/* GNU/Linux native-dependent code common to multiple platforms.
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/* GNU/Linux native-dependent code common to multiple platforms.
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Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
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Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
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Free Software Foundation, Inc.
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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 "defs.h"
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#include "defs.h"
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#include "inferior.h"
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#include "inferior.h"
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#include "target.h"
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#include "target.h"
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#include "gdb_string.h"
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#include "gdb_string.h"
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#include "gdb_wait.h"
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#include "gdb_wait.h"
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#include "gdb_assert.h"
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#include "gdb_assert.h"
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#ifdef HAVE_TKILL_SYSCALL
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#ifdef HAVE_TKILL_SYSCALL
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#include <unistd.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <sys/syscall.h>
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#endif
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#endif
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#include <sys/ptrace.h>
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#include <sys/ptrace.h>
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#include "linux-nat.h"
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#include "linux-nat.h"
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#include "linux-fork.h"
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#include "linux-fork.h"
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#include "gdbthread.h"
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#include "gdbthread.h"
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#include "gdbcmd.h"
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#include "gdbcmd.h"
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#include "regcache.h"
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#include "regcache.h"
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#include "regset.h"
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#include "regset.h"
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#include "inf-ptrace.h"
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#include "inf-ptrace.h"
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#include "auxv.h"
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#include "auxv.h"
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#include <sys/param.h> /* for MAXPATHLEN */
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#include <sys/param.h> /* for MAXPATHLEN */
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#include <sys/procfs.h> /* for elf_gregset etc. */
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#include <sys/procfs.h> /* for elf_gregset etc. */
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#include "elf-bfd.h" /* for elfcore_write_* */
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#include "elf-bfd.h" /* for elfcore_write_* */
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#include "gregset.h" /* for gregset */
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#include "gregset.h" /* for gregset */
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#include "gdbcore.h" /* for get_exec_file */
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#include "gdbcore.h" /* for get_exec_file */
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#include <ctype.h> /* for isdigit */
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#include <ctype.h> /* for isdigit */
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#include "gdbthread.h" /* for struct thread_info etc. */
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#include "gdbthread.h" /* for struct thread_info etc. */
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#include "gdb_stat.h" /* for struct stat */
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#include "gdb_stat.h" /* for struct stat */
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#include <fcntl.h> /* for O_RDONLY */
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#include <fcntl.h> /* for O_RDONLY */
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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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#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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/* 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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here. */
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here. */
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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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#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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#endif
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#endif
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/* The single-threaded native GNU/Linux target_ops. We save a pointer for
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/* The single-threaded native GNU/Linux target_ops. We save a pointer for
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the use of the multi-threaded target. */
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the use of the multi-threaded target. */
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static struct target_ops *linux_ops;
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static struct target_ops *linux_ops;
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static struct target_ops linux_ops_saved;
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static struct target_ops linux_ops_saved;
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/* The method to call, if any, when a new thread is attached. */
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/* The method to call, if any, when a new thread is attached. */
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static void (*linux_nat_new_thread) (ptid_t);
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static void (*linux_nat_new_thread) (ptid_t);
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/* The saved to_xfer_partial method, inherited from inf-ptrace.c.
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/* The saved to_xfer_partial method, inherited from inf-ptrace.c.
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Called by our to_xfer_partial. */
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Called by our to_xfer_partial. */
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static LONGEST (*super_xfer_partial) (struct target_ops *,
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static LONGEST (*super_xfer_partial) (struct target_ops *,
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enum target_object,
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enum target_object,
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const char *, gdb_byte *,
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const char *, gdb_byte *,
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const gdb_byte *,
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const gdb_byte *,
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ULONGEST, LONGEST);
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ULONGEST, LONGEST);
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static int debug_linux_nat;
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static int debug_linux_nat;
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static void
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static void
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show_debug_linux_nat (struct ui_file *file, int from_tty,
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show_debug_linux_nat (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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struct cmd_list_element *c, const char *value)
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{
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{
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fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"),
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fprintf_filtered (file, _("Debugging of GNU/Linux lwp module is %s.\n"),
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value);
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value);
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}
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}
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static int linux_parent_pid;
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static int linux_parent_pid;
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struct simple_pid_list
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struct simple_pid_list
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{
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{
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int pid;
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int pid;
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int status;
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int status;
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struct simple_pid_list *next;
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struct simple_pid_list *next;
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};
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};
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struct simple_pid_list *stopped_pids;
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struct simple_pid_list *stopped_pids;
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/* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK
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/* This variable is a tri-state flag: -1 for unknown, 0 if PTRACE_O_TRACEFORK
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can not be used, 1 if it can. */
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can not be used, 1 if it can. */
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static int linux_supports_tracefork_flag = -1;
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static int linux_supports_tracefork_flag = -1;
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/* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have
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/* If we have PTRACE_O_TRACEFORK, this flag indicates whether we also have
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PTRACE_O_TRACEVFORKDONE. */
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PTRACE_O_TRACEVFORKDONE. */
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static int linux_supports_tracevforkdone_flag = -1;
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static int linux_supports_tracevforkdone_flag = -1;
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/* Trivial list manipulation functions to keep track of a list of
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/* Trivial list manipulation functions to keep track of a list of
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new stopped processes. */
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new stopped processes. */
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static void
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static void
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add_to_pid_list (struct simple_pid_list **listp, int pid, int status)
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add_to_pid_list (struct simple_pid_list **listp, int pid, int status)
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{
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{
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struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list));
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struct simple_pid_list *new_pid = xmalloc (sizeof (struct simple_pid_list));
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new_pid->pid = pid;
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new_pid->pid = pid;
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new_pid->status = status;
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new_pid->status = status;
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new_pid->next = *listp;
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new_pid->next = *listp;
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*listp = new_pid;
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*listp = new_pid;
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}
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}
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static int
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static int
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pull_pid_from_list (struct simple_pid_list **listp, int pid, int *status)
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pull_pid_from_list (struct simple_pid_list **listp, int pid, int *status)
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{
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{
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struct simple_pid_list **p;
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struct simple_pid_list **p;
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for (p = listp; *p != NULL; p = &(*p)->next)
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for (p = listp; *p != NULL; p = &(*p)->next)
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if ((*p)->pid == pid)
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if ((*p)->pid == pid)
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{
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{
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struct simple_pid_list *next = (*p)->next;
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struct simple_pid_list *next = (*p)->next;
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*status = (*p)->status;
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*status = (*p)->status;
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xfree (*p);
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xfree (*p);
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*p = next;
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*p = next;
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return 1;
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return 1;
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}
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}
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return 0;
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return 0;
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}
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}
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static void
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static void
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linux_record_stopped_pid (int pid, int status)
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linux_record_stopped_pid (int pid, int status)
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{
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{
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add_to_pid_list (&stopped_pids, pid, status);
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add_to_pid_list (&stopped_pids, pid, status);
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}
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}
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/* A helper function for linux_test_for_tracefork, called after fork (). */
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/* A helper function for linux_test_for_tracefork, called after fork (). */
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static void
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static void
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linux_tracefork_child (void)
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linux_tracefork_child (void)
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{
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{
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int ret;
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int ret;
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ptrace (PTRACE_TRACEME, 0, 0, 0);
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ptrace (PTRACE_TRACEME, 0, 0, 0);
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kill (getpid (), SIGSTOP);
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kill (getpid (), SIGSTOP);
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fork ();
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fork ();
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_exit (0);
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_exit (0);
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}
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}
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/* Wrapper function for waitpid which handles EINTR. */
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/* Wrapper function for waitpid which handles EINTR. */
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static int
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static int
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my_waitpid (int pid, int *status, int flags)
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my_waitpid (int pid, int *status, int flags)
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{
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{
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int ret;
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int ret;
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do
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do
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{
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{
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ret = waitpid (pid, status, flags);
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ret = waitpid (pid, status, flags);
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}
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}
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while (ret == -1 && errno == EINTR);
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while (ret == -1 && errno == EINTR);
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return ret;
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return ret;
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}
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}
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/* Determine if PTRACE_O_TRACEFORK can be used to follow fork events.
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/* Determine if PTRACE_O_TRACEFORK can be used to follow fork events.
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First, we try to enable fork tracing on ORIGINAL_PID. If this fails,
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First, we try to enable fork tracing on ORIGINAL_PID. If this fails,
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we know that the feature is not available. This may change the tracing
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we know that the feature is not available. This may change the tracing
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options for ORIGINAL_PID, but we'll be setting them shortly anyway.
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options for ORIGINAL_PID, but we'll be setting them shortly anyway.
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However, if it succeeds, we don't know for sure that the feature is
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However, if it succeeds, we don't know for sure that the feature is
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available; old versions of PTRACE_SETOPTIONS ignored unknown options. We
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available; old versions of PTRACE_SETOPTIONS ignored unknown options. We
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create a child process, attach to it, use PTRACE_SETOPTIONS to enable
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create a child process, attach to it, use PTRACE_SETOPTIONS to enable
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fork tracing, and let it fork. If the process exits, we assume that we
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fork tracing, and let it fork. If the process exits, we assume that we
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can't use TRACEFORK; if we get the fork notification, and we can extract
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can't use TRACEFORK; if we get the fork notification, and we can extract
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the new child's PID, then we assume that we can. */
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the new child's PID, then we assume that we can. */
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static void
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static void
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linux_test_for_tracefork (int original_pid)
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linux_test_for_tracefork (int original_pid)
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{
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{
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int child_pid, ret, status;
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int child_pid, ret, status;
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long second_pid;
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long second_pid;
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linux_supports_tracefork_flag = 0;
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linux_supports_tracefork_flag = 0;
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linux_supports_tracevforkdone_flag = 0;
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linux_supports_tracevforkdone_flag = 0;
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ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK);
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ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK);
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if (ret != 0)
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if (ret != 0)
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return;
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return;
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child_pid = fork ();
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child_pid = fork ();
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if (child_pid == -1)
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if (child_pid == -1)
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perror_with_name (("fork"));
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perror_with_name (("fork"));
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if (child_pid == 0)
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if (child_pid == 0)
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linux_tracefork_child ();
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linux_tracefork_child ();
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ret = my_waitpid (child_pid, &status, 0);
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ret = my_waitpid (child_pid, &status, 0);
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if (ret == -1)
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if (ret == -1)
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perror_with_name (("waitpid"));
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perror_with_name (("waitpid"));
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else if (ret != child_pid)
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else if (ret != child_pid)
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error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret);
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error (_("linux_test_for_tracefork: waitpid: unexpected result %d."), ret);
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if (! WIFSTOPPED (status))
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if (! WIFSTOPPED (status))
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error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status);
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error (_("linux_test_for_tracefork: waitpid: unexpected status %d."), status);
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ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK);
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ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK);
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if (ret != 0)
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if (ret != 0)
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{
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{
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ret = ptrace (PTRACE_KILL, child_pid, 0, 0);
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ret = ptrace (PTRACE_KILL, child_pid, 0, 0);
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if (ret != 0)
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if (ret != 0)
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{
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{
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warning (_("linux_test_for_tracefork: failed to kill child"));
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warning (_("linux_test_for_tracefork: failed to kill child"));
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return;
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return;
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}
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}
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ret = my_waitpid (child_pid, &status, 0);
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ret = my_waitpid (child_pid, &status, 0);
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if (ret != child_pid)
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if (ret != child_pid)
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warning (_("linux_test_for_tracefork: failed to wait for killed child"));
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warning (_("linux_test_for_tracefork: failed to wait for killed child"));
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else if (!WIFSIGNALED (status))
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else if (!WIFSIGNALED (status))
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warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from "
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warning (_("linux_test_for_tracefork: unexpected wait status 0x%x from "
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"killed child"), status);
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"killed child"), status);
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return;
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return;
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}
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}
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/* Check whether PTRACE_O_TRACEVFORKDONE is available. */
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/* Check whether PTRACE_O_TRACEVFORKDONE is available. */
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ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0,
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ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0,
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PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE);
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PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE);
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linux_supports_tracevforkdone_flag = (ret == 0);
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linux_supports_tracevforkdone_flag = (ret == 0);
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ret = ptrace (PTRACE_CONT, child_pid, 0, 0);
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ret = ptrace (PTRACE_CONT, child_pid, 0, 0);
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if (ret != 0)
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if (ret != 0)
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warning (_("linux_test_for_tracefork: failed to resume child"));
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warning (_("linux_test_for_tracefork: failed to resume child"));
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|
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ret = my_waitpid (child_pid, &status, 0);
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ret = my_waitpid (child_pid, &status, 0);
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|
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if (ret == child_pid && WIFSTOPPED (status)
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if (ret == child_pid && WIFSTOPPED (status)
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&& status >> 16 == PTRACE_EVENT_FORK)
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&& status >> 16 == PTRACE_EVENT_FORK)
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{
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{
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second_pid = 0;
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second_pid = 0;
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ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid);
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ret = ptrace (PTRACE_GETEVENTMSG, child_pid, 0, &second_pid);
|
if (ret == 0 && second_pid != 0)
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if (ret == 0 && second_pid != 0)
|
{
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{
|
int second_status;
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int second_status;
|
|
|
linux_supports_tracefork_flag = 1;
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linux_supports_tracefork_flag = 1;
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my_waitpid (second_pid, &second_status, 0);
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my_waitpid (second_pid, &second_status, 0);
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ret = ptrace (PTRACE_KILL, second_pid, 0, 0);
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ret = ptrace (PTRACE_KILL, second_pid, 0, 0);
|
if (ret != 0)
|
if (ret != 0)
|
warning (_("linux_test_for_tracefork: failed to kill second child"));
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warning (_("linux_test_for_tracefork: failed to kill second child"));
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my_waitpid (second_pid, &status, 0);
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my_waitpid (second_pid, &status, 0);
|
}
|
}
|
}
|
}
|
else
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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);
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"(%d, status 0x%x)"), ret, status);
|
|
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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);
|
}
|
}
|
|
|
/* Return non-zero iff we have tracefork functionality available.
|
/* Return non-zero iff we have tracefork functionality available.
|
This function also sets linux_supports_tracefork_flag. */
|
This function also sets linux_supports_tracefork_flag. */
|
|
|
static int
|
static int
|
linux_supports_tracefork (int pid)
|
linux_supports_tracefork (int pid)
|
{
|
{
|
if (linux_supports_tracefork_flag == -1)
|
if (linux_supports_tracefork_flag == -1)
|
linux_test_for_tracefork (pid);
|
linux_test_for_tracefork (pid);
|
return linux_supports_tracefork_flag;
|
return linux_supports_tracefork_flag;
|
}
|
}
|
|
|
static int
|
static int
|
linux_supports_tracevforkdone (int pid)
|
linux_supports_tracevforkdone (int pid)
|
{
|
{
|
if (linux_supports_tracefork_flag == -1)
|
if (linux_supports_tracefork_flag == -1)
|
linux_test_for_tracefork (pid);
|
linux_test_for_tracefork (pid);
|
return linux_supports_tracevforkdone_flag;
|
return linux_supports_tracevforkdone_flag;
|
}
|
}
|
|
|
|
|
void
|
void
|
linux_enable_event_reporting (ptid_t ptid)
|
linux_enable_event_reporting (ptid_t ptid)
|
{
|
{
|
int pid = ptid_get_lwp (ptid);
|
int pid = ptid_get_lwp (ptid);
|
int options;
|
int options;
|
|
|
if (pid == 0)
|
if (pid == 0)
|
pid = ptid_get_pid (ptid);
|
pid = ptid_get_pid (ptid);
|
|
|
if (! linux_supports_tracefork (pid))
|
if (! linux_supports_tracefork (pid))
|
return;
|
return;
|
|
|
options = PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACEEXEC
|
options = PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACEEXEC
|
| PTRACE_O_TRACECLONE;
|
| PTRACE_O_TRACECLONE;
|
if (linux_supports_tracevforkdone (pid))
|
if (linux_supports_tracevforkdone (pid))
|
options |= PTRACE_O_TRACEVFORKDONE;
|
options |= PTRACE_O_TRACEVFORKDONE;
|
|
|
/* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support
|
/* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support
|
read-only process state. */
|
read-only process state. */
|
|
|
ptrace (PTRACE_SETOPTIONS, pid, 0, options);
|
ptrace (PTRACE_SETOPTIONS, pid, 0, options);
|
}
|
}
|
|
|
static void
|
static void
|
linux_child_post_attach (int pid)
|
linux_child_post_attach (int pid)
|
{
|
{
|
linux_enable_event_reporting (pid_to_ptid (pid));
|
linux_enable_event_reporting (pid_to_ptid (pid));
|
check_for_thread_db ();
|
check_for_thread_db ();
|
}
|
}
|
|
|
static void
|
static void
|
linux_child_post_startup_inferior (ptid_t ptid)
|
linux_child_post_startup_inferior (ptid_t ptid)
|
{
|
{
|
linux_enable_event_reporting (ptid);
|
linux_enable_event_reporting (ptid);
|
check_for_thread_db ();
|
check_for_thread_db ();
|
}
|
}
|
|
|
static int
|
static int
|
linux_child_follow_fork (struct target_ops *ops, int follow_child)
|
linux_child_follow_fork (struct target_ops *ops, int follow_child)
|
{
|
{
|
ptid_t last_ptid;
|
ptid_t last_ptid;
|
struct target_waitstatus last_status;
|
struct target_waitstatus last_status;
|
int has_vforked;
|
int has_vforked;
|
int parent_pid, child_pid;
|
int parent_pid, child_pid;
|
|
|
get_last_target_status (&last_ptid, &last_status);
|
get_last_target_status (&last_ptid, &last_status);
|
has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED);
|
has_vforked = (last_status.kind == TARGET_WAITKIND_VFORKED);
|
parent_pid = ptid_get_lwp (last_ptid);
|
parent_pid = ptid_get_lwp (last_ptid);
|
if (parent_pid == 0)
|
if (parent_pid == 0)
|
parent_pid = ptid_get_pid (last_ptid);
|
parent_pid = ptid_get_pid (last_ptid);
|
child_pid = last_status.value.related_pid;
|
child_pid = last_status.value.related_pid;
|
|
|
if (! follow_child)
|
if (! follow_child)
|
{
|
{
|
/* We're already attached to the parent, by default. */
|
/* We're already attached to the parent, by default. */
|
|
|
/* Before detaching from the child, remove all breakpoints from
|
/* Before detaching from the child, remove all breakpoints from
|
it. (This won't actually modify the breakpoint list, but will
|
it. (This won't actually modify the breakpoint list, but will
|
physically remove the breakpoints from the child.) */
|
physically remove the breakpoints from the child.) */
|
/* If we vforked this will remove the breakpoints from the parent
|
/* If we vforked this will remove the breakpoints from the parent
|
also, but they'll be reinserted below. */
|
also, but they'll be reinserted below. */
|
detach_breakpoints (child_pid);
|
detach_breakpoints (child_pid);
|
|
|
/* Detach new forked process? */
|
/* Detach new forked process? */
|
if (detach_fork)
|
if (detach_fork)
|
{
|
{
|
if (info_verbose || debug_linux_nat)
|
if (info_verbose || debug_linux_nat)
|
{
|
{
|
target_terminal_ours ();
|
target_terminal_ours ();
|
fprintf_filtered (gdb_stdlog,
|
fprintf_filtered (gdb_stdlog,
|
"Detaching after fork from child process %d.\n",
|
"Detaching after fork from child process %d.\n",
|
child_pid);
|
child_pid);
|
}
|
}
|
|
|
ptrace (PTRACE_DETACH, child_pid, 0, 0);
|
ptrace (PTRACE_DETACH, child_pid, 0, 0);
|
}
|
}
|
else
|
else
|
{
|
{
|
struct fork_info *fp;
|
struct fork_info *fp;
|
/* Retain child fork in ptrace (stopped) state. */
|
/* Retain child fork in ptrace (stopped) state. */
|
fp = find_fork_pid (child_pid);
|
fp = find_fork_pid (child_pid);
|
if (!fp)
|
if (!fp)
|
fp = add_fork (child_pid);
|
fp = add_fork (child_pid);
|
fork_save_infrun_state (fp, 0);
|
fork_save_infrun_state (fp, 0);
|
}
|
}
|
|
|
if (has_vforked)
|
if (has_vforked)
|
{
|
{
|
gdb_assert (linux_supports_tracefork_flag >= 0);
|
gdb_assert (linux_supports_tracefork_flag >= 0);
|
if (linux_supports_tracevforkdone (0))
|
if (linux_supports_tracevforkdone (0))
|
{
|
{
|
int status;
|
int status;
|
|
|
ptrace (PTRACE_CONT, parent_pid, 0, 0);
|
ptrace (PTRACE_CONT, parent_pid, 0, 0);
|
my_waitpid (parent_pid, &status, __WALL);
|
my_waitpid (parent_pid, &status, __WALL);
|
if ((status >> 16) != PTRACE_EVENT_VFORK_DONE)
|
if ((status >> 16) != PTRACE_EVENT_VFORK_DONE)
|
warning (_("Unexpected waitpid result %06x when waiting for "
|
warning (_("Unexpected waitpid result %06x when waiting for "
|
"vfork-done"), status);
|
"vfork-done"), status);
|
}
|
}
|
else
|
else
|
{
|
{
|
/* We can't insert breakpoints until the child has
|
/* We can't insert breakpoints until the child has
|
finished with the shared memory region. We need to
|
finished with the shared memory region. We need to
|
wait until that happens. Ideal would be to just
|
wait until that happens. Ideal would be to just
|
call:
|
call:
|
- ptrace (PTRACE_SYSCALL, parent_pid, 0, 0);
|
- ptrace (PTRACE_SYSCALL, parent_pid, 0, 0);
|
- waitpid (parent_pid, &status, __WALL);
|
- waitpid (parent_pid, &status, __WALL);
|
However, most architectures can't handle a syscall
|
However, most architectures can't handle a syscall
|
being traced on the way out if it wasn't traced on
|
being traced on the way out if it wasn't traced on
|
the way in.
|
the way in.
|
|
|
We might also think to loop, continuing the child
|
We might also think to loop, continuing the child
|
until it exits or gets a SIGTRAP. One problem is
|
until it exits or gets a SIGTRAP. One problem is
|
that the child might call ptrace with PTRACE_TRACEME.
|
that the child might call ptrace with PTRACE_TRACEME.
|
|
|
There's no simple and reliable way to figure out when
|
There's no simple and reliable way to figure out when
|
the vforked child will be done with its copy of the
|
the vforked child will be done with its copy of the
|
shared memory. We could step it out of the syscall,
|
shared memory. We could step it out of the syscall,
|
two instructions, let it go, and then single-step the
|
two instructions, let it go, and then single-step the
|
parent once. When we have hardware single-step, this
|
parent once. When we have hardware single-step, this
|
would work; with software single-step it could still
|
would work; with software single-step it could still
|
be made to work but we'd have to be able to insert
|
be made to work but we'd have to be able to insert
|
single-step breakpoints in the child, and we'd have
|
single-step breakpoints in the child, and we'd have
|
to insert -just- the single-step breakpoint in the
|
to insert -just- the single-step breakpoint in the
|
parent. Very awkward.
|
parent. Very awkward.
|
|
|
In the end, the best we can do is to make sure it
|
In the end, the best we can do is to make sure it
|
runs for a little while. Hopefully it will be out of
|
runs for a little while. Hopefully it will be out of
|
range of any breakpoints we reinsert. Usually this
|
range of any breakpoints we reinsert. Usually this
|
is only the single-step breakpoint at vfork's return
|
is only the single-step breakpoint at vfork's return
|
point. */
|
point. */
|
|
|
usleep (10000);
|
usleep (10000);
|
}
|
}
|
|
|
/* Since we vforked, breakpoints were removed in the parent
|
/* Since we vforked, breakpoints were removed in the parent
|
too. Put them back. */
|
too. Put them back. */
|
reattach_breakpoints (parent_pid);
|
reattach_breakpoints (parent_pid);
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
char child_pid_spelling[40];
|
char child_pid_spelling[40];
|
|
|
/* Needed to keep the breakpoint lists in sync. */
|
/* Needed to keep the breakpoint lists in sync. */
|
if (! has_vforked)
|
if (! has_vforked)
|
detach_breakpoints (child_pid);
|
detach_breakpoints (child_pid);
|
|
|
/* Before detaching from the parent, remove all breakpoints from it. */
|
/* Before detaching from the parent, remove all breakpoints from it. */
|
remove_breakpoints ();
|
remove_breakpoints ();
|
|
|
if (info_verbose || debug_linux_nat)
|
if (info_verbose || debug_linux_nat)
|
{
|
{
|
target_terminal_ours ();
|
target_terminal_ours ();
|
fprintf_filtered (gdb_stdlog,
|
fprintf_filtered (gdb_stdlog,
|
"Attaching after fork to child process %d.\n",
|
"Attaching after fork to child process %d.\n",
|
child_pid);
|
child_pid);
|
}
|
}
|
|
|
/* If we're vforking, we may want to hold on to the parent until
|
/* If we're vforking, we may want to hold on to the parent until
|
the child exits or execs. At exec time we can remove the old
|
the child exits or execs. At exec time we can remove the old
|
breakpoints from the parent and detach it; at exit time we
|
breakpoints from the parent and detach it; at exit time we
|
could do the same (or even, sneakily, resume debugging it - the
|
could do the same (or even, sneakily, resume debugging it - the
|
child's exec has failed, or something similar).
|
child's exec has failed, or something similar).
|
|
|
This doesn't clean up "properly", because we can't call
|
This doesn't clean up "properly", because we can't call
|
target_detach, but that's OK; if the current target is "child",
|
target_detach, but that's OK; if the current target is "child",
|
then it doesn't need any further cleanups, and lin_lwp will
|
then it doesn't need any further cleanups, and lin_lwp will
|
generally not encounter vfork (vfork is defined to fork
|
generally not encounter vfork (vfork is defined to fork
|
in libpthread.so).
|
in libpthread.so).
|
|
|
The holding part is very easy if we have VFORKDONE events;
|
The holding part is very easy if we have VFORKDONE events;
|
but keeping track of both processes is beyond GDB at the
|
but keeping track of both processes is beyond GDB at the
|
moment. So we don't expose the parent to the rest of GDB.
|
moment. So we don't expose the parent to the rest of GDB.
|
Instead we quietly hold onto it until such time as we can
|
Instead we quietly hold onto it until such time as we can
|
safely resume it. */
|
safely resume it. */
|
|
|
if (has_vforked)
|
if (has_vforked)
|
linux_parent_pid = parent_pid;
|
linux_parent_pid = parent_pid;
|
else if (!detach_fork)
|
else if (!detach_fork)
|
{
|
{
|
struct fork_info *fp;
|
struct fork_info *fp;
|
/* Retain parent fork in ptrace (stopped) state. */
|
/* Retain parent fork in ptrace (stopped) state. */
|
fp = find_fork_pid (parent_pid);
|
fp = find_fork_pid (parent_pid);
|
if (!fp)
|
if (!fp)
|
fp = add_fork (parent_pid);
|
fp = add_fork (parent_pid);
|
fork_save_infrun_state (fp, 0);
|
fork_save_infrun_state (fp, 0);
|
}
|
}
|
else
|
else
|
{
|
{
|
target_detach (NULL, 0);
|
target_detach (NULL, 0);
|
}
|
}
|
|
|
inferior_ptid = ptid_build (child_pid, child_pid, 0);
|
inferior_ptid = ptid_build (child_pid, child_pid, 0);
|
|
|
/* Reinstall ourselves, since we might have been removed in
|
/* Reinstall ourselves, since we might have been removed in
|
target_detach (which does other necessary cleanup). */
|
target_detach (which does other necessary cleanup). */
|
|
|
push_target (ops);
|
push_target (ops);
|
linux_nat_switch_fork (inferior_ptid);
|
linux_nat_switch_fork (inferior_ptid);
|
check_for_thread_db ();
|
check_for_thread_db ();
|
|
|
/* Reset breakpoints in the child as appropriate. */
|
/* Reset breakpoints in the child as appropriate. */
|
follow_inferior_reset_breakpoints ();
|
follow_inferior_reset_breakpoints ();
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
|
|
static void
|
static void
|
linux_child_insert_fork_catchpoint (int pid)
|
linux_child_insert_fork_catchpoint (int pid)
|
{
|
{
|
if (! linux_supports_tracefork (pid))
|
if (! linux_supports_tracefork (pid))
|
error (_("Your system does not support fork catchpoints."));
|
error (_("Your system does not support fork catchpoints."));
|
}
|
}
|
|
|
static void
|
static void
|
linux_child_insert_vfork_catchpoint (int pid)
|
linux_child_insert_vfork_catchpoint (int pid)
|
{
|
{
|
if (!linux_supports_tracefork (pid))
|
if (!linux_supports_tracefork (pid))
|
error (_("Your system does not support vfork catchpoints."));
|
error (_("Your system does not support vfork catchpoints."));
|
}
|
}
|
|
|
static void
|
static void
|
linux_child_insert_exec_catchpoint (int pid)
|
linux_child_insert_exec_catchpoint (int pid)
|
{
|
{
|
if (!linux_supports_tracefork (pid))
|
if (!linux_supports_tracefork (pid))
|
error (_("Your system does not support exec catchpoints."));
|
error (_("Your system does not support exec catchpoints."));
|
}
|
}
|
|
|
/* On GNU/Linux there are no real LWP's. The closest thing to LWP's
|
/* On GNU/Linux there are no real LWP's. The closest thing to LWP's
|
are processes sharing the same VM space. A multi-threaded process
|
are processes sharing the same VM space. A multi-threaded process
|
is basically a group of such processes. However, such a grouping
|
is basically a group of such processes. However, such a grouping
|
is almost entirely a user-space issue; the kernel doesn't enforce
|
is almost entirely a user-space issue; the kernel doesn't enforce
|
such a grouping at all (this might change in the future). In
|
such a grouping at all (this might change in the future). In
|
general, we'll rely on the threads library (i.e. the GNU/Linux
|
general, we'll rely on the threads library (i.e. the GNU/Linux
|
Threads library) to provide such a grouping.
|
Threads library) to provide such a grouping.
|
|
|
It is perfectly well possible to write a multi-threaded application
|
It is perfectly well possible to write a multi-threaded application
|
without the assistance of a threads library, by using the clone
|
without the assistance of a threads library, by using the clone
|
system call directly. This module should be able to give some
|
system call directly. This module should be able to give some
|
rudimentary support for debugging such applications if developers
|
rudimentary support for debugging such applications if developers
|
specify the CLONE_PTRACE flag in the clone system call, and are
|
specify the CLONE_PTRACE flag in the clone system call, and are
|
using the Linux kernel 2.4 or above.
|
using the Linux kernel 2.4 or above.
|
|
|
Note that there are some peculiarities in GNU/Linux that affect
|
Note that there are some peculiarities in GNU/Linux that affect
|
this code:
|
this code:
|
|
|
- In general one should specify the __WCLONE flag to waitpid in
|
- In general one should specify the __WCLONE flag to waitpid in
|
order to make it report events for any of the cloned processes
|
order to make it report events for any of the cloned processes
|
(and leave it out for the initial process). However, if a cloned
|
(and leave it out for the initial process). However, if a cloned
|
process has exited the exit status is only reported if the
|
process has exited the exit status is only reported if the
|
__WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but
|
__WCLONE flag is absent. Linux kernel 2.4 has a __WALL flag, but
|
we cannot use it since GDB must work on older systems too.
|
we cannot use it since GDB must work on older systems too.
|
|
|
- When a traced, cloned process exits and is waited for by the
|
- When a traced, cloned process exits and is waited for by the
|
debugger, the kernel reassigns it to the original parent and
|
debugger, the kernel reassigns it to the original parent and
|
keeps it around as a "zombie". Somehow, the GNU/Linux Threads
|
keeps it around as a "zombie". Somehow, the GNU/Linux Threads
|
library doesn't notice this, which leads to the "zombie problem":
|
library doesn't notice this, which leads to the "zombie problem":
|
When debugged a multi-threaded process that spawns a lot of
|
When debugged a multi-threaded process that spawns a lot of
|
threads will run out of processes, even if the threads exit,
|
threads will run out of processes, even if the threads exit,
|
because the "zombies" stay around. */
|
because the "zombies" stay around. */
|
|
|
/* List of known LWPs. */
|
/* List of known LWPs. */
|
struct lwp_info *lwp_list;
|
struct lwp_info *lwp_list;
|
|
|
/* Number of LWPs in the list. */
|
/* Number of LWPs in the list. */
|
static int num_lwps;
|
static int num_lwps;
|
|
|
|
|
#define GET_LWP(ptid) ptid_get_lwp (ptid)
|
#define GET_LWP(ptid) ptid_get_lwp (ptid)
|
#define GET_PID(ptid) ptid_get_pid (ptid)
|
#define GET_PID(ptid) ptid_get_pid (ptid)
|
#define is_lwp(ptid) (GET_LWP (ptid) != 0)
|
#define is_lwp(ptid) (GET_LWP (ptid) != 0)
|
#define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
|
#define BUILD_LWP(lwp, pid) ptid_build (pid, lwp, 0)
|
|
|
/* If the last reported event was a SIGTRAP, this variable is set to
|
/* If the last reported event was a SIGTRAP, this variable is set to
|
the process id of the LWP/thread that got it. */
|
the process id of the LWP/thread that got it. */
|
ptid_t trap_ptid;
|
ptid_t trap_ptid;
|
|
|
|
|
/* Since we cannot wait (in linux_nat_wait) for the initial process and
|
/* Since we cannot wait (in linux_nat_wait) for the initial process and
|
any cloned processes with a single call to waitpid, we have to use
|
any cloned processes with a single call to waitpid, we have to use
|
the WNOHANG flag and call waitpid in a loop. To optimize
|
the WNOHANG flag and call waitpid in a loop. To optimize
|
things a bit we use `sigsuspend' to wake us up when a process has
|
things a bit we use `sigsuspend' to wake us up when a process has
|
something to report (it will send us a SIGCHLD if it has). To make
|
something to report (it will send us a SIGCHLD if it has). To make
|
this work we have to juggle with the signal mask. We save the
|
this work we have to juggle with the signal mask. We save the
|
original signal mask such that we can restore it before creating a
|
original signal mask such that we can restore it before creating a
|
new process in order to avoid blocking certain signals in the
|
new process in order to avoid blocking certain signals in the
|
inferior. We then block SIGCHLD during the waitpid/sigsuspend
|
inferior. We then block SIGCHLD during the waitpid/sigsuspend
|
loop. */
|
loop. */
|
|
|
/* Original signal mask. */
|
/* Original signal mask. */
|
static sigset_t normal_mask;
|
static sigset_t normal_mask;
|
|
|
/* Signal mask for use with sigsuspend in linux_nat_wait, initialized in
|
/* Signal mask for use with sigsuspend in linux_nat_wait, initialized in
|
_initialize_linux_nat. */
|
_initialize_linux_nat. */
|
static sigset_t suspend_mask;
|
static sigset_t suspend_mask;
|
|
|
/* Signals to block to make that sigsuspend work. */
|
/* Signals to block to make that sigsuspend work. */
|
static sigset_t blocked_mask;
|
static sigset_t blocked_mask;
|
|
|
|
|
/* Prototypes for local functions. */
|
/* Prototypes for local functions. */
|
static int stop_wait_callback (struct lwp_info *lp, void *data);
|
static int stop_wait_callback (struct lwp_info *lp, void *data);
|
static int linux_nat_thread_alive (ptid_t ptid);
|
static int linux_nat_thread_alive (ptid_t ptid);
|
static char *linux_child_pid_to_exec_file (int pid);
|
static char *linux_child_pid_to_exec_file (int pid);
|
|
|
/* Convert wait status STATUS to a string. Used for printing debug
|
/* Convert wait status STATUS to a string. Used for printing debug
|
messages only. */
|
messages only. */
|
|
|
static char *
|
static char *
|
status_to_str (int status)
|
status_to_str (int status)
|
{
|
{
|
static char buf[64];
|
static char buf[64];
|
|
|
if (WIFSTOPPED (status))
|
if (WIFSTOPPED (status))
|
snprintf (buf, sizeof (buf), "%s (stopped)",
|
snprintf (buf, sizeof (buf), "%s (stopped)",
|
strsignal (WSTOPSIG (status)));
|
strsignal (WSTOPSIG (status)));
|
else if (WIFSIGNALED (status))
|
else if (WIFSIGNALED (status))
|
snprintf (buf, sizeof (buf), "%s (terminated)",
|
snprintf (buf, sizeof (buf), "%s (terminated)",
|
strsignal (WSTOPSIG (status)));
|
strsignal (WSTOPSIG (status)));
|
else
|
else
|
snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status));
|
snprintf (buf, sizeof (buf), "%d (exited)", WEXITSTATUS (status));
|
|
|
return buf;
|
return buf;
|
}
|
}
|
|
|
/* Initialize the list of LWPs. Note that this module, contrary to
|
/* Initialize the list of LWPs. Note that this module, contrary to
|
what GDB's generic threads layer does for its thread list,
|
what GDB's generic threads layer does for its thread list,
|
re-initializes the LWP lists whenever we mourn or detach (which
|
re-initializes the LWP lists whenever we mourn or detach (which
|
doesn't involve mourning) the inferior. */
|
doesn't involve mourning) the inferior. */
|
|
|
static void
|
static void
|
init_lwp_list (void)
|
init_lwp_list (void)
|
{
|
{
|
struct lwp_info *lp, *lpnext;
|
struct lwp_info *lp, *lpnext;
|
|
|
for (lp = lwp_list; lp; lp = lpnext)
|
for (lp = lwp_list; lp; lp = lpnext)
|
{
|
{
|
lpnext = lp->next;
|
lpnext = lp->next;
|
xfree (lp);
|
xfree (lp);
|
}
|
}
|
|
|
lwp_list = NULL;
|
lwp_list = NULL;
|
num_lwps = 0;
|
num_lwps = 0;
|
}
|
}
|
|
|
/* Add the LWP specified by PID to the list. Return a pointer to the
|
/* Add the LWP specified by PID to the list. Return a pointer to the
|
structure describing the new LWP. The LWP should already be stopped
|
structure describing the new LWP. The LWP should already be stopped
|
(with an exception for the very first LWP). */
|
(with an exception for the very first LWP). */
|
|
|
static struct lwp_info *
|
static struct lwp_info *
|
add_lwp (ptid_t ptid)
|
add_lwp (ptid_t ptid)
|
{
|
{
|
struct lwp_info *lp;
|
struct lwp_info *lp;
|
|
|
gdb_assert (is_lwp (ptid));
|
gdb_assert (is_lwp (ptid));
|
|
|
lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info));
|
lp = (struct lwp_info *) xmalloc (sizeof (struct lwp_info));
|
|
|
memset (lp, 0, sizeof (struct lwp_info));
|
memset (lp, 0, sizeof (struct lwp_info));
|
|
|
lp->waitstatus.kind = TARGET_WAITKIND_IGNORE;
|
lp->waitstatus.kind = TARGET_WAITKIND_IGNORE;
|
|
|
lp->ptid = ptid;
|
lp->ptid = ptid;
|
|
|
lp->next = lwp_list;
|
lp->next = lwp_list;
|
lwp_list = lp;
|
lwp_list = lp;
|
++num_lwps;
|
++num_lwps;
|
|
|
if (num_lwps > 1 && linux_nat_new_thread != NULL)
|
if (num_lwps > 1 && linux_nat_new_thread != NULL)
|
linux_nat_new_thread (ptid);
|
linux_nat_new_thread (ptid);
|
|
|
return lp;
|
return lp;
|
}
|
}
|
|
|
/* Remove the LWP specified by PID from the list. */
|
/* Remove the LWP specified by PID from the list. */
|
|
|
static void
|
static void
|
delete_lwp (ptid_t ptid)
|
delete_lwp (ptid_t ptid)
|
{
|
{
|
struct lwp_info *lp, *lpprev;
|
struct lwp_info *lp, *lpprev;
|
|
|
lpprev = NULL;
|
lpprev = NULL;
|
|
|
for (lp = lwp_list; lp; lpprev = lp, lp = lp->next)
|
for (lp = lwp_list; lp; lpprev = lp, lp = lp->next)
|
if (ptid_equal (lp->ptid, ptid))
|
if (ptid_equal (lp->ptid, ptid))
|
break;
|
break;
|
|
|
if (!lp)
|
if (!lp)
|
return;
|
return;
|
|
|
num_lwps--;
|
num_lwps--;
|
|
|
if (lpprev)
|
if (lpprev)
|
lpprev->next = lp->next;
|
lpprev->next = lp->next;
|
else
|
else
|
lwp_list = lp->next;
|
lwp_list = lp->next;
|
|
|
xfree (lp);
|
xfree (lp);
|
}
|
}
|
|
|
/* Return a pointer to the structure describing the LWP corresponding
|
/* Return a pointer to the structure describing the LWP corresponding
|
to PID. If no corresponding LWP could be found, return NULL. */
|
to PID. If no corresponding LWP could be found, return NULL. */
|
|
|
static struct lwp_info *
|
static struct lwp_info *
|
find_lwp_pid (ptid_t ptid)
|
find_lwp_pid (ptid_t ptid)
|
{
|
{
|
struct lwp_info *lp;
|
struct lwp_info *lp;
|
int lwp;
|
int lwp;
|
|
|
if (is_lwp (ptid))
|
if (is_lwp (ptid))
|
lwp = GET_LWP (ptid);
|
lwp = GET_LWP (ptid);
|
else
|
else
|
lwp = GET_PID (ptid);
|
lwp = GET_PID (ptid);
|
|
|
for (lp = lwp_list; lp; lp = lp->next)
|
for (lp = lwp_list; lp; lp = lp->next)
|
if (lwp == GET_LWP (lp->ptid))
|
if (lwp == GET_LWP (lp->ptid))
|
return lp;
|
return lp;
|
|
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/* Call CALLBACK with its second argument set to DATA for every LWP in
|
/* Call CALLBACK with its second argument set to DATA for every LWP in
|
the list. If CALLBACK returns 1 for a particular LWP, return a
|
the list. If CALLBACK returns 1 for a particular LWP, return a
|
pointer to the structure describing that LWP immediately.
|
pointer to the structure describing that LWP immediately.
|
Otherwise return NULL. */
|
Otherwise return NULL. */
|
|
|
struct lwp_info *
|
struct lwp_info *
|
iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data)
|
iterate_over_lwps (int (*callback) (struct lwp_info *, void *), void *data)
|
{
|
{
|
struct lwp_info *lp, *lpnext;
|
struct lwp_info *lp, *lpnext;
|
|
|
for (lp = lwp_list; lp; lp = lpnext)
|
for (lp = lwp_list; lp; lp = lpnext)
|
{
|
{
|
lpnext = lp->next;
|
lpnext = lp->next;
|
if ((*callback) (lp, data))
|
if ((*callback) (lp, data))
|
return lp;
|
return lp;
|
}
|
}
|
|
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/* Update our internal state when changing from one fork (checkpoint,
|
/* Update our internal state when changing from one fork (checkpoint,
|
et cetera) to another indicated by NEW_PTID. We can only switch
|
et cetera) to another indicated by NEW_PTID. We can only switch
|
single-threaded applications, so we only create one new LWP, and
|
single-threaded applications, so we only create one new LWP, and
|
the previous list is discarded. */
|
the previous list is discarded. */
|
|
|
void
|
void
|
linux_nat_switch_fork (ptid_t new_ptid)
|
linux_nat_switch_fork (ptid_t new_ptid)
|
{
|
{
|
struct lwp_info *lp;
|
struct lwp_info *lp;
|
|
|
init_lwp_list ();
|
init_lwp_list ();
|
lp = add_lwp (new_ptid);
|
lp = add_lwp (new_ptid);
|
lp->stopped = 1;
|
lp->stopped = 1;
|
}
|
}
|
|
|
/* Record a PTID for later deletion. */
|
/* Record a PTID for later deletion. */
|
|
|
struct saved_ptids
|
struct saved_ptids
|
{
|
{
|
ptid_t ptid;
|
ptid_t ptid;
|
struct saved_ptids *next;
|
struct saved_ptids *next;
|
};
|
};
|
static struct saved_ptids *threads_to_delete;
|
static struct saved_ptids *threads_to_delete;
|
|
|
static void
|
static void
|
record_dead_thread (ptid_t ptid)
|
record_dead_thread (ptid_t ptid)
|
{
|
{
|
struct saved_ptids *p = xmalloc (sizeof (struct saved_ptids));
|
struct saved_ptids *p = xmalloc (sizeof (struct saved_ptids));
|
p->ptid = ptid;
|
p->ptid = ptid;
|
p->next = threads_to_delete;
|
p->next = threads_to_delete;
|
threads_to_delete = p;
|
threads_to_delete = p;
|
}
|
}
|
|
|
/* Delete any dead threads which are not the current thread. */
|
/* Delete any dead threads which are not the current thread. */
|
|
|
static void
|
static void
|
prune_lwps (void)
|
prune_lwps (void)
|
{
|
{
|
struct saved_ptids **p = &threads_to_delete;
|
struct saved_ptids **p = &threads_to_delete;
|
|
|
while (*p)
|
while (*p)
|
if (! ptid_equal ((*p)->ptid, inferior_ptid))
|
if (! ptid_equal ((*p)->ptid, inferior_ptid))
|
{
|
{
|
struct saved_ptids *tmp = *p;
|
struct saved_ptids *tmp = *p;
|
delete_thread (tmp->ptid);
|
delete_thread (tmp->ptid);
|
*p = tmp->next;
|
*p = tmp->next;
|
xfree (tmp);
|
xfree (tmp);
|
}
|
}
|
else
|
else
|
p = &(*p)->next;
|
p = &(*p)->next;
|
}
|
}
|
|
|
/* Callback for iterate_over_threads that finds a thread corresponding
|
/* Callback for iterate_over_threads that finds a thread corresponding
|
to the given LWP. */
|
to the given LWP. */
|
|
|
static int
|
static int
|
find_thread_from_lwp (struct thread_info *thr, void *dummy)
|
find_thread_from_lwp (struct thread_info *thr, void *dummy)
|
{
|
{
|
ptid_t *ptid_p = dummy;
|
ptid_t *ptid_p = dummy;
|
|
|
if (GET_LWP (thr->ptid) && GET_LWP (thr->ptid) == GET_LWP (*ptid_p))
|
if (GET_LWP (thr->ptid) && GET_LWP (thr->ptid) == GET_LWP (*ptid_p))
|
return 1;
|
return 1;
|
else
|
else
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Handle the exit of a single thread LP. */
|
/* Handle the exit of a single thread LP. */
|
|
|
static void
|
static void
|
exit_lwp (struct lwp_info *lp)
|
exit_lwp (struct lwp_info *lp)
|
{
|
{
|
if (in_thread_list (lp->ptid))
|
if (in_thread_list (lp->ptid))
|
{
|
{
|
/* Core GDB cannot deal with us deleting the current thread. */
|
/* Core GDB cannot deal with us deleting the current thread. */
|
if (!ptid_equal (lp->ptid, inferior_ptid))
|
if (!ptid_equal (lp->ptid, inferior_ptid))
|
delete_thread (lp->ptid);
|
delete_thread (lp->ptid);
|
else
|
else
|
record_dead_thread (lp->ptid);
|
record_dead_thread (lp->ptid);
|
printf_unfiltered (_("[%s exited]\n"),
|
printf_unfiltered (_("[%s exited]\n"),
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
}
|
}
|
else
|
else
|
{
|
{
|
/* Even if LP->PTID is not in the global GDB thread list, the
|
/* Even if LP->PTID is not in the global GDB thread list, the
|
LWP may be - with an additional thread ID. We don't need
|
LWP may be - with an additional thread ID. We don't need
|
to print anything in this case; thread_db is in use and
|
to print anything in this case; thread_db is in use and
|
already took care of that. But it didn't delete the thread
|
already took care of that. But it didn't delete the thread
|
in order to handle zombies correctly. */
|
in order to handle zombies correctly. */
|
|
|
struct thread_info *thr;
|
struct thread_info *thr;
|
|
|
thr = iterate_over_threads (find_thread_from_lwp, &lp->ptid);
|
thr = iterate_over_threads (find_thread_from_lwp, &lp->ptid);
|
if (thr)
|
if (thr)
|
{
|
{
|
if (!ptid_equal (thr->ptid, inferior_ptid))
|
if (!ptid_equal (thr->ptid, inferior_ptid))
|
delete_thread (thr->ptid);
|
delete_thread (thr->ptid);
|
else
|
else
|
record_dead_thread (thr->ptid);
|
record_dead_thread (thr->ptid);
|
}
|
}
|
}
|
}
|
|
|
delete_lwp (lp->ptid);
|
delete_lwp (lp->ptid);
|
}
|
}
|
|
|
/* Attach to the LWP specified by PID. If VERBOSE is non-zero, print
|
/* Attach to the LWP specified by PID. If VERBOSE is non-zero, print
|
a message telling the user that a new LWP has been added to the
|
a message telling the user that a new LWP has been added to the
|
process. Return 0 if successful or -1 if the new LWP could not
|
process. Return 0 if successful or -1 if the new LWP could not
|
be attached. */
|
be attached. */
|
|
|
int
|
int
|
lin_lwp_attach_lwp (ptid_t ptid)
|
lin_lwp_attach_lwp (ptid_t ptid)
|
{
|
{
|
struct lwp_info *lp;
|
struct lwp_info *lp;
|
|
|
gdb_assert (is_lwp (ptid));
|
gdb_assert (is_lwp (ptid));
|
|
|
/* Make sure SIGCHLD is blocked. We don't want SIGCHLD events
|
/* Make sure SIGCHLD is blocked. We don't want SIGCHLD events
|
to interrupt either the ptrace() or waitpid() calls below. */
|
to interrupt either the ptrace() or waitpid() calls below. */
|
if (!sigismember (&blocked_mask, SIGCHLD))
|
if (!sigismember (&blocked_mask, SIGCHLD))
|
{
|
{
|
sigaddset (&blocked_mask, SIGCHLD);
|
sigaddset (&blocked_mask, SIGCHLD);
|
sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
|
sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
|
}
|
}
|
|
|
lp = find_lwp_pid (ptid);
|
lp = find_lwp_pid (ptid);
|
|
|
/* We assume that we're already attached to any LWP that has an id
|
/* We assume that we're already attached to any LWP that has an id
|
equal to the overall process id, and to any LWP that is already
|
equal to the overall process id, and to any LWP that is already
|
in our list of LWPs. If we're not seeing exit events from threads
|
in our list of LWPs. If we're not seeing exit events from threads
|
and we've had PID wraparound since we last tried to stop all threads,
|
and we've had PID wraparound since we last tried to stop all threads,
|
this assumption might be wrong; fortunately, this is very unlikely
|
this assumption might be wrong; fortunately, this is very unlikely
|
to happen. */
|
to happen. */
|
if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL)
|
if (GET_LWP (ptid) != GET_PID (ptid) && lp == NULL)
|
{
|
{
|
pid_t pid;
|
pid_t pid;
|
int status;
|
int status;
|
int cloned = 0;
|
int cloned = 0;
|
|
|
if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0)
|
if (ptrace (PTRACE_ATTACH, GET_LWP (ptid), 0, 0) < 0)
|
{
|
{
|
/* If we fail to attach to the thread, issue a warning,
|
/* If we fail to attach to the thread, issue a warning,
|
but continue. One way this can happen is if thread
|
but continue. One way this can happen is if thread
|
creation is interrupted; as of Linux kernel 2.6.19, a
|
creation is interrupted; as of Linux kernel 2.6.19, a
|
bug may place threads in the thread list and then fail
|
bug may place threads in the thread list and then fail
|
to create them. */
|
to create them. */
|
warning (_("Can't attach %s: %s"), target_pid_to_str (ptid),
|
warning (_("Can't attach %s: %s"), target_pid_to_str (ptid),
|
safe_strerror (errno));
|
safe_strerror (errno));
|
return -1;
|
return -1;
|
}
|
}
|
|
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n",
|
"LLAL: PTRACE_ATTACH %s, 0, 0 (OK)\n",
|
target_pid_to_str (ptid));
|
target_pid_to_str (ptid));
|
|
|
pid = my_waitpid (GET_LWP (ptid), &status, 0);
|
pid = my_waitpid (GET_LWP (ptid), &status, 0);
|
if (pid == -1 && errno == ECHILD)
|
if (pid == -1 && errno == ECHILD)
|
{
|
{
|
/* Try again with __WCLONE to check cloned processes. */
|
/* Try again with __WCLONE to check cloned processes. */
|
pid = my_waitpid (GET_LWP (ptid), &status, __WCLONE);
|
pid = my_waitpid (GET_LWP (ptid), &status, __WCLONE);
|
cloned = 1;
|
cloned = 1;
|
}
|
}
|
|
|
gdb_assert (pid == GET_LWP (ptid)
|
gdb_assert (pid == GET_LWP (ptid)
|
&& WIFSTOPPED (status) && WSTOPSIG (status));
|
&& WIFSTOPPED (status) && WSTOPSIG (status));
|
|
|
if (lp == NULL)
|
if (lp == NULL)
|
lp = add_lwp (ptid);
|
lp = add_lwp (ptid);
|
lp->cloned = cloned;
|
lp->cloned = cloned;
|
|
|
target_post_attach (pid);
|
target_post_attach (pid);
|
|
|
lp->stopped = 1;
|
lp->stopped = 1;
|
|
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
{
|
{
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLAL: waitpid %s received %s\n",
|
"LLAL: waitpid %s received %s\n",
|
target_pid_to_str (ptid),
|
target_pid_to_str (ptid),
|
status_to_str (status));
|
status_to_str (status));
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
/* We assume that the LWP representing the original process is
|
/* We assume that the LWP representing the original process is
|
already stopped. Mark it as stopped in the data structure
|
already stopped. Mark it as stopped in the data structure
|
that the GNU/linux ptrace layer uses to keep track of
|
that the GNU/linux ptrace layer uses to keep track of
|
threads. Note that this won't have already been done since
|
threads. Note that this won't have already been done since
|
the main thread will have, we assume, been stopped by an
|
the main thread will have, we assume, been stopped by an
|
attach from a different layer. */
|
attach from a different layer. */
|
if (lp == NULL)
|
if (lp == NULL)
|
lp = add_lwp (ptid);
|
lp = add_lwp (ptid);
|
lp->stopped = 1;
|
lp->stopped = 1;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void
|
static void
|
linux_nat_attach (char *args, int from_tty)
|
linux_nat_attach (char *args, int from_tty)
|
{
|
{
|
struct lwp_info *lp;
|
struct lwp_info *lp;
|
pid_t pid;
|
pid_t pid;
|
int status;
|
int status;
|
int cloned = 0;
|
int cloned = 0;
|
|
|
/* FIXME: We should probably accept a list of process id's, and
|
/* FIXME: We should probably accept a list of process id's, and
|
attach all of them. */
|
attach all of them. */
|
linux_ops->to_attach (args, from_tty);
|
linux_ops->to_attach (args, from_tty);
|
|
|
/* Make sure the initial process is stopped. The user-level threads
|
/* Make sure the initial process is stopped. The user-level threads
|
layer might want to poke around in the inferior, and that won't
|
layer might want to poke around in the inferior, and that won't
|
work if things haven't stabilized yet. */
|
work if things haven't stabilized yet. */
|
pid = my_waitpid (GET_PID (inferior_ptid), &status, 0);
|
pid = my_waitpid (GET_PID (inferior_ptid), &status, 0);
|
if (pid == -1 && errno == ECHILD)
|
if (pid == -1 && errno == ECHILD)
|
{
|
{
|
warning (_("%s is a cloned process"), target_pid_to_str (inferior_ptid));
|
warning (_("%s is a cloned process"), target_pid_to_str (inferior_ptid));
|
|
|
/* Try again with __WCLONE to check cloned processes. */
|
/* Try again with __WCLONE to check cloned processes. */
|
pid = my_waitpid (GET_PID (inferior_ptid), &status, __WCLONE);
|
pid = my_waitpid (GET_PID (inferior_ptid), &status, __WCLONE);
|
cloned = 1;
|
cloned = 1;
|
}
|
}
|
|
|
gdb_assert (pid == GET_PID (inferior_ptid)
|
gdb_assert (pid == GET_PID (inferior_ptid)
|
&& WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP);
|
&& WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP);
|
|
|
/* Add the initial process as the first LWP to the list. */
|
/* Add the initial process as the first LWP to the list. */
|
inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid));
|
inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid), GET_PID (inferior_ptid));
|
lp = add_lwp (inferior_ptid);
|
lp = add_lwp (inferior_ptid);
|
lp->cloned = cloned;
|
lp->cloned = cloned;
|
|
|
lp->stopped = 1;
|
lp->stopped = 1;
|
|
|
/* Fake the SIGSTOP that core GDB expects. */
|
/* Fake the SIGSTOP that core GDB expects. */
|
lp->status = W_STOPCODE (SIGSTOP);
|
lp->status = W_STOPCODE (SIGSTOP);
|
lp->resumed = 1;
|
lp->resumed = 1;
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
{
|
{
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLA: waitpid %ld, faking SIGSTOP\n", (long) pid);
|
"LLA: waitpid %ld, faking SIGSTOP\n", (long) pid);
|
}
|
}
|
}
|
}
|
|
|
static int
|
static int
|
detach_callback (struct lwp_info *lp, void *data)
|
detach_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status));
|
gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status));
|
|
|
if (debug_linux_nat && lp->status)
|
if (debug_linux_nat && lp->status)
|
fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n",
|
fprintf_unfiltered (gdb_stdlog, "DC: Pending %s for %s on detach.\n",
|
strsignal (WSTOPSIG (lp->status)),
|
strsignal (WSTOPSIG (lp->status)),
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
|
|
while (lp->signalled && lp->stopped)
|
while (lp->signalled && lp->stopped)
|
{
|
{
|
errno = 0;
|
errno = 0;
|
if (ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0,
|
if (ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0,
|
WSTOPSIG (lp->status)) < 0)
|
WSTOPSIG (lp->status)) < 0)
|
error (_("Can't continue %s: %s"), target_pid_to_str (lp->ptid),
|
error (_("Can't continue %s: %s"), target_pid_to_str (lp->ptid),
|
safe_strerror (errno));
|
safe_strerror (errno));
|
|
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"DC: PTRACE_CONTINUE (%s, 0, %s) (OK)\n",
|
"DC: PTRACE_CONTINUE (%s, 0, %s) (OK)\n",
|
target_pid_to_str (lp->ptid),
|
target_pid_to_str (lp->ptid),
|
status_to_str (lp->status));
|
status_to_str (lp->status));
|
|
|
lp->stopped = 0;
|
lp->stopped = 0;
|
lp->signalled = 0;
|
lp->signalled = 0;
|
lp->status = 0;
|
lp->status = 0;
|
/* FIXME drow/2003-08-26: There was a call to stop_wait_callback
|
/* FIXME drow/2003-08-26: There was a call to stop_wait_callback
|
here. But since lp->signalled was cleared above,
|
here. But since lp->signalled was cleared above,
|
stop_wait_callback didn't do anything; the process was left
|
stop_wait_callback didn't do anything; the process was left
|
running. Shouldn't we be waiting for it to stop?
|
running. Shouldn't we be waiting for it to stop?
|
I've removed the call, since stop_wait_callback now does do
|
I've removed the call, since stop_wait_callback now does do
|
something when called with lp->signalled == 0. */
|
something when called with lp->signalled == 0. */
|
|
|
gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status));
|
gdb_assert (lp->status == 0 || WIFSTOPPED (lp->status));
|
}
|
}
|
|
|
/* We don't actually detach from the LWP that has an id equal to the
|
/* We don't actually detach from the LWP that has an id equal to the
|
overall process id just yet. */
|
overall process id just yet. */
|
if (GET_LWP (lp->ptid) != GET_PID (lp->ptid))
|
if (GET_LWP (lp->ptid) != GET_PID (lp->ptid))
|
{
|
{
|
errno = 0;
|
errno = 0;
|
if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0,
|
if (ptrace (PTRACE_DETACH, GET_LWP (lp->ptid), 0,
|
WSTOPSIG (lp->status)) < 0)
|
WSTOPSIG (lp->status)) < 0)
|
error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid),
|
error (_("Can't detach %s: %s"), target_pid_to_str (lp->ptid),
|
safe_strerror (errno));
|
safe_strerror (errno));
|
|
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"PTRACE_DETACH (%s, %s, 0) (OK)\n",
|
"PTRACE_DETACH (%s, %s, 0) (OK)\n",
|
target_pid_to_str (lp->ptid),
|
target_pid_to_str (lp->ptid),
|
strsignal (WSTOPSIG (lp->status)));
|
strsignal (WSTOPSIG (lp->status)));
|
|
|
delete_lwp (lp->ptid);
|
delete_lwp (lp->ptid);
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void
|
static void
|
linux_nat_detach (char *args, int from_tty)
|
linux_nat_detach (char *args, int from_tty)
|
{
|
{
|
iterate_over_lwps (detach_callback, NULL);
|
iterate_over_lwps (detach_callback, NULL);
|
|
|
/* Only the initial process should be left right now. */
|
/* Only the initial process should be left right now. */
|
gdb_assert (num_lwps == 1);
|
gdb_assert (num_lwps == 1);
|
|
|
trap_ptid = null_ptid;
|
trap_ptid = null_ptid;
|
|
|
/* Destroy LWP info; it's no longer valid. */
|
/* Destroy LWP info; it's no longer valid. */
|
init_lwp_list ();
|
init_lwp_list ();
|
|
|
/* Restore the original signal mask. */
|
/* Restore the original signal mask. */
|
sigprocmask (SIG_SETMASK, &normal_mask, NULL);
|
sigprocmask (SIG_SETMASK, &normal_mask, NULL);
|
sigemptyset (&blocked_mask);
|
sigemptyset (&blocked_mask);
|
|
|
inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid));
|
inferior_ptid = pid_to_ptid (GET_PID (inferior_ptid));
|
linux_ops->to_detach (args, from_tty);
|
linux_ops->to_detach (args, from_tty);
|
}
|
}
|
|
|
/* Resume LP. */
|
/* Resume LP. */
|
|
|
static int
|
static int
|
resume_callback (struct lwp_info *lp, void *data)
|
resume_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
if (lp->stopped && lp->status == 0)
|
if (lp->stopped && lp->status == 0)
|
{
|
{
|
linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
|
linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
|
0, TARGET_SIGNAL_0);
|
0, TARGET_SIGNAL_0);
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n",
|
"RC: PTRACE_CONT %s, 0, 0 (resume sibling)\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
lp->stopped = 0;
|
lp->stopped = 0;
|
lp->step = 0;
|
lp->step = 0;
|
memset (&lp->siginfo, 0, sizeof (lp->siginfo));
|
memset (&lp->siginfo, 0, sizeof (lp->siginfo));
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int
|
static int
|
resume_clear_callback (struct lwp_info *lp, void *data)
|
resume_clear_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
lp->resumed = 0;
|
lp->resumed = 0;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int
|
static int
|
resume_set_callback (struct lwp_info *lp, void *data)
|
resume_set_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
lp->resumed = 1;
|
lp->resumed = 1;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void
|
static void
|
linux_nat_resume (ptid_t ptid, int step, enum target_signal signo)
|
linux_nat_resume (ptid_t ptid, int step, enum target_signal signo)
|
{
|
{
|
struct lwp_info *lp;
|
struct lwp_info *lp;
|
int resume_all;
|
int resume_all;
|
|
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLR: Preparing to %s %s, %s, inferior_ptid %s\n",
|
"LLR: Preparing to %s %s, %s, inferior_ptid %s\n",
|
step ? "step" : "resume",
|
step ? "step" : "resume",
|
target_pid_to_str (ptid),
|
target_pid_to_str (ptid),
|
signo ? strsignal (signo) : "0",
|
signo ? strsignal (signo) : "0",
|
target_pid_to_str (inferior_ptid));
|
target_pid_to_str (inferior_ptid));
|
|
|
prune_lwps ();
|
prune_lwps ();
|
|
|
/* A specific PTID means `step only this process id'. */
|
/* A specific PTID means `step only this process id'. */
|
resume_all = (PIDGET (ptid) == -1);
|
resume_all = (PIDGET (ptid) == -1);
|
|
|
if (resume_all)
|
if (resume_all)
|
iterate_over_lwps (resume_set_callback, NULL);
|
iterate_over_lwps (resume_set_callback, NULL);
|
else
|
else
|
iterate_over_lwps (resume_clear_callback, NULL);
|
iterate_over_lwps (resume_clear_callback, NULL);
|
|
|
/* If PID is -1, it's the current inferior that should be
|
/* If PID is -1, it's the current inferior that should be
|
handled specially. */
|
handled specially. */
|
if (PIDGET (ptid) == -1)
|
if (PIDGET (ptid) == -1)
|
ptid = inferior_ptid;
|
ptid = inferior_ptid;
|
|
|
lp = find_lwp_pid (ptid);
|
lp = find_lwp_pid (ptid);
|
gdb_assert (lp != NULL);
|
gdb_assert (lp != NULL);
|
|
|
ptid = pid_to_ptid (GET_LWP (lp->ptid));
|
ptid = pid_to_ptid (GET_LWP (lp->ptid));
|
|
|
/* Remember if we're stepping. */
|
/* Remember if we're stepping. */
|
lp->step = step;
|
lp->step = step;
|
|
|
/* Mark this LWP as resumed. */
|
/* Mark this LWP as resumed. */
|
lp->resumed = 1;
|
lp->resumed = 1;
|
|
|
/* If we have a pending wait status for this thread, there is no
|
/* If we have a pending wait status for this thread, there is no
|
point in resuming the process. But first make sure that
|
point in resuming the process. But first make sure that
|
linux_nat_wait won't preemptively handle the event - we
|
linux_nat_wait won't preemptively handle the event - we
|
should never take this short-circuit if we are going to
|
should never take this short-circuit if we are going to
|
leave LP running, since we have skipped resuming all the
|
leave LP running, since we have skipped resuming all the
|
other threads. This bit of code needs to be synchronized
|
other threads. This bit of code needs to be synchronized
|
with linux_nat_wait. */
|
with linux_nat_wait. */
|
|
|
if (lp->status && WIFSTOPPED (lp->status))
|
if (lp->status && WIFSTOPPED (lp->status))
|
{
|
{
|
int saved_signo = target_signal_from_host (WSTOPSIG (lp->status));
|
int saved_signo = target_signal_from_host (WSTOPSIG (lp->status));
|
|
|
if (signal_stop_state (saved_signo) == 0
|
if (signal_stop_state (saved_signo) == 0
|
&& signal_print_state (saved_signo) == 0
|
&& signal_print_state (saved_signo) == 0
|
&& signal_pass_state (saved_signo) == 1)
|
&& signal_pass_state (saved_signo) == 1)
|
{
|
{
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLR: Not short circuiting for ignored "
|
"LLR: Not short circuiting for ignored "
|
"status 0x%x\n", lp->status);
|
"status 0x%x\n", lp->status);
|
|
|
/* FIXME: What should we do if we are supposed to continue
|
/* FIXME: What should we do if we are supposed to continue
|
this thread with a signal? */
|
this thread with a signal? */
|
gdb_assert (signo == TARGET_SIGNAL_0);
|
gdb_assert (signo == TARGET_SIGNAL_0);
|
signo = saved_signo;
|
signo = saved_signo;
|
lp->status = 0;
|
lp->status = 0;
|
}
|
}
|
}
|
}
|
|
|
if (lp->status)
|
if (lp->status)
|
{
|
{
|
/* FIXME: What should we do if we are supposed to continue
|
/* FIXME: What should we do if we are supposed to continue
|
this thread with a signal? */
|
this thread with a signal? */
|
gdb_assert (signo == TARGET_SIGNAL_0);
|
gdb_assert (signo == TARGET_SIGNAL_0);
|
|
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLR: Short circuiting for status 0x%x\n",
|
"LLR: Short circuiting for status 0x%x\n",
|
lp->status);
|
lp->status);
|
|
|
return;
|
return;
|
}
|
}
|
|
|
/* Mark LWP as not stopped to prevent it from being continued by
|
/* Mark LWP as not stopped to prevent it from being continued by
|
resume_callback. */
|
resume_callback. */
|
lp->stopped = 0;
|
lp->stopped = 0;
|
|
|
if (resume_all)
|
if (resume_all)
|
iterate_over_lwps (resume_callback, NULL);
|
iterate_over_lwps (resume_callback, NULL);
|
|
|
linux_ops->to_resume (ptid, step, signo);
|
linux_ops->to_resume (ptid, step, signo);
|
memset (&lp->siginfo, 0, sizeof (lp->siginfo));
|
memset (&lp->siginfo, 0, sizeof (lp->siginfo));
|
|
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLR: %s %s, %s (resume event thread)\n",
|
"LLR: %s %s, %s (resume event thread)\n",
|
step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
|
step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
|
target_pid_to_str (ptid),
|
target_pid_to_str (ptid),
|
signo ? strsignal (signo) : "0");
|
signo ? strsignal (signo) : "0");
|
}
|
}
|
|
|
/* Issue kill to specified lwp. */
|
/* Issue kill to specified lwp. */
|
|
|
static int tkill_failed;
|
static int tkill_failed;
|
|
|
static int
|
static int
|
kill_lwp (int lwpid, int signo)
|
kill_lwp (int lwpid, int signo)
|
{
|
{
|
errno = 0;
|
errno = 0;
|
|
|
/* Use tkill, if possible, in case we are using nptl threads. If tkill
|
/* Use tkill, if possible, in case we are using nptl threads. If tkill
|
fails, then we are not using nptl threads and we should be using kill. */
|
fails, then we are not using nptl threads and we should be using kill. */
|
|
|
#ifdef HAVE_TKILL_SYSCALL
|
#ifdef HAVE_TKILL_SYSCALL
|
if (!tkill_failed)
|
if (!tkill_failed)
|
{
|
{
|
int ret = syscall (__NR_tkill, lwpid, signo);
|
int ret = syscall (__NR_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);
|
}
|
}
|
|
|
/* Handle a GNU/Linux extended wait response. If we see a clone
|
/* Handle a GNU/Linux extended wait response. If we see a clone
|
event, we need to add the new LWP to our list (and not report the
|
event, we need to add the new LWP to our list (and not report the
|
trap to higher layers). This function returns non-zero if the
|
trap to higher layers). This function returns non-zero if the
|
event should be ignored and we should wait again. If STOPPING is
|
event should be ignored and we should wait again. If STOPPING is
|
true, the new LWP remains stopped, otherwise it is continued. */
|
true, the new LWP remains stopped, otherwise it is continued. */
|
|
|
static int
|
static int
|
linux_handle_extended_wait (struct lwp_info *lp, int status,
|
linux_handle_extended_wait (struct lwp_info *lp, int status,
|
int stopping)
|
int stopping)
|
{
|
{
|
int pid = GET_LWP (lp->ptid);
|
int pid = GET_LWP (lp->ptid);
|
struct target_waitstatus *ourstatus = &lp->waitstatus;
|
struct target_waitstatus *ourstatus = &lp->waitstatus;
|
struct lwp_info *new_lp = NULL;
|
struct lwp_info *new_lp = NULL;
|
int event = status >> 16;
|
int event = status >> 16;
|
|
|
if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK
|
if (event == PTRACE_EVENT_FORK || event == PTRACE_EVENT_VFORK
|
|| event == PTRACE_EVENT_CLONE)
|
|| event == PTRACE_EVENT_CLONE)
|
{
|
{
|
unsigned long new_pid;
|
unsigned long new_pid;
|
int ret;
|
int ret;
|
|
|
ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid);
|
ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid);
|
|
|
/* If we haven't already seen the new PID stop, wait for it now. */
|
/* If we haven't already seen the new PID stop, wait for it now. */
|
if (! pull_pid_from_list (&stopped_pids, new_pid, &status))
|
if (! pull_pid_from_list (&stopped_pids, new_pid, &status))
|
{
|
{
|
/* The new child has a pending SIGSTOP. We can't affect it until it
|
/* The new child has a pending SIGSTOP. We can't affect it until it
|
hits the SIGSTOP, but we're already attached. */
|
hits the SIGSTOP, but we're already attached. */
|
ret = my_waitpid (new_pid, &status,
|
ret = my_waitpid (new_pid, &status,
|
(event == PTRACE_EVENT_CLONE) ? __WCLONE : 0);
|
(event == PTRACE_EVENT_CLONE) ? __WCLONE : 0);
|
if (ret == -1)
|
if (ret == -1)
|
perror_with_name (_("waiting for new child"));
|
perror_with_name (_("waiting for new child"));
|
else if (ret != new_pid)
|
else if (ret != new_pid)
|
internal_error (__FILE__, __LINE__,
|
internal_error (__FILE__, __LINE__,
|
_("wait returned unexpected PID %d"), ret);
|
_("wait returned unexpected PID %d"), ret);
|
else if (!WIFSTOPPED (status))
|
else if (!WIFSTOPPED (status))
|
internal_error (__FILE__, __LINE__,
|
internal_error (__FILE__, __LINE__,
|
_("wait returned unexpected status 0x%x"), status);
|
_("wait returned unexpected status 0x%x"), status);
|
}
|
}
|
|
|
ourstatus->value.related_pid = new_pid;
|
ourstatus->value.related_pid = new_pid;
|
|
|
if (event == PTRACE_EVENT_FORK)
|
if (event == PTRACE_EVENT_FORK)
|
ourstatus->kind = TARGET_WAITKIND_FORKED;
|
ourstatus->kind = TARGET_WAITKIND_FORKED;
|
else if (event == PTRACE_EVENT_VFORK)
|
else if (event == PTRACE_EVENT_VFORK)
|
ourstatus->kind = TARGET_WAITKIND_VFORKED;
|
ourstatus->kind = TARGET_WAITKIND_VFORKED;
|
else
|
else
|
{
|
{
|
ourstatus->kind = TARGET_WAITKIND_IGNORE;
|
ourstatus->kind = TARGET_WAITKIND_IGNORE;
|
new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (inferior_ptid)));
|
new_lp = add_lwp (BUILD_LWP (new_pid, GET_PID (inferior_ptid)));
|
new_lp->cloned = 1;
|
new_lp->cloned = 1;
|
|
|
if (WSTOPSIG (status) != SIGSTOP)
|
if (WSTOPSIG (status) != SIGSTOP)
|
{
|
{
|
/* This can happen if someone starts sending signals to
|
/* This can happen if someone starts sending signals to
|
the new thread before it gets a chance to run, which
|
the new thread before it gets a chance to run, which
|
have a lower number than SIGSTOP (e.g. SIGUSR1).
|
have a lower number than SIGSTOP (e.g. SIGUSR1).
|
This is an unlikely case, and harder to handle for
|
This is an unlikely case, and harder to handle for
|
fork / vfork than for clone, so we do not try - but
|
fork / vfork than for clone, so we do not try - but
|
we handle it for clone events here. We'll send
|
we handle it for clone events here. We'll send
|
the other signal on to the thread below. */
|
the other signal on to the thread below. */
|
|
|
new_lp->signalled = 1;
|
new_lp->signalled = 1;
|
}
|
}
|
else
|
else
|
status = 0;
|
status = 0;
|
|
|
if (stopping)
|
if (stopping)
|
new_lp->stopped = 1;
|
new_lp->stopped = 1;
|
else
|
else
|
{
|
{
|
new_lp->resumed = 1;
|
new_lp->resumed = 1;
|
ptrace (PTRACE_CONT, lp->waitstatus.value.related_pid, 0,
|
ptrace (PTRACE_CONT, lp->waitstatus.value.related_pid, 0,
|
status ? WSTOPSIG (status) : 0);
|
status ? WSTOPSIG (status) : 0);
|
}
|
}
|
|
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LHEW: Got clone event from LWP %ld, resuming\n",
|
"LHEW: Got clone event from LWP %ld, resuming\n",
|
GET_LWP (lp->ptid));
|
GET_LWP (lp->ptid));
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
|
|
return 1;
|
return 1;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
if (event == PTRACE_EVENT_EXEC)
|
if (event == PTRACE_EVENT_EXEC)
|
{
|
{
|
ourstatus->kind = TARGET_WAITKIND_EXECD;
|
ourstatus->kind = TARGET_WAITKIND_EXECD;
|
ourstatus->value.execd_pathname
|
ourstatus->value.execd_pathname
|
= xstrdup (linux_child_pid_to_exec_file (pid));
|
= xstrdup (linux_child_pid_to_exec_file (pid));
|
|
|
if (linux_parent_pid)
|
if (linux_parent_pid)
|
{
|
{
|
detach_breakpoints (linux_parent_pid);
|
detach_breakpoints (linux_parent_pid);
|
ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0);
|
ptrace (PTRACE_DETACH, linux_parent_pid, 0, 0);
|
|
|
linux_parent_pid = 0;
|
linux_parent_pid = 0;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
internal_error (__FILE__, __LINE__,
|
internal_error (__FILE__, __LINE__,
|
_("unknown ptrace event %d"), event);
|
_("unknown ptrace event %d"), event);
|
}
|
}
|
|
|
/* Wait for LP to stop. Returns the wait status, or 0 if the LWP has
|
/* Wait for LP to stop. Returns the wait status, or 0 if the LWP has
|
exited. */
|
exited. */
|
|
|
static int
|
static int
|
wait_lwp (struct lwp_info *lp)
|
wait_lwp (struct lwp_info *lp)
|
{
|
{
|
pid_t pid;
|
pid_t pid;
|
int status;
|
int status;
|
int thread_dead = 0;
|
int thread_dead = 0;
|
|
|
gdb_assert (!lp->stopped);
|
gdb_assert (!lp->stopped);
|
gdb_assert (lp->status == 0);
|
gdb_assert (lp->status == 0);
|
|
|
pid = my_waitpid (GET_LWP (lp->ptid), &status, 0);
|
pid = my_waitpid (GET_LWP (lp->ptid), &status, 0);
|
if (pid == -1 && errno == ECHILD)
|
if (pid == -1 && errno == ECHILD)
|
{
|
{
|
pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE);
|
pid = my_waitpid (GET_LWP (lp->ptid), &status, __WCLONE);
|
if (pid == -1 && errno == ECHILD)
|
if (pid == -1 && errno == ECHILD)
|
{
|
{
|
/* The thread has previously exited. We need to delete it
|
/* The thread has previously exited. We need to delete it
|
now because, for some vendor 2.4 kernels with NPTL
|
now because, for some vendor 2.4 kernels with NPTL
|
support backported, there won't be an exit event unless
|
support backported, there won't be an exit event unless
|
it is the main thread. 2.6 kernels will report an exit
|
it is the main thread. 2.6 kernels will report an exit
|
event for each thread that exits, as expected. */
|
event for each thread that exits, as expected. */
|
thread_dead = 1;
|
thread_dead = 1;
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n",
|
fprintf_unfiltered (gdb_stdlog, "WL: %s vanished.\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
}
|
}
|
}
|
}
|
|
|
if (!thread_dead)
|
if (!thread_dead)
|
{
|
{
|
gdb_assert (pid == GET_LWP (lp->ptid));
|
gdb_assert (pid == GET_LWP (lp->ptid));
|
|
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
{
|
{
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"WL: waitpid %s received %s\n",
|
"WL: waitpid %s received %s\n",
|
target_pid_to_str (lp->ptid),
|
target_pid_to_str (lp->ptid),
|
status_to_str (status));
|
status_to_str (status));
|
}
|
}
|
}
|
}
|
|
|
/* Check if the thread has exited. */
|
/* Check if the thread has exited. */
|
if (WIFEXITED (status) || WIFSIGNALED (status))
|
if (WIFEXITED (status) || WIFSIGNALED (status))
|
{
|
{
|
thread_dead = 1;
|
thread_dead = 1;
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n",
|
fprintf_unfiltered (gdb_stdlog, "WL: %s exited.\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
}
|
}
|
|
|
if (thread_dead)
|
if (thread_dead)
|
{
|
{
|
exit_lwp (lp);
|
exit_lwp (lp);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
gdb_assert (WIFSTOPPED (status));
|
gdb_assert (WIFSTOPPED (status));
|
|
|
/* Handle GNU/Linux's extended waitstatus for trace events. */
|
/* Handle GNU/Linux's extended waitstatus for trace events. */
|
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0)
|
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0)
|
{
|
{
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"WL: Handling extended status 0x%06x\n",
|
"WL: Handling extended status 0x%06x\n",
|
status);
|
status);
|
if (linux_handle_extended_wait (lp, status, 1))
|
if (linux_handle_extended_wait (lp, status, 1))
|
return wait_lwp (lp);
|
return wait_lwp (lp);
|
}
|
}
|
|
|
return status;
|
return status;
|
}
|
}
|
|
|
/* Save the most recent siginfo for LP. This is currently only called
|
/* Save the most recent siginfo for LP. This is currently only called
|
for SIGTRAP; some ports use the si_addr field for
|
for SIGTRAP; some ports use the si_addr field for
|
target_stopped_data_address. In the future, it may also be used to
|
target_stopped_data_address. In the future, it may also be used to
|
restore the siginfo of requeued signals. */
|
restore the siginfo of requeued signals. */
|
|
|
static void
|
static void
|
save_siginfo (struct lwp_info *lp)
|
save_siginfo (struct lwp_info *lp)
|
{
|
{
|
errno = 0;
|
errno = 0;
|
ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid),
|
ptrace (PTRACE_GETSIGINFO, GET_LWP (lp->ptid),
|
(PTRACE_TYPE_ARG3) 0, &lp->siginfo);
|
(PTRACE_TYPE_ARG3) 0, &lp->siginfo);
|
|
|
if (errno != 0)
|
if (errno != 0)
|
memset (&lp->siginfo, 0, sizeof (lp->siginfo));
|
memset (&lp->siginfo, 0, sizeof (lp->siginfo));
|
}
|
}
|
|
|
/* Send a SIGSTOP to LP. */
|
/* Send a SIGSTOP to LP. */
|
|
|
static int
|
static int
|
stop_callback (struct lwp_info *lp, void *data)
|
stop_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
if (!lp->stopped && !lp->signalled)
|
if (!lp->stopped && !lp->signalled)
|
{
|
{
|
int ret;
|
int ret;
|
|
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
{
|
{
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"SC: kill %s **<SIGSTOP>**\n",
|
"SC: kill %s **<SIGSTOP>**\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
}
|
}
|
errno = 0;
|
errno = 0;
|
ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP);
|
ret = kill_lwp (GET_LWP (lp->ptid), SIGSTOP);
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
{
|
{
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"SC: lwp kill %d %s\n",
|
"SC: lwp kill %d %s\n",
|
ret,
|
ret,
|
errno ? safe_strerror (errno) : "ERRNO-OK");
|
errno ? safe_strerror (errno) : "ERRNO-OK");
|
}
|
}
|
|
|
lp->signalled = 1;
|
lp->signalled = 1;
|
gdb_assert (lp->status == 0);
|
gdb_assert (lp->status == 0);
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Wait until LP is stopped. If DATA is non-null it is interpreted as
|
/* Wait until LP is stopped. If DATA is non-null it is interpreted as
|
a pointer to a set of signals to be flushed immediately. */
|
a pointer to a set of signals to be flushed immediately. */
|
|
|
static int
|
static int
|
stop_wait_callback (struct lwp_info *lp, void *data)
|
stop_wait_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
sigset_t *flush_mask = data;
|
sigset_t *flush_mask = data;
|
|
|
if (!lp->stopped)
|
if (!lp->stopped)
|
{
|
{
|
int status;
|
int status;
|
|
|
status = wait_lwp (lp);
|
status = wait_lwp (lp);
|
if (status == 0)
|
if (status == 0)
|
return 0;
|
return 0;
|
|
|
/* Ignore any signals in FLUSH_MASK. */
|
/* Ignore any signals in FLUSH_MASK. */
|
if (flush_mask && sigismember (flush_mask, WSTOPSIG (status)))
|
if (flush_mask && sigismember (flush_mask, WSTOPSIG (status)))
|
{
|
{
|
if (!lp->signalled)
|
if (!lp->signalled)
|
{
|
{
|
lp->stopped = 1;
|
lp->stopped = 1;
|
return 0;
|
return 0;
|
}
|
}
|
|
|
errno = 0;
|
errno = 0;
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"PTRACE_CONT %s, 0, 0 (%s)\n",
|
"PTRACE_CONT %s, 0, 0 (%s)\n",
|
target_pid_to_str (lp->ptid),
|
target_pid_to_str (lp->ptid),
|
errno ? safe_strerror (errno) : "OK");
|
errno ? safe_strerror (errno) : "OK");
|
|
|
return stop_wait_callback (lp, flush_mask);
|
return stop_wait_callback (lp, flush_mask);
|
}
|
}
|
|
|
if (WSTOPSIG (status) != SIGSTOP)
|
if (WSTOPSIG (status) != SIGSTOP)
|
{
|
{
|
if (WSTOPSIG (status) == SIGTRAP)
|
if (WSTOPSIG (status) == SIGTRAP)
|
{
|
{
|
/* If a LWP other than the LWP that we're reporting an
|
/* If a LWP other than the LWP that we're reporting an
|
event for has hit a GDB breakpoint (as opposed to
|
event for has hit a GDB breakpoint (as opposed to
|
some random trap signal), then just arrange for it to
|
some random trap signal), then just arrange for it to
|
hit it again later. We don't keep the SIGTRAP status
|
hit it again later. We don't keep the SIGTRAP status
|
and don't forward the SIGTRAP signal to the LWP. We
|
and don't forward the SIGTRAP signal to the LWP. We
|
will handle the current event, eventually we will
|
will handle the current event, eventually we will
|
resume all LWPs, and this one will get its breakpoint
|
resume all LWPs, and this one will get its breakpoint
|
trap again.
|
trap again.
|
|
|
If we do not do this, then we run the risk that the
|
If we do not do this, then we run the risk that the
|
user will delete or disable the breakpoint, but the
|
user will delete or disable the breakpoint, but the
|
thread will have already tripped on it. */
|
thread will have already tripped on it. */
|
|
|
/* Save the trap's siginfo in case we need it later. */
|
/* Save the trap's siginfo in case we need it later. */
|
save_siginfo (lp);
|
save_siginfo (lp);
|
|
|
/* Now resume this LWP and get the SIGSTOP event. */
|
/* Now resume this LWP and get the SIGSTOP event. */
|
errno = 0;
|
errno = 0;
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
{
|
{
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"PTRACE_CONT %s, 0, 0 (%s)\n",
|
"PTRACE_CONT %s, 0, 0 (%s)\n",
|
target_pid_to_str (lp->ptid),
|
target_pid_to_str (lp->ptid),
|
errno ? safe_strerror (errno) : "OK");
|
errno ? safe_strerror (errno) : "OK");
|
|
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"SWC: Candidate SIGTRAP event in %s\n",
|
"SWC: Candidate SIGTRAP event in %s\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
}
|
}
|
/* Hold the SIGTRAP for handling by linux_nat_wait. */
|
/* Hold the SIGTRAP for handling by linux_nat_wait. */
|
stop_wait_callback (lp, data);
|
stop_wait_callback (lp, data);
|
/* If there's another event, throw it back into the queue. */
|
/* If there's another event, throw it back into the queue. */
|
if (lp->status)
|
if (lp->status)
|
{
|
{
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
{
|
{
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"SWC: kill %s, %s\n",
|
"SWC: kill %s, %s\n",
|
target_pid_to_str (lp->ptid),
|
target_pid_to_str (lp->ptid),
|
status_to_str ((int) status));
|
status_to_str ((int) status));
|
}
|
}
|
kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status));
|
kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (lp->status));
|
}
|
}
|
/* Save the sigtrap event. */
|
/* Save the sigtrap event. */
|
lp->status = status;
|
lp->status = status;
|
return 0;
|
return 0;
|
}
|
}
|
else
|
else
|
{
|
{
|
/* The thread was stopped with a signal other than
|
/* The thread was stopped with a signal other than
|
SIGSTOP, and didn't accidentally trip a breakpoint. */
|
SIGSTOP, and didn't accidentally trip a breakpoint. */
|
|
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
{
|
{
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"SWC: Pending event %s in %s\n",
|
"SWC: Pending event %s in %s\n",
|
status_to_str ((int) status),
|
status_to_str ((int) status),
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
}
|
}
|
/* Now resume this LWP and get the SIGSTOP event. */
|
/* Now resume this LWP and get the SIGSTOP event. */
|
errno = 0;
|
errno = 0;
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"SWC: PTRACE_CONT %s, 0, 0 (%s)\n",
|
"SWC: PTRACE_CONT %s, 0, 0 (%s)\n",
|
target_pid_to_str (lp->ptid),
|
target_pid_to_str (lp->ptid),
|
errno ? safe_strerror (errno) : "OK");
|
errno ? safe_strerror (errno) : "OK");
|
|
|
/* Hold this event/waitstatus while we check to see if
|
/* Hold this event/waitstatus while we check to see if
|
there are any more (we still want to get that SIGSTOP). */
|
there are any more (we still want to get that SIGSTOP). */
|
stop_wait_callback (lp, data);
|
stop_wait_callback (lp, data);
|
/* If the lp->status field is still empty, use it to hold
|
/* If the lp->status field is still empty, use it to hold
|
this event. If not, then this event must be returned
|
this event. If not, then this event must be returned
|
to the event queue of the LWP. */
|
to the event queue of the LWP. */
|
if (lp->status == 0)
|
if (lp->status == 0)
|
lp->status = status;
|
lp->status = status;
|
else
|
else
|
{
|
{
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
{
|
{
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"SWC: kill %s, %s\n",
|
"SWC: kill %s, %s\n",
|
target_pid_to_str (lp->ptid),
|
target_pid_to_str (lp->ptid),
|
status_to_str ((int) status));
|
status_to_str ((int) status));
|
}
|
}
|
kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status));
|
kill_lwp (GET_LWP (lp->ptid), WSTOPSIG (status));
|
}
|
}
|
return 0;
|
return 0;
|
}
|
}
|
}
|
}
|
else
|
else
|
{
|
{
|
/* We caught the SIGSTOP that we intended to catch, so
|
/* We caught the SIGSTOP that we intended to catch, so
|
there's no SIGSTOP pending. */
|
there's no SIGSTOP pending. */
|
lp->stopped = 1;
|
lp->stopped = 1;
|
lp->signalled = 0;
|
lp->signalled = 0;
|
}
|
}
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Check whether PID has any pending signals in FLUSH_MASK. If so set
|
/* Check whether PID has any pending signals in FLUSH_MASK. If so set
|
the appropriate bits in PENDING, and return 1 - otherwise return 0. */
|
the appropriate bits in PENDING, and return 1 - otherwise return 0. */
|
|
|
static int
|
static int
|
linux_nat_has_pending (int pid, sigset_t *pending, sigset_t *flush_mask)
|
linux_nat_has_pending (int pid, sigset_t *pending, sigset_t *flush_mask)
|
{
|
{
|
sigset_t blocked, ignored;
|
sigset_t blocked, ignored;
|
int i;
|
int i;
|
|
|
linux_proc_pending_signals (pid, pending, &blocked, &ignored);
|
linux_proc_pending_signals (pid, pending, &blocked, &ignored);
|
|
|
if (!flush_mask)
|
if (!flush_mask)
|
return 0;
|
return 0;
|
|
|
for (i = 1; i < NSIG; i++)
|
for (i = 1; i < NSIG; i++)
|
if (sigismember (pending, i))
|
if (sigismember (pending, i))
|
if (!sigismember (flush_mask, i)
|
if (!sigismember (flush_mask, i)
|
|| sigismember (&blocked, i)
|
|| sigismember (&blocked, i)
|
|| sigismember (&ignored, i))
|
|| sigismember (&ignored, i))
|
sigdelset (pending, i);
|
sigdelset (pending, i);
|
|
|
if (sigisemptyset (pending))
|
if (sigisemptyset (pending))
|
return 0;
|
return 0;
|
|
|
return 1;
|
return 1;
|
}
|
}
|
|
|
/* DATA is interpreted as a mask of signals to flush. If LP has
|
/* DATA is interpreted as a mask of signals to flush. If LP has
|
signals pending, and they are all in the flush mask, then arrange
|
signals pending, and they are all in the flush mask, then arrange
|
to flush them. LP should be stopped, as should all other threads
|
to flush them. LP should be stopped, as should all other threads
|
it might share a signal queue with. */
|
it might share a signal queue with. */
|
|
|
static int
|
static int
|
flush_callback (struct lwp_info *lp, void *data)
|
flush_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
sigset_t *flush_mask = data;
|
sigset_t *flush_mask = data;
|
sigset_t pending, intersection, blocked, ignored;
|
sigset_t pending, intersection, blocked, ignored;
|
int pid, status;
|
int pid, status;
|
|
|
/* Normally, when an LWP exits, it is removed from the LWP list. The
|
/* Normally, when an LWP exits, it is removed from the LWP list. The
|
last LWP isn't removed till later, however. So if there is only
|
last LWP isn't removed till later, however. So if there is only
|
one LWP on the list, make sure it's alive. */
|
one LWP on the list, make sure it's alive. */
|
if (lwp_list == lp && lp->next == NULL)
|
if (lwp_list == lp && lp->next == NULL)
|
if (!linux_nat_thread_alive (lp->ptid))
|
if (!linux_nat_thread_alive (lp->ptid))
|
return 0;
|
return 0;
|
|
|
/* Just because the LWP is stopped doesn't mean that new signals
|
/* Just because the LWP is stopped doesn't mean that new signals
|
can't arrive from outside, so this function must be careful of
|
can't arrive from outside, so this function must be careful of
|
race conditions. However, because all threads are stopped, we
|
race conditions. However, because all threads are stopped, we
|
can assume that the pending mask will not shrink unless we resume
|
can assume that the pending mask will not shrink unless we resume
|
the LWP, and that it will then get another signal. We can't
|
the LWP, and that it will then get another signal. We can't
|
control which one, however. */
|
control which one, however. */
|
|
|
if (lp->status)
|
if (lp->status)
|
{
|
{
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
printf_unfiltered (_("FC: LP has pending status %06x\n"), lp->status);
|
printf_unfiltered (_("FC: LP has pending status %06x\n"), lp->status);
|
if (WIFSTOPPED (lp->status) && sigismember (flush_mask, WSTOPSIG (lp->status)))
|
if (WIFSTOPPED (lp->status) && sigismember (flush_mask, WSTOPSIG (lp->status)))
|
lp->status = 0;
|
lp->status = 0;
|
}
|
}
|
|
|
/* While there is a pending signal we would like to flush, continue
|
/* While there is a pending signal we would like to flush, continue
|
the inferior and collect another signal. But if there's already
|
the inferior and collect another signal. But if there's already
|
a saved status that we don't want to flush, we can't resume the
|
a saved status that we don't want to flush, we can't resume the
|
inferior - if it stopped for some other reason we wouldn't have
|
inferior - if it stopped for some other reason we wouldn't have
|
anywhere to save the new status. In that case, we must leave the
|
anywhere to save the new status. In that case, we must leave the
|
signal unflushed (and possibly generate an extra SIGINT stop).
|
signal unflushed (and possibly generate an extra SIGINT stop).
|
That's much less bad than losing a signal. */
|
That's much less bad than losing a signal. */
|
while (lp->status == 0
|
while (lp->status == 0
|
&& linux_nat_has_pending (GET_LWP (lp->ptid), &pending, flush_mask))
|
&& linux_nat_has_pending (GET_LWP (lp->ptid), &pending, flush_mask))
|
{
|
{
|
int ret;
|
int ret;
|
|
|
errno = 0;
|
errno = 0;
|
ret = ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
ret = ptrace (PTRACE_CONT, GET_LWP (lp->ptid), 0, 0);
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stderr,
|
fprintf_unfiltered (gdb_stderr,
|
"FC: Sent PTRACE_CONT, ret %d %d\n", ret, errno);
|
"FC: Sent PTRACE_CONT, ret %d %d\n", ret, errno);
|
|
|
lp->stopped = 0;
|
lp->stopped = 0;
|
stop_wait_callback (lp, flush_mask);
|
stop_wait_callback (lp, flush_mask);
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stderr,
|
fprintf_unfiltered (gdb_stderr,
|
"FC: Wait finished; saved status is %d\n",
|
"FC: Wait finished; saved status is %d\n",
|
lp->status);
|
lp->status);
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Return non-zero if LP has a wait status pending. */
|
/* Return non-zero if LP has a wait status pending. */
|
|
|
static int
|
static int
|
status_callback (struct lwp_info *lp, void *data)
|
status_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
/* Only report a pending wait status if we pretend that this has
|
/* Only report a pending wait status if we pretend that this has
|
indeed been resumed. */
|
indeed been resumed. */
|
return (lp->status != 0 && lp->resumed);
|
return (lp->status != 0 && lp->resumed);
|
}
|
}
|
|
|
/* Return non-zero if LP isn't stopped. */
|
/* Return non-zero if LP isn't stopped. */
|
|
|
static int
|
static int
|
running_callback (struct lwp_info *lp, void *data)
|
running_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
return (lp->stopped == 0 || (lp->status != 0 && lp->resumed));
|
return (lp->stopped == 0 || (lp->status != 0 && lp->resumed));
|
}
|
}
|
|
|
/* Count the LWP's that have had events. */
|
/* Count the LWP's that have had events. */
|
|
|
static int
|
static int
|
count_events_callback (struct lwp_info *lp, void *data)
|
count_events_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
int *count = data;
|
int *count = data;
|
|
|
gdb_assert (count != NULL);
|
gdb_assert (count != NULL);
|
|
|
/* Count only LWPs that have a SIGTRAP event pending. */
|
/* Count only LWPs that have a SIGTRAP event pending. */
|
if (lp->status != 0
|
if (lp->status != 0
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
|
(*count)++;
|
(*count)++;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Select the LWP (if any) that is currently being single-stepped. */
|
/* Select the LWP (if any) that is currently being single-stepped. */
|
|
|
static int
|
static int
|
select_singlestep_lwp_callback (struct lwp_info *lp, void *data)
|
select_singlestep_lwp_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
if (lp->step && lp->status != 0)
|
if (lp->step && lp->status != 0)
|
return 1;
|
return 1;
|
else
|
else
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Select the Nth LWP that has had a SIGTRAP event. */
|
/* Select the Nth LWP that has had a SIGTRAP event. */
|
|
|
static int
|
static int
|
select_event_lwp_callback (struct lwp_info *lp, void *data)
|
select_event_lwp_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
int *selector = data;
|
int *selector = data;
|
|
|
gdb_assert (selector != NULL);
|
gdb_assert (selector != NULL);
|
|
|
/* Select only LWPs that have a SIGTRAP event pending. */
|
/* Select only LWPs that have a SIGTRAP event pending. */
|
if (lp->status != 0
|
if (lp->status != 0
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP)
|
if ((*selector)-- == 0)
|
if ((*selector)-- == 0)
|
return 1;
|
return 1;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int
|
static int
|
cancel_breakpoints_callback (struct lwp_info *lp, void *data)
|
cancel_breakpoints_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
struct lwp_info *event_lp = data;
|
struct lwp_info *event_lp = data;
|
|
|
/* Leave the LWP that has been elected to receive a SIGTRAP alone. */
|
/* Leave the LWP that has been elected to receive a SIGTRAP alone. */
|
if (lp == event_lp)
|
if (lp == event_lp)
|
return 0;
|
return 0;
|
|
|
/* If a LWP other than the LWP that we're reporting an event for has
|
/* If a LWP other than the LWP that we're reporting an event for has
|
hit a GDB breakpoint (as opposed to some random trap signal),
|
hit a GDB breakpoint (as opposed to some random trap signal),
|
then just arrange for it to hit it again later. We don't keep
|
then just arrange for it to hit it again later. We don't keep
|
the SIGTRAP status and don't forward the SIGTRAP signal to the
|
the SIGTRAP status and don't forward the SIGTRAP signal to the
|
LWP. We will handle the current event, eventually we will resume
|
LWP. We will handle the current event, eventually we will resume
|
all LWPs, and this one will get its breakpoint trap again.
|
all LWPs, and this one will get its breakpoint trap again.
|
|
|
If we do not do this, then we run the risk that the user will
|
If we do not do this, then we run the risk that the user will
|
delete or disable the breakpoint, but the LWP will have already
|
delete or disable the breakpoint, but the LWP will have already
|
tripped on it. */
|
tripped on it. */
|
|
|
if (lp->status != 0
|
if (lp->status != 0
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP
|
&& WIFSTOPPED (lp->status) && WSTOPSIG (lp->status) == SIGTRAP
|
&& breakpoint_inserted_here_p (read_pc_pid (lp->ptid) -
|
&& breakpoint_inserted_here_p (read_pc_pid (lp->ptid) -
|
gdbarch_decr_pc_after_break
|
gdbarch_decr_pc_after_break
|
(current_gdbarch)))
|
(current_gdbarch)))
|
{
|
{
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"CBC: Push back breakpoint for %s\n",
|
"CBC: Push back breakpoint for %s\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
|
|
/* Back up the PC if necessary. */
|
/* Back up the PC if necessary. */
|
if (gdbarch_decr_pc_after_break (current_gdbarch))
|
if (gdbarch_decr_pc_after_break (current_gdbarch))
|
write_pc_pid (read_pc_pid (lp->ptid) - gdbarch_decr_pc_after_break
|
write_pc_pid (read_pc_pid (lp->ptid) - gdbarch_decr_pc_after_break
|
(current_gdbarch),
|
(current_gdbarch),
|
lp->ptid);
|
lp->ptid);
|
|
|
/* Throw away the SIGTRAP. */
|
/* Throw away the SIGTRAP. */
|
lp->status = 0;
|
lp->status = 0;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Select one LWP out of those that have events pending. */
|
/* Select one LWP out of those that have events pending. */
|
|
|
static void
|
static void
|
select_event_lwp (struct lwp_info **orig_lp, int *status)
|
select_event_lwp (struct lwp_info **orig_lp, int *status)
|
{
|
{
|
int num_events = 0;
|
int num_events = 0;
|
int random_selector;
|
int random_selector;
|
struct lwp_info *event_lp;
|
struct lwp_info *event_lp;
|
|
|
/* Record the wait status for the original LWP. */
|
/* Record the wait status for the original LWP. */
|
(*orig_lp)->status = *status;
|
(*orig_lp)->status = *status;
|
|
|
/* Give preference to any LWP that is being single-stepped. */
|
/* Give preference to any LWP that is being single-stepped. */
|
event_lp = iterate_over_lwps (select_singlestep_lwp_callback, NULL);
|
event_lp = iterate_over_lwps (select_singlestep_lwp_callback, NULL);
|
if (event_lp != NULL)
|
if (event_lp != NULL)
|
{
|
{
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"SEL: Select single-step %s\n",
|
"SEL: Select single-step %s\n",
|
target_pid_to_str (event_lp->ptid));
|
target_pid_to_str (event_lp->ptid));
|
}
|
}
|
else
|
else
|
{
|
{
|
/* No single-stepping LWP. Select one at random, out of those
|
/* No single-stepping LWP. Select one at random, out of those
|
which have had SIGTRAP events. */
|
which have had SIGTRAP events. */
|
|
|
/* First see how many SIGTRAP events we have. */
|
/* First see how many SIGTRAP events we have. */
|
iterate_over_lwps (count_events_callback, &num_events);
|
iterate_over_lwps (count_events_callback, &num_events);
|
|
|
/* Now randomly pick a LWP out of those that have had a SIGTRAP. */
|
/* Now randomly pick a LWP out of those that have had a SIGTRAP. */
|
random_selector = (int)
|
random_selector = (int)
|
((num_events * (double) rand ()) / (RAND_MAX + 1.0));
|
((num_events * (double) rand ()) / (RAND_MAX + 1.0));
|
|
|
if (debug_linux_nat && num_events > 1)
|
if (debug_linux_nat && num_events > 1)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"SEL: Found %d SIGTRAP events, selecting #%d\n",
|
"SEL: Found %d SIGTRAP events, selecting #%d\n",
|
num_events, random_selector);
|
num_events, random_selector);
|
|
|
event_lp = iterate_over_lwps (select_event_lwp_callback,
|
event_lp = iterate_over_lwps (select_event_lwp_callback,
|
&random_selector);
|
&random_selector);
|
}
|
}
|
|
|
if (event_lp != NULL)
|
if (event_lp != NULL)
|
{
|
{
|
/* Switch the event LWP. */
|
/* Switch the event LWP. */
|
*orig_lp = event_lp;
|
*orig_lp = event_lp;
|
*status = event_lp->status;
|
*status = event_lp->status;
|
}
|
}
|
|
|
/* Flush the wait status for the event LWP. */
|
/* Flush the wait status for the event LWP. */
|
(*orig_lp)->status = 0;
|
(*orig_lp)->status = 0;
|
}
|
}
|
|
|
/* Return non-zero if LP has been resumed. */
|
/* Return non-zero if LP has been resumed. */
|
|
|
static int
|
static int
|
resumed_callback (struct lwp_info *lp, void *data)
|
resumed_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
return lp->resumed;
|
return lp->resumed;
|
}
|
}
|
|
|
/* Stop an active thread, verify it still exists, then resume it. */
|
/* Stop an active thread, verify it still exists, then resume it. */
|
|
|
static int
|
static int
|
stop_and_resume_callback (struct lwp_info *lp, void *data)
|
stop_and_resume_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
struct lwp_info *ptr;
|
struct lwp_info *ptr;
|
|
|
if (!lp->stopped && !lp->signalled)
|
if (!lp->stopped && !lp->signalled)
|
{
|
{
|
stop_callback (lp, NULL);
|
stop_callback (lp, NULL);
|
stop_wait_callback (lp, NULL);
|
stop_wait_callback (lp, NULL);
|
/* Resume if the lwp still exists. */
|
/* Resume if the lwp still exists. */
|
for (ptr = lwp_list; ptr; ptr = ptr->next)
|
for (ptr = lwp_list; ptr; ptr = ptr->next)
|
if (lp == ptr)
|
if (lp == ptr)
|
{
|
{
|
resume_callback (lp, NULL);
|
resume_callback (lp, NULL);
|
resume_set_callback (lp, NULL);
|
resume_set_callback (lp, NULL);
|
}
|
}
|
}
|
}
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static ptid_t
|
static ptid_t
|
linux_nat_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
|
linux_nat_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
|
{
|
{
|
struct lwp_info *lp = NULL;
|
struct lwp_info *lp = NULL;
|
int options = 0;
|
int options = 0;
|
int status = 0;
|
int status = 0;
|
pid_t pid = PIDGET (ptid);
|
pid_t pid = PIDGET (ptid);
|
sigset_t flush_mask;
|
sigset_t flush_mask;
|
|
|
/* The first time we get here after starting a new inferior, we may
|
/* The first time we get here after starting a new inferior, we may
|
not have added it to the LWP list yet - this is the earliest
|
not have added it to the LWP list yet - this is the earliest
|
moment at which we know its PID. */
|
moment at which we know its PID. */
|
if (num_lwps == 0)
|
if (num_lwps == 0)
|
{
|
{
|
gdb_assert (!is_lwp (inferior_ptid));
|
gdb_assert (!is_lwp (inferior_ptid));
|
|
|
inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid),
|
inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid),
|
GET_PID (inferior_ptid));
|
GET_PID (inferior_ptid));
|
lp = add_lwp (inferior_ptid);
|
lp = add_lwp (inferior_ptid);
|
lp->resumed = 1;
|
lp->resumed = 1;
|
}
|
}
|
|
|
sigemptyset (&flush_mask);
|
sigemptyset (&flush_mask);
|
|
|
/* Make sure SIGCHLD is blocked. */
|
/* Make sure SIGCHLD is blocked. */
|
if (!sigismember (&blocked_mask, SIGCHLD))
|
if (!sigismember (&blocked_mask, SIGCHLD))
|
{
|
{
|
sigaddset (&blocked_mask, SIGCHLD);
|
sigaddset (&blocked_mask, SIGCHLD);
|
sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
|
sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
|
}
|
}
|
|
|
retry:
|
retry:
|
|
|
/* Make sure there is at least one LWP that has been resumed. */
|
/* Make sure there is at least one LWP that has been resumed. */
|
gdb_assert (iterate_over_lwps (resumed_callback, NULL));
|
gdb_assert (iterate_over_lwps (resumed_callback, NULL));
|
|
|
/* First check if there is a LWP with a wait status pending. */
|
/* First check if there is a LWP with a wait status pending. */
|
if (pid == -1)
|
if (pid == -1)
|
{
|
{
|
/* Any LWP that's been resumed will do. */
|
/* Any LWP that's been resumed will do. */
|
lp = iterate_over_lwps (status_callback, NULL);
|
lp = iterate_over_lwps (status_callback, NULL);
|
if (lp)
|
if (lp)
|
{
|
{
|
status = lp->status;
|
status = lp->status;
|
lp->status = 0;
|
lp->status = 0;
|
|
|
if (debug_linux_nat && status)
|
if (debug_linux_nat && status)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLW: Using pending wait status %s for %s.\n",
|
"LLW: Using pending wait status %s for %s.\n",
|
status_to_str (status),
|
status_to_str (status),
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
}
|
}
|
|
|
/* But if we don't fine one, we'll have to wait, and check both
|
/* But if we don't fine one, we'll have to wait, and check both
|
cloned and uncloned processes. We start with the cloned
|
cloned and uncloned processes. We start with the cloned
|
processes. */
|
processes. */
|
options = __WCLONE | WNOHANG;
|
options = __WCLONE | WNOHANG;
|
}
|
}
|
else if (is_lwp (ptid))
|
else if (is_lwp (ptid))
|
{
|
{
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLW: Waiting for specific LWP %s.\n",
|
"LLW: Waiting for specific LWP %s.\n",
|
target_pid_to_str (ptid));
|
target_pid_to_str (ptid));
|
|
|
/* We have a specific LWP to check. */
|
/* We have a specific LWP to check. */
|
lp = find_lwp_pid (ptid);
|
lp = find_lwp_pid (ptid);
|
gdb_assert (lp);
|
gdb_assert (lp);
|
status = lp->status;
|
status = lp->status;
|
lp->status = 0;
|
lp->status = 0;
|
|
|
if (debug_linux_nat && status)
|
if (debug_linux_nat && status)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLW: Using pending wait status %s for %s.\n",
|
"LLW: Using pending wait status %s for %s.\n",
|
status_to_str (status),
|
status_to_str (status),
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
|
|
/* If we have to wait, take into account whether PID is a cloned
|
/* If we have to wait, take into account whether PID is a cloned
|
process or not. And we have to convert it to something that
|
process or not. And we have to convert it to something that
|
the layer beneath us can understand. */
|
the layer beneath us can understand. */
|
options = lp->cloned ? __WCLONE : 0;
|
options = lp->cloned ? __WCLONE : 0;
|
pid = GET_LWP (ptid);
|
pid = GET_LWP (ptid);
|
}
|
}
|
|
|
if (status && lp->signalled)
|
if (status && lp->signalled)
|
{
|
{
|
/* A pending SIGSTOP may interfere with the normal stream of
|
/* A pending SIGSTOP may interfere with the normal stream of
|
events. In a typical case where interference is a problem,
|
events. In a typical case where interference is a problem,
|
we have a SIGSTOP signal pending for LWP A while
|
we have a SIGSTOP signal pending for LWP A while
|
single-stepping it, encounter an event in LWP B, and take the
|
single-stepping it, encounter an event in LWP B, and take the
|
pending SIGSTOP while trying to stop LWP A. After processing
|
pending SIGSTOP while trying to stop LWP A. After processing
|
the event in LWP B, LWP A is continued, and we'll never see
|
the event in LWP B, LWP A is continued, and we'll never see
|
the SIGTRAP associated with the last time we were
|
the SIGTRAP associated with the last time we were
|
single-stepping LWP A. */
|
single-stepping LWP A. */
|
|
|
/* Resume the thread. It should halt immediately returning the
|
/* Resume the thread. It should halt immediately returning the
|
pending SIGSTOP. */
|
pending SIGSTOP. */
|
registers_changed ();
|
registers_changed ();
|
linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
|
linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
|
lp->step, TARGET_SIGNAL_0);
|
lp->step, TARGET_SIGNAL_0);
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLW: %s %s, 0, 0 (expect SIGSTOP)\n",
|
"LLW: %s %s, 0, 0 (expect SIGSTOP)\n",
|
lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
|
lp->step ? "PTRACE_SINGLESTEP" : "PTRACE_CONT",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
lp->stopped = 0;
|
lp->stopped = 0;
|
gdb_assert (lp->resumed);
|
gdb_assert (lp->resumed);
|
|
|
/* This should catch the pending SIGSTOP. */
|
/* This should catch the pending SIGSTOP. */
|
stop_wait_callback (lp, NULL);
|
stop_wait_callback (lp, NULL);
|
}
|
}
|
|
|
set_sigint_trap (); /* Causes SIGINT to be passed on to the
|
set_sigint_trap (); /* Causes SIGINT to be passed on to the
|
attached process. */
|
attached process. */
|
set_sigio_trap ();
|
set_sigio_trap ();
|
|
|
while (status == 0)
|
while (status == 0)
|
{
|
{
|
pid_t lwpid;
|
pid_t lwpid;
|
|
|
lwpid = my_waitpid (pid, &status, options);
|
lwpid = my_waitpid (pid, &status, options);
|
if (lwpid > 0)
|
if (lwpid > 0)
|
{
|
{
|
gdb_assert (pid == -1 || lwpid == pid);
|
gdb_assert (pid == -1 || lwpid == pid);
|
|
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
{
|
{
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLW: waitpid %ld received %s\n",
|
"LLW: waitpid %ld received %s\n",
|
(long) lwpid, status_to_str (status));
|
(long) lwpid, status_to_str (status));
|
}
|
}
|
|
|
lp = find_lwp_pid (pid_to_ptid (lwpid));
|
lp = find_lwp_pid (pid_to_ptid (lwpid));
|
|
|
/* Check for stop events reported by a process we didn't
|
/* Check for stop events reported by a process we didn't
|
already know about - anything not already in our LWP
|
already know about - anything not already in our LWP
|
list.
|
list.
|
|
|
If we're expecting to receive stopped processes after
|
If we're expecting to receive stopped processes after
|
fork, vfork, and clone events, then we'll just add the
|
fork, vfork, and clone events, then we'll just add the
|
new one to our list and go back to waiting for the event
|
new one to our list and go back to waiting for the event
|
to be reported - the stopped process might be returned
|
to be reported - the stopped process might be returned
|
from waitpid before or after the event is. */
|
from waitpid before or after the event is. */
|
if (WIFSTOPPED (status) && !lp)
|
if (WIFSTOPPED (status) && !lp)
|
{
|
{
|
linux_record_stopped_pid (lwpid, status);
|
linux_record_stopped_pid (lwpid, status);
|
status = 0;
|
status = 0;
|
continue;
|
continue;
|
}
|
}
|
|
|
/* Make sure we don't report an event for the exit of an LWP not in
|
/* Make sure we don't report an event for the exit of an LWP not in
|
our list, i.e. not part of the current process. This can happen
|
our list, i.e. not part of the current process. This can happen
|
if we detach from a program we original forked and then it
|
if we detach from a program we original forked and then it
|
exits. */
|
exits. */
|
if (!WIFSTOPPED (status) && !lp)
|
if (!WIFSTOPPED (status) && !lp)
|
{
|
{
|
status = 0;
|
status = 0;
|
continue;
|
continue;
|
}
|
}
|
|
|
/* NOTE drow/2003-06-17: This code seems to be meant for debugging
|
/* NOTE drow/2003-06-17: This code seems to be meant for debugging
|
CLONE_PTRACE processes which do not use the thread library -
|
CLONE_PTRACE processes which do not use the thread library -
|
otherwise we wouldn't find the new LWP this way. That doesn't
|
otherwise we wouldn't find the new LWP this way. That doesn't
|
currently work, and the following code is currently unreachable
|
currently work, and the following code is currently unreachable
|
due to the two blocks above. If it's fixed some day, this code
|
due to the two blocks above. If it's fixed some day, this code
|
should be broken out into a function so that we can also pick up
|
should be broken out into a function so that we can also pick up
|
LWPs from the new interface. */
|
LWPs from the new interface. */
|
if (!lp)
|
if (!lp)
|
{
|
{
|
lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid)));
|
lp = add_lwp (BUILD_LWP (lwpid, GET_PID (inferior_ptid)));
|
if (options & __WCLONE)
|
if (options & __WCLONE)
|
lp->cloned = 1;
|
lp->cloned = 1;
|
|
|
gdb_assert (WIFSTOPPED (status)
|
gdb_assert (WIFSTOPPED (status)
|
&& WSTOPSIG (status) == SIGSTOP);
|
&& WSTOPSIG (status) == SIGSTOP);
|
lp->signalled = 1;
|
lp->signalled = 1;
|
|
|
if (!in_thread_list (inferior_ptid))
|
if (!in_thread_list (inferior_ptid))
|
{
|
{
|
inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid),
|
inferior_ptid = BUILD_LWP (GET_PID (inferior_ptid),
|
GET_PID (inferior_ptid));
|
GET_PID (inferior_ptid));
|
add_thread (inferior_ptid);
|
add_thread (inferior_ptid);
|
}
|
}
|
|
|
add_thread (lp->ptid);
|
add_thread (lp->ptid);
|
}
|
}
|
|
|
/* Save the trap's siginfo in case we need it later. */
|
/* Save the trap's siginfo in case we need it later. */
|
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP)
|
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP)
|
save_siginfo (lp);
|
save_siginfo (lp);
|
|
|
/* Handle GNU/Linux's extended waitstatus for trace events. */
|
/* Handle GNU/Linux's extended waitstatus for trace events. */
|
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0)
|
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0)
|
{
|
{
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLW: Handling extended status 0x%06x\n",
|
"LLW: Handling extended status 0x%06x\n",
|
status);
|
status);
|
if (linux_handle_extended_wait (lp, status, 0))
|
if (linux_handle_extended_wait (lp, status, 0))
|
{
|
{
|
status = 0;
|
status = 0;
|
continue;
|
continue;
|
}
|
}
|
}
|
}
|
|
|
/* Check if the thread has exited. */
|
/* Check if the thread has exited. */
|
if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1)
|
if ((WIFEXITED (status) || WIFSIGNALED (status)) && num_lwps > 1)
|
{
|
{
|
/* If this is the main thread, we must stop all threads and
|
/* If this is the main thread, we must stop all threads and
|
verify if they are still alive. This is because in the nptl
|
verify if they are still alive. This is because in the nptl
|
thread model, there is no signal issued for exiting LWPs
|
thread model, there is no signal issued for exiting LWPs
|
other than the main thread. We only get the main thread
|
other than the main thread. We only get the main thread
|
exit signal once all child threads have already exited.
|
exit signal once all child threads have already exited.
|
If we stop all the threads and use the stop_wait_callback
|
If we stop all the threads and use the stop_wait_callback
|
to check if they have exited we can determine whether this
|
to check if they have exited we can determine whether this
|
signal should be ignored or whether it means the end of the
|
signal should be ignored or whether it means the end of the
|
debugged application, regardless of which threading model
|
debugged application, regardless of which threading model
|
is being used. */
|
is being used. */
|
if (GET_PID (lp->ptid) == GET_LWP (lp->ptid))
|
if (GET_PID (lp->ptid) == GET_LWP (lp->ptid))
|
{
|
{
|
lp->stopped = 1;
|
lp->stopped = 1;
|
iterate_over_lwps (stop_and_resume_callback, NULL);
|
iterate_over_lwps (stop_and_resume_callback, NULL);
|
}
|
}
|
|
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLW: %s exited.\n",
|
"LLW: %s exited.\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
|
|
exit_lwp (lp);
|
exit_lwp (lp);
|
|
|
/* If there is at least one more LWP, then the exit signal
|
/* If there is at least one more LWP, then the exit signal
|
was not the end of the debugged application and should be
|
was not the end of the debugged application and should be
|
ignored. */
|
ignored. */
|
if (num_lwps > 0)
|
if (num_lwps > 0)
|
{
|
{
|
/* Make sure there is at least one thread running. */
|
/* Make sure there is at least one thread running. */
|
gdb_assert (iterate_over_lwps (running_callback, NULL));
|
gdb_assert (iterate_over_lwps (running_callback, NULL));
|
|
|
/* Discard the event. */
|
/* Discard the event. */
|
status = 0;
|
status = 0;
|
continue;
|
continue;
|
}
|
}
|
}
|
}
|
|
|
/* Check if the current LWP has previously exited. In the nptl
|
/* Check if the current LWP has previously exited. In the nptl
|
thread model, LWPs other than the main thread do not issue
|
thread model, LWPs other than the main thread do not issue
|
signals when they exit so we must check whenever the thread
|
signals when they exit so we must check whenever the thread
|
has stopped. A similar check is made in stop_wait_callback(). */
|
has stopped. A similar check is made in stop_wait_callback(). */
|
if (num_lwps > 1 && !linux_nat_thread_alive (lp->ptid))
|
if (num_lwps > 1 && !linux_nat_thread_alive (lp->ptid))
|
{
|
{
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLW: %s exited.\n",
|
"LLW: %s exited.\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
|
|
exit_lwp (lp);
|
exit_lwp (lp);
|
|
|
/* Make sure there is at least one thread running. */
|
/* Make sure there is at least one thread running. */
|
gdb_assert (iterate_over_lwps (running_callback, NULL));
|
gdb_assert (iterate_over_lwps (running_callback, NULL));
|
|
|
/* Discard the event. */
|
/* Discard the event. */
|
status = 0;
|
status = 0;
|
continue;
|
continue;
|
}
|
}
|
|
|
/* Make sure we don't report a SIGSTOP that we sent
|
/* Make sure we don't report a SIGSTOP that we sent
|
ourselves in an attempt to stop an LWP. */
|
ourselves in an attempt to stop an LWP. */
|
if (lp->signalled
|
if (lp->signalled
|
&& WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP)
|
&& WIFSTOPPED (status) && WSTOPSIG (status) == SIGSTOP)
|
{
|
{
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLW: Delayed SIGSTOP caught for %s.\n",
|
"LLW: Delayed SIGSTOP caught for %s.\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
|
|
/* This is a delayed SIGSTOP. */
|
/* This is a delayed SIGSTOP. */
|
lp->signalled = 0;
|
lp->signalled = 0;
|
|
|
registers_changed ();
|
registers_changed ();
|
linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
|
linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
|
lp->step, TARGET_SIGNAL_0);
|
lp->step, TARGET_SIGNAL_0);
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLW: %s %s, 0, 0 (discard SIGSTOP)\n",
|
"LLW: %s %s, 0, 0 (discard SIGSTOP)\n",
|
lp->step ?
|
lp->step ?
|
"PTRACE_SINGLESTEP" : "PTRACE_CONT",
|
"PTRACE_SINGLESTEP" : "PTRACE_CONT",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
|
|
lp->stopped = 0;
|
lp->stopped = 0;
|
gdb_assert (lp->resumed);
|
gdb_assert (lp->resumed);
|
|
|
/* Discard the event. */
|
/* Discard the event. */
|
status = 0;
|
status = 0;
|
continue;
|
continue;
|
}
|
}
|
|
|
break;
|
break;
|
}
|
}
|
|
|
if (pid == -1)
|
if (pid == -1)
|
{
|
{
|
/* Alternate between checking cloned and uncloned processes. */
|
/* Alternate between checking cloned and uncloned processes. */
|
options ^= __WCLONE;
|
options ^= __WCLONE;
|
|
|
/* And suspend every time we have checked both. */
|
/* And suspend every time we have checked both. */
|
if (options & __WCLONE)
|
if (options & __WCLONE)
|
sigsuspend (&suspend_mask);
|
sigsuspend (&suspend_mask);
|
}
|
}
|
|
|
/* We shouldn't end up here unless we want to try again. */
|
/* We shouldn't end up here unless we want to try again. */
|
gdb_assert (status == 0);
|
gdb_assert (status == 0);
|
}
|
}
|
|
|
clear_sigio_trap ();
|
clear_sigio_trap ();
|
clear_sigint_trap ();
|
clear_sigint_trap ();
|
|
|
gdb_assert (lp);
|
gdb_assert (lp);
|
|
|
/* Don't report signals that GDB isn't interested in, such as
|
/* Don't report signals that GDB isn't interested in, such as
|
signals that are neither printed nor stopped upon. Stopping all
|
signals that are neither printed nor stopped upon. Stopping all
|
threads can be a bit time-consuming so if we want decent
|
threads can be a bit time-consuming so if we want decent
|
performance with heavily multi-threaded programs, especially when
|
performance with heavily multi-threaded programs, especially when
|
they're using a high frequency timer, we'd better avoid it if we
|
they're using a high frequency timer, we'd better avoid it if we
|
can. */
|
can. */
|
|
|
if (WIFSTOPPED (status))
|
if (WIFSTOPPED (status))
|
{
|
{
|
int signo = target_signal_from_host (WSTOPSIG (status));
|
int signo = target_signal_from_host (WSTOPSIG (status));
|
|
|
/* If we get a signal while single-stepping, we may need special
|
/* If we get a signal while single-stepping, we may need special
|
care, e.g. to skip the signal handler. Defer to common code. */
|
care, e.g. to skip the signal handler. Defer to common code. */
|
if (!lp->step
|
if (!lp->step
|
&& signal_stop_state (signo) == 0
|
&& signal_stop_state (signo) == 0
|
&& signal_print_state (signo) == 0
|
&& signal_print_state (signo) == 0
|
&& signal_pass_state (signo) == 1)
|
&& signal_pass_state (signo) == 1)
|
{
|
{
|
/* FIMXE: kettenis/2001-06-06: Should we resume all threads
|
/* FIMXE: kettenis/2001-06-06: Should we resume all threads
|
here? It is not clear we should. GDB may not expect
|
here? It is not clear we should. GDB may not expect
|
other threads to run. On the other hand, not resuming
|
other threads to run. On the other hand, not resuming
|
newly attached threads may cause an unwanted delay in
|
newly attached threads may cause an unwanted delay in
|
getting them running. */
|
getting them running. */
|
registers_changed ();
|
registers_changed ();
|
linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
|
linux_ops->to_resume (pid_to_ptid (GET_LWP (lp->ptid)),
|
lp->step, signo);
|
lp->step, signo);
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLW: %s %s, %s (preempt 'handle')\n",
|
"LLW: %s %s, %s (preempt 'handle')\n",
|
lp->step ?
|
lp->step ?
|
"PTRACE_SINGLESTEP" : "PTRACE_CONT",
|
"PTRACE_SINGLESTEP" : "PTRACE_CONT",
|
target_pid_to_str (lp->ptid),
|
target_pid_to_str (lp->ptid),
|
signo ? strsignal (signo) : "0");
|
signo ? strsignal (signo) : "0");
|
lp->stopped = 0;
|
lp->stopped = 0;
|
status = 0;
|
status = 0;
|
goto retry;
|
goto retry;
|
}
|
}
|
|
|
if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0)
|
if (signo == TARGET_SIGNAL_INT && signal_pass_state (signo) == 0)
|
{
|
{
|
/* If ^C/BREAK is typed at the tty/console, SIGINT gets
|
/* If ^C/BREAK is typed at the tty/console, SIGINT gets
|
forwarded to the entire process group, that is, all LWP's
|
forwarded to the entire process group, that is, all LWP's
|
will receive it. Since we only want to report it once,
|
will receive it. Since we only want to report it once,
|
we try to flush it from all LWPs except this one. */
|
we try to flush it from all LWPs except this one. */
|
sigaddset (&flush_mask, SIGINT);
|
sigaddset (&flush_mask, SIGINT);
|
}
|
}
|
}
|
}
|
|
|
/* This LWP is stopped now. */
|
/* This LWP is stopped now. */
|
lp->stopped = 1;
|
lp->stopped = 1;
|
|
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n",
|
fprintf_unfiltered (gdb_stdlog, "LLW: Candidate event %s in %s.\n",
|
status_to_str (status), target_pid_to_str (lp->ptid));
|
status_to_str (status), target_pid_to_str (lp->ptid));
|
|
|
/* Now stop all other LWP's ... */
|
/* Now stop all other LWP's ... */
|
iterate_over_lwps (stop_callback, NULL);
|
iterate_over_lwps (stop_callback, NULL);
|
|
|
/* ... and wait until all of them have reported back that they're no
|
/* ... and wait until all of them have reported back that they're no
|
longer running. */
|
longer running. */
|
iterate_over_lwps (stop_wait_callback, &flush_mask);
|
iterate_over_lwps (stop_wait_callback, &flush_mask);
|
iterate_over_lwps (flush_callback, &flush_mask);
|
iterate_over_lwps (flush_callback, &flush_mask);
|
|
|
/* If we're not waiting for a specific LWP, choose an event LWP from
|
/* If we're not waiting for a specific LWP, choose an event LWP from
|
among those that have had events. Giving equal priority to all
|
among those that have had events. Giving equal priority to all
|
LWPs that have had events helps prevent starvation. */
|
LWPs that have had events helps prevent starvation. */
|
if (pid == -1)
|
if (pid == -1)
|
select_event_lwp (&lp, &status);
|
select_event_lwp (&lp, &status);
|
|
|
/* Now that we've selected our final event LWP, cancel any
|
/* Now that we've selected our final event LWP, cancel any
|
breakpoints in other LWPs that have hit a GDB breakpoint. See
|
breakpoints in other LWPs that have hit a GDB breakpoint. See
|
the comment in cancel_breakpoints_callback to find out why. */
|
the comment in cancel_breakpoints_callback to find out why. */
|
iterate_over_lwps (cancel_breakpoints_callback, lp);
|
iterate_over_lwps (cancel_breakpoints_callback, lp);
|
|
|
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP)
|
if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP)
|
{
|
{
|
trap_ptid = lp->ptid;
|
trap_ptid = lp->ptid;
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLW: trap_ptid is %s.\n",
|
"LLW: trap_ptid is %s.\n",
|
target_pid_to_str (trap_ptid));
|
target_pid_to_str (trap_ptid));
|
}
|
}
|
else
|
else
|
trap_ptid = null_ptid;
|
trap_ptid = null_ptid;
|
|
|
if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE)
|
if (lp->waitstatus.kind != TARGET_WAITKIND_IGNORE)
|
{
|
{
|
*ourstatus = lp->waitstatus;
|
*ourstatus = lp->waitstatus;
|
lp->waitstatus.kind = TARGET_WAITKIND_IGNORE;
|
lp->waitstatus.kind = TARGET_WAITKIND_IGNORE;
|
}
|
}
|
else
|
else
|
store_waitstatus (ourstatus, status);
|
store_waitstatus (ourstatus, status);
|
|
|
return lp->ptid;
|
return lp->ptid;
|
}
|
}
|
|
|
static int
|
static int
|
kill_callback (struct lwp_info *lp, void *data)
|
kill_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
errno = 0;
|
errno = 0;
|
ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0);
|
ptrace (PTRACE_KILL, GET_LWP (lp->ptid), 0, 0);
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"KC: PTRACE_KILL %s, 0, 0 (%s)\n",
|
"KC: PTRACE_KILL %s, 0, 0 (%s)\n",
|
target_pid_to_str (lp->ptid),
|
target_pid_to_str (lp->ptid),
|
errno ? safe_strerror (errno) : "OK");
|
errno ? safe_strerror (errno) : "OK");
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static int
|
static int
|
kill_wait_callback (struct lwp_info *lp, void *data)
|
kill_wait_callback (struct lwp_info *lp, void *data)
|
{
|
{
|
pid_t pid;
|
pid_t pid;
|
|
|
/* We must make sure that there are no pending events (delayed
|
/* We must make sure that there are no pending events (delayed
|
SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current
|
SIGSTOPs, pending SIGTRAPs, etc.) to make sure the current
|
program doesn't interfere with any following debugging session. */
|
program doesn't interfere with any following debugging session. */
|
|
|
/* For cloned processes we must check both with __WCLONE and
|
/* For cloned processes we must check both with __WCLONE and
|
without, since the exit status of a cloned process isn't reported
|
without, since the exit status of a cloned process isn't reported
|
with __WCLONE. */
|
with __WCLONE. */
|
if (lp->cloned)
|
if (lp->cloned)
|
{
|
{
|
do
|
do
|
{
|
{
|
pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE);
|
pid = my_waitpid (GET_LWP (lp->ptid), NULL, __WCLONE);
|
if (pid != (pid_t) -1)
|
if (pid != (pid_t) -1)
|
{
|
{
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"KWC: wait %s received unknown.\n",
|
"KWC: wait %s received unknown.\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
/* The Linux kernel sometimes fails to kill a thread
|
/* The Linux kernel sometimes fails to kill a thread
|
completely after PTRACE_KILL; that goes from the stop
|
completely after PTRACE_KILL; that goes from the stop
|
point in do_fork out to the one in
|
point in do_fork out to the one in
|
get_signal_to_deliever and waits again. So kill it
|
get_signal_to_deliever and waits again. So kill it
|
again. */
|
again. */
|
kill_callback (lp, NULL);
|
kill_callback (lp, NULL);
|
}
|
}
|
}
|
}
|
while (pid == GET_LWP (lp->ptid));
|
while (pid == GET_LWP (lp->ptid));
|
|
|
gdb_assert (pid == -1 && errno == ECHILD);
|
gdb_assert (pid == -1 && errno == ECHILD);
|
}
|
}
|
|
|
do
|
do
|
{
|
{
|
pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0);
|
pid = my_waitpid (GET_LWP (lp->ptid), NULL, 0);
|
if (pid != (pid_t) -1)
|
if (pid != (pid_t) -1)
|
{
|
{
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"KWC: wait %s received unk.\n",
|
"KWC: wait %s received unk.\n",
|
target_pid_to_str (lp->ptid));
|
target_pid_to_str (lp->ptid));
|
/* See the call to kill_callback above. */
|
/* See the call to kill_callback above. */
|
kill_callback (lp, NULL);
|
kill_callback (lp, NULL);
|
}
|
}
|
}
|
}
|
while (pid == GET_LWP (lp->ptid));
|
while (pid == GET_LWP (lp->ptid));
|
|
|
gdb_assert (pid == -1 && errno == ECHILD);
|
gdb_assert (pid == -1 && errno == ECHILD);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void
|
static void
|
linux_nat_kill (void)
|
linux_nat_kill (void)
|
{
|
{
|
struct target_waitstatus last;
|
struct target_waitstatus last;
|
ptid_t last_ptid;
|
ptid_t last_ptid;
|
int status;
|
int status;
|
|
|
/* If we're stopped while forking and we haven't followed yet,
|
/* If we're stopped while forking and we haven't followed yet,
|
kill the other task. We need to do this first because the
|
kill the other task. We need to do this first because the
|
parent will be sleeping if this is a vfork. */
|
parent will be sleeping if this is a vfork. */
|
|
|
get_last_target_status (&last_ptid, &last);
|
get_last_target_status (&last_ptid, &last);
|
|
|
if (last.kind == TARGET_WAITKIND_FORKED
|
if (last.kind == TARGET_WAITKIND_FORKED
|
|| last.kind == TARGET_WAITKIND_VFORKED)
|
|| last.kind == TARGET_WAITKIND_VFORKED)
|
{
|
{
|
ptrace (PT_KILL, last.value.related_pid, 0, 0);
|
ptrace (PT_KILL, last.value.related_pid, 0, 0);
|
wait (&status);
|
wait (&status);
|
}
|
}
|
|
|
if (forks_exist_p ())
|
if (forks_exist_p ())
|
linux_fork_killall ();
|
linux_fork_killall ();
|
else
|
else
|
{
|
{
|
/* Kill all LWP's ... */
|
/* Kill all LWP's ... */
|
iterate_over_lwps (kill_callback, NULL);
|
iterate_over_lwps (kill_callback, NULL);
|
|
|
/* ... and wait until we've flushed all events. */
|
/* ... and wait until we've flushed all events. */
|
iterate_over_lwps (kill_wait_callback, NULL);
|
iterate_over_lwps (kill_wait_callback, NULL);
|
}
|
}
|
|
|
target_mourn_inferior ();
|
target_mourn_inferior ();
|
}
|
}
|
|
|
static void
|
static void
|
linux_nat_mourn_inferior (void)
|
linux_nat_mourn_inferior (void)
|
{
|
{
|
trap_ptid = null_ptid;
|
trap_ptid = null_ptid;
|
|
|
/* Destroy LWP info; it's no longer valid. */
|
/* Destroy LWP info; it's no longer valid. */
|
init_lwp_list ();
|
init_lwp_list ();
|
|
|
/* Restore the original signal mask. */
|
/* Restore the original signal mask. */
|
sigprocmask (SIG_SETMASK, &normal_mask, NULL);
|
sigprocmask (SIG_SETMASK, &normal_mask, NULL);
|
sigemptyset (&blocked_mask);
|
sigemptyset (&blocked_mask);
|
|
|
if (! forks_exist_p ())
|
if (! forks_exist_p ())
|
/* Normal case, no other forks available. */
|
/* Normal case, no other forks available. */
|
linux_ops->to_mourn_inferior ();
|
linux_ops->to_mourn_inferior ();
|
else
|
else
|
/* Multi-fork case. The current inferior_ptid has exited, but
|
/* Multi-fork case. The current inferior_ptid has exited, but
|
there are other viable forks to debug. Delete the exiting
|
there are other viable forks to debug. Delete the exiting
|
one and context-switch to the first available. */
|
one and context-switch to the first available. */
|
linux_fork_mourn_inferior ();
|
linux_fork_mourn_inferior ();
|
}
|
}
|
|
|
static LONGEST
|
static LONGEST
|
linux_nat_xfer_partial (struct target_ops *ops, enum target_object object,
|
linux_nat_xfer_partial (struct target_ops *ops, enum target_object object,
|
const char *annex, gdb_byte *readbuf,
|
const char *annex, gdb_byte *readbuf,
|
const gdb_byte *writebuf,
|
const gdb_byte *writebuf,
|
ULONGEST offset, LONGEST len)
|
ULONGEST offset, LONGEST len)
|
{
|
{
|
struct cleanup *old_chain = save_inferior_ptid ();
|
struct cleanup *old_chain = save_inferior_ptid ();
|
LONGEST xfer;
|
LONGEST xfer;
|
|
|
if (is_lwp (inferior_ptid))
|
if (is_lwp (inferior_ptid))
|
inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid));
|
inferior_ptid = pid_to_ptid (GET_LWP (inferior_ptid));
|
|
|
xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf,
|
xfer = linux_ops->to_xfer_partial (ops, object, annex, readbuf, writebuf,
|
offset, len);
|
offset, len);
|
|
|
do_cleanups (old_chain);
|
do_cleanups (old_chain);
|
return xfer;
|
return xfer;
|
}
|
}
|
|
|
static int
|
static int
|
linux_nat_thread_alive (ptid_t ptid)
|
linux_nat_thread_alive (ptid_t ptid)
|
{
|
{
|
gdb_assert (is_lwp (ptid));
|
gdb_assert (is_lwp (ptid));
|
|
|
errno = 0;
|
errno = 0;
|
ptrace (PTRACE_PEEKUSER, GET_LWP (ptid), 0, 0);
|
ptrace (PTRACE_PEEKUSER, GET_LWP (ptid), 0, 0);
|
if (debug_linux_nat)
|
if (debug_linux_nat)
|
fprintf_unfiltered (gdb_stdlog,
|
fprintf_unfiltered (gdb_stdlog,
|
"LLTA: PTRACE_PEEKUSER %s, 0, 0 (%s)\n",
|
"LLTA: PTRACE_PEEKUSER %s, 0, 0 (%s)\n",
|
target_pid_to_str (ptid),
|
target_pid_to_str (ptid),
|
errno ? safe_strerror (errno) : "OK");
|
errno ? safe_strerror (errno) : "OK");
|
|
|
/* Not every Linux kernel implements PTRACE_PEEKUSER. But we can
|
/* Not every Linux kernel implements PTRACE_PEEKUSER. But we can
|
handle that case gracefully since ptrace will first do a lookup
|
handle that case gracefully since ptrace will first do a lookup
|
for the process based upon the passed-in pid. If that fails we
|
for the process based upon the passed-in pid. If that fails we
|
will get either -ESRCH or -EPERM, otherwise the child exists and
|
will get either -ESRCH or -EPERM, otherwise the child exists and
|
is alive. */
|
is alive. */
|
if (errno == ESRCH || errno == EPERM)
|
if (errno == ESRCH || errno == EPERM)
|
return 0;
|
return 0;
|
|
|
return 1;
|
return 1;
|
}
|
}
|
|
|
static char *
|
static char *
|
linux_nat_pid_to_str (ptid_t ptid)
|
linux_nat_pid_to_str (ptid_t ptid)
|
{
|
{
|
static char buf[64];
|
static char buf[64];
|
|
|
if (lwp_list && lwp_list->next && is_lwp (ptid))
|
if (lwp_list && lwp_list->next && is_lwp (ptid))
|
{
|
{
|
snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid));
|
snprintf (buf, sizeof (buf), "LWP %ld", GET_LWP (ptid));
|
return buf;
|
return buf;
|
}
|
}
|
|
|
return normal_pid_to_str (ptid);
|
return normal_pid_to_str (ptid);
|
}
|
}
|
|
|
static void
|
static void
|
sigchld_handler (int signo)
|
sigchld_handler (int signo)
|
{
|
{
|
/* Do nothing. The only reason for this handler is that it allows
|
/* Do nothing. The only reason for this handler is that it allows
|
us to use sigsuspend in linux_nat_wait above to wait for the
|
us to use sigsuspend in linux_nat_wait above to wait for the
|
arrival of a SIGCHLD. */
|
arrival of a SIGCHLD. */
|
}
|
}
|
|
|
/* Accepts an integer PID; Returns a string representing a file that
|
/* Accepts an integer PID; Returns a string representing a file that
|
can be opened to get the symbols for the child process. */
|
can be opened to get the symbols for the child process. */
|
|
|
static char *
|
static char *
|
linux_child_pid_to_exec_file (int pid)
|
linux_child_pid_to_exec_file (int pid)
|
{
|
{
|
char *name1, *name2;
|
char *name1, *name2;
|
|
|
name1 = xmalloc (MAXPATHLEN);
|
name1 = xmalloc (MAXPATHLEN);
|
name2 = xmalloc (MAXPATHLEN);
|
name2 = xmalloc (MAXPATHLEN);
|
make_cleanup (xfree, name1);
|
make_cleanup (xfree, name1);
|
make_cleanup (xfree, name2);
|
make_cleanup (xfree, name2);
|
memset (name2, 0, MAXPATHLEN);
|
memset (name2, 0, MAXPATHLEN);
|
|
|
sprintf (name1, "/proc/%d/exe", pid);
|
sprintf (name1, "/proc/%d/exe", pid);
|
if (readlink (name1, name2, MAXPATHLEN) > 0)
|
if (readlink (name1, name2, MAXPATHLEN) > 0)
|
return name2;
|
return name2;
|
else
|
else
|
return name1;
|
return name1;
|
}
|
}
|
|
|
/* Service function for corefiles and info proc. */
|
/* Service function for corefiles and info proc. */
|
|
|
static int
|
static int
|
read_mapping (FILE *mapfile,
|
read_mapping (FILE *mapfile,
|
long long *addr,
|
long long *addr,
|
long long *endaddr,
|
long long *endaddr,
|
char *permissions,
|
char *permissions,
|
long long *offset,
|
long long *offset,
|
char *device, long long *inode, char *filename)
|
char *device, long long *inode, char *filename)
|
{
|
{
|
int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx",
|
int ret = fscanf (mapfile, "%llx-%llx %s %llx %s %llx",
|
addr, endaddr, permissions, offset, device, inode);
|
addr, endaddr, permissions, offset, device, inode);
|
|
|
filename[0] = '\0';
|
filename[0] = '\0';
|
if (ret > 0 && ret != EOF)
|
if (ret > 0 && ret != EOF)
|
{
|
{
|
/* Eat everything up to EOL for the filename. This will prevent
|
/* Eat everything up to EOL for the filename. This will prevent
|
weird filenames (such as one with embedded whitespace) from
|
weird filenames (such as one with embedded whitespace) from
|
confusing this code. It also makes this code more robust in
|
confusing this code. It also makes this code more robust in
|
respect to annotations the kernel may add after the filename.
|
respect to annotations the kernel may add after the filename.
|
|
|
Note the filename is used for informational purposes
|
Note the filename is used for informational purposes
|
only. */
|
only. */
|
ret += fscanf (mapfile, "%[^\n]\n", filename);
|
ret += fscanf (mapfile, "%[^\n]\n", filename);
|
}
|
}
|
|
|
return (ret != 0 && ret != EOF);
|
return (ret != 0 && ret != EOF);
|
}
|
}
|
|
|
/* Fills the "to_find_memory_regions" target vector. Lists the memory
|
/* Fills the "to_find_memory_regions" target vector. Lists the memory
|
regions in the inferior for a corefile. */
|
regions in the inferior for a corefile. */
|
|
|
static int
|
static int
|
linux_nat_find_memory_regions (int (*func) (CORE_ADDR,
|
linux_nat_find_memory_regions (int (*func) (CORE_ADDR,
|
unsigned long,
|
unsigned long,
|
int, int, int, void *), void *obfd)
|
int, int, int, void *), void *obfd)
|
{
|
{
|
long long pid = PIDGET (inferior_ptid);
|
long long pid = PIDGET (inferior_ptid);
|
char mapsfilename[MAXPATHLEN];
|
char mapsfilename[MAXPATHLEN];
|
FILE *mapsfile;
|
FILE *mapsfile;
|
long long addr, endaddr, size, offset, inode;
|
long long addr, endaddr, size, offset, inode;
|
char permissions[8], device[8], filename[MAXPATHLEN];
|
char permissions[8], device[8], filename[MAXPATHLEN];
|
int read, write, exec;
|
int read, write, exec;
|
int ret;
|
int ret;
|
|
|
/* Compose the filename for the /proc memory map, and open it. */
|
/* Compose the filename for the /proc memory map, and open it. */
|
sprintf (mapsfilename, "/proc/%lld/maps", pid);
|
sprintf (mapsfilename, "/proc/%lld/maps", pid);
|
if ((mapsfile = fopen (mapsfilename, "r")) == NULL)
|
if ((mapsfile = fopen (mapsfilename, "r")) == NULL)
|
error (_("Could not open %s."), mapsfilename);
|
error (_("Could not open %s."), mapsfilename);
|
|
|
if (info_verbose)
|
if (info_verbose)
|
fprintf_filtered (gdb_stdout,
|
fprintf_filtered (gdb_stdout,
|
"Reading memory regions from %s\n", mapsfilename);
|
"Reading memory regions from %s\n", mapsfilename);
|
|
|
/* Now iterate until end-of-file. */
|
/* Now iterate until end-of-file. */
|
while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0],
|
while (read_mapping (mapsfile, &addr, &endaddr, &permissions[0],
|
&offset, &device[0], &inode, &filename[0]))
|
&offset, &device[0], &inode, &filename[0]))
|
{
|
{
|
size = endaddr - addr;
|
size = endaddr - addr;
|
|
|
/* Get the segment's permissions. */
|
/* Get the segment's permissions. */
|
read = (strchr (permissions, 'r') != 0);
|
read = (strchr (permissions, 'r') != 0);
|
write = (strchr (permissions, 'w') != 0);
|
write = (strchr (permissions, 'w') != 0);
|
exec = (strchr (permissions, 'x') != 0);
|
exec = (strchr (permissions, 'x') != 0);
|
|
|
if (info_verbose)
|
if (info_verbose)
|
{
|
{
|
fprintf_filtered (gdb_stdout,
|
fprintf_filtered (gdb_stdout,
|
"Save segment, %lld bytes at 0x%s (%c%c%c)",
|
"Save segment, %lld bytes at 0x%s (%c%c%c)",
|
size, paddr_nz (addr),
|
size, paddr_nz (addr),
|
read ? 'r' : ' ',
|
read ? 'r' : ' ',
|
write ? 'w' : ' ', exec ? 'x' : ' ');
|
write ? 'w' : ' ', exec ? 'x' : ' ');
|
if (filename[0])
|
if (filename[0])
|
fprintf_filtered (gdb_stdout, " for %s", filename);
|
fprintf_filtered (gdb_stdout, " for %s", filename);
|
fprintf_filtered (gdb_stdout, "\n");
|
fprintf_filtered (gdb_stdout, "\n");
|
}
|
}
|
|
|
/* Invoke the callback function to create the corefile
|
/* Invoke the callback function to create the corefile
|
segment. */
|
segment. */
|
func (addr, size, read, write, exec, obfd);
|
func (addr, size, read, write, exec, obfd);
|
}
|
}
|
fclose (mapsfile);
|
fclose (mapsfile);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Records the thread's register state for the corefile note
|
/* Records the thread's register state for the corefile note
|
section. */
|
section. */
|
|
|
static char *
|
static char *
|
linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid,
|
linux_nat_do_thread_registers (bfd *obfd, ptid_t ptid,
|
char *note_data, int *note_size)
|
char *note_data, int *note_size)
|
{
|
{
|
gdb_gregset_t gregs;
|
gdb_gregset_t gregs;
|
gdb_fpregset_t fpregs;
|
gdb_fpregset_t fpregs;
|
#ifdef FILL_FPXREGSET
|
#ifdef FILL_FPXREGSET
|
gdb_fpxregset_t fpxregs;
|
gdb_fpxregset_t fpxregs;
|
#endif
|
#endif
|
unsigned long lwp = ptid_get_lwp (ptid);
|
unsigned long lwp = ptid_get_lwp (ptid);
|
struct regcache *regcache = get_thread_regcache (ptid);
|
struct regcache *regcache = get_thread_regcache (ptid);
|
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
const struct regset *regset;
|
const struct regset *regset;
|
int core_regset_p;
|
int core_regset_p;
|
struct cleanup *old_chain;
|
struct cleanup *old_chain;
|
|
|
old_chain = save_inferior_ptid ();
|
old_chain = save_inferior_ptid ();
|
inferior_ptid = ptid;
|
inferior_ptid = ptid;
|
target_fetch_registers (regcache, -1);
|
target_fetch_registers (regcache, -1);
|
do_cleanups (old_chain);
|
do_cleanups (old_chain);
|
|
|
core_regset_p = gdbarch_regset_from_core_section_p (gdbarch);
|
core_regset_p = gdbarch_regset_from_core_section_p (gdbarch);
|
if (core_regset_p
|
if (core_regset_p
|
&& (regset = gdbarch_regset_from_core_section (gdbarch, ".reg",
|
&& (regset = gdbarch_regset_from_core_section (gdbarch, ".reg",
|
sizeof (gregs))) != NULL
|
sizeof (gregs))) != NULL
|
&& regset->collect_regset != NULL)
|
&& regset->collect_regset != NULL)
|
regset->collect_regset (regset, regcache, -1,
|
regset->collect_regset (regset, regcache, -1,
|
&gregs, sizeof (gregs));
|
&gregs, sizeof (gregs));
|
else
|
else
|
fill_gregset (regcache, &gregs, -1);
|
fill_gregset (regcache, &gregs, -1);
|
|
|
note_data = (char *) elfcore_write_prstatus (obfd,
|
note_data = (char *) elfcore_write_prstatus (obfd,
|
note_data,
|
note_data,
|
note_size,
|
note_size,
|
lwp,
|
lwp,
|
stop_signal, &gregs);
|
stop_signal, &gregs);
|
|
|
if (core_regset_p
|
if (core_regset_p
|
&& (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2",
|
&& (regset = gdbarch_regset_from_core_section (gdbarch, ".reg2",
|
sizeof (fpregs))) != NULL
|
sizeof (fpregs))) != NULL
|
&& regset->collect_regset != NULL)
|
&& regset->collect_regset != NULL)
|
regset->collect_regset (regset, regcache, -1,
|
regset->collect_regset (regset, regcache, -1,
|
&fpregs, sizeof (fpregs));
|
&fpregs, sizeof (fpregs));
|
else
|
else
|
fill_fpregset (regcache, &fpregs, -1);
|
fill_fpregset (regcache, &fpregs, -1);
|
|
|
note_data = (char *) elfcore_write_prfpreg (obfd,
|
note_data = (char *) elfcore_write_prfpreg (obfd,
|
note_data,
|
note_data,
|
note_size,
|
note_size,
|
&fpregs, sizeof (fpregs));
|
&fpregs, sizeof (fpregs));
|
|
|
#ifdef FILL_FPXREGSET
|
#ifdef FILL_FPXREGSET
|
if (core_regset_p
|
if (core_regset_p
|
&& (regset = gdbarch_regset_from_core_section (gdbarch, ".reg-xfp",
|
&& (regset = gdbarch_regset_from_core_section (gdbarch, ".reg-xfp",
|
sizeof (fpxregs))) != NULL
|
sizeof (fpxregs))) != NULL
|
&& regset->collect_regset != NULL)
|
&& regset->collect_regset != NULL)
|
regset->collect_regset (regset, regcache, -1,
|
regset->collect_regset (regset, regcache, -1,
|
&fpxregs, sizeof (fpxregs));
|
&fpxregs, sizeof (fpxregs));
|
else
|
else
|
fill_fpxregset (regcache, &fpxregs, -1);
|
fill_fpxregset (regcache, &fpxregs, -1);
|
|
|
note_data = (char *) elfcore_write_prxfpreg (obfd,
|
note_data = (char *) elfcore_write_prxfpreg (obfd,
|
note_data,
|
note_data,
|
note_size,
|
note_size,
|
&fpxregs, sizeof (fpxregs));
|
&fpxregs, sizeof (fpxregs));
|
#endif
|
#endif
|
return note_data;
|
return note_data;
|
}
|
}
|
|
|
struct linux_nat_corefile_thread_data
|
struct linux_nat_corefile_thread_data
|
{
|
{
|
bfd *obfd;
|
bfd *obfd;
|
char *note_data;
|
char *note_data;
|
int *note_size;
|
int *note_size;
|
int num_notes;
|
int num_notes;
|
};
|
};
|
|
|
/* Called by gdbthread.c once per thread. Records the thread's
|
/* Called by gdbthread.c once per thread. Records the thread's
|
register state for the corefile note section. */
|
register state for the corefile note section. */
|
|
|
static int
|
static int
|
linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data)
|
linux_nat_corefile_thread_callback (struct lwp_info *ti, void *data)
|
{
|
{
|
struct linux_nat_corefile_thread_data *args = data;
|
struct linux_nat_corefile_thread_data *args = data;
|
|
|
args->note_data = linux_nat_do_thread_registers (args->obfd,
|
args->note_data = linux_nat_do_thread_registers (args->obfd,
|
ti->ptid,
|
ti->ptid,
|
args->note_data,
|
args->note_data,
|
args->note_size);
|
args->note_size);
|
args->num_notes++;
|
args->num_notes++;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Records the register state for the corefile note section. */
|
/* Records the register state for the corefile note section. */
|
|
|
static char *
|
static char *
|
linux_nat_do_registers (bfd *obfd, ptid_t ptid,
|
linux_nat_do_registers (bfd *obfd, ptid_t ptid,
|
char *note_data, int *note_size)
|
char *note_data, int *note_size)
|
{
|
{
|
return linux_nat_do_thread_registers (obfd,
|
return linux_nat_do_thread_registers (obfd,
|
ptid_build (ptid_get_pid (inferior_ptid),
|
ptid_build (ptid_get_pid (inferior_ptid),
|
ptid_get_pid (inferior_ptid),
|
ptid_get_pid (inferior_ptid),
|
0),
|
0),
|
note_data, note_size);
|
note_data, note_size);
|
}
|
}
|
|
|
/* Fills the "to_make_corefile_note" target vector. Builds the note
|
/* Fills the "to_make_corefile_note" target vector. Builds the note
|
section for a corefile, and returns it in a malloc buffer. */
|
section for a corefile, and returns it in a malloc buffer. */
|
|
|
static char *
|
static char *
|
linux_nat_make_corefile_notes (bfd *obfd, int *note_size)
|
linux_nat_make_corefile_notes (bfd *obfd, int *note_size)
|
{
|
{
|
struct linux_nat_corefile_thread_data thread_args;
|
struct linux_nat_corefile_thread_data thread_args;
|
struct cleanup *old_chain;
|
struct cleanup *old_chain;
|
/* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */
|
/* The variable size must be >= sizeof (prpsinfo_t.pr_fname). */
|
char fname[16] = { '\0' };
|
char fname[16] = { '\0' };
|
/* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */
|
/* The variable size must be >= sizeof (prpsinfo_t.pr_psargs). */
|
char psargs[80] = { '\0' };
|
char psargs[80] = { '\0' };
|
char *note_data = NULL;
|
char *note_data = NULL;
|
ptid_t current_ptid = inferior_ptid;
|
ptid_t current_ptid = inferior_ptid;
|
gdb_byte *auxv;
|
gdb_byte *auxv;
|
int auxv_len;
|
int auxv_len;
|
|
|
if (get_exec_file (0))
|
if (get_exec_file (0))
|
{
|
{
|
strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname));
|
strncpy (fname, strrchr (get_exec_file (0), '/') + 1, sizeof (fname));
|
strncpy (psargs, get_exec_file (0), sizeof (psargs));
|
strncpy (psargs, get_exec_file (0), sizeof (psargs));
|
if (get_inferior_args ())
|
if (get_inferior_args ())
|
{
|
{
|
char *string_end;
|
char *string_end;
|
char *psargs_end = psargs + sizeof (psargs);
|
char *psargs_end = psargs + sizeof (psargs);
|
|
|
/* linux_elfcore_write_prpsinfo () handles zero unterminated
|
/* linux_elfcore_write_prpsinfo () handles zero unterminated
|
strings fine. */
|
strings fine. */
|
string_end = memchr (psargs, 0, sizeof (psargs));
|
string_end = memchr (psargs, 0, sizeof (psargs));
|
if (string_end != NULL)
|
if (string_end != NULL)
|
{
|
{
|
*string_end++ = ' ';
|
*string_end++ = ' ';
|
strncpy (string_end, get_inferior_args (),
|
strncpy (string_end, get_inferior_args (),
|
psargs_end - string_end);
|
psargs_end - string_end);
|
}
|
}
|
}
|
}
|
note_data = (char *) elfcore_write_prpsinfo (obfd,
|
note_data = (char *) elfcore_write_prpsinfo (obfd,
|
note_data,
|
note_data,
|
note_size, fname, psargs);
|
note_size, fname, psargs);
|
}
|
}
|
|
|
/* Dump information for threads. */
|
/* Dump information for threads. */
|
thread_args.obfd = obfd;
|
thread_args.obfd = obfd;
|
thread_args.note_data = note_data;
|
thread_args.note_data = note_data;
|
thread_args.note_size = note_size;
|
thread_args.note_size = note_size;
|
thread_args.num_notes = 0;
|
thread_args.num_notes = 0;
|
iterate_over_lwps (linux_nat_corefile_thread_callback, &thread_args);
|
iterate_over_lwps (linux_nat_corefile_thread_callback, &thread_args);
|
if (thread_args.num_notes == 0)
|
if (thread_args.num_notes == 0)
|
{
|
{
|
/* iterate_over_threads didn't come up with any threads; just
|
/* iterate_over_threads didn't come up with any threads; just
|
use inferior_ptid. */
|
use inferior_ptid. */
|
note_data = linux_nat_do_registers (obfd, inferior_ptid,
|
note_data = linux_nat_do_registers (obfd, inferior_ptid,
|
note_data, note_size);
|
note_data, note_size);
|
}
|
}
|
else
|
else
|
{
|
{
|
note_data = thread_args.note_data;
|
note_data = thread_args.note_data;
|
}
|
}
|
|
|
auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV,
|
auxv_len = target_read_alloc (¤t_target, TARGET_OBJECT_AUXV,
|
NULL, &auxv);
|
NULL, &auxv);
|
if (auxv_len > 0)
|
if (auxv_len > 0)
|
{
|
{
|
note_data = elfcore_write_note (obfd, note_data, note_size,
|
note_data = elfcore_write_note (obfd, note_data, note_size,
|
"CORE", NT_AUXV, auxv, auxv_len);
|
"CORE", NT_AUXV, auxv, auxv_len);
|
xfree (auxv);
|
xfree (auxv);
|
}
|
}
|
|
|
make_cleanup (xfree, note_data);
|
make_cleanup (xfree, note_data);
|
return note_data;
|
return note_data;
|
}
|
}
|
|
|
/* Implement the "info proc" command. */
|
/* Implement the "info proc" command. */
|
|
|
static void
|
static void
|
linux_nat_info_proc_cmd (char *args, int from_tty)
|
linux_nat_info_proc_cmd (char *args, int from_tty)
|
{
|
{
|
long long pid = PIDGET (inferior_ptid);
|
long long pid = PIDGET (inferior_ptid);
|
FILE *procfile;
|
FILE *procfile;
|
char **argv = NULL;
|
char **argv = NULL;
|
char buffer[MAXPATHLEN];
|
char buffer[MAXPATHLEN];
|
char fname1[MAXPATHLEN], fname2[MAXPATHLEN];
|
char fname1[MAXPATHLEN], fname2[MAXPATHLEN];
|
int cmdline_f = 1;
|
int cmdline_f = 1;
|
int cwd_f = 1;
|
int cwd_f = 1;
|
int exe_f = 1;
|
int exe_f = 1;
|
int mappings_f = 0;
|
int mappings_f = 0;
|
int environ_f = 0;
|
int environ_f = 0;
|
int status_f = 0;
|
int status_f = 0;
|
int stat_f = 0;
|
int stat_f = 0;
|
int all = 0;
|
int all = 0;
|
struct stat dummy;
|
struct stat dummy;
|
|
|
if (args)
|
if (args)
|
{
|
{
|
/* Break up 'args' into an argv array. */
|
/* Break up 'args' into an argv array. */
|
if ((argv = buildargv (args)) == NULL)
|
if ((argv = buildargv (args)) == NULL)
|
nomem (0);
|
nomem (0);
|
else
|
else
|
make_cleanup_freeargv (argv);
|
make_cleanup_freeargv (argv);
|
}
|
}
|
while (argv != NULL && *argv != NULL)
|
while (argv != NULL && *argv != NULL)
|
{
|
{
|
if (isdigit (argv[0][0]))
|
if (isdigit (argv[0][0]))
|
{
|
{
|
pid = strtoul (argv[0], NULL, 10);
|
pid = strtoul (argv[0], NULL, 10);
|
}
|
}
|
else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0)
|
else if (strncmp (argv[0], "mappings", strlen (argv[0])) == 0)
|
{
|
{
|
mappings_f = 1;
|
mappings_f = 1;
|
}
|
}
|
else if (strcmp (argv[0], "status") == 0)
|
else if (strcmp (argv[0], "status") == 0)
|
{
|
{
|
status_f = 1;
|
status_f = 1;
|
}
|
}
|
else if (strcmp (argv[0], "stat") == 0)
|
else if (strcmp (argv[0], "stat") == 0)
|
{
|
{
|
stat_f = 1;
|
stat_f = 1;
|
}
|
}
|
else if (strcmp (argv[0], "cmd") == 0)
|
else if (strcmp (argv[0], "cmd") == 0)
|
{
|
{
|
cmdline_f = 1;
|
cmdline_f = 1;
|
}
|
}
|
else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0)
|
else if (strncmp (argv[0], "exe", strlen (argv[0])) == 0)
|
{
|
{
|
exe_f = 1;
|
exe_f = 1;
|
}
|
}
|
else if (strcmp (argv[0], "cwd") == 0)
|
else if (strcmp (argv[0], "cwd") == 0)
|
{
|
{
|
cwd_f = 1;
|
cwd_f = 1;
|
}
|
}
|
else if (strncmp (argv[0], "all", strlen (argv[0])) == 0)
|
else if (strncmp (argv[0], "all", strlen (argv[0])) == 0)
|
{
|
{
|
all = 1;
|
all = 1;
|
}
|
}
|
else
|
else
|
{
|
{
|
/* [...] (future options here) */
|
/* [...] (future options here) */
|
}
|
}
|
argv++;
|
argv++;
|
}
|
}
|
if (pid == 0)
|
if (pid == 0)
|
error (_("No current process: you must name one."));
|
error (_("No current process: you must name one."));
|
|
|
sprintf (fname1, "/proc/%lld", pid);
|
sprintf (fname1, "/proc/%lld", pid);
|
if (stat (fname1, &dummy) != 0)
|
if (stat (fname1, &dummy) != 0)
|
error (_("No /proc directory: '%s'"), fname1);
|
error (_("No /proc directory: '%s'"), fname1);
|
|
|
printf_filtered (_("process %lld\n"), pid);
|
printf_filtered (_("process %lld\n"), pid);
|
if (cmdline_f || all)
|
if (cmdline_f || all)
|
{
|
{
|
sprintf (fname1, "/proc/%lld/cmdline", pid);
|
sprintf (fname1, "/proc/%lld/cmdline", pid);
|
if ((procfile = fopen (fname1, "r")) != NULL)
|
if ((procfile = fopen (fname1, "r")) != NULL)
|
{
|
{
|
fgets (buffer, sizeof (buffer), procfile);
|
fgets (buffer, sizeof (buffer), procfile);
|
printf_filtered ("cmdline = '%s'\n", buffer);
|
printf_filtered ("cmdline = '%s'\n", buffer);
|
fclose (procfile);
|
fclose (procfile);
|
}
|
}
|
else
|
else
|
warning (_("unable to open /proc file '%s'"), fname1);
|
warning (_("unable to open /proc file '%s'"), fname1);
|
}
|
}
|
if (cwd_f || all)
|
if (cwd_f || all)
|
{
|
{
|
sprintf (fname1, "/proc/%lld/cwd", pid);
|
sprintf (fname1, "/proc/%lld/cwd", pid);
|
memset (fname2, 0, sizeof (fname2));
|
memset (fname2, 0, sizeof (fname2));
|
if (readlink (fname1, fname2, sizeof (fname2)) > 0)
|
if (readlink (fname1, fname2, sizeof (fname2)) > 0)
|
printf_filtered ("cwd = '%s'\n", fname2);
|
printf_filtered ("cwd = '%s'\n", fname2);
|
else
|
else
|
warning (_("unable to read link '%s'"), fname1);
|
warning (_("unable to read link '%s'"), fname1);
|
}
|
}
|
if (exe_f || all)
|
if (exe_f || all)
|
{
|
{
|
sprintf (fname1, "/proc/%lld/exe", pid);
|
sprintf (fname1, "/proc/%lld/exe", pid);
|
memset (fname2, 0, sizeof (fname2));
|
memset (fname2, 0, sizeof (fname2));
|
if (readlink (fname1, fname2, sizeof (fname2)) > 0)
|
if (readlink (fname1, fname2, sizeof (fname2)) > 0)
|
printf_filtered ("exe = '%s'\n", fname2);
|
printf_filtered ("exe = '%s'\n", fname2);
|
else
|
else
|
warning (_("unable to read link '%s'"), fname1);
|
warning (_("unable to read link '%s'"), fname1);
|
}
|
}
|
if (mappings_f || all)
|
if (mappings_f || all)
|
{
|
{
|
sprintf (fname1, "/proc/%lld/maps", pid);
|
sprintf (fname1, "/proc/%lld/maps", pid);
|
if ((procfile = fopen (fname1, "r")) != NULL)
|
if ((procfile = fopen (fname1, "r")) != NULL)
|
{
|
{
|
long long addr, endaddr, size, offset, inode;
|
long long addr, endaddr, size, offset, inode;
|
char permissions[8], device[8], filename[MAXPATHLEN];
|
char permissions[8], device[8], filename[MAXPATHLEN];
|
|
|
printf_filtered (_("Mapped address spaces:\n\n"));
|
printf_filtered (_("Mapped address spaces:\n\n"));
|
if (gdbarch_addr_bit (current_gdbarch) == 32)
|
if (gdbarch_addr_bit (current_gdbarch) == 32)
|
{
|
{
|
printf_filtered ("\t%10s %10s %10s %10s %7s\n",
|
printf_filtered ("\t%10s %10s %10s %10s %7s\n",
|
"Start Addr",
|
"Start Addr",
|
" End Addr",
|
" End Addr",
|
" Size", " Offset", "objfile");
|
" Size", " Offset", "objfile");
|
}
|
}
|
else
|
else
|
{
|
{
|
printf_filtered (" %18s %18s %10s %10s %7s\n",
|
printf_filtered (" %18s %18s %10s %10s %7s\n",
|
"Start Addr",
|
"Start Addr",
|
" End Addr",
|
" End Addr",
|
" Size", " Offset", "objfile");
|
" Size", " Offset", "objfile");
|
}
|
}
|
|
|
while (read_mapping (procfile, &addr, &endaddr, &permissions[0],
|
while (read_mapping (procfile, &addr, &endaddr, &permissions[0],
|
&offset, &device[0], &inode, &filename[0]))
|
&offset, &device[0], &inode, &filename[0]))
|
{
|
{
|
size = endaddr - addr;
|
size = endaddr - addr;
|
|
|
/* FIXME: carlton/2003-08-27: Maybe the printf_filtered
|
/* FIXME: carlton/2003-08-27: Maybe the printf_filtered
|
calls here (and possibly above) should be abstracted
|
calls here (and possibly above) should be abstracted
|
out into their own functions? Andrew suggests using
|
out into their own functions? Andrew suggests using
|
a generic local_address_string instead to print out
|
a generic local_address_string instead to print out
|
the addresses; that makes sense to me, too. */
|
the addresses; that makes sense to me, too. */
|
|
|
if (gdbarch_addr_bit (current_gdbarch) == 32)
|
if (gdbarch_addr_bit (current_gdbarch) == 32)
|
{
|
{
|
printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
|
printf_filtered ("\t%#10lx %#10lx %#10x %#10x %7s\n",
|
(unsigned long) addr, /* FIXME: pr_addr */
|
(unsigned long) addr, /* FIXME: pr_addr */
|
(unsigned long) endaddr,
|
(unsigned long) endaddr,
|
(int) size,
|
(int) size,
|
(unsigned int) offset,
|
(unsigned int) offset,
|
filename[0] ? filename : "");
|
filename[0] ? filename : "");
|
}
|
}
|
else
|
else
|
{
|
{
|
printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n",
|
printf_filtered (" %#18lx %#18lx %#10x %#10x %7s\n",
|
(unsigned long) addr, /* FIXME: pr_addr */
|
(unsigned long) addr, /* FIXME: pr_addr */
|
(unsigned long) endaddr,
|
(unsigned long) endaddr,
|
(int) size,
|
(int) size,
|
(unsigned int) offset,
|
(unsigned int) offset,
|
filename[0] ? filename : "");
|
filename[0] ? filename : "");
|
}
|
}
|
}
|
}
|
|
|
fclose (procfile);
|
fclose (procfile);
|
}
|
}
|
else
|
else
|
warning (_("unable to open /proc file '%s'"), fname1);
|
warning (_("unable to open /proc file '%s'"), fname1);
|
}
|
}
|
if (status_f || all)
|
if (status_f || all)
|
{
|
{
|
sprintf (fname1, "/proc/%lld/status", pid);
|
sprintf (fname1, "/proc/%lld/status", pid);
|
if ((procfile = fopen (fname1, "r")) != NULL)
|
if ((procfile = fopen (fname1, "r")) != NULL)
|
{
|
{
|
while (fgets (buffer, sizeof (buffer), procfile) != NULL)
|
while (fgets (buffer, sizeof (buffer), procfile) != NULL)
|
puts_filtered (buffer);
|
puts_filtered (buffer);
|
fclose (procfile);
|
fclose (procfile);
|
}
|
}
|
else
|
else
|
warning (_("unable to open /proc file '%s'"), fname1);
|
warning (_("unable to open /proc file '%s'"), fname1);
|
}
|
}
|
if (stat_f || all)
|
if (stat_f || all)
|
{
|
{
|
sprintf (fname1, "/proc/%lld/stat", pid);
|
sprintf (fname1, "/proc/%lld/stat", pid);
|
if ((procfile = fopen (fname1, "r")) != NULL)
|
if ((procfile = fopen (fname1, "r")) != NULL)
|
{
|
{
|
int itmp;
|
int itmp;
|
char ctmp;
|
char ctmp;
|
long ltmp;
|
long ltmp;
|
|
|
if (fscanf (procfile, "%d ", &itmp) > 0)
|
if (fscanf (procfile, "%d ", &itmp) > 0)
|
printf_filtered (_("Process: %d\n"), itmp);
|
printf_filtered (_("Process: %d\n"), itmp);
|
if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0)
|
if (fscanf (procfile, "(%[^)]) ", &buffer[0]) > 0)
|
printf_filtered (_("Exec file: %s\n"), buffer);
|
printf_filtered (_("Exec file: %s\n"), buffer);
|
if (fscanf (procfile, "%c ", &ctmp) > 0)
|
if (fscanf (procfile, "%c ", &ctmp) > 0)
|
printf_filtered (_("State: %c\n"), ctmp);
|
printf_filtered (_("State: %c\n"), ctmp);
|
if (fscanf (procfile, "%d ", &itmp) > 0)
|
if (fscanf (procfile, "%d ", &itmp) > 0)
|
printf_filtered (_("Parent process: %d\n"), itmp);
|
printf_filtered (_("Parent process: %d\n"), itmp);
|
if (fscanf (procfile, "%d ", &itmp) > 0)
|
if (fscanf (procfile, "%d ", &itmp) > 0)
|
printf_filtered (_("Process group: %d\n"), itmp);
|
printf_filtered (_("Process group: %d\n"), itmp);
|
if (fscanf (procfile, "%d ", &itmp) > 0)
|
if (fscanf (procfile, "%d ", &itmp) > 0)
|
printf_filtered (_("Session id: %d\n"), itmp);
|
printf_filtered (_("Session id: %d\n"), itmp);
|
if (fscanf (procfile, "%d ", &itmp) > 0)
|
if (fscanf (procfile, "%d ", &itmp) > 0)
|
printf_filtered (_("TTY: %d\n"), itmp);
|
printf_filtered (_("TTY: %d\n"), itmp);
|
if (fscanf (procfile, "%d ", &itmp) > 0)
|
if (fscanf (procfile, "%d ", &itmp) > 0)
|
printf_filtered (_("TTY owner process group: %d\n"), itmp);
|
printf_filtered (_("TTY owner process group: %d\n"), itmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
printf_filtered (_("Flags: 0x%lx\n"), ltmp);
|
printf_filtered (_("Flags: 0x%lx\n"), ltmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
printf_filtered (_("Minor faults (no memory page): %lu\n"),
|
printf_filtered (_("Minor faults (no memory page): %lu\n"),
|
(unsigned long) ltmp);
|
(unsigned long) ltmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
printf_filtered (_("Minor faults, children: %lu\n"),
|
printf_filtered (_("Minor faults, children: %lu\n"),
|
(unsigned long) ltmp);
|
(unsigned long) ltmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
printf_filtered (_("Major faults (memory page faults): %lu\n"),
|
printf_filtered (_("Major faults (memory page faults): %lu\n"),
|
(unsigned long) ltmp);
|
(unsigned long) ltmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
printf_filtered (_("Major faults, children: %lu\n"),
|
printf_filtered (_("Major faults, children: %lu\n"),
|
(unsigned long) ltmp);
|
(unsigned long) ltmp);
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
printf_filtered (_("utime: %ld\n"), ltmp);
|
printf_filtered (_("utime: %ld\n"), ltmp);
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
printf_filtered (_("stime: %ld\n"), ltmp);
|
printf_filtered (_("stime: %ld\n"), ltmp);
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
printf_filtered (_("utime, children: %ld\n"), ltmp);
|
printf_filtered (_("utime, children: %ld\n"), ltmp);
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
printf_filtered (_("stime, children: %ld\n"), ltmp);
|
printf_filtered (_("stime, children: %ld\n"), ltmp);
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
printf_filtered (_("jiffies remaining in current time slice: %ld\n"),
|
printf_filtered (_("jiffies remaining in current time slice: %ld\n"),
|
ltmp);
|
ltmp);
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
printf_filtered (_("'nice' value: %ld\n"), ltmp);
|
printf_filtered (_("'nice' value: %ld\n"), ltmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
printf_filtered (_("jiffies until next timeout: %lu\n"),
|
printf_filtered (_("jiffies until next timeout: %lu\n"),
|
(unsigned long) ltmp);
|
(unsigned long) ltmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
printf_filtered (_("jiffies until next SIGALRM: %lu\n"),
|
printf_filtered (_("jiffies until next SIGALRM: %lu\n"),
|
(unsigned long) ltmp);
|
(unsigned long) ltmp);
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
printf_filtered (_("start time (jiffies since system boot): %ld\n"),
|
printf_filtered (_("start time (jiffies since system boot): %ld\n"),
|
ltmp);
|
ltmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
printf_filtered (_("Virtual memory size: %lu\n"),
|
printf_filtered (_("Virtual memory size: %lu\n"),
|
(unsigned long) ltmp);
|
(unsigned long) ltmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp);
|
printf_filtered (_("Resident set size: %lu\n"), (unsigned long) ltmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp);
|
printf_filtered (_("rlim: %lu\n"), (unsigned long) ltmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
printf_filtered (_("Start of text: 0x%lx\n"), ltmp);
|
printf_filtered (_("Start of text: 0x%lx\n"), ltmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
printf_filtered (_("End of text: 0x%lx\n"), ltmp);
|
printf_filtered (_("End of text: 0x%lx\n"), ltmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
if (fscanf (procfile, "%lu ", <mp) > 0)
|
printf_filtered (_("Start of stack: 0x%lx\n"), ltmp);
|
printf_filtered (_("Start of stack: 0x%lx\n"), ltmp);
|
#if 0 /* Don't know how architecture-dependent the rest is...
|
#if 0 /* Don't know how architecture-dependent the rest is...
|
Anyway the signal bitmap info is available from "status". */
|
Anyway the signal bitmap info is available from "status". */
|
if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */
|
if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */
|
printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp);
|
printf_filtered (_("Kernel stack pointer: 0x%lx\n"), ltmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */
|
if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */
|
printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp);
|
printf_filtered (_("Kernel instr pointer: 0x%lx\n"), ltmp);
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp);
|
printf_filtered (_("Pending signals bitmap: 0x%lx\n"), ltmp);
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp);
|
printf_filtered (_("Blocked signals bitmap: 0x%lx\n"), ltmp);
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp);
|
printf_filtered (_("Ignored signals bitmap: 0x%lx\n"), ltmp);
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
if (fscanf (procfile, "%ld ", <mp) > 0)
|
printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp);
|
printf_filtered (_("Catched signals bitmap: 0x%lx\n"), ltmp);
|
if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */
|
if (fscanf (procfile, "%lu ", <mp) > 0) /* FIXME arch? */
|
printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp);
|
printf_filtered (_("wchan (system call): 0x%lx\n"), ltmp);
|
#endif
|
#endif
|
fclose (procfile);
|
fclose (procfile);
|
}
|
}
|
else
|
else
|
warning (_("unable to open /proc file '%s'"), fname1);
|
warning (_("unable to open /proc file '%s'"), fname1);
|
}
|
}
|
}
|
}
|
|
|
/* Implement the to_xfer_partial interface for memory reads using the /proc
|
/* Implement the to_xfer_partial interface for memory reads using the /proc
|
filesystem. Because we can use a single read() call for /proc, this
|
filesystem. Because we can use a single read() call for /proc, this
|
can be much more efficient than banging away at PTRACE_PEEKTEXT,
|
can be much more efficient than banging away at PTRACE_PEEKTEXT,
|
but it doesn't support writes. */
|
but it doesn't support writes. */
|
|
|
static LONGEST
|
static LONGEST
|
linux_proc_xfer_partial (struct target_ops *ops, enum target_object object,
|
linux_proc_xfer_partial (struct target_ops *ops, enum target_object object,
|
const char *annex, gdb_byte *readbuf,
|
const char *annex, gdb_byte *readbuf,
|
const gdb_byte *writebuf,
|
const gdb_byte *writebuf,
|
ULONGEST offset, LONGEST len)
|
ULONGEST offset, LONGEST len)
|
{
|
{
|
LONGEST ret;
|
LONGEST ret;
|
int fd;
|
int fd;
|
char filename[64];
|
char filename[64];
|
|
|
if (object != TARGET_OBJECT_MEMORY || !readbuf)
|
if (object != TARGET_OBJECT_MEMORY || !readbuf)
|
return 0;
|
return 0;
|
|
|
/* Don't bother for one word. */
|
/* Don't bother for one word. */
|
if (len < 3 * sizeof (long))
|
if (len < 3 * sizeof (long))
|
return 0;
|
return 0;
|
|
|
/* 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/%d/mem", PIDGET (inferior_ptid));
|
sprintf (filename, "/proc/%d/mem", PIDGET (inferior_ptid));
|
fd = open (filename, O_RDONLY | O_LARGEFILE);
|
fd = open (filename, O_RDONLY | O_LARGEFILE);
|
if (fd == -1)
|
if (fd == -1)
|
return 0;
|
return 0;
|
|
|
/* 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, readbuf, len, offset) != len)
|
if (pread64 (fd, readbuf, len, offset) != len)
|
#else
|
#else
|
if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len)
|
if (lseek (fd, offset, SEEK_SET) == -1 || read (fd, readbuf, len) != len)
|
#endif
|
#endif
|
ret = 0;
|
ret = 0;
|
else
|
else
|
ret = len;
|
ret = len;
|
|
|
close (fd);
|
close (fd);
|
return ret;
|
return ret;
|
}
|
}
|
|
|
/* Parse LINE as a signal set and add its set bits to SIGS. */
|
/* Parse LINE as a signal set and add its set bits to SIGS. */
|
|
|
static void
|
static void
|
add_line_to_sigset (const char *line, sigset_t *sigs)
|
add_line_to_sigset (const char *line, sigset_t *sigs)
|
{
|
{
|
int len = strlen (line) - 1;
|
int len = strlen (line) - 1;
|
const char *p;
|
const char *p;
|
int signum;
|
int signum;
|
|
|
if (line[len] != '\n')
|
if (line[len] != '\n')
|
error (_("Could not parse signal set: %s"), line);
|
error (_("Could not parse signal set: %s"), line);
|
|
|
p = line;
|
p = line;
|
signum = len * 4;
|
signum = len * 4;
|
while (len-- > 0)
|
while (len-- > 0)
|
{
|
{
|
int digit;
|
int digit;
|
|
|
if (*p >= '0' && *p <= '9')
|
if (*p >= '0' && *p <= '9')
|
digit = *p - '0';
|
digit = *p - '0';
|
else if (*p >= 'a' && *p <= 'f')
|
else if (*p >= 'a' && *p <= 'f')
|
digit = *p - 'a' + 10;
|
digit = *p - 'a' + 10;
|
else
|
else
|
error (_("Could not parse signal set: %s"), line);
|
error (_("Could not parse signal set: %s"), line);
|
|
|
signum -= 4;
|
signum -= 4;
|
|
|
if (digit & 1)
|
if (digit & 1)
|
sigaddset (sigs, signum + 1);
|
sigaddset (sigs, signum + 1);
|
if (digit & 2)
|
if (digit & 2)
|
sigaddset (sigs, signum + 2);
|
sigaddset (sigs, signum + 2);
|
if (digit & 4)
|
if (digit & 4)
|
sigaddset (sigs, signum + 3);
|
sigaddset (sigs, signum + 3);
|
if (digit & 8)
|
if (digit & 8)
|
sigaddset (sigs, signum + 4);
|
sigaddset (sigs, signum + 4);
|
|
|
p++;
|
p++;
|
}
|
}
|
}
|
}
|
|
|
/* Find process PID's pending signals from /proc/pid/status and set
|
/* Find process PID's pending signals from /proc/pid/status and set
|
SIGS to match. */
|
SIGS to match. */
|
|
|
void
|
void
|
linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored)
|
linux_proc_pending_signals (int pid, sigset_t *pending, sigset_t *blocked, sigset_t *ignored)
|
{
|
{
|
FILE *procfile;
|
FILE *procfile;
|
char buffer[MAXPATHLEN], fname[MAXPATHLEN];
|
char buffer[MAXPATHLEN], fname[MAXPATHLEN];
|
int signum;
|
int signum;
|
|
|
sigemptyset (pending);
|
sigemptyset (pending);
|
sigemptyset (blocked);
|
sigemptyset (blocked);
|
sigemptyset (ignored);
|
sigemptyset (ignored);
|
sprintf (fname, "/proc/%d/status", pid);
|
sprintf (fname, "/proc/%d/status", pid);
|
procfile = fopen (fname, "r");
|
procfile = fopen (fname, "r");
|
if (procfile == NULL)
|
if (procfile == NULL)
|
error (_("Could not open %s"), fname);
|
error (_("Could not open %s"), fname);
|
|
|
while (fgets (buffer, MAXPATHLEN, procfile) != NULL)
|
while (fgets (buffer, MAXPATHLEN, procfile) != NULL)
|
{
|
{
|
/* Normal queued signals are on the SigPnd line in the status
|
/* Normal queued signals are on the SigPnd line in the status
|
file. However, 2.6 kernels also have a "shared" pending
|
file. However, 2.6 kernels also have a "shared" pending
|
queue for delivering signals to a thread group, so check for
|
queue for delivering signals to a thread group, so check for
|
a ShdPnd line also.
|
a ShdPnd line also.
|
|
|
Unfortunately some Red Hat kernels include the shared pending
|
Unfortunately some Red Hat kernels include the shared pending
|
queue but not the ShdPnd status field. */
|
queue but not the ShdPnd status field. */
|
|
|
if (strncmp (buffer, "SigPnd:\t", 8) == 0)
|
if (strncmp (buffer, "SigPnd:\t", 8) == 0)
|
add_line_to_sigset (buffer + 8, pending);
|
add_line_to_sigset (buffer + 8, pending);
|
else if (strncmp (buffer, "ShdPnd:\t", 8) == 0)
|
else if (strncmp (buffer, "ShdPnd:\t", 8) == 0)
|
add_line_to_sigset (buffer + 8, pending);
|
add_line_to_sigset (buffer + 8, pending);
|
else if (strncmp (buffer, "SigBlk:\t", 8) == 0)
|
else if (strncmp (buffer, "SigBlk:\t", 8) == 0)
|
add_line_to_sigset (buffer + 8, blocked);
|
add_line_to_sigset (buffer + 8, blocked);
|
else if (strncmp (buffer, "SigIgn:\t", 8) == 0)
|
else if (strncmp (buffer, "SigIgn:\t", 8) == 0)
|
add_line_to_sigset (buffer + 8, ignored);
|
add_line_to_sigset (buffer + 8, ignored);
|
}
|
}
|
|
|
fclose (procfile);
|
fclose (procfile);
|
}
|
}
|
|
|
static LONGEST
|
static LONGEST
|
linux_xfer_partial (struct target_ops *ops, enum target_object object,
|
linux_xfer_partial (struct target_ops *ops, enum target_object object,
|
const char *annex, gdb_byte *readbuf,
|
const char *annex, gdb_byte *readbuf,
|
const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
|
const gdb_byte *writebuf, ULONGEST offset, LONGEST len)
|
{
|
{
|
LONGEST xfer;
|
LONGEST xfer;
|
|
|
if (object == TARGET_OBJECT_AUXV)
|
if (object == TARGET_OBJECT_AUXV)
|
return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf,
|
return procfs_xfer_auxv (ops, object, annex, readbuf, writebuf,
|
offset, len);
|
offset, len);
|
|
|
xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf,
|
xfer = linux_proc_xfer_partial (ops, object, annex, readbuf, writebuf,
|
offset, len);
|
offset, len);
|
if (xfer != 0)
|
if (xfer != 0)
|
return xfer;
|
return xfer;
|
|
|
return super_xfer_partial (ops, object, annex, readbuf, writebuf,
|
return super_xfer_partial (ops, object, annex, readbuf, writebuf,
|
offset, len);
|
offset, len);
|
}
|
}
|
|
|
/* Create a prototype generic GNU/Linux target. The client can override
|
/* Create a prototype generic GNU/Linux target. The client can override
|
it with local methods. */
|
it with local methods. */
|
|
|
static void
|
static void
|
linux_target_install_ops (struct target_ops *t)
|
linux_target_install_ops (struct target_ops *t)
|
{
|
{
|
t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint;
|
t->to_insert_fork_catchpoint = linux_child_insert_fork_catchpoint;
|
t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint;
|
t->to_insert_vfork_catchpoint = linux_child_insert_vfork_catchpoint;
|
t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint;
|
t->to_insert_exec_catchpoint = linux_child_insert_exec_catchpoint;
|
t->to_pid_to_exec_file = linux_child_pid_to_exec_file;
|
t->to_pid_to_exec_file = linux_child_pid_to_exec_file;
|
t->to_post_startup_inferior = linux_child_post_startup_inferior;
|
t->to_post_startup_inferior = linux_child_post_startup_inferior;
|
t->to_post_attach = linux_child_post_attach;
|
t->to_post_attach = linux_child_post_attach;
|
t->to_follow_fork = linux_child_follow_fork;
|
t->to_follow_fork = linux_child_follow_fork;
|
t->to_find_memory_regions = linux_nat_find_memory_regions;
|
t->to_find_memory_regions = linux_nat_find_memory_regions;
|
t->to_make_corefile_notes = linux_nat_make_corefile_notes;
|
t->to_make_corefile_notes = linux_nat_make_corefile_notes;
|
|
|
super_xfer_partial = t->to_xfer_partial;
|
super_xfer_partial = t->to_xfer_partial;
|
t->to_xfer_partial = linux_xfer_partial;
|
t->to_xfer_partial = linux_xfer_partial;
|
}
|
}
|
|
|
struct target_ops *
|
struct target_ops *
|
linux_target (void)
|
linux_target (void)
|
{
|
{
|
struct target_ops *t;
|
struct target_ops *t;
|
|
|
t = inf_ptrace_target ();
|
t = inf_ptrace_target ();
|
linux_target_install_ops (t);
|
linux_target_install_ops (t);
|
|
|
return t;
|
return t;
|
}
|
}
|
|
|
struct target_ops *
|
struct target_ops *
|
linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int))
|
linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int))
|
{
|
{
|
struct target_ops *t;
|
struct target_ops *t;
|
|
|
t = inf_ptrace_trad_target (register_u_offset);
|
t = inf_ptrace_trad_target (register_u_offset);
|
linux_target_install_ops (t);
|
linux_target_install_ops (t);
|
|
|
return t;
|
return t;
|
}
|
}
|
|
|
void
|
void
|
linux_nat_add_target (struct target_ops *t)
|
linux_nat_add_target (struct target_ops *t)
|
{
|
{
|
/* Save the provided single-threaded target. We save this in a separate
|
/* Save the provided single-threaded target. We save this in a separate
|
variable because another target we've inherited from (e.g. inf-ptrace)
|
variable because another target we've inherited from (e.g. inf-ptrace)
|
may have saved a pointer to T; we want to use it for the final
|
may have saved a pointer to T; we want to use it for the final
|
process stratum target. */
|
process stratum target. */
|
linux_ops_saved = *t;
|
linux_ops_saved = *t;
|
linux_ops = &linux_ops_saved;
|
linux_ops = &linux_ops_saved;
|
|
|
/* Override some methods for multithreading. */
|
/* Override some methods for multithreading. */
|
t->to_attach = linux_nat_attach;
|
t->to_attach = linux_nat_attach;
|
t->to_detach = linux_nat_detach;
|
t->to_detach = linux_nat_detach;
|
t->to_resume = linux_nat_resume;
|
t->to_resume = linux_nat_resume;
|
t->to_wait = linux_nat_wait;
|
t->to_wait = linux_nat_wait;
|
t->to_xfer_partial = linux_nat_xfer_partial;
|
t->to_xfer_partial = linux_nat_xfer_partial;
|
t->to_kill = linux_nat_kill;
|
t->to_kill = linux_nat_kill;
|
t->to_mourn_inferior = linux_nat_mourn_inferior;
|
t->to_mourn_inferior = linux_nat_mourn_inferior;
|
t->to_thread_alive = linux_nat_thread_alive;
|
t->to_thread_alive = linux_nat_thread_alive;
|
t->to_pid_to_str = linux_nat_pid_to_str;
|
t->to_pid_to_str = linux_nat_pid_to_str;
|
t->to_has_thread_control = tc_schedlock;
|
t->to_has_thread_control = tc_schedlock;
|
|
|
/* We don't change the stratum; this target will sit at
|
/* We don't change the stratum; this target will sit at
|
process_stratum and thread_db will set at thread_stratum. This
|
process_stratum and thread_db will set at thread_stratum. This
|
is a little strange, since this is a multi-threaded-capable
|
is a little strange, since this is a multi-threaded-capable
|
target, but we want to be on the stack below thread_db, and we
|
target, but we want to be on the stack below thread_db, and we
|
also want to be used for single-threaded processes. */
|
also want to be used for single-threaded processes. */
|
|
|
add_target (t);
|
add_target (t);
|
|
|
/* TODO: Eliminate this and have libthread_db use
|
/* TODO: Eliminate this and have libthread_db use
|
find_target_beneath. */
|
find_target_beneath. */
|
thread_db_init (t);
|
thread_db_init (t);
|
}
|
}
|
|
|
/* Register a method to call whenever a new thread is attached. */
|
/* Register a method to call whenever a new thread is attached. */
|
void
|
void
|
linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t))
|
linux_nat_set_new_thread (struct target_ops *t, void (*new_thread) (ptid_t))
|
{
|
{
|
/* Save the pointer. We only support a single registered instance
|
/* Save the pointer. We only support a single registered instance
|
of the GNU/Linux native target, so we do not need to map this to
|
of the GNU/Linux native target, so we do not need to map this to
|
T. */
|
T. */
|
linux_nat_new_thread = new_thread;
|
linux_nat_new_thread = new_thread;
|
}
|
}
|
|
|
/* Return the saved siginfo associated with PTID. */
|
/* Return the saved siginfo associated with PTID. */
|
struct siginfo *
|
struct siginfo *
|
linux_nat_get_siginfo (ptid_t ptid)
|
linux_nat_get_siginfo (ptid_t ptid)
|
{
|
{
|
struct lwp_info *lp = find_lwp_pid (ptid);
|
struct lwp_info *lp = find_lwp_pid (ptid);
|
|
|
gdb_assert (lp != NULL);
|
gdb_assert (lp != NULL);
|
|
|
return &lp->siginfo;
|
return &lp->siginfo;
|
}
|
}
|
|
|
void
|
void
|
_initialize_linux_nat (void)
|
_initialize_linux_nat (void)
|
{
|
{
|
struct sigaction action;
|
struct sigaction action;
|
|
|
add_info ("proc", linux_nat_info_proc_cmd, _("\
|
add_info ("proc", linux_nat_info_proc_cmd, _("\
|
Show /proc process information about any running process.\n\
|
Show /proc process information about any running process.\n\
|
Specify any process id, or use the program being debugged by default.\n\
|
Specify any process id, or use the program being debugged by default.\n\
|
Specify any of the following keywords for detailed info:\n\
|
Specify any of the following keywords for detailed info:\n\
|
mappings -- list of mapped memory regions.\n\
|
mappings -- list of mapped memory regions.\n\
|
stat -- list a bunch of random process info.\n\
|
stat -- list a bunch of random process info.\n\
|
status -- list a different bunch of random process info.\n\
|
status -- list a different bunch of random process info.\n\
|
all -- list all available /proc info."));
|
all -- list all available /proc info."));
|
|
|
/* Save the original signal mask. */
|
/* Save the original signal mask. */
|
sigprocmask (SIG_SETMASK, NULL, &normal_mask);
|
sigprocmask (SIG_SETMASK, NULL, &normal_mask);
|
|
|
action.sa_handler = sigchld_handler;
|
action.sa_handler = sigchld_handler;
|
sigemptyset (&action.sa_mask);
|
sigemptyset (&action.sa_mask);
|
action.sa_flags = SA_RESTART;
|
action.sa_flags = SA_RESTART;
|
sigaction (SIGCHLD, &action, NULL);
|
sigaction (SIGCHLD, &action, NULL);
|
|
|
/* Make sure we don't block SIGCHLD during a sigsuspend. */
|
/* Make sure we don't block SIGCHLD during a sigsuspend. */
|
sigprocmask (SIG_SETMASK, NULL, &suspend_mask);
|
sigprocmask (SIG_SETMASK, NULL, &suspend_mask);
|
sigdelset (&suspend_mask, SIGCHLD);
|
sigdelset (&suspend_mask, SIGCHLD);
|
|
|
sigemptyset (&blocked_mask);
|
sigemptyset (&blocked_mask);
|
|
|
add_setshow_zinteger_cmd ("lin-lwp", no_class, &debug_linux_nat, _("\
|
add_setshow_zinteger_cmd ("lin-lwp", no_class, &debug_linux_nat, _("\
|
Set debugging of GNU/Linux lwp module."), _("\
|
Set debugging of GNU/Linux lwp module."), _("\
|
Show debugging of GNU/Linux lwp module."), _("\
|
Show debugging of GNU/Linux lwp module."), _("\
|
Enables printf debugging output."),
|
Enables printf debugging output."),
|
NULL,
|
NULL,
|
show_debug_linux_nat,
|
show_debug_linux_nat,
|
&setdebuglist, &showdebuglist);
|
&setdebuglist, &showdebuglist);
|
}
|
}
|
|
|
|
|
/* FIXME: kettenis/2000-08-26: The stuff on this page is specific to
|
/* FIXME: kettenis/2000-08-26: The stuff on this page is specific to
|
the GNU/Linux Threads library and therefore doesn't really belong
|
the GNU/Linux Threads library and therefore doesn't really belong
|
here. */
|
here. */
|
|
|
/* Read variable NAME in the target and return its value if found.
|
/* Read variable NAME in the target and return its value if found.
|
Otherwise return zero. It is assumed that the type of the variable
|
Otherwise return zero. It is assumed that the type of the variable
|
is `int'. */
|
is `int'. */
|
|
|
static int
|
static int
|
get_signo (const char *name)
|
get_signo (const char *name)
|
{
|
{
|
struct minimal_symbol *ms;
|
struct minimal_symbol *ms;
|
int signo;
|
int signo;
|
|
|
ms = lookup_minimal_symbol (name, NULL, NULL);
|
ms = lookup_minimal_symbol (name, NULL, NULL);
|
if (ms == NULL)
|
if (ms == NULL)
|
return 0;
|
return 0;
|
|
|
if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo,
|
if (target_read_memory (SYMBOL_VALUE_ADDRESS (ms), (gdb_byte *) &signo,
|
sizeof (signo)) != 0)
|
sizeof (signo)) != 0)
|
return 0;
|
return 0;
|
|
|
return signo;
|
return signo;
|
}
|
}
|
|
|
/* Return the set of signals used by the threads library in *SET. */
|
/* Return the set of signals used by the threads library in *SET. */
|
|
|
void
|
void
|
lin_thread_get_thread_signals (sigset_t *set)
|
lin_thread_get_thread_signals (sigset_t *set)
|
{
|
{
|
struct sigaction action;
|
struct sigaction action;
|
int restart, cancel;
|
int restart, cancel;
|
|
|
sigemptyset (set);
|
sigemptyset (set);
|
|
|
restart = get_signo ("__pthread_sig_restart");
|
restart = get_signo ("__pthread_sig_restart");
|
cancel = get_signo ("__pthread_sig_cancel");
|
cancel = get_signo ("__pthread_sig_cancel");
|
|
|
/* LinuxThreads normally uses the first two RT signals, but in some legacy
|
/* LinuxThreads normally uses the first two RT signals, but in some legacy
|
cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does
|
cases may use SIGUSR1/SIGUSR2. NPTL always uses RT signals, but does
|
not provide any way for the debugger to query the signal numbers -
|
not provide any way for the debugger to query the signal numbers -
|
fortunately they don't change! */
|
fortunately they don't change! */
|
|
|
if (restart == 0)
|
if (restart == 0)
|
restart = __SIGRTMIN;
|
restart = __SIGRTMIN;
|
|
|
if (cancel == 0)
|
if (cancel == 0)
|
cancel = __SIGRTMIN + 1;
|
cancel = __SIGRTMIN + 1;
|
|
|
sigaddset (set, restart);
|
sigaddset (set, restart);
|
sigaddset (set, cancel);
|
sigaddset (set, cancel);
|
|
|
/* The GNU/Linux Threads library makes terminating threads send a
|
/* The GNU/Linux Threads library makes terminating threads send a
|
special "cancel" signal instead of SIGCHLD. Make sure we catch
|
special "cancel" signal instead of SIGCHLD. Make sure we catch
|
those (to prevent them from terminating GDB itself, which is
|
those (to prevent them from terminating GDB itself, which is
|
likely to be their default action) and treat them the same way as
|
likely to be their default action) and treat them the same way as
|
SIGCHLD. */
|
SIGCHLD. */
|
|
|
action.sa_handler = sigchld_handler;
|
action.sa_handler = sigchld_handler;
|
sigemptyset (&action.sa_mask);
|
sigemptyset (&action.sa_mask);
|
action.sa_flags = SA_RESTART;
|
action.sa_flags = SA_RESTART;
|
sigaction (cancel, &action, NULL);
|
sigaction (cancel, &action, NULL);
|
|
|
/* We block the "cancel" signal throughout this code ... */
|
/* We block the "cancel" signal throughout this code ... */
|
sigaddset (&blocked_mask, cancel);
|
sigaddset (&blocked_mask, cancel);
|
sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
|
sigprocmask (SIG_BLOCK, &blocked_mask, NULL);
|
|
|
/* ... except during a sigsuspend. */
|
/* ... except during a sigsuspend. */
|
sigdelset (&suspend_mask, cancel);
|
sigdelset (&suspend_mask, cancel);
|
}
|
}
|
|
|
|
|
