/* Low level interface to ptrace, for the remote server for GDB.
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/* Low level interface to ptrace, for the remote server for GDB.
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Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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2006, 2007, 2008 Free Software Foundation, Inc.
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2006, 2007, 2008 Free Software Foundation, Inc.
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This file is part of GDB.
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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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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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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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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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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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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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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "server.h"
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#include "server.h"
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#include "linux-low.h"
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#include "linux-low.h"
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#include <sys/wait.h>
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#include <sys/wait.h>
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#include <stdio.h>
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#include <stdio.h>
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#include <sys/param.h>
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <sys/dir.h>
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#include <sys/ptrace.h>
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#include <sys/ptrace.h>
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#include <sys/user.h>
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#include <sys/user.h>
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#include <signal.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <fcntl.h>
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#include <string.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <unistd.h>
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#include <errno.h>
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#include <errno.h>
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#include <sys/syscall.h>
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#include <sys/syscall.h>
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#include <sched.h>
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#include <sched.h>
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#ifndef PTRACE_GETSIGINFO
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#ifndef PTRACE_GETSIGINFO
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# define PTRACE_GETSIGINFO 0x4202
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# define PTRACE_GETSIGINFO 0x4202
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# define PTRACE_SETSIGINFO 0x4203
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# define PTRACE_SETSIGINFO 0x4203
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#endif
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#endif
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#ifndef O_LARGEFILE
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#ifndef O_LARGEFILE
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#define O_LARGEFILE 0
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#define O_LARGEFILE 0
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#endif
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#endif
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/* If the system headers did not provide the constants, hard-code the normal
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/* If the system headers did not provide the constants, hard-code the normal
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values. */
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values. */
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#ifndef PTRACE_EVENT_FORK
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#ifndef PTRACE_EVENT_FORK
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|
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#define PTRACE_SETOPTIONS 0x4200
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#define PTRACE_SETOPTIONS 0x4200
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#define PTRACE_GETEVENTMSG 0x4201
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#define PTRACE_GETEVENTMSG 0x4201
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|
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/* options set using PTRACE_SETOPTIONS */
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/* options set using PTRACE_SETOPTIONS */
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#define PTRACE_O_TRACESYSGOOD 0x00000001
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#define PTRACE_O_TRACESYSGOOD 0x00000001
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#define PTRACE_O_TRACEFORK 0x00000002
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#define PTRACE_O_TRACEFORK 0x00000002
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#define PTRACE_O_TRACEVFORK 0x00000004
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#define PTRACE_O_TRACEVFORK 0x00000004
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#define PTRACE_O_TRACECLONE 0x00000008
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#define PTRACE_O_TRACECLONE 0x00000008
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#define PTRACE_O_TRACEEXEC 0x00000010
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#define PTRACE_O_TRACEEXEC 0x00000010
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#define PTRACE_O_TRACEVFORKDONE 0x00000020
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#define PTRACE_O_TRACEVFORKDONE 0x00000020
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#define PTRACE_O_TRACEEXIT 0x00000040
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#define PTRACE_O_TRACEEXIT 0x00000040
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|
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/* Wait extended result codes for the above trace options. */
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/* Wait extended result codes for the above trace options. */
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#define PTRACE_EVENT_FORK 1
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#define PTRACE_EVENT_FORK 1
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#define PTRACE_EVENT_VFORK 2
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#define PTRACE_EVENT_VFORK 2
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#define PTRACE_EVENT_CLONE 3
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#define PTRACE_EVENT_CLONE 3
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#define PTRACE_EVENT_EXEC 4
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#define PTRACE_EVENT_EXEC 4
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#define PTRACE_EVENT_VFORK_DONE 5
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#define PTRACE_EVENT_VFORK_DONE 5
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#define PTRACE_EVENT_EXIT 6
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#define PTRACE_EVENT_EXIT 6
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#endif /* PTRACE_EVENT_FORK */
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#endif /* PTRACE_EVENT_FORK */
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/* We can't always assume that this flag is available, but all systems
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/* We can't always assume that this flag is available, but all systems
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with the ptrace event handlers also have __WALL, so it's safe to use
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with the ptrace event handlers also have __WALL, so it's safe to use
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in some contexts. */
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in some contexts. */
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#ifndef __WALL
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#ifndef __WALL
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#define __WALL 0x40000000 /* Wait for any child. */
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#define __WALL 0x40000000 /* Wait for any child. */
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#endif
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#endif
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#ifdef __UCLIBC__
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#ifdef __UCLIBC__
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#if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
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#if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))
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#define HAS_NOMMU
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#define HAS_NOMMU
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#endif
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#endif
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#endif
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#endif
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/* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol
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/* ``all_threads'' is keyed by the LWP ID, which we use as the GDB protocol
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representation of the thread ID.
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representation of the thread ID.
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``all_processes'' is keyed by the process ID - which on Linux is (presently)
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``all_processes'' is keyed by the process ID - which on Linux is (presently)
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the same as the LWP ID. */
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the same as the LWP ID. */
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struct inferior_list all_processes;
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struct inferior_list all_processes;
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/* A list of all unknown processes which receive stop signals. Some other
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/* A list of all unknown processes which receive stop signals. Some other
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process will presumably claim each of these as forked children
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process will presumably claim each of these as forked children
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momentarily. */
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momentarily. */
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struct inferior_list stopped_pids;
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struct inferior_list stopped_pids;
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/* FIXME this is a bit of a hack, and could be removed. */
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/* FIXME this is a bit of a hack, and could be removed. */
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int stopping_threads;
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int stopping_threads;
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/* FIXME make into a target method? */
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/* FIXME make into a target method? */
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int using_threads = 1;
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int using_threads = 1;
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static int thread_db_active;
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static int thread_db_active;
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static int must_set_ptrace_flags;
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static int must_set_ptrace_flags;
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static void linux_resume_one_process (struct inferior_list_entry *entry,
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static void linux_resume_one_process (struct inferior_list_entry *entry,
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int step, int signal, siginfo_t *info);
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int step, int signal, siginfo_t *info);
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static void linux_resume (struct thread_resume *resume_info);
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static void linux_resume (struct thread_resume *resume_info);
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static void stop_all_processes (void);
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static void stop_all_processes (void);
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static int linux_wait_for_event (struct thread_info *child);
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static int linux_wait_for_event (struct thread_info *child);
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static int check_removed_breakpoint (struct process_info *event_child);
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static int check_removed_breakpoint (struct process_info *event_child);
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static void *add_process (unsigned long pid);
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static void *add_process (unsigned long pid);
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struct pending_signals
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struct pending_signals
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{
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{
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int signal;
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int signal;
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siginfo_t info;
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siginfo_t info;
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struct pending_signals *prev;
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struct pending_signals *prev;
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};
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};
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#define PTRACE_ARG3_TYPE long
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#define PTRACE_ARG3_TYPE long
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#define PTRACE_XFER_TYPE long
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#define PTRACE_XFER_TYPE long
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#ifdef HAVE_LINUX_REGSETS
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#ifdef HAVE_LINUX_REGSETS
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static int use_regsets_p = 1;
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static int use_regsets_p = 1;
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#endif
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#endif
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#define pid_of(proc) ((proc)->head.id)
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#define pid_of(proc) ((proc)->head.id)
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/* FIXME: Delete eventually. */
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/* FIXME: Delete eventually. */
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#define inferior_pid (pid_of (get_thread_process (current_inferior)))
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#define inferior_pid (pid_of (get_thread_process (current_inferior)))
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static void
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static void
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handle_extended_wait (struct process_info *event_child, int wstat)
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handle_extended_wait (struct process_info *event_child, int wstat)
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{
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{
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int event = wstat >> 16;
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int event = wstat >> 16;
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struct process_info *new_process;
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struct process_info *new_process;
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if (event == PTRACE_EVENT_CLONE)
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if (event == PTRACE_EVENT_CLONE)
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{
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{
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unsigned long new_pid;
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unsigned long new_pid;
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int ret, status;
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int ret, status;
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ptrace (PTRACE_GETEVENTMSG, inferior_pid, 0, &new_pid);
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ptrace (PTRACE_GETEVENTMSG, inferior_pid, 0, &new_pid);
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/* If we haven't already seen the new PID stop, wait for it now. */
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/* If we haven't already seen the new PID stop, wait for it now. */
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if (! pull_pid_from_list (&stopped_pids, new_pid))
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if (! pull_pid_from_list (&stopped_pids, new_pid))
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{
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{
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/* The new child has a pending SIGSTOP. We can't affect it until it
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/* The new child has a pending SIGSTOP. We can't affect it until it
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hits the SIGSTOP, but we're already attached. */
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hits the SIGSTOP, but we're already attached. */
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do {
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do {
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ret = waitpid (new_pid, &status, __WALL);
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ret = waitpid (new_pid, &status, __WALL);
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} while (ret == -1 && errno == EINTR);
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} while (ret == -1 && errno == EINTR);
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if (ret == -1)
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if (ret == -1)
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perror_with_name ("waiting for new child");
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perror_with_name ("waiting for new child");
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else if (ret != new_pid)
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else if (ret != new_pid)
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warning ("wait returned unexpected PID %d", ret);
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warning ("wait returned unexpected PID %d", ret);
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else if (!WIFSTOPPED (status))
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else if (!WIFSTOPPED (status))
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warning ("wait returned unexpected status 0x%x", status);
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warning ("wait returned unexpected status 0x%x", status);
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}
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}
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ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE);
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ptrace (PTRACE_SETOPTIONS, new_pid, 0, PTRACE_O_TRACECLONE);
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new_process = (struct process_info *) add_process (new_pid);
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new_process = (struct process_info *) add_process (new_pid);
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add_thread (new_pid, new_process, new_pid);
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add_thread (new_pid, new_process, new_pid);
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new_thread_notify (thread_id_to_gdb_id (new_process->lwpid));
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new_thread_notify (thread_id_to_gdb_id (new_process->lwpid));
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/* Normally we will get the pending SIGSTOP. But in some cases
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/* Normally we will get the pending SIGSTOP. But in some cases
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we might get another signal delivered to the group first.
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we might get another signal delivered to the group first.
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If we do, be sure not to lose it. */
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If we do, be sure not to lose it. */
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if (WSTOPSIG (status) == SIGSTOP)
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if (WSTOPSIG (status) == SIGSTOP)
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{
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{
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if (stopping_threads)
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if (stopping_threads)
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new_process->stopped = 1;
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new_process->stopped = 1;
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else
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else
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ptrace (PTRACE_CONT, new_pid, 0, 0);
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ptrace (PTRACE_CONT, new_pid, 0, 0);
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}
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}
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else
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else
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{
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{
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new_process->stop_expected = 1;
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new_process->stop_expected = 1;
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if (stopping_threads)
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if (stopping_threads)
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{
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{
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new_process->stopped = 1;
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new_process->stopped = 1;
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new_process->status_pending_p = 1;
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new_process->status_pending_p = 1;
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new_process->status_pending = status;
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new_process->status_pending = status;
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}
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}
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else
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else
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/* Pass the signal on. This is what GDB does - except
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/* Pass the signal on. This is what GDB does - except
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shouldn't we really report it instead? */
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shouldn't we really report it instead? */
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ptrace (PTRACE_CONT, new_pid, 0, WSTOPSIG (status));
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ptrace (PTRACE_CONT, new_pid, 0, WSTOPSIG (status));
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}
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}
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/* Always resume the current thread. If we are stopping
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/* Always resume the current thread. If we are stopping
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threads, it will have a pending SIGSTOP; we may as well
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threads, it will have a pending SIGSTOP; we may as well
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collect it now. */
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collect it now. */
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linux_resume_one_process (&event_child->head,
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linux_resume_one_process (&event_child->head,
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event_child->stepping, 0, NULL);
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event_child->stepping, 0, NULL);
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}
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}
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}
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}
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/* This function should only be called if the process got a SIGTRAP.
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/* This function should only be called if the process got a SIGTRAP.
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The SIGTRAP could mean several things.
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The SIGTRAP could mean several things.
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On i386, where decr_pc_after_break is non-zero:
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On i386, where decr_pc_after_break is non-zero:
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If we were single-stepping this process using PTRACE_SINGLESTEP,
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If we were single-stepping this process using PTRACE_SINGLESTEP,
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we will get only the one SIGTRAP (even if the instruction we
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we will get only the one SIGTRAP (even if the instruction we
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stepped over was a breakpoint). The value of $eip will be the
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stepped over was a breakpoint). The value of $eip will be the
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next instruction.
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next instruction.
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If we continue the process using PTRACE_CONT, we will get a
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If we continue the process using PTRACE_CONT, we will get a
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SIGTRAP when we hit a breakpoint. The value of $eip will be
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SIGTRAP when we hit a breakpoint. The value of $eip will be
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the instruction after the breakpoint (i.e. needs to be
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the instruction after the breakpoint (i.e. needs to be
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decremented). If we report the SIGTRAP to GDB, we must also
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decremented). If we report the SIGTRAP to GDB, we must also
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report the undecremented PC. If we cancel the SIGTRAP, we
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report the undecremented PC. If we cancel the SIGTRAP, we
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must resume at the decremented PC.
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must resume at the decremented PC.
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|
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(Presumably, not yet tested) On a non-decr_pc_after_break machine
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(Presumably, not yet tested) On a non-decr_pc_after_break machine
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with hardware or kernel single-step:
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with hardware or kernel single-step:
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If we single-step over a breakpoint instruction, our PC will
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If we single-step over a breakpoint instruction, our PC will
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point at the following instruction. If we continue and hit a
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point at the following instruction. If we continue and hit a
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breakpoint instruction, our PC will point at the breakpoint
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breakpoint instruction, our PC will point at the breakpoint
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instruction. */
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instruction. */
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static CORE_ADDR
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static CORE_ADDR
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get_stop_pc (void)
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get_stop_pc (void)
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{
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{
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CORE_ADDR stop_pc = (*the_low_target.get_pc) ();
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CORE_ADDR stop_pc = (*the_low_target.get_pc) ();
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|
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if (get_thread_process (current_inferior)->stepping)
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if (get_thread_process (current_inferior)->stepping)
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return stop_pc;
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return stop_pc;
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else
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else
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return stop_pc - the_low_target.decr_pc_after_break;
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return stop_pc - the_low_target.decr_pc_after_break;
|
}
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}
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static void *
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static void *
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add_process (unsigned long pid)
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add_process (unsigned long pid)
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{
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{
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struct process_info *process;
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struct process_info *process;
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|
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process = (struct process_info *) malloc (sizeof (*process));
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process = (struct process_info *) malloc (sizeof (*process));
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memset (process, 0, sizeof (*process));
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memset (process, 0, sizeof (*process));
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|
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process->head.id = pid;
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process->head.id = pid;
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process->lwpid = pid;
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process->lwpid = pid;
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add_inferior_to_list (&all_processes, &process->head);
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add_inferior_to_list (&all_processes, &process->head);
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|
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return process;
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return process;
|
}
|
}
|
|
|
/* Start an inferior process and returns its pid.
|
/* Start an inferior process and returns its pid.
|
ALLARGS is a vector of program-name and args. */
|
ALLARGS is a vector of program-name and args. */
|
|
|
static int
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static int
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linux_create_inferior (char *program, char **allargs)
|
linux_create_inferior (char *program, char **allargs)
|
{
|
{
|
void *new_process;
|
void *new_process;
|
int pid;
|
int pid;
|
|
|
#if defined(__UCLIBC__) && defined(HAS_NOMMU)
|
#if defined(__UCLIBC__) && defined(HAS_NOMMU)
|
pid = vfork ();
|
pid = vfork ();
|
#else
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#else
|
pid = fork ();
|
pid = fork ();
|
#endif
|
#endif
|
if (pid < 0)
|
if (pid < 0)
|
perror_with_name ("fork");
|
perror_with_name ("fork");
|
|
|
if (pid == 0)
|
if (pid == 0)
|
{
|
{
|
ptrace (PTRACE_TRACEME, 0, 0, 0);
|
ptrace (PTRACE_TRACEME, 0, 0, 0);
|
|
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signal (__SIGRTMIN + 1, SIG_DFL);
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signal (__SIGRTMIN + 1, SIG_DFL);
|
|
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setpgid (0, 0);
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setpgid (0, 0);
|
|
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execv (program, allargs);
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execv (program, allargs);
|
if (errno == ENOENT)
|
if (errno == ENOENT)
|
execvp (program, allargs);
|
execvp (program, allargs);
|
|
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fprintf (stderr, "Cannot exec %s: %s.\n", program,
|
fprintf (stderr, "Cannot exec %s: %s.\n", program,
|
strerror (errno));
|
strerror (errno));
|
fflush (stderr);
|
fflush (stderr);
|
_exit (0177);
|
_exit (0177);
|
}
|
}
|
|
|
new_process = add_process (pid);
|
new_process = add_process (pid);
|
add_thread (pid, new_process, pid);
|
add_thread (pid, new_process, pid);
|
must_set_ptrace_flags = 1;
|
must_set_ptrace_flags = 1;
|
|
|
return pid;
|
return pid;
|
}
|
}
|
|
|
/* Attach to an inferior process. */
|
/* Attach to an inferior process. */
|
|
|
void
|
void
|
linux_attach_lwp (unsigned long pid)
|
linux_attach_lwp (unsigned long pid)
|
{
|
{
|
struct process_info *new_process;
|
struct process_info *new_process;
|
|
|
if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0)
|
if (ptrace (PTRACE_ATTACH, pid, 0, 0) != 0)
|
{
|
{
|
if (all_threads.head != NULL)
|
if (all_threads.head != NULL)
|
{
|
{
|
/* If we fail to attach to an LWP, just warn. */
|
/* If we fail to attach to an LWP, just warn. */
|
fprintf (stderr, "Cannot attach to process %ld: %s (%d)\n", pid,
|
fprintf (stderr, "Cannot attach to process %ld: %s (%d)\n", pid,
|
strerror (errno), errno);
|
strerror (errno), errno);
|
fflush (stderr);
|
fflush (stderr);
|
return;
|
return;
|
}
|
}
|
else
|
else
|
/* If we fail to attach to a process, report an error. */
|
/* If we fail to attach to a process, report an error. */
|
error ("Cannot attach to process %ld: %s (%d)\n", pid,
|
error ("Cannot attach to process %ld: %s (%d)\n", pid,
|
strerror (errno), errno);
|
strerror (errno), errno);
|
}
|
}
|
|
|
ptrace (PTRACE_SETOPTIONS, pid, 0, PTRACE_O_TRACECLONE);
|
ptrace (PTRACE_SETOPTIONS, pid, 0, PTRACE_O_TRACECLONE);
|
|
|
new_process = (struct process_info *) add_process (pid);
|
new_process = (struct process_info *) add_process (pid);
|
add_thread (pid, new_process, pid);
|
add_thread (pid, new_process, pid);
|
new_thread_notify (thread_id_to_gdb_id (new_process->lwpid));
|
new_thread_notify (thread_id_to_gdb_id (new_process->lwpid));
|
|
|
/* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
|
/* The next time we wait for this LWP we'll see a SIGSTOP as PTRACE_ATTACH
|
brings it to a halt. We should ignore that SIGSTOP and resume the process
|
brings it to a halt. We should ignore that SIGSTOP and resume the process
|
(unless this is the first process, in which case the flag will be cleared
|
(unless this is the first process, in which case the flag will be cleared
|
in linux_attach).
|
in linux_attach).
|
|
|
On the other hand, if we are currently trying to stop all threads, we
|
On the other hand, if we are currently trying to stop all threads, we
|
should treat the new thread as if we had sent it a SIGSTOP. This works
|
should treat the new thread as if we had sent it a SIGSTOP. This works
|
because we are guaranteed that add_process added us to the end of the
|
because we are guaranteed that add_process added us to the end of the
|
list, and so the new thread has not yet reached wait_for_sigstop (but
|
list, and so the new thread has not yet reached wait_for_sigstop (but
|
will). */
|
will). */
|
if (! stopping_threads)
|
if (! stopping_threads)
|
new_process->stop_expected = 1;
|
new_process->stop_expected = 1;
|
}
|
}
|
|
|
int
|
int
|
linux_attach (unsigned long pid)
|
linux_attach (unsigned long pid)
|
{
|
{
|
struct process_info *process;
|
struct process_info *process;
|
|
|
linux_attach_lwp (pid);
|
linux_attach_lwp (pid);
|
|
|
/* Don't ignore the initial SIGSTOP if we just attached to this process.
|
/* Don't ignore the initial SIGSTOP if we just attached to this process.
|
It will be collected by wait shortly. */
|
It will be collected by wait shortly. */
|
process = (struct process_info *) find_inferior_id (&all_processes, pid);
|
process = (struct process_info *) find_inferior_id (&all_processes, pid);
|
process->stop_expected = 0;
|
process->stop_expected = 0;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Kill the inferior process. Make us have no inferior. */
|
/* Kill the inferior process. Make us have no inferior. */
|
|
|
static void
|
static void
|
linux_kill_one_process (struct inferior_list_entry *entry)
|
linux_kill_one_process (struct inferior_list_entry *entry)
|
{
|
{
|
struct thread_info *thread = (struct thread_info *) entry;
|
struct thread_info *thread = (struct thread_info *) entry;
|
struct process_info *process = get_thread_process (thread);
|
struct process_info *process = get_thread_process (thread);
|
int wstat;
|
int wstat;
|
|
|
/* We avoid killing the first thread here, because of a Linux kernel (at
|
/* We avoid killing the first thread here, because of a Linux kernel (at
|
least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
|
least 2.6.0-test7 through 2.6.8-rc4) bug; if we kill the parent before
|
the children get a chance to be reaped, it will remain a zombie
|
the children get a chance to be reaped, it will remain a zombie
|
forever. */
|
forever. */
|
if (entry == all_threads.head)
|
if (entry == all_threads.head)
|
return;
|
return;
|
|
|
do
|
do
|
{
|
{
|
ptrace (PTRACE_KILL, pid_of (process), 0, 0);
|
ptrace (PTRACE_KILL, pid_of (process), 0, 0);
|
|
|
/* Make sure it died. The loop is most likely unnecessary. */
|
/* Make sure it died. The loop is most likely unnecessary. */
|
wstat = linux_wait_for_event (thread);
|
wstat = linux_wait_for_event (thread);
|
} while (WIFSTOPPED (wstat));
|
} while (WIFSTOPPED (wstat));
|
}
|
}
|
|
|
static void
|
static void
|
linux_kill (void)
|
linux_kill (void)
|
{
|
{
|
struct thread_info *thread = (struct thread_info *) all_threads.head;
|
struct thread_info *thread = (struct thread_info *) all_threads.head;
|
struct process_info *process;
|
struct process_info *process;
|
int wstat;
|
int wstat;
|
|
|
if (thread == NULL)
|
if (thread == NULL)
|
return;
|
return;
|
|
|
for_each_inferior (&all_threads, linux_kill_one_process);
|
for_each_inferior (&all_threads, linux_kill_one_process);
|
|
|
/* See the comment in linux_kill_one_process. We did not kill the first
|
/* See the comment in linux_kill_one_process. We did not kill the first
|
thread in the list, so do so now. */
|
thread in the list, so do so now. */
|
process = get_thread_process (thread);
|
process = get_thread_process (thread);
|
do
|
do
|
{
|
{
|
ptrace (PTRACE_KILL, pid_of (process), 0, 0);
|
ptrace (PTRACE_KILL, pid_of (process), 0, 0);
|
|
|
/* Make sure it died. The loop is most likely unnecessary. */
|
/* Make sure it died. The loop is most likely unnecessary. */
|
wstat = linux_wait_for_event (thread);
|
wstat = linux_wait_for_event (thread);
|
} while (WIFSTOPPED (wstat));
|
} while (WIFSTOPPED (wstat));
|
|
|
clear_inferiors ();
|
clear_inferiors ();
|
free (all_processes.head);
|
free (all_processes.head);
|
all_processes.head = all_processes.tail = NULL;
|
all_processes.head = all_processes.tail = NULL;
|
}
|
}
|
|
|
static void
|
static void
|
linux_detach_one_process (struct inferior_list_entry *entry)
|
linux_detach_one_process (struct inferior_list_entry *entry)
|
{
|
{
|
struct thread_info *thread = (struct thread_info *) entry;
|
struct thread_info *thread = (struct thread_info *) entry;
|
struct process_info *process = get_thread_process (thread);
|
struct process_info *process = get_thread_process (thread);
|
|
|
/* Make sure the process isn't stopped at a breakpoint that's
|
/* Make sure the process isn't stopped at a breakpoint that's
|
no longer there. */
|
no longer there. */
|
check_removed_breakpoint (process);
|
check_removed_breakpoint (process);
|
|
|
/* If this process is stopped but is expecting a SIGSTOP, then make
|
/* If this process is stopped but is expecting a SIGSTOP, then make
|
sure we take care of that now. This isn't absolutely guaranteed
|
sure we take care of that now. This isn't absolutely guaranteed
|
to collect the SIGSTOP, but is fairly likely to. */
|
to collect the SIGSTOP, but is fairly likely to. */
|
if (process->stop_expected)
|
if (process->stop_expected)
|
{
|
{
|
/* Clear stop_expected, so that the SIGSTOP will be reported. */
|
/* Clear stop_expected, so that the SIGSTOP will be reported. */
|
process->stop_expected = 0;
|
process->stop_expected = 0;
|
if (process->stopped)
|
if (process->stopped)
|
linux_resume_one_process (&process->head, 0, 0, NULL);
|
linux_resume_one_process (&process->head, 0, 0, NULL);
|
linux_wait_for_event (thread);
|
linux_wait_for_event (thread);
|
}
|
}
|
|
|
/* Flush any pending changes to the process's registers. */
|
/* Flush any pending changes to the process's registers. */
|
regcache_invalidate_one ((struct inferior_list_entry *)
|
regcache_invalidate_one ((struct inferior_list_entry *)
|
get_process_thread (process));
|
get_process_thread (process));
|
|
|
/* Finally, let it resume. */
|
/* Finally, let it resume. */
|
ptrace (PTRACE_DETACH, pid_of (process), 0, 0);
|
ptrace (PTRACE_DETACH, pid_of (process), 0, 0);
|
}
|
}
|
|
|
static int
|
static int
|
linux_detach (void)
|
linux_detach (void)
|
{
|
{
|
delete_all_breakpoints ();
|
delete_all_breakpoints ();
|
for_each_inferior (&all_threads, linux_detach_one_process);
|
for_each_inferior (&all_threads, linux_detach_one_process);
|
clear_inferiors ();
|
clear_inferiors ();
|
free (all_processes.head);
|
free (all_processes.head);
|
all_processes.head = all_processes.tail = NULL;
|
all_processes.head = all_processes.tail = NULL;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void
|
static void
|
linux_join (void)
|
linux_join (void)
|
{
|
{
|
extern unsigned long signal_pid;
|
extern unsigned long signal_pid;
|
int status, ret;
|
int status, ret;
|
|
|
do {
|
do {
|
ret = waitpid (signal_pid, &status, 0);
|
ret = waitpid (signal_pid, &status, 0);
|
if (WIFEXITED (status) || WIFSIGNALED (status))
|
if (WIFEXITED (status) || WIFSIGNALED (status))
|
break;
|
break;
|
} while (ret != -1 || errno != ECHILD);
|
} while (ret != -1 || errno != ECHILD);
|
}
|
}
|
|
|
/* Return nonzero if the given thread is still alive. */
|
/* Return nonzero if the given thread is still alive. */
|
static int
|
static int
|
linux_thread_alive (unsigned long lwpid)
|
linux_thread_alive (unsigned long lwpid)
|
{
|
{
|
if (find_inferior_id (&all_threads, lwpid) != NULL)
|
if (find_inferior_id (&all_threads, lwpid) != NULL)
|
return 1;
|
return 1;
|
else
|
else
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Return nonzero if this process stopped at a breakpoint which
|
/* Return nonzero if this process stopped at a breakpoint which
|
no longer appears to be inserted. Also adjust the PC
|
no longer appears to be inserted. Also adjust the PC
|
appropriately to resume where the breakpoint used to be. */
|
appropriately to resume where the breakpoint used to be. */
|
static int
|
static int
|
check_removed_breakpoint (struct process_info *event_child)
|
check_removed_breakpoint (struct process_info *event_child)
|
{
|
{
|
CORE_ADDR stop_pc;
|
CORE_ADDR stop_pc;
|
struct thread_info *saved_inferior;
|
struct thread_info *saved_inferior;
|
|
|
if (event_child->pending_is_breakpoint == 0)
|
if (event_child->pending_is_breakpoint == 0)
|
return 0;
|
return 0;
|
|
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "Checking for breakpoint in process %ld.\n",
|
fprintf (stderr, "Checking for breakpoint in process %ld.\n",
|
event_child->lwpid);
|
event_child->lwpid);
|
|
|
saved_inferior = current_inferior;
|
saved_inferior = current_inferior;
|
current_inferior = get_process_thread (event_child);
|
current_inferior = get_process_thread (event_child);
|
|
|
stop_pc = get_stop_pc ();
|
stop_pc = get_stop_pc ();
|
|
|
/* If the PC has changed since we stopped, then we shouldn't do
|
/* If the PC has changed since we stopped, then we shouldn't do
|
anything. This happens if, for instance, GDB handled the
|
anything. This happens if, for instance, GDB handled the
|
decr_pc_after_break subtraction itself. */
|
decr_pc_after_break subtraction itself. */
|
if (stop_pc != event_child->pending_stop_pc)
|
if (stop_pc != event_child->pending_stop_pc)
|
{
|
{
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n",
|
fprintf (stderr, "Ignoring, PC was changed. Old PC was 0x%08llx\n",
|
event_child->pending_stop_pc);
|
event_child->pending_stop_pc);
|
|
|
event_child->pending_is_breakpoint = 0;
|
event_child->pending_is_breakpoint = 0;
|
current_inferior = saved_inferior;
|
current_inferior = saved_inferior;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* If the breakpoint is still there, we will report hitting it. */
|
/* If the breakpoint is still there, we will report hitting it. */
|
if ((*the_low_target.breakpoint_at) (stop_pc))
|
if ((*the_low_target.breakpoint_at) (stop_pc))
|
{
|
{
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "Ignoring, breakpoint is still present.\n");
|
fprintf (stderr, "Ignoring, breakpoint is still present.\n");
|
current_inferior = saved_inferior;
|
current_inferior = saved_inferior;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "Removed breakpoint.\n");
|
fprintf (stderr, "Removed breakpoint.\n");
|
|
|
/* For decr_pc_after_break targets, here is where we perform the
|
/* For decr_pc_after_break targets, here is where we perform the
|
decrement. We go immediately from this function to resuming,
|
decrement. We go immediately from this function to resuming,
|
and can not safely call get_stop_pc () again. */
|
and can not safely call get_stop_pc () again. */
|
if (the_low_target.set_pc != NULL)
|
if (the_low_target.set_pc != NULL)
|
(*the_low_target.set_pc) (stop_pc);
|
(*the_low_target.set_pc) (stop_pc);
|
|
|
/* We consumed the pending SIGTRAP. */
|
/* We consumed the pending SIGTRAP. */
|
event_child->pending_is_breakpoint = 0;
|
event_child->pending_is_breakpoint = 0;
|
event_child->status_pending_p = 0;
|
event_child->status_pending_p = 0;
|
event_child->status_pending = 0;
|
event_child->status_pending = 0;
|
|
|
current_inferior = saved_inferior;
|
current_inferior = saved_inferior;
|
return 1;
|
return 1;
|
}
|
}
|
|
|
/* Return 1 if this process has an interesting status pending. This function
|
/* Return 1 if this process has an interesting status pending. This function
|
may silently resume an inferior process. */
|
may silently resume an inferior process. */
|
static int
|
static int
|
status_pending_p (struct inferior_list_entry *entry, void *dummy)
|
status_pending_p (struct inferior_list_entry *entry, void *dummy)
|
{
|
{
|
struct process_info *process = (struct process_info *) entry;
|
struct process_info *process = (struct process_info *) entry;
|
|
|
if (process->status_pending_p)
|
if (process->status_pending_p)
|
if (check_removed_breakpoint (process))
|
if (check_removed_breakpoint (process))
|
{
|
{
|
/* This thread was stopped at a breakpoint, and the breakpoint
|
/* This thread was stopped at a breakpoint, and the breakpoint
|
is now gone. We were told to continue (or step...) all threads,
|
is now gone. We were told to continue (or step...) all threads,
|
so GDB isn't trying to single-step past this breakpoint.
|
so GDB isn't trying to single-step past this breakpoint.
|
So instead of reporting the old SIGTRAP, pretend we got to
|
So instead of reporting the old SIGTRAP, pretend we got to
|
the breakpoint just after it was removed instead of just
|
the breakpoint just after it was removed instead of just
|
before; resume the process. */
|
before; resume the process. */
|
linux_resume_one_process (&process->head, 0, 0, NULL);
|
linux_resume_one_process (&process->head, 0, 0, NULL);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
return process->status_pending_p;
|
return process->status_pending_p;
|
}
|
}
|
|
|
static void
|
static void
|
linux_wait_for_process (struct process_info **childp, int *wstatp)
|
linux_wait_for_process (struct process_info **childp, int *wstatp)
|
{
|
{
|
int ret;
|
int ret;
|
int to_wait_for = -1;
|
int to_wait_for = -1;
|
|
|
if (*childp != NULL)
|
if (*childp != NULL)
|
to_wait_for = (*childp)->lwpid;
|
to_wait_for = (*childp)->lwpid;
|
|
|
retry:
|
retry:
|
while (1)
|
while (1)
|
{
|
{
|
ret = waitpid (to_wait_for, wstatp, WNOHANG);
|
ret = waitpid (to_wait_for, wstatp, WNOHANG);
|
|
|
if (ret == -1)
|
if (ret == -1)
|
{
|
{
|
if (errno != ECHILD)
|
if (errno != ECHILD)
|
perror_with_name ("waitpid");
|
perror_with_name ("waitpid");
|
}
|
}
|
else if (ret > 0)
|
else if (ret > 0)
|
break;
|
break;
|
|
|
ret = waitpid (to_wait_for, wstatp, WNOHANG | __WCLONE);
|
ret = waitpid (to_wait_for, wstatp, WNOHANG | __WCLONE);
|
|
|
if (ret == -1)
|
if (ret == -1)
|
{
|
{
|
if (errno != ECHILD)
|
if (errno != ECHILD)
|
perror_with_name ("waitpid (WCLONE)");
|
perror_with_name ("waitpid (WCLONE)");
|
}
|
}
|
else if (ret > 0)
|
else if (ret > 0)
|
break;
|
break;
|
|
|
usleep (1000);
|
usleep (1000);
|
}
|
}
|
|
|
if (debug_threads
|
if (debug_threads
|
&& (!WIFSTOPPED (*wstatp)
|
&& (!WIFSTOPPED (*wstatp)
|
|| (WSTOPSIG (*wstatp) != 32
|
|| (WSTOPSIG (*wstatp) != 32
|
&& WSTOPSIG (*wstatp) != 33)))
|
&& WSTOPSIG (*wstatp) != 33)))
|
fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp);
|
fprintf (stderr, "Got an event from %d (%x)\n", ret, *wstatp);
|
|
|
if (to_wait_for == -1)
|
if (to_wait_for == -1)
|
*childp = (struct process_info *) find_inferior_id (&all_processes, ret);
|
*childp = (struct process_info *) find_inferior_id (&all_processes, ret);
|
|
|
/* If we didn't find a process, one of two things presumably happened:
|
/* If we didn't find a process, one of two things presumably happened:
|
- A process we started and then detached from has exited. Ignore it.
|
- A process we started and then detached from has exited. Ignore it.
|
- A process we are controlling has forked and the new child's stop
|
- A process we are controlling has forked and the new child's stop
|
was reported to us by the kernel. Save its PID. */
|
was reported to us by the kernel. Save its PID. */
|
if (*childp == NULL && WIFSTOPPED (*wstatp))
|
if (*childp == NULL && WIFSTOPPED (*wstatp))
|
{
|
{
|
add_pid_to_list (&stopped_pids, ret);
|
add_pid_to_list (&stopped_pids, ret);
|
goto retry;
|
goto retry;
|
}
|
}
|
else if (*childp == NULL)
|
else if (*childp == NULL)
|
goto retry;
|
goto retry;
|
|
|
(*childp)->stopped = 1;
|
(*childp)->stopped = 1;
|
(*childp)->pending_is_breakpoint = 0;
|
(*childp)->pending_is_breakpoint = 0;
|
|
|
(*childp)->last_status = *wstatp;
|
(*childp)->last_status = *wstatp;
|
|
|
if (debug_threads
|
if (debug_threads
|
&& WIFSTOPPED (*wstatp))
|
&& WIFSTOPPED (*wstatp))
|
{
|
{
|
current_inferior = (struct thread_info *)
|
current_inferior = (struct thread_info *)
|
find_inferior_id (&all_threads, (*childp)->lwpid);
|
find_inferior_id (&all_threads, (*childp)->lwpid);
|
/* For testing only; i386_stop_pc prints out a diagnostic. */
|
/* For testing only; i386_stop_pc prints out a diagnostic. */
|
if (the_low_target.get_pc != NULL)
|
if (the_low_target.get_pc != NULL)
|
get_stop_pc ();
|
get_stop_pc ();
|
}
|
}
|
}
|
}
|
|
|
static int
|
static int
|
linux_wait_for_event (struct thread_info *child)
|
linux_wait_for_event (struct thread_info *child)
|
{
|
{
|
CORE_ADDR stop_pc;
|
CORE_ADDR stop_pc;
|
struct process_info *event_child;
|
struct process_info *event_child;
|
int wstat;
|
int wstat;
|
int bp_status;
|
int bp_status;
|
|
|
/* Check for a process with a pending status. */
|
/* Check for a process with a pending status. */
|
/* It is possible that the user changed the pending task's registers since
|
/* It is possible that the user changed the pending task's registers since
|
it stopped. We correctly handle the change of PC if we hit a breakpoint
|
it stopped. We correctly handle the change of PC if we hit a breakpoint
|
(in check_removed_breakpoint); signals should be reported anyway. */
|
(in check_removed_breakpoint); signals should be reported anyway. */
|
if (child == NULL)
|
if (child == NULL)
|
{
|
{
|
event_child = (struct process_info *)
|
event_child = (struct process_info *)
|
find_inferior (&all_processes, status_pending_p, NULL);
|
find_inferior (&all_processes, status_pending_p, NULL);
|
if (debug_threads && event_child)
|
if (debug_threads && event_child)
|
fprintf (stderr, "Got a pending child %ld\n", event_child->lwpid);
|
fprintf (stderr, "Got a pending child %ld\n", event_child->lwpid);
|
}
|
}
|
else
|
else
|
{
|
{
|
event_child = get_thread_process (child);
|
event_child = get_thread_process (child);
|
if (event_child->status_pending_p
|
if (event_child->status_pending_p
|
&& check_removed_breakpoint (event_child))
|
&& check_removed_breakpoint (event_child))
|
event_child = NULL;
|
event_child = NULL;
|
}
|
}
|
|
|
if (event_child != NULL)
|
if (event_child != NULL)
|
{
|
{
|
if (event_child->status_pending_p)
|
if (event_child->status_pending_p)
|
{
|
{
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "Got an event from pending child %ld (%04x)\n",
|
fprintf (stderr, "Got an event from pending child %ld (%04x)\n",
|
event_child->lwpid, event_child->status_pending);
|
event_child->lwpid, event_child->status_pending);
|
wstat = event_child->status_pending;
|
wstat = event_child->status_pending;
|
event_child->status_pending_p = 0;
|
event_child->status_pending_p = 0;
|
event_child->status_pending = 0;
|
event_child->status_pending = 0;
|
current_inferior = get_process_thread (event_child);
|
current_inferior = get_process_thread (event_child);
|
return wstat;
|
return wstat;
|
}
|
}
|
}
|
}
|
|
|
/* We only enter this loop if no process has a pending wait status. Thus
|
/* We only enter this loop if no process has a pending wait status. Thus
|
any action taken in response to a wait status inside this loop is
|
any action taken in response to a wait status inside this loop is
|
responding as soon as we detect the status, not after any pending
|
responding as soon as we detect the status, not after any pending
|
events. */
|
events. */
|
while (1)
|
while (1)
|
{
|
{
|
if (child == NULL)
|
if (child == NULL)
|
event_child = NULL;
|
event_child = NULL;
|
else
|
else
|
event_child = get_thread_process (child);
|
event_child = get_thread_process (child);
|
|
|
linux_wait_for_process (&event_child, &wstat);
|
linux_wait_for_process (&event_child, &wstat);
|
|
|
if (event_child == NULL)
|
if (event_child == NULL)
|
error ("event from unknown child");
|
error ("event from unknown child");
|
|
|
current_inferior = (struct thread_info *)
|
current_inferior = (struct thread_info *)
|
find_inferior_id (&all_threads, event_child->lwpid);
|
find_inferior_id (&all_threads, event_child->lwpid);
|
|
|
/* Check for thread exit. */
|
/* Check for thread exit. */
|
if (! WIFSTOPPED (wstat))
|
if (! WIFSTOPPED (wstat))
|
{
|
{
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "LWP %ld exiting\n", event_child->head.id);
|
fprintf (stderr, "LWP %ld exiting\n", event_child->head.id);
|
|
|
/* If the last thread is exiting, just return. */
|
/* If the last thread is exiting, just return. */
|
if (all_threads.head == all_threads.tail)
|
if (all_threads.head == all_threads.tail)
|
return wstat;
|
return wstat;
|
|
|
dead_thread_notify (thread_id_to_gdb_id (event_child->lwpid));
|
dead_thread_notify (thread_id_to_gdb_id (event_child->lwpid));
|
|
|
remove_inferior (&all_processes, &event_child->head);
|
remove_inferior (&all_processes, &event_child->head);
|
free (event_child);
|
free (event_child);
|
remove_thread (current_inferior);
|
remove_thread (current_inferior);
|
current_inferior = (struct thread_info *) all_threads.head;
|
current_inferior = (struct thread_info *) all_threads.head;
|
|
|
/* If we were waiting for this particular child to do something...
|
/* If we were waiting for this particular child to do something...
|
well, it did something. */
|
well, it did something. */
|
if (child != NULL)
|
if (child != NULL)
|
return wstat;
|
return wstat;
|
|
|
/* Wait for a more interesting event. */
|
/* Wait for a more interesting event. */
|
continue;
|
continue;
|
}
|
}
|
|
|
if (WIFSTOPPED (wstat)
|
if (WIFSTOPPED (wstat)
|
&& WSTOPSIG (wstat) == SIGSTOP
|
&& WSTOPSIG (wstat) == SIGSTOP
|
&& event_child->stop_expected)
|
&& event_child->stop_expected)
|
{
|
{
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "Expected stop.\n");
|
fprintf (stderr, "Expected stop.\n");
|
event_child->stop_expected = 0;
|
event_child->stop_expected = 0;
|
linux_resume_one_process (&event_child->head,
|
linux_resume_one_process (&event_child->head,
|
event_child->stepping, 0, NULL);
|
event_child->stepping, 0, NULL);
|
continue;
|
continue;
|
}
|
}
|
|
|
if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP
|
if (WIFSTOPPED (wstat) && WSTOPSIG (wstat) == SIGTRAP
|
&& wstat >> 16 != 0)
|
&& wstat >> 16 != 0)
|
{
|
{
|
handle_extended_wait (event_child, wstat);
|
handle_extended_wait (event_child, wstat);
|
continue;
|
continue;
|
}
|
}
|
|
|
/* If GDB is not interested in this signal, don't stop other
|
/* If GDB is not interested in this signal, don't stop other
|
threads, and don't report it to GDB. Just resume the
|
threads, and don't report it to GDB. Just resume the
|
inferior right away. We do this for threading-related
|
inferior right away. We do this for threading-related
|
signals as well as any that GDB specifically requested we
|
signals as well as any that GDB specifically requested we
|
ignore. But never ignore SIGSTOP if we sent it ourselves,
|
ignore. But never ignore SIGSTOP if we sent it ourselves,
|
and do not ignore signals when stepping - they may require
|
and do not ignore signals when stepping - they may require
|
special handling to skip the signal handler. */
|
special handling to skip the signal handler. */
|
/* FIXME drow/2002-06-09: Get signal numbers from the inferior's
|
/* FIXME drow/2002-06-09: Get signal numbers from the inferior's
|
thread library? */
|
thread library? */
|
if (WIFSTOPPED (wstat)
|
if (WIFSTOPPED (wstat)
|
&& !event_child->stepping
|
&& !event_child->stepping
|
&& (
|
&& (
|
#ifdef USE_THREAD_DB
|
#ifdef USE_THREAD_DB
|
(thread_db_active && (WSTOPSIG (wstat) == __SIGRTMIN
|
(thread_db_active && (WSTOPSIG (wstat) == __SIGRTMIN
|
|| WSTOPSIG (wstat) == __SIGRTMIN + 1))
|
|| WSTOPSIG (wstat) == __SIGRTMIN + 1))
|
||
|
||
|
#endif
|
#endif
|
(pass_signals[target_signal_from_host (WSTOPSIG (wstat))]
|
(pass_signals[target_signal_from_host (WSTOPSIG (wstat))]
|
&& (WSTOPSIG (wstat) != SIGSTOP || !stopping_threads))))
|
&& (WSTOPSIG (wstat) != SIGSTOP || !stopping_threads))))
|
{
|
{
|
siginfo_t info, *info_p;
|
siginfo_t info, *info_p;
|
|
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "Ignored signal %d for LWP %ld.\n",
|
fprintf (stderr, "Ignored signal %d for LWP %ld.\n",
|
WSTOPSIG (wstat), event_child->head.id);
|
WSTOPSIG (wstat), event_child->head.id);
|
|
|
if (ptrace (PTRACE_GETSIGINFO, event_child->lwpid, 0, &info) == 0)
|
if (ptrace (PTRACE_GETSIGINFO, event_child->lwpid, 0, &info) == 0)
|
info_p = &info;
|
info_p = &info;
|
else
|
else
|
info_p = NULL;
|
info_p = NULL;
|
linux_resume_one_process (&event_child->head,
|
linux_resume_one_process (&event_child->head,
|
event_child->stepping,
|
event_child->stepping,
|
WSTOPSIG (wstat), info_p);
|
WSTOPSIG (wstat), info_p);
|
continue;
|
continue;
|
}
|
}
|
|
|
/* If this event was not handled above, and is not a SIGTRAP, report
|
/* If this event was not handled above, and is not a SIGTRAP, report
|
it. */
|
it. */
|
if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGTRAP)
|
if (!WIFSTOPPED (wstat) || WSTOPSIG (wstat) != SIGTRAP)
|
return wstat;
|
return wstat;
|
|
|
/* If this target does not support breakpoints, we simply report the
|
/* If this target does not support breakpoints, we simply report the
|
SIGTRAP; it's of no concern to us. */
|
SIGTRAP; it's of no concern to us. */
|
if (the_low_target.get_pc == NULL)
|
if (the_low_target.get_pc == NULL)
|
return wstat;
|
return wstat;
|
|
|
stop_pc = get_stop_pc ();
|
stop_pc = get_stop_pc ();
|
|
|
/* bp_reinsert will only be set if we were single-stepping.
|
/* bp_reinsert will only be set if we were single-stepping.
|
Notice that we will resume the process after hitting
|
Notice that we will resume the process after hitting
|
a gdbserver breakpoint; single-stepping to/over one
|
a gdbserver breakpoint; single-stepping to/over one
|
is not supported (yet). */
|
is not supported (yet). */
|
if (event_child->bp_reinsert != 0)
|
if (event_child->bp_reinsert != 0)
|
{
|
{
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "Reinserted breakpoint.\n");
|
fprintf (stderr, "Reinserted breakpoint.\n");
|
reinsert_breakpoint (event_child->bp_reinsert);
|
reinsert_breakpoint (event_child->bp_reinsert);
|
event_child->bp_reinsert = 0;
|
event_child->bp_reinsert = 0;
|
|
|
/* Clear the single-stepping flag and SIGTRAP as we resume. */
|
/* Clear the single-stepping flag and SIGTRAP as we resume. */
|
linux_resume_one_process (&event_child->head, 0, 0, NULL);
|
linux_resume_one_process (&event_child->head, 0, 0, NULL);
|
continue;
|
continue;
|
}
|
}
|
|
|
bp_status = check_breakpoints (stop_pc);
|
bp_status = check_breakpoints (stop_pc);
|
|
|
if (bp_status != 0)
|
if (bp_status != 0)
|
{
|
{
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "Hit a gdbserver breakpoint.\n");
|
fprintf (stderr, "Hit a gdbserver breakpoint.\n");
|
|
|
/* We hit one of our own breakpoints. We mark it as a pending
|
/* We hit one of our own breakpoints. We mark it as a pending
|
breakpoint, so that check_removed_breakpoint () will do the PC
|
breakpoint, so that check_removed_breakpoint () will do the PC
|
adjustment for us at the appropriate time. */
|
adjustment for us at the appropriate time. */
|
event_child->pending_is_breakpoint = 1;
|
event_child->pending_is_breakpoint = 1;
|
event_child->pending_stop_pc = stop_pc;
|
event_child->pending_stop_pc = stop_pc;
|
|
|
/* We may need to put the breakpoint back. We continue in the event
|
/* We may need to put the breakpoint back. We continue in the event
|
loop instead of simply replacing the breakpoint right away,
|
loop instead of simply replacing the breakpoint right away,
|
in order to not lose signals sent to the thread that hit the
|
in order to not lose signals sent to the thread that hit the
|
breakpoint. Unfortunately this increases the window where another
|
breakpoint. Unfortunately this increases the window where another
|
thread could sneak past the removed breakpoint. For the current
|
thread could sneak past the removed breakpoint. For the current
|
use of server-side breakpoints (thread creation) this is
|
use of server-side breakpoints (thread creation) this is
|
acceptable; but it needs to be considered before this breakpoint
|
acceptable; but it needs to be considered before this breakpoint
|
mechanism can be used in more general ways. For some breakpoints
|
mechanism can be used in more general ways. For some breakpoints
|
it may be necessary to stop all other threads, but that should
|
it may be necessary to stop all other threads, but that should
|
be avoided where possible.
|
be avoided where possible.
|
|
|
If breakpoint_reinsert_addr is NULL, that means that we can
|
If breakpoint_reinsert_addr is NULL, that means that we can
|
use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint,
|
use PTRACE_SINGLESTEP on this platform. Uninsert the breakpoint,
|
mark it for reinsertion, and single-step.
|
mark it for reinsertion, and single-step.
|
|
|
Otherwise, call the target function to figure out where we need
|
Otherwise, call the target function to figure out where we need
|
our temporary breakpoint, create it, and continue executing this
|
our temporary breakpoint, create it, and continue executing this
|
process. */
|
process. */
|
if (bp_status == 2)
|
if (bp_status == 2)
|
/* No need to reinsert. */
|
/* No need to reinsert. */
|
linux_resume_one_process (&event_child->head, 0, 0, NULL);
|
linux_resume_one_process (&event_child->head, 0, 0, NULL);
|
else if (the_low_target.breakpoint_reinsert_addr == NULL)
|
else if (the_low_target.breakpoint_reinsert_addr == NULL)
|
{
|
{
|
event_child->bp_reinsert = stop_pc;
|
event_child->bp_reinsert = stop_pc;
|
uninsert_breakpoint (stop_pc);
|
uninsert_breakpoint (stop_pc);
|
linux_resume_one_process (&event_child->head, 1, 0, NULL);
|
linux_resume_one_process (&event_child->head, 1, 0, NULL);
|
}
|
}
|
else
|
else
|
{
|
{
|
reinsert_breakpoint_by_bp
|
reinsert_breakpoint_by_bp
|
(stop_pc, (*the_low_target.breakpoint_reinsert_addr) ());
|
(stop_pc, (*the_low_target.breakpoint_reinsert_addr) ());
|
linux_resume_one_process (&event_child->head, 0, 0, NULL);
|
linux_resume_one_process (&event_child->head, 0, 0, NULL);
|
}
|
}
|
|
|
continue;
|
continue;
|
}
|
}
|
|
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "Hit a non-gdbserver breakpoint.\n");
|
fprintf (stderr, "Hit a non-gdbserver breakpoint.\n");
|
|
|
/* If we were single-stepping, we definitely want to report the
|
/* If we were single-stepping, we definitely want to report the
|
SIGTRAP. The single-step operation has completed, so also
|
SIGTRAP. The single-step operation has completed, so also
|
clear the stepping flag; in general this does not matter,
|
clear the stepping flag; in general this does not matter,
|
because the SIGTRAP will be reported to the client, which
|
because the SIGTRAP will be reported to the client, which
|
will give us a new action for this thread, but clear it for
|
will give us a new action for this thread, but clear it for
|
consistency anyway. It's safe to clear the stepping flag
|
consistency anyway. It's safe to clear the stepping flag
|
because the only consumer of get_stop_pc () after this point
|
because the only consumer of get_stop_pc () after this point
|
is check_removed_breakpoint, and pending_is_breakpoint is not
|
is check_removed_breakpoint, and pending_is_breakpoint is not
|
set. It might be wiser to use a step_completed flag instead. */
|
set. It might be wiser to use a step_completed flag instead. */
|
if (event_child->stepping)
|
if (event_child->stepping)
|
{
|
{
|
event_child->stepping = 0;
|
event_child->stepping = 0;
|
return wstat;
|
return wstat;
|
}
|
}
|
|
|
/* A SIGTRAP that we can't explain. It may have been a breakpoint.
|
/* A SIGTRAP that we can't explain. It may have been a breakpoint.
|
Check if it is a breakpoint, and if so mark the process information
|
Check if it is a breakpoint, and if so mark the process information
|
accordingly. This will handle both the necessary fiddling with the
|
accordingly. This will handle both the necessary fiddling with the
|
PC on decr_pc_after_break targets and suppressing extra threads
|
PC on decr_pc_after_break targets and suppressing extra threads
|
hitting a breakpoint if two hit it at once and then GDB removes it
|
hitting a breakpoint if two hit it at once and then GDB removes it
|
after the first is reported. Arguably it would be better to report
|
after the first is reported. Arguably it would be better to report
|
multiple threads hitting breakpoints simultaneously, but the current
|
multiple threads hitting breakpoints simultaneously, but the current
|
remote protocol does not allow this. */
|
remote protocol does not allow this. */
|
if ((*the_low_target.breakpoint_at) (stop_pc))
|
if ((*the_low_target.breakpoint_at) (stop_pc))
|
{
|
{
|
event_child->pending_is_breakpoint = 1;
|
event_child->pending_is_breakpoint = 1;
|
event_child->pending_stop_pc = stop_pc;
|
event_child->pending_stop_pc = stop_pc;
|
}
|
}
|
|
|
return wstat;
|
return wstat;
|
}
|
}
|
|
|
/* NOTREACHED */
|
/* NOTREACHED */
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Wait for process, returns status. */
|
/* Wait for process, returns status. */
|
|
|
static unsigned char
|
static unsigned char
|
linux_wait (char *status)
|
linux_wait (char *status)
|
{
|
{
|
int w;
|
int w;
|
struct thread_info *child = NULL;
|
struct thread_info *child = NULL;
|
|
|
retry:
|
retry:
|
/* If we were only supposed to resume one thread, only wait for
|
/* If we were only supposed to resume one thread, only wait for
|
that thread - if it's still alive. If it died, however - which
|
that thread - if it's still alive. If it died, however - which
|
can happen if we're coming from the thread death case below -
|
can happen if we're coming from the thread death case below -
|
then we need to make sure we restart the other threads. We could
|
then we need to make sure we restart the other threads. We could
|
pick a thread at random or restart all; restarting all is less
|
pick a thread at random or restart all; restarting all is less
|
arbitrary. */
|
arbitrary. */
|
if (cont_thread != 0 && cont_thread != -1)
|
if (cont_thread != 0 && cont_thread != -1)
|
{
|
{
|
child = (struct thread_info *) find_inferior_id (&all_threads,
|
child = (struct thread_info *) find_inferior_id (&all_threads,
|
cont_thread);
|
cont_thread);
|
|
|
/* No stepping, no signal - unless one is pending already, of course. */
|
/* No stepping, no signal - unless one is pending already, of course. */
|
if (child == NULL)
|
if (child == NULL)
|
{
|
{
|
struct thread_resume resume_info;
|
struct thread_resume resume_info;
|
resume_info.thread = -1;
|
resume_info.thread = -1;
|
resume_info.step = resume_info.sig = resume_info.leave_stopped = 0;
|
resume_info.step = resume_info.sig = resume_info.leave_stopped = 0;
|
linux_resume (&resume_info);
|
linux_resume (&resume_info);
|
}
|
}
|
}
|
}
|
|
|
w = linux_wait_for_event (child);
|
w = linux_wait_for_event (child);
|
stop_all_processes ();
|
stop_all_processes ();
|
|
|
if (must_set_ptrace_flags)
|
if (must_set_ptrace_flags)
|
{
|
{
|
ptrace (PTRACE_SETOPTIONS, inferior_pid, 0, PTRACE_O_TRACECLONE);
|
ptrace (PTRACE_SETOPTIONS, inferior_pid, 0, PTRACE_O_TRACECLONE);
|
must_set_ptrace_flags = 0;
|
must_set_ptrace_flags = 0;
|
}
|
}
|
|
|
/* If we are waiting for a particular child, and it exited,
|
/* If we are waiting for a particular child, and it exited,
|
linux_wait_for_event will return its exit status. Similarly if
|
linux_wait_for_event will return its exit status. Similarly if
|
the last child exited. If this is not the last child, however,
|
the last child exited. If this is not the last child, however,
|
do not report it as exited until there is a 'thread exited' response
|
do not report it as exited until there is a 'thread exited' response
|
available in the remote protocol. Instead, just wait for another event.
|
available in the remote protocol. Instead, just wait for another event.
|
This should be safe, because if the thread crashed we will already
|
This should be safe, because if the thread crashed we will already
|
have reported the termination signal to GDB; that should stop any
|
have reported the termination signal to GDB; that should stop any
|
in-progress stepping operations, etc.
|
in-progress stepping operations, etc.
|
|
|
Report the exit status of the last thread to exit. This matches
|
Report the exit status of the last thread to exit. This matches
|
LinuxThreads' behavior. */
|
LinuxThreads' behavior. */
|
|
|
if (all_threads.head == all_threads.tail)
|
if (all_threads.head == all_threads.tail)
|
{
|
{
|
if (WIFEXITED (w))
|
if (WIFEXITED (w))
|
{
|
{
|
fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
|
fprintf (stderr, "\nChild exited with retcode = %x \n", WEXITSTATUS (w));
|
*status = 'W';
|
*status = 'W';
|
clear_inferiors ();
|
clear_inferiors ();
|
free (all_processes.head);
|
free (all_processes.head);
|
all_processes.head = all_processes.tail = NULL;
|
all_processes.head = all_processes.tail = NULL;
|
return WEXITSTATUS (w);
|
return WEXITSTATUS (w);
|
}
|
}
|
else if (!WIFSTOPPED (w))
|
else if (!WIFSTOPPED (w))
|
{
|
{
|
fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
|
fprintf (stderr, "\nChild terminated with signal = %x \n", WTERMSIG (w));
|
*status = 'X';
|
*status = 'X';
|
clear_inferiors ();
|
clear_inferiors ();
|
free (all_processes.head);
|
free (all_processes.head);
|
all_processes.head = all_processes.tail = NULL;
|
all_processes.head = all_processes.tail = NULL;
|
return target_signal_from_host (WTERMSIG (w));
|
return target_signal_from_host (WTERMSIG (w));
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
if (!WIFSTOPPED (w))
|
if (!WIFSTOPPED (w))
|
goto retry;
|
goto retry;
|
}
|
}
|
|
|
*status = 'T';
|
*status = 'T';
|
return target_signal_from_host (WSTOPSIG (w));
|
return target_signal_from_host (WSTOPSIG (w));
|
}
|
}
|
|
|
/* Send a signal to an LWP. For LinuxThreads, kill is enough; however, if
|
/* Send a signal to an LWP. For LinuxThreads, kill is enough; however, if
|
thread groups are in use, we need to use tkill. */
|
thread groups are in use, we need to use tkill. */
|
|
|
static int
|
static int
|
kill_lwp (unsigned long lwpid, int signo)
|
kill_lwp (unsigned long lwpid, int signo)
|
{
|
{
|
static int tkill_failed;
|
static int tkill_failed;
|
|
|
errno = 0;
|
errno = 0;
|
|
|
#ifdef SYS_tkill
|
#ifdef SYS_tkill
|
if (!tkill_failed)
|
if (!tkill_failed)
|
{
|
{
|
int ret = syscall (SYS_tkill, lwpid, signo);
|
int ret = syscall (SYS_tkill, lwpid, signo);
|
if (errno != ENOSYS)
|
if (errno != ENOSYS)
|
return ret;
|
return ret;
|
errno = 0;
|
errno = 0;
|
tkill_failed = 1;
|
tkill_failed = 1;
|
}
|
}
|
#endif
|
#endif
|
|
|
return kill (lwpid, signo);
|
return kill (lwpid, signo);
|
}
|
}
|
|
|
static void
|
static void
|
send_sigstop (struct inferior_list_entry *entry)
|
send_sigstop (struct inferior_list_entry *entry)
|
{
|
{
|
struct process_info *process = (struct process_info *) entry;
|
struct process_info *process = (struct process_info *) entry;
|
|
|
if (process->stopped)
|
if (process->stopped)
|
return;
|
return;
|
|
|
/* If we already have a pending stop signal for this process, don't
|
/* If we already have a pending stop signal for this process, don't
|
send another. */
|
send another. */
|
if (process->stop_expected)
|
if (process->stop_expected)
|
{
|
{
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "Have pending sigstop for process %ld\n",
|
fprintf (stderr, "Have pending sigstop for process %ld\n",
|
process->lwpid);
|
process->lwpid);
|
|
|
/* We clear the stop_expected flag so that wait_for_sigstop
|
/* We clear the stop_expected flag so that wait_for_sigstop
|
will receive the SIGSTOP event (instead of silently resuming and
|
will receive the SIGSTOP event (instead of silently resuming and
|
waiting again). It'll be reset below. */
|
waiting again). It'll be reset below. */
|
process->stop_expected = 0;
|
process->stop_expected = 0;
|
return;
|
return;
|
}
|
}
|
|
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "Sending sigstop to process %ld\n", process->head.id);
|
fprintf (stderr, "Sending sigstop to process %ld\n", process->head.id);
|
|
|
kill_lwp (process->head.id, SIGSTOP);
|
kill_lwp (process->head.id, SIGSTOP);
|
}
|
}
|
|
|
static void
|
static void
|
wait_for_sigstop (struct inferior_list_entry *entry)
|
wait_for_sigstop (struct inferior_list_entry *entry)
|
{
|
{
|
struct process_info *process = (struct process_info *) entry;
|
struct process_info *process = (struct process_info *) entry;
|
struct thread_info *saved_inferior, *thread;
|
struct thread_info *saved_inferior, *thread;
|
int wstat;
|
int wstat;
|
unsigned long saved_tid;
|
unsigned long saved_tid;
|
|
|
if (process->stopped)
|
if (process->stopped)
|
return;
|
return;
|
|
|
saved_inferior = current_inferior;
|
saved_inferior = current_inferior;
|
saved_tid = ((struct inferior_list_entry *) saved_inferior)->id;
|
saved_tid = ((struct inferior_list_entry *) saved_inferior)->id;
|
thread = (struct thread_info *) find_inferior_id (&all_threads,
|
thread = (struct thread_info *) find_inferior_id (&all_threads,
|
process->lwpid);
|
process->lwpid);
|
wstat = linux_wait_for_event (thread);
|
wstat = linux_wait_for_event (thread);
|
|
|
/* If we stopped with a non-SIGSTOP signal, save it for later
|
/* If we stopped with a non-SIGSTOP signal, save it for later
|
and record the pending SIGSTOP. If the process exited, just
|
and record the pending SIGSTOP. If the process exited, just
|
return. */
|
return. */
|
if (WIFSTOPPED (wstat)
|
if (WIFSTOPPED (wstat)
|
&& WSTOPSIG (wstat) != SIGSTOP)
|
&& WSTOPSIG (wstat) != SIGSTOP)
|
{
|
{
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n",
|
fprintf (stderr, "LWP %ld stopped with non-sigstop status %06x\n",
|
process->lwpid, wstat);
|
process->lwpid, wstat);
|
process->status_pending_p = 1;
|
process->status_pending_p = 1;
|
process->status_pending = wstat;
|
process->status_pending = wstat;
|
process->stop_expected = 1;
|
process->stop_expected = 1;
|
}
|
}
|
|
|
if (linux_thread_alive (saved_tid))
|
if (linux_thread_alive (saved_tid))
|
current_inferior = saved_inferior;
|
current_inferior = saved_inferior;
|
else
|
else
|
{
|
{
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "Previously current thread died.\n");
|
fprintf (stderr, "Previously current thread died.\n");
|
|
|
/* Set a valid thread as current. */
|
/* Set a valid thread as current. */
|
set_desired_inferior (0);
|
set_desired_inferior (0);
|
}
|
}
|
}
|
}
|
|
|
static void
|
static void
|
stop_all_processes (void)
|
stop_all_processes (void)
|
{
|
{
|
stopping_threads = 1;
|
stopping_threads = 1;
|
for_each_inferior (&all_processes, send_sigstop);
|
for_each_inferior (&all_processes, send_sigstop);
|
for_each_inferior (&all_processes, wait_for_sigstop);
|
for_each_inferior (&all_processes, wait_for_sigstop);
|
stopping_threads = 0;
|
stopping_threads = 0;
|
}
|
}
|
|
|
/* Resume execution of the inferior process.
|
/* Resume execution of the inferior process.
|
If STEP is nonzero, single-step it.
|
If STEP is nonzero, single-step it.
|
If SIGNAL is nonzero, give it that signal. */
|
If SIGNAL is nonzero, give it that signal. */
|
|
|
static void
|
static void
|
linux_resume_one_process (struct inferior_list_entry *entry,
|
linux_resume_one_process (struct inferior_list_entry *entry,
|
int step, int signal, siginfo_t *info)
|
int step, int signal, siginfo_t *info)
|
{
|
{
|
struct process_info *process = (struct process_info *) entry;
|
struct process_info *process = (struct process_info *) entry;
|
struct thread_info *saved_inferior;
|
struct thread_info *saved_inferior;
|
|
|
if (process->stopped == 0)
|
if (process->stopped == 0)
|
return;
|
return;
|
|
|
/* If we have pending signals or status, and a new signal, enqueue the
|
/* If we have pending signals or status, and a new signal, enqueue the
|
signal. Also enqueue the signal if we are waiting to reinsert a
|
signal. Also enqueue the signal if we are waiting to reinsert a
|
breakpoint; it will be picked up again below. */
|
breakpoint; it will be picked up again below. */
|
if (signal != 0
|
if (signal != 0
|
&& (process->status_pending_p || process->pending_signals != NULL
|
&& (process->status_pending_p || process->pending_signals != NULL
|
|| process->bp_reinsert != 0))
|
|| process->bp_reinsert != 0))
|
{
|
{
|
struct pending_signals *p_sig;
|
struct pending_signals *p_sig;
|
p_sig = malloc (sizeof (*p_sig));
|
p_sig = malloc (sizeof (*p_sig));
|
p_sig->prev = process->pending_signals;
|
p_sig->prev = process->pending_signals;
|
p_sig->signal = signal;
|
p_sig->signal = signal;
|
if (info == NULL)
|
if (info == NULL)
|
memset (&p_sig->info, 0, sizeof (siginfo_t));
|
memset (&p_sig->info, 0, sizeof (siginfo_t));
|
else
|
else
|
memcpy (&p_sig->info, info, sizeof (siginfo_t));
|
memcpy (&p_sig->info, info, sizeof (siginfo_t));
|
process->pending_signals = p_sig;
|
process->pending_signals = p_sig;
|
}
|
}
|
|
|
if (process->status_pending_p && !check_removed_breakpoint (process))
|
if (process->status_pending_p && !check_removed_breakpoint (process))
|
return;
|
return;
|
|
|
saved_inferior = current_inferior;
|
saved_inferior = current_inferior;
|
current_inferior = get_process_thread (process);
|
current_inferior = get_process_thread (process);
|
|
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, "Resuming process %ld (%s, signal %d, stop %s)\n", inferior_pid,
|
fprintf (stderr, "Resuming process %ld (%s, signal %d, stop %s)\n", inferior_pid,
|
step ? "step" : "continue", signal,
|
step ? "step" : "continue", signal,
|
process->stop_expected ? "expected" : "not expected");
|
process->stop_expected ? "expected" : "not expected");
|
|
|
/* This bit needs some thinking about. If we get a signal that
|
/* This bit needs some thinking about. If we get a signal that
|
we must report while a single-step reinsert is still pending,
|
we must report while a single-step reinsert is still pending,
|
we often end up resuming the thread. It might be better to
|
we often end up resuming the thread. It might be better to
|
(ew) allow a stack of pending events; then we could be sure that
|
(ew) allow a stack of pending events; then we could be sure that
|
the reinsert happened right away and not lose any signals.
|
the reinsert happened right away and not lose any signals.
|
|
|
Making this stack would also shrink the window in which breakpoints are
|
Making this stack would also shrink the window in which breakpoints are
|
uninserted (see comment in linux_wait_for_process) but not enough for
|
uninserted (see comment in linux_wait_for_process) but not enough for
|
complete correctness, so it won't solve that problem. It may be
|
complete correctness, so it won't solve that problem. It may be
|
worthwhile just to solve this one, however. */
|
worthwhile just to solve this one, however. */
|
if (process->bp_reinsert != 0)
|
if (process->bp_reinsert != 0)
|
{
|
{
|
if (debug_threads)
|
if (debug_threads)
|
fprintf (stderr, " pending reinsert at %08lx", (long)process->bp_reinsert);
|
fprintf (stderr, " pending reinsert at %08lx", (long)process->bp_reinsert);
|
if (step == 0)
|
if (step == 0)
|
fprintf (stderr, "BAD - reinserting but not stepping.\n");
|
fprintf (stderr, "BAD - reinserting but not stepping.\n");
|
step = 1;
|
step = 1;
|
|
|
/* Postpone any pending signal. It was enqueued above. */
|
/* Postpone any pending signal. It was enqueued above. */
|
signal = 0;
|
signal = 0;
|
}
|
}
|
|
|
check_removed_breakpoint (process);
|
check_removed_breakpoint (process);
|
|
|
if (debug_threads && the_low_target.get_pc != NULL)
|
if (debug_threads && the_low_target.get_pc != NULL)
|
{
|
{
|
fprintf (stderr, " ");
|
fprintf (stderr, " ");
|
(*the_low_target.get_pc) ();
|
(*the_low_target.get_pc) ();
|
}
|
}
|
|
|
/* If we have pending signals, consume one unless we are trying to reinsert
|
/* If we have pending signals, consume one unless we are trying to reinsert
|
a breakpoint. */
|
a breakpoint. */
|
if (process->pending_signals != NULL && process->bp_reinsert == 0)
|
if (process->pending_signals != NULL && process->bp_reinsert == 0)
|
{
|
{
|
struct pending_signals **p_sig;
|
struct pending_signals **p_sig;
|
|
|
p_sig = &process->pending_signals;
|
p_sig = &process->pending_signals;
|
while ((*p_sig)->prev != NULL)
|
while ((*p_sig)->prev != NULL)
|
p_sig = &(*p_sig)->prev;
|
p_sig = &(*p_sig)->prev;
|
|
|
signal = (*p_sig)->signal;
|
signal = (*p_sig)->signal;
|
if ((*p_sig)->info.si_signo != 0)
|
if ((*p_sig)->info.si_signo != 0)
|
ptrace (PTRACE_SETSIGINFO, process->lwpid, 0, &(*p_sig)->info);
|
ptrace (PTRACE_SETSIGINFO, process->lwpid, 0, &(*p_sig)->info);
|
|
|
free (*p_sig);
|
free (*p_sig);
|
*p_sig = NULL;
|
*p_sig = NULL;
|
}
|
}
|
|
|
regcache_invalidate_one ((struct inferior_list_entry *)
|
regcache_invalidate_one ((struct inferior_list_entry *)
|
get_process_thread (process));
|
get_process_thread (process));
|
errno = 0;
|
errno = 0;
|
process->stopped = 0;
|
process->stopped = 0;
|
process->stepping = step;
|
process->stepping = step;
|
ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, process->lwpid, 0, signal);
|
ptrace (step ? PTRACE_SINGLESTEP : PTRACE_CONT, process->lwpid, 0, signal);
|
|
|
current_inferior = saved_inferior;
|
current_inferior = saved_inferior;
|
if (errno)
|
if (errno)
|
perror_with_name ("ptrace");
|
perror_with_name ("ptrace");
|
}
|
}
|
|
|
static struct thread_resume *resume_ptr;
|
static struct thread_resume *resume_ptr;
|
|
|
/* This function is called once per thread. We look up the thread
|
/* This function is called once per thread. We look up the thread
|
in RESUME_PTR, and mark the thread with a pointer to the appropriate
|
in RESUME_PTR, and mark the thread with a pointer to the appropriate
|
resume request.
|
resume request.
|
|
|
This algorithm is O(threads * resume elements), but resume elements
|
This algorithm is O(threads * resume elements), but resume elements
|
is small (and will remain small at least until GDB supports thread
|
is small (and will remain small at least until GDB supports thread
|
suspension). */
|
suspension). */
|
static void
|
static void
|
linux_set_resume_request (struct inferior_list_entry *entry)
|
linux_set_resume_request (struct inferior_list_entry *entry)
|
{
|
{
|
struct process_info *process;
|
struct process_info *process;
|
struct thread_info *thread;
|
struct thread_info *thread;
|
int ndx;
|
int ndx;
|
|
|
thread = (struct thread_info *) entry;
|
thread = (struct thread_info *) entry;
|
process = get_thread_process (thread);
|
process = get_thread_process (thread);
|
|
|
ndx = 0;
|
ndx = 0;
|
while (resume_ptr[ndx].thread != -1 && resume_ptr[ndx].thread != entry->id)
|
while (resume_ptr[ndx].thread != -1 && resume_ptr[ndx].thread != entry->id)
|
ndx++;
|
ndx++;
|
|
|
process->resume = &resume_ptr[ndx];
|
process->resume = &resume_ptr[ndx];
|
}
|
}
|
|
|
/* This function is called once per thread. We check the thread's resume
|
/* This function is called once per thread. We check the thread's resume
|
request, which will tell us whether to resume, step, or leave the thread
|
request, which will tell us whether to resume, step, or leave the thread
|
stopped; and what signal, if any, it should be sent. For threads which
|
stopped; and what signal, if any, it should be sent. For threads which
|
we aren't explicitly told otherwise, we preserve the stepping flag; this
|
we aren't explicitly told otherwise, we preserve the stepping flag; this
|
is used for stepping over gdbserver-placed breakpoints. */
|
is used for stepping over gdbserver-placed breakpoints. */
|
|
|
static void
|
static void
|
linux_continue_one_thread (struct inferior_list_entry *entry)
|
linux_continue_one_thread (struct inferior_list_entry *entry)
|
{
|
{
|
struct process_info *process;
|
struct process_info *process;
|
struct thread_info *thread;
|
struct thread_info *thread;
|
int step;
|
int step;
|
|
|
thread = (struct thread_info *) entry;
|
thread = (struct thread_info *) entry;
|
process = get_thread_process (thread);
|
process = get_thread_process (thread);
|
|
|
if (process->resume->leave_stopped)
|
if (process->resume->leave_stopped)
|
return;
|
return;
|
|
|
if (process->resume->thread == -1)
|
if (process->resume->thread == -1)
|
step = process->stepping || process->resume->step;
|
step = process->stepping || process->resume->step;
|
else
|
else
|
step = process->resume->step;
|
step = process->resume->step;
|
|
|
linux_resume_one_process (&process->head, step, process->resume->sig, NULL);
|
linux_resume_one_process (&process->head, step, process->resume->sig, NULL);
|
|
|
process->resume = NULL;
|
process->resume = NULL;
|
}
|
}
|
|
|
/* This function is called once per thread. We check the thread's resume
|
/* This function is called once per thread. We check the thread's resume
|
request, which will tell us whether to resume, step, or leave the thread
|
request, which will tell us whether to resume, step, or leave the thread
|
stopped; and what signal, if any, it should be sent. We queue any needed
|
stopped; and what signal, if any, it should be sent. We queue any needed
|
signals, since we won't actually resume. We already have a pending event
|
signals, since we won't actually resume. We already have a pending event
|
to report, so we don't need to preserve any step requests; they should
|
to report, so we don't need to preserve any step requests; they should
|
be re-issued if necessary. */
|
be re-issued if necessary. */
|
|
|
static void
|
static void
|
linux_queue_one_thread (struct inferior_list_entry *entry)
|
linux_queue_one_thread (struct inferior_list_entry *entry)
|
{
|
{
|
struct process_info *process;
|
struct process_info *process;
|
struct thread_info *thread;
|
struct thread_info *thread;
|
|
|
thread = (struct thread_info *) entry;
|
thread = (struct thread_info *) entry;
|
process = get_thread_process (thread);
|
process = get_thread_process (thread);
|
|
|
if (process->resume->leave_stopped)
|
if (process->resume->leave_stopped)
|
return;
|
return;
|
|
|
/* If we have a new signal, enqueue the signal. */
|
/* If we have a new signal, enqueue the signal. */
|
if (process->resume->sig != 0)
|
if (process->resume->sig != 0)
|
{
|
{
|
struct pending_signals *p_sig;
|
struct pending_signals *p_sig;
|
p_sig = malloc (sizeof (*p_sig));
|
p_sig = malloc (sizeof (*p_sig));
|
p_sig->prev = process->pending_signals;
|
p_sig->prev = process->pending_signals;
|
p_sig->signal = process->resume->sig;
|
p_sig->signal = process->resume->sig;
|
memset (&p_sig->info, 0, sizeof (siginfo_t));
|
memset (&p_sig->info, 0, sizeof (siginfo_t));
|
|
|
/* If this is the same signal we were previously stopped by,
|
/* If this is the same signal we were previously stopped by,
|
make sure to queue its siginfo. We can ignore the return
|
make sure to queue its siginfo. We can ignore the return
|
value of ptrace; if it fails, we'll skip
|
value of ptrace; if it fails, we'll skip
|
PTRACE_SETSIGINFO. */
|
PTRACE_SETSIGINFO. */
|
if (WIFSTOPPED (process->last_status)
|
if (WIFSTOPPED (process->last_status)
|
&& WSTOPSIG (process->last_status) == process->resume->sig)
|
&& WSTOPSIG (process->last_status) == process->resume->sig)
|
ptrace (PTRACE_GETSIGINFO, process->lwpid, 0, &p_sig->info);
|
ptrace (PTRACE_GETSIGINFO, process->lwpid, 0, &p_sig->info);
|
|
|
process->pending_signals = p_sig;
|
process->pending_signals = p_sig;
|
}
|
}
|
|
|
process->resume = NULL;
|
process->resume = NULL;
|
}
|
}
|
|
|
/* Set DUMMY if this process has an interesting status pending. */
|
/* Set DUMMY if this process has an interesting status pending. */
|
static int
|
static int
|
resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p)
|
resume_status_pending_p (struct inferior_list_entry *entry, void *flag_p)
|
{
|
{
|
struct process_info *process = (struct process_info *) entry;
|
struct process_info *process = (struct process_info *) entry;
|
|
|
/* Processes which will not be resumed are not interesting, because
|
/* Processes which will not be resumed are not interesting, because
|
we might not wait for them next time through linux_wait. */
|
we might not wait for them next time through linux_wait. */
|
if (process->resume->leave_stopped)
|
if (process->resume->leave_stopped)
|
return 0;
|
return 0;
|
|
|
/* If this thread has a removed breakpoint, we won't have any
|
/* If this thread has a removed breakpoint, we won't have any
|
events to report later, so check now. check_removed_breakpoint
|
events to report later, so check now. check_removed_breakpoint
|
may clear status_pending_p. We avoid calling check_removed_breakpoint
|
may clear status_pending_p. We avoid calling check_removed_breakpoint
|
for any thread that we are not otherwise going to resume - this
|
for any thread that we are not otherwise going to resume - this
|
lets us preserve stopped status when two threads hit a breakpoint.
|
lets us preserve stopped status when two threads hit a breakpoint.
|
GDB removes the breakpoint to single-step a particular thread
|
GDB removes the breakpoint to single-step a particular thread
|
past it, then re-inserts it and resumes all threads. We want
|
past it, then re-inserts it and resumes all threads. We want
|
to report the second thread without resuming it in the interim. */
|
to report the second thread without resuming it in the interim. */
|
if (process->status_pending_p)
|
if (process->status_pending_p)
|
check_removed_breakpoint (process);
|
check_removed_breakpoint (process);
|
|
|
if (process->status_pending_p)
|
if (process->status_pending_p)
|
* (int *) flag_p = 1;
|
* (int *) flag_p = 1;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void
|
static void
|
linux_resume (struct thread_resume *resume_info)
|
linux_resume (struct thread_resume *resume_info)
|
{
|
{
|
int pending_flag;
|
int pending_flag;
|
|
|
/* Yes, the use of a global here is rather ugly. */
|
/* Yes, the use of a global here is rather ugly. */
|
resume_ptr = resume_info;
|
resume_ptr = resume_info;
|
|
|
for_each_inferior (&all_threads, linux_set_resume_request);
|
for_each_inferior (&all_threads, linux_set_resume_request);
|
|
|
/* If there is a thread which would otherwise be resumed, which
|
/* If there is a thread which would otherwise be resumed, which
|
has a pending status, then don't resume any threads - we can just
|
has a pending status, then don't resume any threads - we can just
|
report the pending status. Make sure to queue any signals
|
report the pending status. Make sure to queue any signals
|
that would otherwise be sent. */
|
that would otherwise be sent. */
|
pending_flag = 0;
|
pending_flag = 0;
|
find_inferior (&all_processes, resume_status_pending_p, &pending_flag);
|
find_inferior (&all_processes, resume_status_pending_p, &pending_flag);
|
|
|
if (debug_threads)
|
if (debug_threads)
|
{
|
{
|
if (pending_flag)
|
if (pending_flag)
|
fprintf (stderr, "Not resuming, pending status\n");
|
fprintf (stderr, "Not resuming, pending status\n");
|
else
|
else
|
fprintf (stderr, "Resuming, no pending status\n");
|
fprintf (stderr, "Resuming, no pending status\n");
|
}
|
}
|
|
|
if (pending_flag)
|
if (pending_flag)
|
for_each_inferior (&all_threads, linux_queue_one_thread);
|
for_each_inferior (&all_threads, linux_queue_one_thread);
|
else
|
else
|
for_each_inferior (&all_threads, linux_continue_one_thread);
|
for_each_inferior (&all_threads, linux_continue_one_thread);
|
}
|
}
|
|
|
#ifdef HAVE_LINUX_USRREGS
|
#ifdef HAVE_LINUX_USRREGS
|
|
|
int
|
int
|
register_addr (int regnum)
|
register_addr (int regnum)
|
{
|
{
|
int addr;
|
int addr;
|
|
|
if (regnum < 0 || regnum >= the_low_target.num_regs)
|
if (regnum < 0 || regnum >= the_low_target.num_regs)
|
error ("Invalid register number %d.", regnum);
|
error ("Invalid register number %d.", regnum);
|
|
|
addr = the_low_target.regmap[regnum];
|
addr = the_low_target.regmap[regnum];
|
|
|
return addr;
|
return addr;
|
}
|
}
|
|
|
/* Fetch one register. */
|
/* Fetch one register. */
|
static void
|
static void
|
fetch_register (int regno)
|
fetch_register (int regno)
|
{
|
{
|
CORE_ADDR regaddr;
|
CORE_ADDR regaddr;
|
int i, size;
|
int i, size;
|
char *buf;
|
char *buf;
|
|
|
if (regno >= the_low_target.num_regs)
|
if (regno >= the_low_target.num_regs)
|
return;
|
return;
|
if ((*the_low_target.cannot_fetch_register) (regno))
|
if ((*the_low_target.cannot_fetch_register) (regno))
|
return;
|
return;
|
|
|
regaddr = register_addr (regno);
|
regaddr = register_addr (regno);
|
if (regaddr == -1)
|
if (regaddr == -1)
|
return;
|
return;
|
size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1)
|
size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1)
|
& - sizeof (PTRACE_XFER_TYPE);
|
& - sizeof (PTRACE_XFER_TYPE);
|
buf = alloca (size);
|
buf = alloca (size);
|
for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE))
|
for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE))
|
{
|
{
|
errno = 0;
|
errno = 0;
|
*(PTRACE_XFER_TYPE *) (buf + i) =
|
*(PTRACE_XFER_TYPE *) (buf + i) =
|
ptrace (PTRACE_PEEKUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 0);
|
ptrace (PTRACE_PEEKUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr, 0);
|
regaddr += sizeof (PTRACE_XFER_TYPE);
|
regaddr += sizeof (PTRACE_XFER_TYPE);
|
if (errno != 0)
|
if (errno != 0)
|
{
|
{
|
/* Warning, not error, in case we are attached; sometimes the
|
/* Warning, not error, in case we are attached; sometimes the
|
kernel doesn't let us at the registers. */
|
kernel doesn't let us at the registers. */
|
char *err = strerror (errno);
|
char *err = strerror (errno);
|
char *msg = alloca (strlen (err) + 128);
|
char *msg = alloca (strlen (err) + 128);
|
sprintf (msg, "reading register %d: %s", regno, err);
|
sprintf (msg, "reading register %d: %s", regno, err);
|
error (msg);
|
error (msg);
|
goto error_exit;
|
goto error_exit;
|
}
|
}
|
}
|
}
|
if (the_low_target.left_pad_xfer
|
if (the_low_target.left_pad_xfer
|
&& register_size (regno) < sizeof (PTRACE_XFER_TYPE))
|
&& register_size (regno) < sizeof (PTRACE_XFER_TYPE))
|
supply_register (regno, (buf + sizeof (PTRACE_XFER_TYPE)
|
supply_register (regno, (buf + sizeof (PTRACE_XFER_TYPE)
|
- register_size (regno)));
|
- register_size (regno)));
|
else
|
else
|
supply_register (regno, buf);
|
supply_register (regno, buf);
|
|
|
error_exit:;
|
error_exit:;
|
}
|
}
|
|
|
/* Fetch all registers, or just one, from the child process. */
|
/* Fetch all registers, or just one, from the child process. */
|
static void
|
static void
|
usr_fetch_inferior_registers (int regno)
|
usr_fetch_inferior_registers (int regno)
|
{
|
{
|
if (regno == -1 || regno == 0)
|
if (regno == -1 || regno == 0)
|
for (regno = 0; regno < the_low_target.num_regs; regno++)
|
for (regno = 0; regno < the_low_target.num_regs; regno++)
|
fetch_register (regno);
|
fetch_register (regno);
|
else
|
else
|
fetch_register (regno);
|
fetch_register (regno);
|
}
|
}
|
|
|
/* Store our register values back into the inferior.
|
/* Store our register values back into the inferior.
|
If REGNO is -1, do this for all registers.
|
If REGNO is -1, do this for all registers.
|
Otherwise, REGNO specifies which register (so we can save time). */
|
Otherwise, REGNO specifies which register (so we can save time). */
|
static void
|
static void
|
usr_store_inferior_registers (int regno)
|
usr_store_inferior_registers (int regno)
|
{
|
{
|
CORE_ADDR regaddr;
|
CORE_ADDR regaddr;
|
int i, size;
|
int i, size;
|
char *buf;
|
char *buf;
|
|
|
if (regno >= 0)
|
if (regno >= 0)
|
{
|
{
|
if (regno >= the_low_target.num_regs)
|
if (regno >= the_low_target.num_regs)
|
return;
|
return;
|
|
|
if ((*the_low_target.cannot_store_register) (regno) == 1)
|
if ((*the_low_target.cannot_store_register) (regno) == 1)
|
return;
|
return;
|
|
|
regaddr = register_addr (regno);
|
regaddr = register_addr (regno);
|
if (regaddr == -1)
|
if (regaddr == -1)
|
return;
|
return;
|
errno = 0;
|
errno = 0;
|
size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1)
|
size = (register_size (regno) + sizeof (PTRACE_XFER_TYPE) - 1)
|
& - sizeof (PTRACE_XFER_TYPE);
|
& - sizeof (PTRACE_XFER_TYPE);
|
buf = alloca (size);
|
buf = alloca (size);
|
memset (buf, 0, size);
|
memset (buf, 0, size);
|
if (the_low_target.left_pad_xfer
|
if (the_low_target.left_pad_xfer
|
&& register_size (regno) < sizeof (PTRACE_XFER_TYPE))
|
&& register_size (regno) < sizeof (PTRACE_XFER_TYPE))
|
collect_register (regno, (buf + sizeof (PTRACE_XFER_TYPE)
|
collect_register (regno, (buf + sizeof (PTRACE_XFER_TYPE)
|
- register_size (regno)));
|
- register_size (regno)));
|
else
|
else
|
collect_register (regno, buf);
|
collect_register (regno, buf);
|
for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE))
|
for (i = 0; i < size; i += sizeof (PTRACE_XFER_TYPE))
|
{
|
{
|
errno = 0;
|
errno = 0;
|
ptrace (PTRACE_POKEUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
|
ptrace (PTRACE_POKEUSER, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
|
*(PTRACE_XFER_TYPE *) (buf + i));
|
*(PTRACE_XFER_TYPE *) (buf + i));
|
if (errno != 0)
|
if (errno != 0)
|
{
|
{
|
if ((*the_low_target.cannot_store_register) (regno) == 0)
|
if ((*the_low_target.cannot_store_register) (regno) == 0)
|
{
|
{
|
char *err = strerror (errno);
|
char *err = strerror (errno);
|
char *msg = alloca (strlen (err) + 128);
|
char *msg = alloca (strlen (err) + 128);
|
sprintf (msg, "writing register %d: %s",
|
sprintf (msg, "writing register %d: %s",
|
regno, err);
|
regno, err);
|
error (msg);
|
error (msg);
|
return;
|
return;
|
}
|
}
|
}
|
}
|
regaddr += sizeof (PTRACE_XFER_TYPE);
|
regaddr += sizeof (PTRACE_XFER_TYPE);
|
}
|
}
|
}
|
}
|
else
|
else
|
for (regno = 0; regno < the_low_target.num_regs; regno++)
|
for (regno = 0; regno < the_low_target.num_regs; regno++)
|
usr_store_inferior_registers (regno);
|
usr_store_inferior_registers (regno);
|
}
|
}
|
#endif /* HAVE_LINUX_USRREGS */
|
#endif /* HAVE_LINUX_USRREGS */
|
|
|
|
|
|
|
#ifdef HAVE_LINUX_REGSETS
|
#ifdef HAVE_LINUX_REGSETS
|
|
|
static int
|
static int
|
regsets_fetch_inferior_registers ()
|
regsets_fetch_inferior_registers ()
|
{
|
{
|
struct regset_info *regset;
|
struct regset_info *regset;
|
int saw_general_regs = 0;
|
int saw_general_regs = 0;
|
|
|
regset = target_regsets;
|
regset = target_regsets;
|
|
|
while (regset->size >= 0)
|
while (regset->size >= 0)
|
{
|
{
|
void *buf;
|
void *buf;
|
int res;
|
int res;
|
|
|
if (regset->size == 0)
|
if (regset->size == 0)
|
{
|
{
|
regset ++;
|
regset ++;
|
continue;
|
continue;
|
}
|
}
|
|
|
buf = malloc (regset->size);
|
buf = malloc (regset->size);
|
res = ptrace (regset->get_request, inferior_pid, 0, buf);
|
res = ptrace (regset->get_request, inferior_pid, 0, buf);
|
if (res < 0)
|
if (res < 0)
|
{
|
{
|
if (errno == EIO)
|
if (errno == EIO)
|
{
|
{
|
/* If we get EIO on the first regset, do not try regsets again.
|
/* If we get EIO on the first regset, do not try regsets again.
|
If we get EIO on a later regset, disable that regset. */
|
If we get EIO on a later regset, disable that regset. */
|
if (regset == target_regsets)
|
if (regset == target_regsets)
|
{
|
{
|
use_regsets_p = 0;
|
use_regsets_p = 0;
|
return -1;
|
return -1;
|
}
|
}
|
else
|
else
|
{
|
{
|
regset->size = 0;
|
regset->size = 0;
|
continue;
|
continue;
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
char s[256];
|
char s[256];
|
sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%ld",
|
sprintf (s, "ptrace(regsets_fetch_inferior_registers) PID=%ld",
|
inferior_pid);
|
inferior_pid);
|
perror (s);
|
perror (s);
|
}
|
}
|
}
|
}
|
else if (regset->type == GENERAL_REGS)
|
else if (regset->type == GENERAL_REGS)
|
saw_general_regs = 1;
|
saw_general_regs = 1;
|
regset->store_function (buf);
|
regset->store_function (buf);
|
regset ++;
|
regset ++;
|
}
|
}
|
if (saw_general_regs)
|
if (saw_general_regs)
|
return 0;
|
return 0;
|
else
|
else
|
return 1;
|
return 1;
|
}
|
}
|
|
|
static int
|
static int
|
regsets_store_inferior_registers ()
|
regsets_store_inferior_registers ()
|
{
|
{
|
struct regset_info *regset;
|
struct regset_info *regset;
|
int saw_general_regs = 0;
|
int saw_general_regs = 0;
|
|
|
regset = target_regsets;
|
regset = target_regsets;
|
|
|
while (regset->size >= 0)
|
while (regset->size >= 0)
|
{
|
{
|
void *buf;
|
void *buf;
|
int res;
|
int res;
|
|
|
if (regset->size == 0)
|
if (regset->size == 0)
|
{
|
{
|
regset ++;
|
regset ++;
|
continue;
|
continue;
|
}
|
}
|
|
|
buf = malloc (regset->size);
|
buf = malloc (regset->size);
|
|
|
/* First fill the buffer with the current register set contents,
|
/* First fill the buffer with the current register set contents,
|
in case there are any items in the kernel's regset that are
|
in case there are any items in the kernel's regset that are
|
not in gdbserver's regcache. */
|
not in gdbserver's regcache. */
|
res = ptrace (regset->get_request, inferior_pid, 0, buf);
|
res = ptrace (regset->get_request, inferior_pid, 0, buf);
|
|
|
if (res == 0)
|
if (res == 0)
|
{
|
{
|
/* Then overlay our cached registers on that. */
|
/* Then overlay our cached registers on that. */
|
regset->fill_function (buf);
|
regset->fill_function (buf);
|
|
|
/* Only now do we write the register set. */
|
/* Only now do we write the register set. */
|
res = ptrace (regset->set_request, inferior_pid, 0, buf);
|
res = ptrace (regset->set_request, inferior_pid, 0, buf);
|
}
|
}
|
|
|
if (res < 0)
|
if (res < 0)
|
{
|
{
|
if (errno == EIO)
|
if (errno == EIO)
|
{
|
{
|
/* If we get EIO on the first regset, do not try regsets again.
|
/* If we get EIO on the first regset, do not try regsets again.
|
If we get EIO on a later regset, disable that regset. */
|
If we get EIO on a later regset, disable that regset. */
|
if (regset == target_regsets)
|
if (regset == target_regsets)
|
{
|
{
|
use_regsets_p = 0;
|
use_regsets_p = 0;
|
return -1;
|
return -1;
|
}
|
}
|
else
|
else
|
{
|
{
|
regset->size = 0;
|
regset->size = 0;
|
continue;
|
continue;
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
perror ("Warning: ptrace(regsets_store_inferior_registers)");
|
perror ("Warning: ptrace(regsets_store_inferior_registers)");
|
}
|
}
|
}
|
}
|
else if (regset->type == GENERAL_REGS)
|
else if (regset->type == GENERAL_REGS)
|
saw_general_regs = 1;
|
saw_general_regs = 1;
|
regset ++;
|
regset ++;
|
free (buf);
|
free (buf);
|
}
|
}
|
if (saw_general_regs)
|
if (saw_general_regs)
|
return 0;
|
return 0;
|
else
|
else
|
return 1;
|
return 1;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
#endif /* HAVE_LINUX_REGSETS */
|
#endif /* HAVE_LINUX_REGSETS */
|
|
|
|
|
void
|
void
|
linux_fetch_registers (int regno)
|
linux_fetch_registers (int regno)
|
{
|
{
|
#ifdef HAVE_LINUX_REGSETS
|
#ifdef HAVE_LINUX_REGSETS
|
if (use_regsets_p)
|
if (use_regsets_p)
|
{
|
{
|
if (regsets_fetch_inferior_registers () == 0)
|
if (regsets_fetch_inferior_registers () == 0)
|
return;
|
return;
|
}
|
}
|
#endif
|
#endif
|
#ifdef HAVE_LINUX_USRREGS
|
#ifdef HAVE_LINUX_USRREGS
|
usr_fetch_inferior_registers (regno);
|
usr_fetch_inferior_registers (regno);
|
#endif
|
#endif
|
}
|
}
|
|
|
void
|
void
|
linux_store_registers (int regno)
|
linux_store_registers (int regno)
|
{
|
{
|
#ifdef HAVE_LINUX_REGSETS
|
#ifdef HAVE_LINUX_REGSETS
|
if (use_regsets_p)
|
if (use_regsets_p)
|
{
|
{
|
if (regsets_store_inferior_registers () == 0)
|
if (regsets_store_inferior_registers () == 0)
|
return;
|
return;
|
}
|
}
|
#endif
|
#endif
|
#ifdef HAVE_LINUX_USRREGS
|
#ifdef HAVE_LINUX_USRREGS
|
usr_store_inferior_registers (regno);
|
usr_store_inferior_registers (regno);
|
#endif
|
#endif
|
}
|
}
|
|
|
|
|
/* Copy LEN bytes from inferior's memory starting at MEMADDR
|
/* Copy LEN bytes from inferior's memory starting at MEMADDR
|
to debugger memory starting at MYADDR. */
|
to debugger memory starting at MYADDR. */
|
|
|
static int
|
static int
|
linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
|
linux_read_memory (CORE_ADDR memaddr, unsigned char *myaddr, int len)
|
{
|
{
|
register int i;
|
register int i;
|
/* Round starting address down to longword boundary. */
|
/* Round starting address down to longword boundary. */
|
register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
|
register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
|
/* Round ending address up; get number of longwords that makes. */
|
/* Round ending address up; get number of longwords that makes. */
|
register int count
|
register int count
|
= (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
|
= (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
|
/ sizeof (PTRACE_XFER_TYPE);
|
/ sizeof (PTRACE_XFER_TYPE);
|
/* Allocate buffer of that many longwords. */
|
/* Allocate buffer of that many longwords. */
|
register PTRACE_XFER_TYPE *buffer
|
register PTRACE_XFER_TYPE *buffer
|
= (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
|
= (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
|
int fd;
|
int fd;
|
char filename[64];
|
char filename[64];
|
|
|
/* Try using /proc. Don't bother for one word. */
|
/* Try using /proc. Don't bother for one word. */
|
if (len >= 3 * sizeof (long))
|
if (len >= 3 * sizeof (long))
|
{
|
{
|
/* We could keep this file open and cache it - possibly one per
|
/* We could keep this file open and cache it - possibly one per
|
thread. That requires some juggling, but is even faster. */
|
thread. That requires some juggling, but is even faster. */
|
sprintf (filename, "/proc/%ld/mem", inferior_pid);
|
sprintf (filename, "/proc/%ld/mem", inferior_pid);
|
fd = open (filename, O_RDONLY | O_LARGEFILE);
|
fd = open (filename, O_RDONLY | O_LARGEFILE);
|
if (fd == -1)
|
if (fd == -1)
|
goto no_proc;
|
goto no_proc;
|
|
|
/* If pread64 is available, use it. It's faster if the kernel
|
/* If pread64 is available, use it. It's faster if the kernel
|
supports it (only one syscall), and it's 64-bit safe even on
|
supports it (only one syscall), and it's 64-bit safe even on
|
32-bit platforms (for instance, SPARC debugging a SPARC64
|
32-bit platforms (for instance, SPARC debugging a SPARC64
|
application). */
|
application). */
|
#ifdef HAVE_PREAD64
|
#ifdef HAVE_PREAD64
|
if (pread64 (fd, myaddr, len, memaddr) != len)
|
if (pread64 (fd, myaddr, len, memaddr) != len)
|
#else
|
#else
|
if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, memaddr, len) != len)
|
if (lseek (fd, memaddr, SEEK_SET) == -1 || read (fd, memaddr, len) != len)
|
#endif
|
#endif
|
{
|
{
|
close (fd);
|
close (fd);
|
goto no_proc;
|
goto no_proc;
|
}
|
}
|
|
|
close (fd);
|
close (fd);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
no_proc:
|
no_proc:
|
/* Read all the longwords */
|
/* Read all the longwords */
|
for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
|
for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
|
{
|
{
|
errno = 0;
|
errno = 0;
|
buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, 0);
|
buffer[i] = ptrace (PTRACE_PEEKTEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, 0);
|
if (errno)
|
if (errno)
|
return errno;
|
return errno;
|
}
|
}
|
|
|
/* Copy appropriate bytes out of the buffer. */
|
/* Copy appropriate bytes out of the buffer. */
|
memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), len);
|
memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), len);
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Copy LEN bytes of data from debugger memory at MYADDR
|
/* Copy LEN bytes of data from debugger memory at MYADDR
|
to inferior's memory at MEMADDR.
|
to inferior's memory at MEMADDR.
|
On failure (cannot write the inferior)
|
On failure (cannot write the inferior)
|
returns the value of errno. */
|
returns the value of errno. */
|
|
|
static int
|
static int
|
linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)
|
linux_write_memory (CORE_ADDR memaddr, const unsigned char *myaddr, int len)
|
{
|
{
|
register int i;
|
register int i;
|
/* Round starting address down to longword boundary. */
|
/* Round starting address down to longword boundary. */
|
register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
|
register CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
|
/* Round ending address up; get number of longwords that makes. */
|
/* Round ending address up; get number of longwords that makes. */
|
register int count
|
register int count
|
= (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE);
|
= (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1) / sizeof (PTRACE_XFER_TYPE);
|
/* Allocate buffer of that many longwords. */
|
/* Allocate buffer of that many longwords. */
|
register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
|
register PTRACE_XFER_TYPE *buffer = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
|
extern int errno;
|
extern int errno;
|
|
|
if (debug_threads)
|
if (debug_threads)
|
{
|
{
|
fprintf (stderr, "Writing %02x to %08lx\n", (unsigned)myaddr[0], (long)memaddr);
|
fprintf (stderr, "Writing %02x to %08lx\n", (unsigned)myaddr[0], (long)memaddr);
|
}
|
}
|
|
|
/* Fill start and end extra bytes of buffer with existing memory data. */
|
/* Fill start and end extra bytes of buffer with existing memory data. */
|
|
|
buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid,
|
buffer[0] = ptrace (PTRACE_PEEKTEXT, inferior_pid,
|
(PTRACE_ARG3_TYPE) addr, 0);
|
(PTRACE_ARG3_TYPE) addr, 0);
|
|
|
if (count > 1)
|
if (count > 1)
|
{
|
{
|
buffer[count - 1]
|
buffer[count - 1]
|
= ptrace (PTRACE_PEEKTEXT, inferior_pid,
|
= ptrace (PTRACE_PEEKTEXT, inferior_pid,
|
(PTRACE_ARG3_TYPE) (addr + (count - 1)
|
(PTRACE_ARG3_TYPE) (addr + (count - 1)
|
* sizeof (PTRACE_XFER_TYPE)),
|
* sizeof (PTRACE_XFER_TYPE)),
|
0);
|
0);
|
}
|
}
|
|
|
/* Copy data to be written over corresponding part of buffer */
|
/* Copy data to be written over corresponding part of buffer */
|
|
|
memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len);
|
memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)), myaddr, len);
|
|
|
/* Write the entire buffer. */
|
/* Write the entire buffer. */
|
|
|
for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
|
for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
|
{
|
{
|
errno = 0;
|
errno = 0;
|
ptrace (PTRACE_POKETEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, buffer[i]);
|
ptrace (PTRACE_POKETEXT, inferior_pid, (PTRACE_ARG3_TYPE) addr, buffer[i]);
|
if (errno)
|
if (errno)
|
return errno;
|
return errno;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int linux_supports_tracefork_flag;
|
static int linux_supports_tracefork_flag;
|
|
|
/* Helper functions for linux_test_for_tracefork, called via clone (). */
|
/* Helper functions for linux_test_for_tracefork, called via clone (). */
|
|
|
static int
|
static int
|
linux_tracefork_grandchild (void *arg)
|
linux_tracefork_grandchild (void *arg)
|
{
|
{
|
_exit (0);
|
_exit (0);
|
}
|
}
|
|
|
#define STACK_SIZE 4096
|
#define STACK_SIZE 4096
|
|
|
static int
|
static int
|
linux_tracefork_child (void *arg)
|
linux_tracefork_child (void *arg)
|
{
|
{
|
ptrace (PTRACE_TRACEME, 0, 0, 0);
|
ptrace (PTRACE_TRACEME, 0, 0, 0);
|
kill (getpid (), SIGSTOP);
|
kill (getpid (), SIGSTOP);
|
#ifdef __ia64__
|
#ifdef __ia64__
|
__clone2 (linux_tracefork_grandchild, arg, STACK_SIZE,
|
__clone2 (linux_tracefork_grandchild, arg, STACK_SIZE,
|
CLONE_VM | SIGCHLD, NULL);
|
CLONE_VM | SIGCHLD, NULL);
|
#else
|
#else
|
clone (linux_tracefork_grandchild, arg + STACK_SIZE,
|
clone (linux_tracefork_grandchild, arg + STACK_SIZE,
|
CLONE_VM | SIGCHLD, NULL);
|
CLONE_VM | SIGCHLD, NULL);
|
#endif
|
#endif
|
_exit (0);
|
_exit (0);
|
}
|
}
|
|
|
/* Wrapper function for waitpid which handles EINTR. */
|
/* Wrapper function for waitpid which handles EINTR. */
|
|
|
static int
|
static int
|
my_waitpid (int pid, int *status, int flags)
|
my_waitpid (int pid, int *status, int flags)
|
{
|
{
|
int ret;
|
int ret;
|
do
|
do
|
{
|
{
|
ret = waitpid (pid, status, flags);
|
ret = waitpid (pid, status, flags);
|
}
|
}
|
while (ret == -1 && errno == EINTR);
|
while (ret == -1 && errno == EINTR);
|
|
|
return ret;
|
return ret;
|
}
|
}
|
|
|
/* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make
|
/* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. Make
|
sure that we can enable the option, and that it had the desired
|
sure that we can enable the option, and that it had the desired
|
effect. */
|
effect. */
|
|
|
static void
|
static void
|
linux_test_for_tracefork (void)
|
linux_test_for_tracefork (void)
|
{
|
{
|
int child_pid, ret, status;
|
int child_pid, ret, status;
|
long second_pid;
|
long second_pid;
|
char *stack = malloc (STACK_SIZE * 4);
|
char *stack = malloc (STACK_SIZE * 4);
|
|
|
linux_supports_tracefork_flag = 0;
|
linux_supports_tracefork_flag = 0;
|
|
|
/* Use CLONE_VM instead of fork, to support uClinux (no MMU). */
|
/* Use CLONE_VM instead of fork, to support uClinux (no MMU). */
|
#ifdef __ia64__
|
#ifdef __ia64__
|
child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE,
|
child_pid = __clone2 (linux_tracefork_child, stack, STACK_SIZE,
|
CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2);
|
CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2);
|
#else
|
#else
|
child_pid = clone (linux_tracefork_child, stack + STACK_SIZE,
|
child_pid = clone (linux_tracefork_child, stack + STACK_SIZE,
|
CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2);
|
CLONE_VM | SIGCHLD, stack + STACK_SIZE * 2);
|
#endif
|
#endif
|
if (child_pid == -1)
|
if (child_pid == -1)
|
perror_with_name ("clone");
|
perror_with_name ("clone");
|
|
|
ret = my_waitpid (child_pid, &status, 0);
|
ret = my_waitpid (child_pid, &status, 0);
|
if (ret == -1)
|
if (ret == -1)
|
perror_with_name ("waitpid");
|
perror_with_name ("waitpid");
|
else if (ret != child_pid)
|
else if (ret != child_pid)
|
error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret);
|
error ("linux_test_for_tracefork: waitpid: unexpected result %d.", ret);
|
if (! WIFSTOPPED (status))
|
if (! WIFSTOPPED (status))
|
error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status);
|
error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status);
|
|
|
ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK);
|
ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK);
|
if (ret != 0)
|
if (ret != 0)
|
{
|
{
|
ret = ptrace (PTRACE_KILL, child_pid, 0, 0);
|
ret = ptrace (PTRACE_KILL, child_pid, 0, 0);
|
if (ret != 0)
|
if (ret != 0)
|
{
|
{
|
warning ("linux_test_for_tracefork: failed to kill child");
|
warning ("linux_test_for_tracefork: failed to kill child");
|
return;
|
return;
|
}
|
}
|
|
|
ret = my_waitpid (child_pid, &status, 0);
|
ret = my_waitpid (child_pid, &status, 0);
|
if (ret != child_pid)
|
if (ret != child_pid)
|
warning ("linux_test_for_tracefork: failed to wait for killed child");
|
warning ("linux_test_for_tracefork: failed to wait for killed child");
|
else if (!WIFSIGNALED (status))
|
else if (!WIFSIGNALED (status))
|
warning ("linux_test_for_tracefork: unexpected wait status 0x%x from "
|
warning ("linux_test_for_tracefork: unexpected wait status 0x%x from "
|
"killed child", status);
|
"killed child", status);
|
|
|
return;
|
return;
|
}
|
}
|
|
|
ret = ptrace (PTRACE_CONT, child_pid, 0, 0);
|
ret = ptrace (PTRACE_CONT, child_pid, 0, 0);
|
if (ret != 0)
|
if (ret != 0)
|
warning ("linux_test_for_tracefork: failed to resume child");
|
warning ("linux_test_for_tracefork: failed to resume child");
|
|
|
ret = my_waitpid (child_pid, &status, 0);
|
ret = my_waitpid (child_pid, &status, 0);
|
|
|
if (ret == child_pid && WIFSTOPPED (status)
|
if (ret == child_pid && WIFSTOPPED (status)
|
&& status >> 16 == PTRACE_EVENT_FORK)
|
&& status >> 16 == PTRACE_EVENT_FORK)
|
{
|
{
|
second_pid = 0;
|
second_pid = 0;
|
ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid);
|
ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid);
|
if (ret == 0 && second_pid != 0)
|
if (ret == 0 && second_pid != 0)
|
{
|
{
|
int second_status;
|
int second_status;
|
|
|
linux_supports_tracefork_flag = 1;
|
linux_supports_tracefork_flag = 1;
|
my_waitpid (second_pid, &second_status, 0);
|
my_waitpid (second_pid, &second_status, 0);
|
ret = ptrace (PTRACE_KILL, second_pid, 0, 0);
|
ret = ptrace (PTRACE_KILL, second_pid, 0, 0);
|
if (ret != 0)
|
if (ret != 0)
|
warning ("linux_test_for_tracefork: failed to kill second child");
|
warning ("linux_test_for_tracefork: failed to kill second child");
|
my_waitpid (second_pid, &status, 0);
|
my_waitpid (second_pid, &status, 0);
|
}
|
}
|
}
|
}
|
else
|
else
|
warning ("linux_test_for_tracefork: unexpected result from waitpid "
|
warning ("linux_test_for_tracefork: unexpected result from waitpid "
|
"(%d, status 0x%x)", ret, status);
|
"(%d, status 0x%x)", ret, status);
|
|
|
do
|
do
|
{
|
{
|
ret = ptrace (PTRACE_KILL, child_pid, 0, 0);
|
ret = ptrace (PTRACE_KILL, child_pid, 0, 0);
|
if (ret != 0)
|
if (ret != 0)
|
warning ("linux_test_for_tracefork: failed to kill child");
|
warning ("linux_test_for_tracefork: failed to kill child");
|
my_waitpid (child_pid, &status, 0);
|
my_waitpid (child_pid, &status, 0);
|
}
|
}
|
while (WIFSTOPPED (status));
|
while (WIFSTOPPED (status));
|
|
|
free (stack);
|
free (stack);
|
}
|
}
|
|
|
|
|
static void
|
static void
|
linux_look_up_symbols (void)
|
linux_look_up_symbols (void)
|
{
|
{
|
#ifdef USE_THREAD_DB
|
#ifdef USE_THREAD_DB
|
if (thread_db_active)
|
if (thread_db_active)
|
return;
|
return;
|
|
|
thread_db_active = thread_db_init (!linux_supports_tracefork_flag);
|
thread_db_active = thread_db_init (!linux_supports_tracefork_flag);
|
#endif
|
#endif
|
}
|
}
|
|
|
static void
|
static void
|
linux_request_interrupt (void)
|
linux_request_interrupt (void)
|
{
|
{
|
extern unsigned long signal_pid;
|
extern unsigned long signal_pid;
|
|
|
if (cont_thread != 0 && cont_thread != -1)
|
if (cont_thread != 0 && cont_thread != -1)
|
{
|
{
|
struct process_info *process;
|
struct process_info *process;
|
|
|
process = get_thread_process (current_inferior);
|
process = get_thread_process (current_inferior);
|
kill_lwp (process->lwpid, SIGINT);
|
kill_lwp (process->lwpid, SIGINT);
|
}
|
}
|
else
|
else
|
kill_lwp (signal_pid, SIGINT);
|
kill_lwp (signal_pid, SIGINT);
|
}
|
}
|
|
|
/* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
|
/* Copy LEN bytes from inferior's auxiliary vector starting at OFFSET
|
to debugger memory starting at MYADDR. */
|
to debugger memory starting at MYADDR. */
|
|
|
static int
|
static int
|
linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len)
|
linux_read_auxv (CORE_ADDR offset, unsigned char *myaddr, unsigned int len)
|
{
|
{
|
char filename[PATH_MAX];
|
char filename[PATH_MAX];
|
int fd, n;
|
int fd, n;
|
|
|
snprintf (filename, sizeof filename, "/proc/%ld/auxv", inferior_pid);
|
snprintf (filename, sizeof filename, "/proc/%ld/auxv", inferior_pid);
|
|
|
fd = open (filename, O_RDONLY);
|
fd = open (filename, O_RDONLY);
|
if (fd < 0)
|
if (fd < 0)
|
return -1;
|
return -1;
|
|
|
if (offset != (CORE_ADDR) 0
|
if (offset != (CORE_ADDR) 0
|
&& lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
|
&& lseek (fd, (off_t) offset, SEEK_SET) != (off_t) offset)
|
n = -1;
|
n = -1;
|
else
|
else
|
n = read (fd, myaddr, len);
|
n = read (fd, myaddr, len);
|
|
|
close (fd);
|
close (fd);
|
|
|
return n;
|
return n;
|
}
|
}
|
|
|
/* These watchpoint related wrapper functions simply pass on the function call
|
/* These watchpoint related wrapper functions simply pass on the function call
|
if the target has registered a corresponding function. */
|
if the target has registered a corresponding function. */
|
|
|
static int
|
static int
|
linux_insert_watchpoint (char type, CORE_ADDR addr, int len)
|
linux_insert_watchpoint (char type, CORE_ADDR addr, int len)
|
{
|
{
|
if (the_low_target.insert_watchpoint != NULL)
|
if (the_low_target.insert_watchpoint != NULL)
|
return the_low_target.insert_watchpoint (type, addr, len);
|
return the_low_target.insert_watchpoint (type, addr, len);
|
else
|
else
|
/* Unsupported (see target.h). */
|
/* Unsupported (see target.h). */
|
return 1;
|
return 1;
|
}
|
}
|
|
|
static int
|
static int
|
linux_remove_watchpoint (char type, CORE_ADDR addr, int len)
|
linux_remove_watchpoint (char type, CORE_ADDR addr, int len)
|
{
|
{
|
if (the_low_target.remove_watchpoint != NULL)
|
if (the_low_target.remove_watchpoint != NULL)
|
return the_low_target.remove_watchpoint (type, addr, len);
|
return the_low_target.remove_watchpoint (type, addr, len);
|
else
|
else
|
/* Unsupported (see target.h). */
|
/* Unsupported (see target.h). */
|
return 1;
|
return 1;
|
}
|
}
|
|
|
static int
|
static int
|
linux_stopped_by_watchpoint (void)
|
linux_stopped_by_watchpoint (void)
|
{
|
{
|
if (the_low_target.stopped_by_watchpoint != NULL)
|
if (the_low_target.stopped_by_watchpoint != NULL)
|
return the_low_target.stopped_by_watchpoint ();
|
return the_low_target.stopped_by_watchpoint ();
|
else
|
else
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static CORE_ADDR
|
static CORE_ADDR
|
linux_stopped_data_address (void)
|
linux_stopped_data_address (void)
|
{
|
{
|
if (the_low_target.stopped_data_address != NULL)
|
if (the_low_target.stopped_data_address != NULL)
|
return the_low_target.stopped_data_address ();
|
return the_low_target.stopped_data_address ();
|
else
|
else
|
return 0;
|
return 0;
|
}
|
}
|
|
|
#if defined(__UCLIBC__) && defined(HAS_NOMMU)
|
#if defined(__UCLIBC__) && defined(HAS_NOMMU)
|
#if defined(__mcoldfire__)
|
#if defined(__mcoldfire__)
|
/* These should really be defined in the kernel's ptrace.h header. */
|
/* These should really be defined in the kernel's ptrace.h header. */
|
#define PT_TEXT_ADDR 49*4
|
#define PT_TEXT_ADDR 49*4
|
#define PT_DATA_ADDR 50*4
|
#define PT_DATA_ADDR 50*4
|
#define PT_TEXT_END_ADDR 51*4
|
#define PT_TEXT_END_ADDR 51*4
|
#endif
|
#endif
|
|
|
/* Under uClinux, programs are loaded at non-zero offsets, which we need
|
/* Under uClinux, programs are loaded at non-zero offsets, which we need
|
to tell gdb about. */
|
to tell gdb about. */
|
|
|
static int
|
static int
|
linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p)
|
linux_read_offsets (CORE_ADDR *text_p, CORE_ADDR *data_p)
|
{
|
{
|
#if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR)
|
#if defined(PT_TEXT_ADDR) && defined(PT_DATA_ADDR) && defined(PT_TEXT_END_ADDR)
|
unsigned long text, text_end, data;
|
unsigned long text, text_end, data;
|
int pid = get_thread_process (current_inferior)->head.id;
|
int pid = get_thread_process (current_inferior)->head.id;
|
|
|
errno = 0;
|
errno = 0;
|
|
|
text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0);
|
text = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_ADDR, 0);
|
text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0);
|
text_end = ptrace (PTRACE_PEEKUSER, pid, (long)PT_TEXT_END_ADDR, 0);
|
data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0);
|
data = ptrace (PTRACE_PEEKUSER, pid, (long)PT_DATA_ADDR, 0);
|
|
|
if (errno == 0)
|
if (errno == 0)
|
{
|
{
|
/* Both text and data offsets produced at compile-time (and so
|
/* Both text and data offsets produced at compile-time (and so
|
used by gdb) are relative to the beginning of the program,
|
used by gdb) are relative to the beginning of the program,
|
with the data segment immediately following the text segment.
|
with the data segment immediately following the text segment.
|
However, the actual runtime layout in memory may put the data
|
However, the actual runtime layout in memory may put the data
|
somewhere else, so when we send gdb a data base-address, we
|
somewhere else, so when we send gdb a data base-address, we
|
use the real data base address and subtract the compile-time
|
use the real data base address and subtract the compile-time
|
data base-address from it (which is just the length of the
|
data base-address from it (which is just the length of the
|
text segment). BSS immediately follows data in both
|
text segment). BSS immediately follows data in both
|
cases. */
|
cases. */
|
*text_p = text;
|
*text_p = text;
|
*data_p = data - (text_end - text);
|
*data_p = data - (text_end - text);
|
|
|
return 1;
|
return 1;
|
}
|
}
|
#endif
|
#endif
|
return 0;
|
return 0;
|
}
|
}
|
#endif
|
#endif
|
|
|
static const char *
|
static const char *
|
linux_arch_string (void)
|
linux_arch_string (void)
|
{
|
{
|
return the_low_target.arch_string;
|
return the_low_target.arch_string;
|
}
|
}
|
|
|
static struct target_ops linux_target_ops = {
|
static struct target_ops linux_target_ops = {
|
linux_create_inferior,
|
linux_create_inferior,
|
linux_attach,
|
linux_attach,
|
linux_kill,
|
linux_kill,
|
linux_detach,
|
linux_detach,
|
linux_join,
|
linux_join,
|
linux_thread_alive,
|
linux_thread_alive,
|
linux_resume,
|
linux_resume,
|
linux_wait,
|
linux_wait,
|
linux_fetch_registers,
|
linux_fetch_registers,
|
linux_store_registers,
|
linux_store_registers,
|
linux_read_memory,
|
linux_read_memory,
|
linux_write_memory,
|
linux_write_memory,
|
linux_look_up_symbols,
|
linux_look_up_symbols,
|
linux_request_interrupt,
|
linux_request_interrupt,
|
linux_read_auxv,
|
linux_read_auxv,
|
linux_insert_watchpoint,
|
linux_insert_watchpoint,
|
linux_remove_watchpoint,
|
linux_remove_watchpoint,
|
linux_stopped_by_watchpoint,
|
linux_stopped_by_watchpoint,
|
linux_stopped_data_address,
|
linux_stopped_data_address,
|
#if defined(__UCLIBC__) && defined(HAS_NOMMU)
|
#if defined(__UCLIBC__) && defined(HAS_NOMMU)
|
linux_read_offsets,
|
linux_read_offsets,
|
#else
|
#else
|
NULL,
|
NULL,
|
#endif
|
#endif
|
#ifdef USE_THREAD_DB
|
#ifdef USE_THREAD_DB
|
thread_db_get_tls_address,
|
thread_db_get_tls_address,
|
#else
|
#else
|
NULL,
|
NULL,
|
#endif
|
#endif
|
linux_arch_string,
|
linux_arch_string,
|
NULL,
|
NULL,
|
hostio_last_error_from_errno,
|
hostio_last_error_from_errno,
|
};
|
};
|
|
|
static void
|
static void
|
linux_init_signals ()
|
linux_init_signals ()
|
{
|
{
|
/* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
|
/* FIXME drow/2002-06-09: As above, we should check with LinuxThreads
|
to find what the cancel signal actually is. */
|
to find what the cancel signal actually is. */
|
signal (__SIGRTMIN+1, SIG_IGN);
|
signal (__SIGRTMIN+1, SIG_IGN);
|
}
|
}
|
|
|
void
|
void
|
initialize_low (void)
|
initialize_low (void)
|
{
|
{
|
thread_db_active = 0;
|
thread_db_active = 0;
|
set_target_ops (&linux_target_ops);
|
set_target_ops (&linux_target_ops);
|
set_breakpoint_data (the_low_target.breakpoint,
|
set_breakpoint_data (the_low_target.breakpoint,
|
the_low_target.breakpoint_len);
|
the_low_target.breakpoint_len);
|
init_registers ();
|
init_registers ();
|
linux_init_signals ();
|
linux_init_signals ();
|
linux_test_for_tracefork ();
|
linux_test_for_tracefork ();
|
}
|
}
|
|
|
