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#include "observer.h"
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#include "regcache.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include "gdb_ptrace.h"
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#include "gdb_wait.h"
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#include <signal.h>
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#include "inf-child.h"
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/* HACK: Save the ptrace ops returned by inf_ptrace_target. */
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static struct target_ops *ptrace_ops_hack;
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static void
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inf_ptrace_kill_inferior (void)
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{
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int status;
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int pid = PIDGET (inferior_ptid);
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if (pid == 0)
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return;
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/* This once used to call "kill" to kill the inferior just in case
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the inferior was still running. As others have noted in the past
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(kingdon) there shouldn't be any way to get here if the inferior
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is still running -- else there's a major problem elsewere in GDB
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and it needs to be fixed.
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The kill call causes problems under HP-UX 10, so it's been
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removed; if this causes problems we'll deal with them as they
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arise. */
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ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3) 0, 0);
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wait (&status);
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target_mourn_inferior ();
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}
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/* Resume execution of the inferior process. If STEP is nonzero,
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single-step it. If SIGNAL is nonzero, give it that signal. */
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static void
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inf_ptrace_resume (ptid_t ptid, int step, enum target_signal signal)
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{
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int request = PT_CONTINUE;
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int pid = PIDGET (ptid);
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if (pid == -1)
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/* Resume all threads. */
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/* I think this only gets used in the non-threaded case, where
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"resume all threads" and "resume inferior_ptid" are the
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same. */
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pid = PIDGET (inferior_ptid);
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if (step)
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{
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/* If this system does not support PT_STEP, a higher level
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function will have called single_step() to transmute the step
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request into a continue request (by setting breakpoints on
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all possible successor instructions), so we don't have to
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worry about that here. */
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request = PT_STEP;
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}
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/* An address of (PTRACE_TYPE_ARG3)1 tells ptrace to continue from
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where it was. If GDB wanted it to start some other way, we have
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already written a new PC value to the child. */
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errno = 0;
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ptrace (request, pid, (PTRACE_TYPE_ARG3) 1, target_signal_to_host (signal));
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if (errno != 0)
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perror_with_name (("ptrace"));
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}
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/* Wait for child to do something. Return pid of child, or -1 in case
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of error; store status through argument pointer OURSTATUS. */
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static ptid_t
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inf_ptrace_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
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{
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int save_errno;
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int status;
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char *execd_pathname = NULL;
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int exit_status;
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int related_pid;
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int syscall_id;
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enum target_waitkind kind;
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int pid;
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do
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{
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set_sigint_trap (); /* Causes SIGINT to be passed on to the
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attached process. */
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set_sigio_trap ();
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pid = wait (&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)
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{
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if (save_errno == EINTR)
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continue;
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fprintf_unfiltered (gdb_stderr,
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"Child process unexpectedly missing: %s.\n",
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safe_strerror (save_errno));
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/* Claim it exited with unknown signal. */
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ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
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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))
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{
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/* ??rehrauer: For now, ignore this. */
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continue;
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}
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if (!target_thread_alive (pid_to_ptid (pid)))
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{
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ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
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return pid_to_ptid (pid);
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}
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}
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while (pid != PIDGET (inferior_ptid)); /* Some other child died or
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stopped. */
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store_waitstatus (ourstatus, status);
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return pid_to_ptid (pid);
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}
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/* Check to see if the given thread is alive.
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FIXME: Is kill() ever the right way to do this? I doubt it, but
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for now we're going to try and be compatable with the old thread
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code. */
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static int
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inf_ptrace_thread_alive (ptid_t ptid)
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{
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pid_t pid = PIDGET (ptid);
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return (kill (pid, 0) != -1);
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}
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/* Attach to process PID, then initialize for debugging it. */
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static void
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inf_ptrace_attach (char *args, int from_tty)
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{
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char *exec_file;
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int pid;
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char *dummy;
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if (!args)
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error_no_arg (_("process-id to attach"));
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dummy = args;
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pid = strtol (args, &dummy, 0);
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/* Some targets don't set errno on errors, grrr! */
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if (pid == 0 && args == dummy)
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error (_("Illegal process-id: %s."), args);
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if (pid == getpid ()) /* Trying to masturbate? */
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error (_("I refuse to debug myself!"));
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if (from_tty)
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{
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exec_file = (char *) get_exec_file (0);
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if (exec_file)
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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"),
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target_pid_to_str (pid_to_ptid (pid)));
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gdb_flush (gdb_stdout);
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}
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#ifdef PT_ATTACH
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errno = 0;
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ptrace (PT_ATTACH, pid, (PTRACE_TYPE_ARG3) 0, 0);
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if (errno != 0)
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perror_with_name (("ptrace"));
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attach_flag = 1;
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#else
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error (_("This system does not support attaching to a process"));
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#endif
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inferior_ptid = pid_to_ptid (pid);
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push_target (ptrace_ops_hack);
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/* Do this first, before anything has had a chance to query the
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inferior's symbol table or similar. */
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observer_notify_inferior_created (¤t_target, from_tty);
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}
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static void
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inf_ptrace_post_attach (int pid)
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{
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/* This version of Unix doesn't require a meaningful "post attach"
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operation by a debugger. */
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}
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/* Take a program previously attached to and detaches it. The program
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resumes execution and will no longer stop on signals, etc. We'd
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better not have left any breakpoints in the program or it'll die
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when it hits one. For this to work, it may be necessary for the
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process to have been previously attached. It *might* work if the
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program was started via the normal ptrace (PTRACE_TRACEME). */
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static void
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inf_ptrace_detach (char *args, int from_tty)
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{
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int sig = 0;
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int pid = PIDGET (inferior_ptid);
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if (from_tty)
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{
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char *exec_file = get_exec_file (0);
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if (exec_file == 0)
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exec_file = "";
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printf_unfiltered (_("Detaching from program: %s, %s\n"), exec_file,
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target_pid_to_str (pid_to_ptid (pid)));
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gdb_flush (gdb_stdout);
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}
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if (args)
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sig = atoi (args);
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#ifdef PT_DETACH
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errno = 0;
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ptrace (PT_DETACH, pid, (PTRACE_TYPE_ARG3) 1, sig);
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if (errno != 0)
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perror_with_name (("ptrace"));
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attach_flag = 0;
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#else
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error (_("This system does not support detaching from a process"));
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#endif
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inferior_ptid = null_ptid;
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unpush_target (ptrace_ops_hack);
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}
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/* Print status information about what we're accessing. */
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static void
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inf_ptrace_files_info (struct target_ops *ignore)
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{
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printf_unfiltered (_("\tUsing the running image of %s %s.\n"),
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attach_flag ? "attached" : "child",
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target_pid_to_str (inferior_ptid));
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}
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static void
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inf_ptrace_open (char *arg, int from_tty)
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{
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error (_("Use the \"run\" command to start a Unix child process."));
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}
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/* Stub function which causes the inferior that runs it, to be ptrace-able
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by its parent process. */
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static void
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inf_ptrace_me (void)
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{
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/* "Trace me, Dr. Memory!" */
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ptrace (0, 0, (PTRACE_TYPE_ARG3) 0, 0);
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}
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/* Stub function which causes the GDB that runs it, to start ptrace-ing
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the child process. */
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static void
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inf_ptrace_him (int pid)
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{
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push_target (ptrace_ops_hack);
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/* On some targets, there must be some explicit synchronization
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between the parent and child processes after the debugger
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forks, and before the child execs the debuggee program. This
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call basically gives permission for the child to exec. */
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target_acknowledge_created_inferior (pid);
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/* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will
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be 1 or 2 depending on whether we're starting without or with a
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shell. */
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startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
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/* On some targets, there must be some explicit actions taken after
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the inferior has been started up. */
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target_post_startup_inferior (pid_to_ptid (pid));
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}
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/* Start an inferior Unix child process and sets inferior_ptid to its
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pid. EXEC_FILE is the file to run. ALLARGS is a string containing
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the arguments to the program. ENV is the environment vector to
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pass. Errors reported with error(). */
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static void
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inf_ptrace_create_inferior (char *exec_file, char *allargs, char **env,
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int from_tty)
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{
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fork_inferior (exec_file, allargs, env, inf_ptrace_me, inf_ptrace_him,
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NULL, NULL);
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/* We are at the first instruction we care about. */
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observer_notify_inferior_created (¤t_target, from_tty);
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/* Pedal to the metal... */
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proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
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}
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static int
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inf_ptrace_reported_exec_events_per_exec_call (void)
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{
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/* Typically, we get a single SIGTRAP per exec. */
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return 1;
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}
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static int
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inf_ptrace_has_exited (int pid, int wait_status, int *exit_status)
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{
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if (WIFEXITED (wait_status))
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{
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*exit_status = WEXITSTATUS (wait_status);
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return 1;
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}
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if (WIFSIGNALED (wait_status))
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{
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*exit_status = 0; /* ?? Don't know what else to say here. */
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return 1;
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}
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/* ??? Do we really need to consult the event state, too?
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Assume the wait_state alone suffices. */
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return 0;
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}
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static void
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inf_ptrace_mourn_inferior (void)
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{
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unpush_target (ptrace_ops_hack);
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generic_mourn_inferior ();
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}
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static int
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inf_ptrace_can_run (void)
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{
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return 1;
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}
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/* Send a SIGINT to the process group. This acts just like the user
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typed a ^C on the controlling terminal.
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FIXME: This may not be correct for all systems. Some may want to
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use killpg() instead of kill (-pgrp). */
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static void
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inf_ptrace_stop (void)
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{
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kill (-inferior_process_group, SIGINT);
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}
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/* Perform a partial transfer to/from the specified object. For
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memory transfers, fall back to the old memory xfer functions. */
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static LONGEST
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inf_ptrace_xfer_partial (struct target_ops *ops, enum target_object object,
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const char *annex, void *readbuf,
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const void *writebuf, ULONGEST offset, LONGEST len)
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{
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switch (object)
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{
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case TARGET_OBJECT_MEMORY:
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#ifdef PT_IO
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/* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO
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request that promises to be much more efficient in reading
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and writing data in the traced process's address space. */
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{
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struct ptrace_io_desc piod;
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/* NOTE: We assume that there are no distinct address spaces
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for instruction and data. */
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piod.piod_op = writebuf ? PIOD_WRITE_D : PIOD_READ_D;
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piod.piod_addr = writebuf ? (void *) writebuf : readbuf;
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piod.piod_offs = (void *) (long) offset;
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piod.piod_len = len;
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errno = 0;
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if (ptrace (PT_IO, PIDGET (inferior_ptid), (caddr_t) &piod, 0) == 0)
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/* Return the actual number of bytes read or written. */
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return piod.piod_len;
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/* If the PT_IO request is somehow not supported, fallback on
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using PT_WRITE_D/PT_READ_D. Otherwise we will return zero
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to indicate failure. */
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if (errno != EINVAL)
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return 0;
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}
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#endif
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{
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union
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{
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PTRACE_TYPE_RET word;
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unsigned char byte[sizeof (PTRACE_TYPE_RET)];
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} buffer;
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ULONGEST rounded_offset;
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LONGEST partial_len;
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/* Round the start offset down to the next long word
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boundary. */
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rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET);
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/* Since ptrace will transfer a single word starting at that
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rounded_offset the partial_len needs to be adjusted down to
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that (remember this function only does a single transfer).
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Should the required length be even less, adjust it down
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again. */
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partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset;
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if (partial_len > len)
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partial_len = len;
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if (writebuf)
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{
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/* If OFFSET:PARTIAL_LEN is smaller than
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ROUNDED_OFFSET:WORDSIZE then a read/modify write will
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be needed. Read in the entire word. */
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if (rounded_offset < offset
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|| (offset + partial_len
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< rounded_offset + sizeof (PTRACE_TYPE_RET)))
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/* Need part of initial word -- fetch it. */
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buffer.word = ptrace (PT_READ_I, PIDGET (inferior_ptid),
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(PTRACE_TYPE_ARG3) (long) rounded_offset,
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0);
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/* Copy data to be written over corresponding part of
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buffer. */
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memcpy (buffer.byte + (offset - rounded_offset),
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writebuf, partial_len);
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errno = 0;
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ptrace (PT_WRITE_D, PIDGET (inferior_ptid),
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(PTRACE_TYPE_ARG3) (long) rounded_offset,
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buffer.word);
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if (errno)
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{
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/* Using the appropriate one (I or D) is necessary for
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Gould NP1, at least. */
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errno = 0;
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ptrace (PT_WRITE_I, PIDGET (inferior_ptid),
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(PTRACE_TYPE_ARG3) (long) rounded_offset,
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buffer.word);
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if (errno)
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return 0;
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}
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}
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if (readbuf)
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{
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errno = 0;
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buffer.word = ptrace (PT_READ_I, PIDGET (inferior_ptid),
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(PTRACE_TYPE_ARG3) (long) rounded_offset, 0);
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if (errno)
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return 0;
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/* Copy appropriate bytes out of the buffer. */
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memcpy (readbuf, buffer.byte + (offset - rounded_offset),
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partial_len);
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}
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return partial_len;
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}
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case TARGET_OBJECT_UNWIND_TABLE:
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return -1;
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case TARGET_OBJECT_AUXV:
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return -1;
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|
||
case TARGET_OBJECT_WCOOKIE:
|
||
return -1;
|
||
|
||
default:
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
static char *
|
||
inf_ptrace_pid_to_str (ptid_t ptid)
|
||
{
|
||
return normal_pid_to_str (ptid);
|
||
}
|
||
|
||
/* Create a prototype ptrace target. The client can override it with
|
||
local methods. */
|
||
|
||
struct target_ops *
|
||
inf_ptrace_target (void)
|
||
{
|
||
struct target_ops *t = inf_child_target ();
|
||
|
||
t->to_open = inf_ptrace_open;
|
||
t->to_attach = inf_ptrace_attach;
|
||
t->to_post_attach = inf_ptrace_post_attach;
|
||
t->to_detach = inf_ptrace_detach;
|
||
t->to_resume = inf_ptrace_resume;
|
||
t->to_wait = inf_ptrace_wait;
|
||
t->to_xfer_partial = inf_ptrace_xfer_partial;
|
||
t->to_files_info = inf_ptrace_files_info;
|
||
t->to_kill = inf_ptrace_kill_inferior;
|
||
t->to_create_inferior = inf_ptrace_create_inferior;
|
||
t->to_reported_exec_events_per_exec_call =
|
||
inf_ptrace_reported_exec_events_per_exec_call;
|
||
t->to_has_exited = inf_ptrace_has_exited;
|
||
t->to_mourn_inferior = inf_ptrace_mourn_inferior;
|
||
t->to_can_run = inf_ptrace_can_run;
|
||
t->to_thread_alive = inf_ptrace_thread_alive;
|
||
t->to_pid_to_str = inf_ptrace_pid_to_str;
|
||
t->to_stop = inf_ptrace_stop;
|
||
t->to_stratum = process_stratum;
|
||
t->to_has_all_memory = 1;
|
||
t->to_has_memory = 1;
|
||
t->to_has_stack = 1;
|
||
t->to_has_registers = 1;
|
||
t->to_has_execution = 1;
|
||
t->to_magic = OPS_MAGIC;
|
||
ptrace_ops_hack = t;
|
||
|
||
return t;
|
||
}
|
||
|
||
|
||
/* Pointer to a function that returns the oggset within the user area
|
||
where a particular register is stored. */
|
||
static CORE_ADDR (*inf_ptrace_register_u_offset)(int);
|
||
|
||
/* Fetch register REGNUM from the inferior. */
|
||
|
||
static void
|
||
inf_ptrace_fetch_register (int regnum)
|
||
{
|
||
CORE_ADDR addr;
|
||
size_t size;
|
||
PTRACE_TYPE_RET *buf;
|
||
int pid, i;
|
||
|
||
/* Cater for systems like GNU/Linux, that implement threads as
|
||
seperate processes. */
|
||
pid = ptid_get_lwp (inferior_ptid);
|
||
if (pid == 0)
|
||
pid = ptid_get_pid (inferior_ptid);
|
||
|
||
/* This isn't really an address, but ptrace thinks of it as one. */
|
||
addr = inf_ptrace_register_u_offset (regnum);
|
||
size = register_size (current_gdbarch, regnum);
|
||
|
||
gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
|
||
buf = alloca (size);
|
||
|
||
/* Read the register contents from the inferior a chuck at the time. */
|
||
for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
|
||
{
|
||
errno = 0;
|
||
buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3) addr, 0);
|
||
if (errno != 0)
|
||
error (_("Couldn't read register %s (#%d): %s."), REGISTER_NAME (regnum),
|
||
regnum, safe_strerror (errno));
|
||
|
||
addr += sizeof (PTRACE_TYPE_RET);
|
||
}
|
||
regcache_raw_supply (current_regcache, regnum, buf);
|
||
}
|
||
|
||
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
|
||
for all registers. */
|
||
|
||
static void
|
||
inf_ptrace_fetch_registers (int regnum)
|
||
{
|
||
if (regnum == -1)
|
||
for (regnum = 0; regnum < NUM_REGS; regnum++)
|
||
inf_ptrace_fetch_register (regnum);
|
||
else
|
||
inf_ptrace_fetch_register (regnum);
|
||
}
|
||
|
||
/* Store register REGNUM into the inferior. */
|
||
|
||
static void
|
||
inf_ptrace_store_register (int regnum)
|
||
{
|
||
CORE_ADDR addr;
|
||
size_t size;
|
||
PTRACE_TYPE_RET *buf;
|
||
int pid, i;
|
||
|
||
/* Cater for systems like GNU/Linux, that implement threads as
|
||
seperate processes. */
|
||
pid = ptid_get_lwp (inferior_ptid);
|
||
if (pid == 0)
|
||
pid = ptid_get_pid (inferior_ptid);
|
||
|
||
/* This isn't really an address, but ptrace thinks of it as one. */
|
||
addr = inf_ptrace_register_u_offset (regnum);
|
||
size = register_size (current_gdbarch, regnum);
|
||
|
||
gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
|
||
buf = alloca (size);
|
||
|
||
/* Write the register contents into the inferior a chunk at the time. */
|
||
regcache_raw_collect (current_regcache, regnum, buf);
|
||
for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
|
||
{
|
||
errno = 0;
|
||
ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3) addr, buf[i]);
|
||
if (errno != 0)
|
||
error (_("Couldn't write register %s (#%d): %s."), REGISTER_NAME (regnum),
|
||
regnum, safe_strerror (errno));
|
||
|
||
addr += sizeof (PTRACE_TYPE_RET);
|
||
}
|
||
}
|
||
|
||
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
|
||
this for all registers. */
|
||
|
||
void
|
||
inf_ptrace_store_registers (int regnum)
|
||
{
|
||
if (regnum == -1)
|
||
for (regnum = 0; regnum < NUM_REGS; regnum++)
|
||
inf_ptrace_store_register (regnum);
|
||
else
|
||
inf_ptrace_store_register (regnum);
|
||
}
|
||
|
||
/* Create a "traditional" ptrace target. REGISTER_U_OFFSET should be
|
||
a function returning the offset within the user area where a
|
||
particular register is stored. */
|
||
|
||
struct target_ops *
|
||
inf_ptrace_trad_target (CORE_ADDR (*register_u_offset)(int))
|
||
{
|
||
struct target_ops *t = inf_ptrace_target();
|
||
|
||
gdb_assert (register_u_offset);
|
||
inf_ptrace_register_u_offset = register_u_offset;
|
||
t->to_fetch_registers = inf_ptrace_fetch_registers;
|
||
t->to_store_registers = inf_ptrace_store_registers;
|
||
|
||
return t;
|
||
}
|