/* libthread_db assisted debugging support, generic parts.
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/* libthread_db assisted debugging support, generic parts.
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Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
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Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
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2010 Free Software Foundation, Inc.
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2010 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 "gdb_assert.h"
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#include "gdb_assert.h"
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#include <dlfcn.h>
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#include <dlfcn.h>
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#include "gdb_proc_service.h"
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#include "gdb_proc_service.h"
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#include "gdb_thread_db.h"
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#include "gdb_thread_db.h"
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#include "bfd.h"
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#include "bfd.h"
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#include "command.h"
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#include "command.h"
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#include "exceptions.h"
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#include "exceptions.h"
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#include "gdbcmd.h"
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#include "gdbcmd.h"
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#include "gdbthread.h"
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#include "gdbthread.h"
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#include "inferior.h"
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#include "inferior.h"
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#include "symfile.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "objfiles.h"
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#include "target.h"
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#include "target.h"
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#include "regcache.h"
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#include "regcache.h"
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#include "solib.h"
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#include "solib.h"
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#include "solib-svr4.h"
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#include "solib-svr4.h"
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#include "gdbcore.h"
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#include "gdbcore.h"
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#include "observer.h"
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#include "observer.h"
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#include "linux-nat.h"
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#include "linux-nat.h"
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#include <signal.h>
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#include <signal.h>
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#ifdef HAVE_GNU_LIBC_VERSION_H
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#ifdef HAVE_GNU_LIBC_VERSION_H
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#include <gnu/libc-version.h>
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#include <gnu/libc-version.h>
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#endif
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#endif
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/* GNU/Linux libthread_db support.
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/* GNU/Linux libthread_db support.
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libthread_db is a library, provided along with libpthread.so, which
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libthread_db is a library, provided along with libpthread.so, which
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exposes the internals of the thread library to a debugger. It
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exposes the internals of the thread library to a debugger. It
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allows GDB to find existing threads, new threads as they are
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allows GDB to find existing threads, new threads as they are
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created, thread IDs (usually, the result of pthread_self), and
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created, thread IDs (usually, the result of pthread_self), and
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thread-local variables.
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thread-local variables.
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The libthread_db interface originates on Solaris, where it is
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The libthread_db interface originates on Solaris, where it is
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both more powerful and more complicated. This implementation
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both more powerful and more complicated. This implementation
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only works for LinuxThreads and NPTL, the two glibc threading
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only works for LinuxThreads and NPTL, the two glibc threading
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libraries. It assumes that each thread is permanently assigned
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libraries. It assumes that each thread is permanently assigned
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to a single light-weight process (LWP).
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to a single light-weight process (LWP).
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libthread_db-specific information is stored in the "private" field
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libthread_db-specific information is stored in the "private" field
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of struct thread_info. When the field is NULL we do not yet have
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of struct thread_info. When the field is NULL we do not yet have
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information about the new thread; this could be temporary (created,
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information about the new thread; this could be temporary (created,
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but the thread library's data structures do not reflect it yet)
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but the thread library's data structures do not reflect it yet)
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or permanent (created using clone instead of pthread_create).
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or permanent (created using clone instead of pthread_create).
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Process IDs managed by linux-thread-db.c match those used by
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Process IDs managed by linux-thread-db.c match those used by
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linux-nat.c: a common PID for all processes, an LWP ID for each
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linux-nat.c: a common PID for all processes, an LWP ID for each
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thread, and no TID. We save the TID in private. Keeping it out
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thread, and no TID. We save the TID in private. Keeping it out
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of the ptid_t prevents thread IDs changing when libpthread is
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of the ptid_t prevents thread IDs changing when libpthread is
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loaded or unloaded. */
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loaded or unloaded. */
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static char *libthread_db_search_path;
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static char *libthread_db_search_path;
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/* If we're running on GNU/Linux, we must explicitly attach to any new
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/* If we're running on GNU/Linux, we must explicitly attach to any new
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threads. */
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threads. */
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/* This module's target vector. */
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/* This module's target vector. */
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static struct target_ops thread_db_ops;
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static struct target_ops thread_db_ops;
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/* Non-zero if we have determined the signals used by the threads
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/* Non-zero if we have determined the signals used by the threads
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library. */
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library. */
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static int thread_signals;
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static int thread_signals;
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static sigset_t thread_stop_set;
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static sigset_t thread_stop_set;
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static sigset_t thread_print_set;
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static sigset_t thread_print_set;
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struct thread_db_info
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struct thread_db_info
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{
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{
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struct thread_db_info *next;
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struct thread_db_info *next;
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/* Process id this object refers to. */
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/* Process id this object refers to. */
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int pid;
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int pid;
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/* Handle from dlopen for libthread_db.so. */
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/* Handle from dlopen for libthread_db.so. */
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void *handle;
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void *handle;
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/* Structure that identifies the child process for the
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/* Structure that identifies the child process for the
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<proc_service.h> interface. */
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<proc_service.h> interface. */
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struct ps_prochandle proc_handle;
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struct ps_prochandle proc_handle;
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/* Connection to the libthread_db library. */
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/* Connection to the libthread_db library. */
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td_thragent_t *thread_agent;
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td_thragent_t *thread_agent;
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/* True if we need to apply the workaround for glibc/BZ5983. When
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/* True if we need to apply the workaround for glibc/BZ5983. When
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we catch a PTRACE_O_TRACEFORK, and go query the child's thread
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we catch a PTRACE_O_TRACEFORK, and go query the child's thread
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list, nptl_db returns the parent's threads in addition to the new
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list, nptl_db returns the parent's threads in addition to the new
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(single) child thread. If this flag is set, we do extra work to
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(single) child thread. If this flag is set, we do extra work to
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be able to ignore such stale entries. */
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be able to ignore such stale entries. */
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int need_stale_parent_threads_check;
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int need_stale_parent_threads_check;
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/* Location of the thread creation event breakpoint. The code at
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/* Location of the thread creation event breakpoint. The code at
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this location in the child process will be called by the pthread
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this location in the child process will be called by the pthread
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library whenever a new thread is created. By setting a special
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library whenever a new thread is created. By setting a special
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breakpoint at this location, GDB can detect when a new thread is
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breakpoint at this location, GDB can detect when a new thread is
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created. We obtain this location via the td_ta_event_addr
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created. We obtain this location via the td_ta_event_addr
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call. */
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call. */
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CORE_ADDR td_create_bp_addr;
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CORE_ADDR td_create_bp_addr;
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/* Location of the thread death event breakpoint. */
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/* Location of the thread death event breakpoint. */
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CORE_ADDR td_death_bp_addr;
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CORE_ADDR td_death_bp_addr;
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/* Pointers to the libthread_db functions. */
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/* Pointers to the libthread_db functions. */
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td_err_e (*td_init_p) (void);
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td_err_e (*td_init_p) (void);
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td_err_e (*td_ta_new_p) (struct ps_prochandle * ps,
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td_err_e (*td_ta_new_p) (struct ps_prochandle * ps,
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td_thragent_t **ta);
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td_thragent_t **ta);
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td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt,
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td_err_e (*td_ta_map_id2thr_p) (const td_thragent_t *ta, thread_t pt,
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td_thrhandle_t *__th);
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td_thrhandle_t *__th);
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td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta,
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td_err_e (*td_ta_map_lwp2thr_p) (const td_thragent_t *ta,
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lwpid_t lwpid, td_thrhandle_t *th);
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lwpid_t lwpid, td_thrhandle_t *th);
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td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta,
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td_err_e (*td_ta_thr_iter_p) (const td_thragent_t *ta,
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td_thr_iter_f *callback, void *cbdata_p,
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td_thr_iter_f *callback, void *cbdata_p,
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td_thr_state_e state, int ti_pri,
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td_thr_state_e state, int ti_pri,
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sigset_t *ti_sigmask_p,
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sigset_t *ti_sigmask_p,
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unsigned int ti_user_flags);
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unsigned int ti_user_flags);
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td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta,
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td_err_e (*td_ta_event_addr_p) (const td_thragent_t *ta,
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td_event_e event, td_notify_t *ptr);
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td_event_e event, td_notify_t *ptr);
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td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta,
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td_err_e (*td_ta_set_event_p) (const td_thragent_t *ta,
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td_thr_events_t *event);
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td_thr_events_t *event);
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td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta,
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td_err_e (*td_ta_clear_event_p) (const td_thragent_t *ta,
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td_thr_events_t *event);
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td_thr_events_t *event);
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td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta,
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td_err_e (*td_ta_event_getmsg_p) (const td_thragent_t *ta,
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td_event_msg_t *msg);
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td_event_msg_t *msg);
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td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th);
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td_err_e (*td_thr_validate_p) (const td_thrhandle_t *th);
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td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th,
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td_err_e (*td_thr_get_info_p) (const td_thrhandle_t *th,
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td_thrinfo_t *infop);
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td_thrinfo_t *infop);
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td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th,
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td_err_e (*td_thr_event_enable_p) (const td_thrhandle_t *th,
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int event);
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int event);
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td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th,
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td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th,
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psaddr_t map_address,
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psaddr_t map_address,
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size_t offset, psaddr_t *address);
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size_t offset, psaddr_t *address);
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};
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};
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/* List of known processes using thread_db, and the required
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/* List of known processes using thread_db, and the required
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bookkeeping. */
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bookkeeping. */
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struct thread_db_info *thread_db_list;
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struct thread_db_info *thread_db_list;
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static void thread_db_find_new_threads_1 (ptid_t ptid);
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static void thread_db_find_new_threads_1 (ptid_t ptid);
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static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new);
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static void thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new);
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/* Add the current inferior to the list of processes using libpthread.
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/* Add the current inferior to the list of processes using libpthread.
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Return a pointer to the newly allocated object that was added to
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Return a pointer to the newly allocated object that was added to
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THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing
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THREAD_DB_LIST. HANDLE is the handle returned by dlopen'ing
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LIBTHREAD_DB_SO. */
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LIBTHREAD_DB_SO. */
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static struct thread_db_info *
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static struct thread_db_info *
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add_thread_db_info (void *handle)
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add_thread_db_info (void *handle)
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{
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{
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int pid;
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int pid;
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struct thread_db_info *info;
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struct thread_db_info *info;
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info = xcalloc (1, sizeof (*info));
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info = xcalloc (1, sizeof (*info));
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info->pid = ptid_get_pid (inferior_ptid);
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info->pid = ptid_get_pid (inferior_ptid);
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info->handle = handle;
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info->handle = handle;
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info->need_stale_parent_threads_check = 1;
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info->need_stale_parent_threads_check = 1;
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info->next = thread_db_list;
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info->next = thread_db_list;
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thread_db_list = info;
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thread_db_list = info;
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return info;
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return info;
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}
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}
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/* Return the thread_db_info object representing the bookkeeping
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/* Return the thread_db_info object representing the bookkeeping
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related to process PID, if any; NULL otherwise. */
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related to process PID, if any; NULL otherwise. */
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static struct thread_db_info *
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static struct thread_db_info *
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get_thread_db_info (int pid)
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get_thread_db_info (int pid)
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{
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{
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struct thread_db_info *info;
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struct thread_db_info *info;
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for (info = thread_db_list; info; info = info->next)
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for (info = thread_db_list; info; info = info->next)
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if (pid == info->pid)
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if (pid == info->pid)
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return info;
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return info;
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return NULL;
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return NULL;
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}
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}
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/* When PID has exited or has been detached, we no longer want to keep
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/* When PID has exited or has been detached, we no longer want to keep
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track of it as using libpthread. Call this function to discard
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track of it as using libpthread. Call this function to discard
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thread_db related info related to PID. Note that this closes
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thread_db related info related to PID. Note that this closes
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LIBTHREAD_DB_SO's dlopen'ed handle. */
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LIBTHREAD_DB_SO's dlopen'ed handle. */
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static void
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static void
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delete_thread_db_info (int pid)
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delete_thread_db_info (int pid)
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{
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{
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struct thread_db_info *info, *info_prev;
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struct thread_db_info *info, *info_prev;
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info_prev = NULL;
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info_prev = NULL;
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for (info = thread_db_list; info; info_prev = info, info = info->next)
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for (info = thread_db_list; info; info_prev = info, info = info->next)
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if (pid == info->pid)
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if (pid == info->pid)
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break;
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break;
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if (info == NULL)
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if (info == NULL)
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return;
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return;
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if (info->handle != NULL)
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if (info->handle != NULL)
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dlclose (info->handle);
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dlclose (info->handle);
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if (info_prev)
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if (info_prev)
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info_prev->next = info->next;
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info_prev->next = info->next;
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else
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else
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thread_db_list = info->next;
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thread_db_list = info->next;
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xfree (info);
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xfree (info);
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}
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}
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/* Prototypes for local functions. */
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/* Prototypes for local functions. */
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static int attach_thread (ptid_t ptid, const td_thrhandle_t *th_p,
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static int attach_thread (ptid_t ptid, const td_thrhandle_t *th_p,
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const td_thrinfo_t *ti_p);
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const td_thrinfo_t *ti_p);
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static void detach_thread (ptid_t ptid);
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static void detach_thread (ptid_t ptid);
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/* Use "struct private_thread_info" to cache thread state. This is
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/* Use "struct private_thread_info" to cache thread state. This is
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a substantial optimization. */
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a substantial optimization. */
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struct private_thread_info
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struct private_thread_info
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{
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{
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/* Flag set when we see a TD_DEATH event for this thread. */
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/* Flag set when we see a TD_DEATH event for this thread. */
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unsigned int dying:1;
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unsigned int dying:1;
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/* Cached thread state. */
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/* Cached thread state. */
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td_thrhandle_t th;
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td_thrhandle_t th;
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thread_t tid;
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thread_t tid;
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};
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};
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static char *
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static char *
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thread_db_err_str (td_err_e err)
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thread_db_err_str (td_err_e err)
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{
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{
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static char buf[64];
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static char buf[64];
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switch (err)
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switch (err)
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{
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{
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case TD_OK:
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case TD_OK:
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return "generic 'call succeeded'";
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return "generic 'call succeeded'";
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case TD_ERR:
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case TD_ERR:
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return "generic error";
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return "generic error";
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case TD_NOTHR:
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case TD_NOTHR:
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return "no thread to satisfy query";
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return "no thread to satisfy query";
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case TD_NOSV:
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case TD_NOSV:
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return "no sync handle to satisfy query";
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return "no sync handle to satisfy query";
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case TD_NOLWP:
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case TD_NOLWP:
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return "no LWP to satisfy query";
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return "no LWP to satisfy query";
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case TD_BADPH:
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case TD_BADPH:
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return "invalid process handle";
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return "invalid process handle";
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case TD_BADTH:
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case TD_BADTH:
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return "invalid thread handle";
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return "invalid thread handle";
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case TD_BADSH:
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case TD_BADSH:
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return "invalid synchronization handle";
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return "invalid synchronization handle";
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case TD_BADTA:
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case TD_BADTA:
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return "invalid thread agent";
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return "invalid thread agent";
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case TD_BADKEY:
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case TD_BADKEY:
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return "invalid key";
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return "invalid key";
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case TD_NOMSG:
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case TD_NOMSG:
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return "no event message for getmsg";
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return "no event message for getmsg";
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case TD_NOFPREGS:
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case TD_NOFPREGS:
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return "FPU register set not available";
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return "FPU register set not available";
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case TD_NOLIBTHREAD:
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case TD_NOLIBTHREAD:
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return "application not linked with libthread";
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return "application not linked with libthread";
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case TD_NOEVENT:
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case TD_NOEVENT:
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return "requested event is not supported";
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return "requested event is not supported";
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case TD_NOCAPAB:
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case TD_NOCAPAB:
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return "capability not available";
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return "capability not available";
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case TD_DBERR:
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case TD_DBERR:
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return "debugger service failed";
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return "debugger service failed";
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case TD_NOAPLIC:
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case TD_NOAPLIC:
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return "operation not applicable to";
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return "operation not applicable to";
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case TD_NOTSD:
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case TD_NOTSD:
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return "no thread-specific data for this thread";
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return "no thread-specific data for this thread";
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case TD_MALLOC:
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case TD_MALLOC:
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return "malloc failed";
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return "malloc failed";
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case TD_PARTIALREG:
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case TD_PARTIALREG:
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return "only part of register set was written/read";
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return "only part of register set was written/read";
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case TD_NOXREGS:
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case TD_NOXREGS:
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return "X register set not available for this thread";
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return "X register set not available for this thread";
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#ifdef THREAD_DB_HAS_TD_NOTALLOC
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#ifdef THREAD_DB_HAS_TD_NOTALLOC
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case TD_NOTALLOC:
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case TD_NOTALLOC:
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return "thread has not yet allocated TLS for given module";
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return "thread has not yet allocated TLS for given module";
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#endif
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#endif
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#ifdef THREAD_DB_HAS_TD_VERSION
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#ifdef THREAD_DB_HAS_TD_VERSION
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case TD_VERSION:
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case TD_VERSION:
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return "versions of libpthread and libthread_db do not match";
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return "versions of libpthread and libthread_db do not match";
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#endif
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#endif
|
#ifdef THREAD_DB_HAS_TD_NOTLS
|
#ifdef THREAD_DB_HAS_TD_NOTLS
|
case TD_NOTLS:
|
case TD_NOTLS:
|
return "there is no TLS segment in the given module";
|
return "there is no TLS segment in the given module";
|
#endif
|
#endif
|
default:
|
default:
|
snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err);
|
snprintf (buf, sizeof (buf), "unknown thread_db error '%d'", err);
|
return buf;
|
return buf;
|
}
|
}
|
}
|
}
|
|
|
/* Return 1 if any threads have been registered. There may be none if
|
/* Return 1 if any threads have been registered. There may be none if
|
the threading library is not fully initialized yet. */
|
the threading library is not fully initialized yet. */
|
|
|
static int
|
static int
|
have_threads_callback (struct thread_info *thread, void *args)
|
have_threads_callback (struct thread_info *thread, void *args)
|
{
|
{
|
int pid = * (int *) args;
|
int pid = * (int *) args;
|
if (ptid_get_pid (thread->ptid) != pid)
|
if (ptid_get_pid (thread->ptid) != pid)
|
return 0;
|
return 0;
|
|
|
return thread->private != NULL;
|
return thread->private != NULL;
|
}
|
}
|
|
|
static int
|
static int
|
have_threads (ptid_t ptid)
|
have_threads (ptid_t ptid)
|
{
|
{
|
int pid = ptid_get_pid (ptid);
|
int pid = ptid_get_pid (ptid);
|
|
|
return iterate_over_threads (have_threads_callback, &pid) != NULL;
|
return iterate_over_threads (have_threads_callback, &pid) != NULL;
|
}
|
}
|
|
|
struct thread_get_info_inout
|
struct thread_get_info_inout
|
{
|
{
|
struct thread_info *thread_info;
|
struct thread_info *thread_info;
|
struct thread_db_info *thread_db_info;
|
struct thread_db_info *thread_db_info;
|
};
|
};
|
|
|
/* A callback function for td_ta_thr_iter, which we use to map all
|
/* A callback function for td_ta_thr_iter, which we use to map all
|
threads to LWPs.
|
threads to LWPs.
|
|
|
THP is a handle to the current thread; if INFOP is not NULL, the
|
THP is a handle to the current thread; if INFOP is not NULL, the
|
struct thread_info associated with this thread is returned in
|
struct thread_info associated with this thread is returned in
|
*INFOP.
|
*INFOP.
|
|
|
If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise,
|
If the thread is a zombie, TD_THR_ZOMBIE is returned. Otherwise,
|
zero is returned to indicate success. */
|
zero is returned to indicate success. */
|
|
|
static int
|
static int
|
thread_get_info_callback (const td_thrhandle_t *thp, void *argp)
|
thread_get_info_callback (const td_thrhandle_t *thp, void *argp)
|
{
|
{
|
td_thrinfo_t ti;
|
td_thrinfo_t ti;
|
td_err_e err;
|
td_err_e err;
|
ptid_t thread_ptid;
|
ptid_t thread_ptid;
|
struct thread_get_info_inout *inout;
|
struct thread_get_info_inout *inout;
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
|
|
inout = argp;
|
inout = argp;
|
info = inout->thread_db_info;
|
info = inout->thread_db_info;
|
|
|
err = info->td_thr_get_info_p (thp, &ti);
|
err = info->td_thr_get_info_p (thp, &ti);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
error (_("thread_get_info_callback: cannot get thread info: %s"),
|
error (_("thread_get_info_callback: cannot get thread info: %s"),
|
thread_db_err_str (err));
|
thread_db_err_str (err));
|
|
|
/* Fill the cache. */
|
/* Fill the cache. */
|
thread_ptid = ptid_build (info->pid, ti.ti_lid, 0);
|
thread_ptid = ptid_build (info->pid, ti.ti_lid, 0);
|
inout->thread_info = find_thread_ptid (thread_ptid);
|
inout->thread_info = find_thread_ptid (thread_ptid);
|
|
|
/* In the case of a zombie thread, don't continue. We don't want to
|
/* In the case of a zombie thread, don't continue. We don't want to
|
attach to it thinking it is a new thread. */
|
attach to it thinking it is a new thread. */
|
if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
|
if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
|
return TD_THR_ZOMBIE;
|
return TD_THR_ZOMBIE;
|
|
|
if (inout->thread_info == NULL)
|
if (inout->thread_info == NULL)
|
{
|
{
|
/* New thread. Attach to it now (why wait?). */
|
/* New thread. Attach to it now (why wait?). */
|
if (!have_threads (thread_ptid))
|
if (!have_threads (thread_ptid))
|
thread_db_find_new_threads_1 (thread_ptid);
|
thread_db_find_new_threads_1 (thread_ptid);
|
else
|
else
|
attach_thread (thread_ptid, thp, &ti);
|
attach_thread (thread_ptid, thp, &ti);
|
inout->thread_info = find_thread_ptid (thread_ptid);
|
inout->thread_info = find_thread_ptid (thread_ptid);
|
gdb_assert (inout->thread_info != NULL);
|
gdb_assert (inout->thread_info != NULL);
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Convert between user-level thread ids and LWP ids. */
|
/* Convert between user-level thread ids and LWP ids. */
|
|
|
static ptid_t
|
static ptid_t
|
thread_from_lwp (ptid_t ptid)
|
thread_from_lwp (ptid_t ptid)
|
{
|
{
|
td_thrhandle_t th;
|
td_thrhandle_t th;
|
td_err_e err;
|
td_err_e err;
|
ptid_t thread_ptid;
|
ptid_t thread_ptid;
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
struct thread_get_info_inout io = {0};
|
struct thread_get_info_inout io = {0};
|
|
|
/* This ptid comes from linux-nat.c, which should always fill in the
|
/* This ptid comes from linux-nat.c, which should always fill in the
|
LWP. */
|
LWP. */
|
gdb_assert (GET_LWP (ptid) != 0);
|
gdb_assert (GET_LWP (ptid) != 0);
|
|
|
info = get_thread_db_info (GET_PID (ptid));
|
info = get_thread_db_info (GET_PID (ptid));
|
|
|
/* Access an lwp we know is stopped. */
|
/* Access an lwp we know is stopped. */
|
info->proc_handle.ptid = ptid;
|
info->proc_handle.ptid = ptid;
|
err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th);
|
err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
error (_("Cannot find user-level thread for LWP %ld: %s"),
|
error (_("Cannot find user-level thread for LWP %ld: %s"),
|
GET_LWP (ptid), thread_db_err_str (err));
|
GET_LWP (ptid), thread_db_err_str (err));
|
|
|
/* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the
|
/* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the
|
event thread has already died. If another gdb interface has called
|
event thread has already died. If another gdb interface has called
|
thread_alive() previously, the thread won't be found on the thread list
|
thread_alive() previously, the thread won't be found on the thread list
|
anymore. In that case, we don't want to process this ptid anymore
|
anymore. In that case, we don't want to process this ptid anymore
|
to avoid the possibility of later treating it as a newly
|
to avoid the possibility of later treating it as a newly
|
discovered thread id that we should add to the list. Thus,
|
discovered thread id that we should add to the list. Thus,
|
we return a -1 ptid which is also how the thread list marks a
|
we return a -1 ptid which is also how the thread list marks a
|
dead thread. */
|
dead thread. */
|
io.thread_db_info = info;
|
io.thread_db_info = info;
|
io.thread_info = NULL;
|
io.thread_info = NULL;
|
if (thread_get_info_callback (&th, &io) == TD_THR_ZOMBIE
|
if (thread_get_info_callback (&th, &io) == TD_THR_ZOMBIE
|
&& io.thread_info == NULL)
|
&& io.thread_info == NULL)
|
return minus_one_ptid;
|
return minus_one_ptid;
|
|
|
gdb_assert (ptid_get_tid (ptid) == 0);
|
gdb_assert (ptid_get_tid (ptid) == 0);
|
return ptid;
|
return ptid;
|
}
|
}
|
|
|
|
|
/* Attach to lwp PTID, doing whatever else is required to have this
|
/* Attach to lwp PTID, doing whatever else is required to have this
|
LWP under the debugger's control --- e.g., enabling event
|
LWP under the debugger's control --- e.g., enabling event
|
reporting. Returns true on success. */
|
reporting. Returns true on success. */
|
int
|
int
|
thread_db_attach_lwp (ptid_t ptid)
|
thread_db_attach_lwp (ptid_t ptid)
|
{
|
{
|
td_thrhandle_t th;
|
td_thrhandle_t th;
|
td_thrinfo_t ti;
|
td_thrinfo_t ti;
|
td_err_e err;
|
td_err_e err;
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
|
|
info = get_thread_db_info (GET_PID (ptid));
|
info = get_thread_db_info (GET_PID (ptid));
|
|
|
if (info == NULL)
|
if (info == NULL)
|
return 0;
|
return 0;
|
|
|
/* This ptid comes from linux-nat.c, which should always fill in the
|
/* This ptid comes from linux-nat.c, which should always fill in the
|
LWP. */
|
LWP. */
|
gdb_assert (GET_LWP (ptid) != 0);
|
gdb_assert (GET_LWP (ptid) != 0);
|
|
|
/* Access an lwp we know is stopped. */
|
/* Access an lwp we know is stopped. */
|
info->proc_handle.ptid = ptid;
|
info->proc_handle.ptid = ptid;
|
|
|
/* If we have only looked at the first thread before libpthread was
|
/* If we have only looked at the first thread before libpthread was
|
initialized, we may not know its thread ID yet. Make sure we do
|
initialized, we may not know its thread ID yet. Make sure we do
|
before we add another thread to the list. */
|
before we add another thread to the list. */
|
if (!have_threads (ptid))
|
if (!have_threads (ptid))
|
thread_db_find_new_threads_1 (ptid);
|
thread_db_find_new_threads_1 (ptid);
|
|
|
err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th);
|
err = info->td_ta_map_lwp2thr_p (info->thread_agent, GET_LWP (ptid), &th);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
/* Cannot find user-level thread. */
|
/* Cannot find user-level thread. */
|
return 0;
|
return 0;
|
|
|
err = info->td_thr_get_info_p (&th, &ti);
|
err = info->td_thr_get_info_p (&th, &ti);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
{
|
{
|
warning (_("Cannot get thread info: %s"), thread_db_err_str (err));
|
warning (_("Cannot get thread info: %s"), thread_db_err_str (err));
|
return 0;
|
return 0;
|
}
|
}
|
|
|
attach_thread (ptid, &th, &ti);
|
attach_thread (ptid, &th, &ti);
|
return 1;
|
return 1;
|
}
|
}
|
|
|
static void *
|
static void *
|
verbose_dlsym (void *handle, const char *name)
|
verbose_dlsym (void *handle, const char *name)
|
{
|
{
|
void *sym = dlsym (handle, name);
|
void *sym = dlsym (handle, name);
|
if (sym == NULL)
|
if (sym == NULL)
|
warning (_("Symbol \"%s\" not found in libthread_db: %s"), name, dlerror ());
|
warning (_("Symbol \"%s\" not found in libthread_db: %s"), name, dlerror ());
|
return sym;
|
return sym;
|
}
|
}
|
|
|
static td_err_e
|
static td_err_e
|
enable_thread_event (int event, CORE_ADDR *bp)
|
enable_thread_event (int event, CORE_ADDR *bp)
|
{
|
{
|
td_notify_t notify;
|
td_notify_t notify;
|
td_err_e err;
|
td_err_e err;
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
|
|
info = get_thread_db_info (GET_PID (inferior_ptid));
|
info = get_thread_db_info (GET_PID (inferior_ptid));
|
|
|
/* Access an lwp we know is stopped. */
|
/* Access an lwp we know is stopped. */
|
info->proc_handle.ptid = inferior_ptid;
|
info->proc_handle.ptid = inferior_ptid;
|
|
|
/* Get the breakpoint address for thread EVENT. */
|
/* Get the breakpoint address for thread EVENT. */
|
err = info->td_ta_event_addr_p (info->thread_agent, event, ¬ify);
|
err = info->td_ta_event_addr_p (info->thread_agent, event, ¬ify);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
return err;
|
return err;
|
|
|
/* Set up the breakpoint. */
|
/* Set up the breakpoint. */
|
gdb_assert (exec_bfd);
|
gdb_assert (exec_bfd);
|
(*bp) = (gdbarch_convert_from_func_ptr_addr
|
(*bp) = (gdbarch_convert_from_func_ptr_addr
|
(target_gdbarch,
|
(target_gdbarch,
|
/* Do proper sign extension for the target. */
|
/* Do proper sign extension for the target. */
|
(bfd_get_sign_extend_vma (exec_bfd) > 0
|
(bfd_get_sign_extend_vma (exec_bfd) > 0
|
? (CORE_ADDR) (intptr_t) notify.u.bptaddr
|
? (CORE_ADDR) (intptr_t) notify.u.bptaddr
|
: (CORE_ADDR) (uintptr_t) notify.u.bptaddr),
|
: (CORE_ADDR) (uintptr_t) notify.u.bptaddr),
|
¤t_target));
|
¤t_target));
|
create_thread_event_breakpoint (target_gdbarch, *bp);
|
create_thread_event_breakpoint (target_gdbarch, *bp);
|
|
|
return TD_OK;
|
return TD_OK;
|
}
|
}
|
|
|
static void
|
static void
|
enable_thread_event_reporting (void)
|
enable_thread_event_reporting (void)
|
{
|
{
|
td_thr_events_t events;
|
td_thr_events_t events;
|
td_notify_t notify;
|
td_notify_t notify;
|
td_err_e err;
|
td_err_e err;
|
#ifdef HAVE_GNU_LIBC_VERSION_H
|
#ifdef HAVE_GNU_LIBC_VERSION_H
|
const char *libc_version;
|
const char *libc_version;
|
int libc_major, libc_minor;
|
int libc_major, libc_minor;
|
#endif
|
#endif
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
|
|
info = get_thread_db_info (GET_PID (inferior_ptid));
|
info = get_thread_db_info (GET_PID (inferior_ptid));
|
|
|
/* We cannot use the thread event reporting facility if these
|
/* We cannot use the thread event reporting facility if these
|
functions aren't available. */
|
functions aren't available. */
|
if (info->td_ta_event_addr_p == NULL
|
if (info->td_ta_event_addr_p == NULL
|
|| info->td_ta_set_event_p == NULL
|
|| info->td_ta_set_event_p == NULL
|
|| info->td_ta_event_getmsg_p == NULL
|
|| info->td_ta_event_getmsg_p == NULL
|
|| info->td_thr_event_enable_p == NULL)
|
|| info->td_thr_event_enable_p == NULL)
|
return;
|
return;
|
|
|
/* Set the process wide mask saying which events we're interested in. */
|
/* Set the process wide mask saying which events we're interested in. */
|
td_event_emptyset (&events);
|
td_event_emptyset (&events);
|
td_event_addset (&events, TD_CREATE);
|
td_event_addset (&events, TD_CREATE);
|
|
|
#ifdef HAVE_GNU_LIBC_VERSION_H
|
#ifdef HAVE_GNU_LIBC_VERSION_H
|
/* The event reporting facility is broken for TD_DEATH events in
|
/* The event reporting facility is broken for TD_DEATH events in
|
glibc 2.1.3, so don't enable it if we have glibc but a lower
|
glibc 2.1.3, so don't enable it if we have glibc but a lower
|
version. */
|
version. */
|
libc_version = gnu_get_libc_version ();
|
libc_version = gnu_get_libc_version ();
|
if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2
|
if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2
|
&& (libc_major > 2 || (libc_major == 2 && libc_minor > 1)))
|
&& (libc_major > 2 || (libc_major == 2 && libc_minor > 1)))
|
#endif
|
#endif
|
td_event_addset (&events, TD_DEATH);
|
td_event_addset (&events, TD_DEATH);
|
|
|
err = info->td_ta_set_event_p (info->thread_agent, &events);
|
err = info->td_ta_set_event_p (info->thread_agent, &events);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
{
|
{
|
warning (_("Unable to set global thread event mask: %s"),
|
warning (_("Unable to set global thread event mask: %s"),
|
thread_db_err_str (err));
|
thread_db_err_str (err));
|
return;
|
return;
|
}
|
}
|
|
|
/* Delete previous thread event breakpoints, if any. */
|
/* Delete previous thread event breakpoints, if any. */
|
remove_thread_event_breakpoints ();
|
remove_thread_event_breakpoints ();
|
info->td_create_bp_addr = 0;
|
info->td_create_bp_addr = 0;
|
info->td_death_bp_addr = 0;
|
info->td_death_bp_addr = 0;
|
|
|
/* Set up the thread creation event. */
|
/* Set up the thread creation event. */
|
err = enable_thread_event (TD_CREATE, &info->td_create_bp_addr);
|
err = enable_thread_event (TD_CREATE, &info->td_create_bp_addr);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
{
|
{
|
warning (_("Unable to get location for thread creation breakpoint: %s"),
|
warning (_("Unable to get location for thread creation breakpoint: %s"),
|
thread_db_err_str (err));
|
thread_db_err_str (err));
|
return;
|
return;
|
}
|
}
|
|
|
/* Set up the thread death event. */
|
/* Set up the thread death event. */
|
err = enable_thread_event (TD_DEATH, &info->td_death_bp_addr);
|
err = enable_thread_event (TD_DEATH, &info->td_death_bp_addr);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
{
|
{
|
warning (_("Unable to get location for thread death breakpoint: %s"),
|
warning (_("Unable to get location for thread death breakpoint: %s"),
|
thread_db_err_str (err));
|
thread_db_err_str (err));
|
return;
|
return;
|
}
|
}
|
}
|
}
|
|
|
/* Same as thread_db_find_new_threads_1, but silently ignore errors. */
|
/* Same as thread_db_find_new_threads_1, but silently ignore errors. */
|
|
|
static void
|
static void
|
thread_db_find_new_threads_silently (ptid_t ptid)
|
thread_db_find_new_threads_silently (ptid_t ptid)
|
{
|
{
|
volatile struct gdb_exception except;
|
volatile struct gdb_exception except;
|
|
|
TRY_CATCH (except, RETURN_MASK_ERROR)
|
TRY_CATCH (except, RETURN_MASK_ERROR)
|
{
|
{
|
thread_db_find_new_threads_2 (ptid, 1);
|
thread_db_find_new_threads_2 (ptid, 1);
|
}
|
}
|
|
|
if (except.reason < 0 && info_verbose)
|
if (except.reason < 0 && info_verbose)
|
{
|
{
|
exception_fprintf (gdb_stderr, except,
|
exception_fprintf (gdb_stderr, except,
|
"Warning: thread_db_find_new_threads_silently: ");
|
"Warning: thread_db_find_new_threads_silently: ");
|
}
|
}
|
}
|
}
|
|
|
/* Lookup a library in which given symbol resides.
|
/* Lookup a library in which given symbol resides.
|
Note: this is looking in GDB process, not in the inferior.
|
Note: this is looking in GDB process, not in the inferior.
|
Returns library name, or NULL. */
|
Returns library name, or NULL. */
|
|
|
static const char *
|
static const char *
|
dladdr_to_soname (const void *addr)
|
dladdr_to_soname (const void *addr)
|
{
|
{
|
Dl_info info;
|
Dl_info info;
|
|
|
if (dladdr (addr, &info) != 0)
|
if (dladdr (addr, &info) != 0)
|
return info.dli_fname;
|
return info.dli_fname;
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/* Attempt to initialize dlopen()ed libthread_db, described by HANDLE.
|
/* Attempt to initialize dlopen()ed libthread_db, described by HANDLE.
|
Return 1 on success.
|
Return 1 on success.
|
Failure could happen if libthread_db does not have symbols we expect,
|
Failure could happen if libthread_db does not have symbols we expect,
|
or when it refuses to work with the current inferior (e.g. due to
|
or when it refuses to work with the current inferior (e.g. due to
|
version mismatch between libthread_db and libpthread). */
|
version mismatch between libthread_db and libpthread). */
|
|
|
static int
|
static int
|
try_thread_db_load_1 (struct thread_db_info *info)
|
try_thread_db_load_1 (struct thread_db_info *info)
|
{
|
{
|
td_err_e err;
|
td_err_e err;
|
|
|
/* Initialize pointers to the dynamic library functions we will use.
|
/* Initialize pointers to the dynamic library functions we will use.
|
Essential functions first. */
|
Essential functions first. */
|
|
|
info->td_init_p = verbose_dlsym (info->handle, "td_init");
|
info->td_init_p = verbose_dlsym (info->handle, "td_init");
|
if (info->td_init_p == NULL)
|
if (info->td_init_p == NULL)
|
return 0;
|
return 0;
|
|
|
err = info->td_init_p ();
|
err = info->td_init_p ();
|
if (err != TD_OK)
|
if (err != TD_OK)
|
{
|
{
|
warning (_("Cannot initialize libthread_db: %s"), thread_db_err_str (err));
|
warning (_("Cannot initialize libthread_db: %s"), thread_db_err_str (err));
|
return 0;
|
return 0;
|
}
|
}
|
|
|
info->td_ta_new_p = verbose_dlsym (info->handle, "td_ta_new");
|
info->td_ta_new_p = verbose_dlsym (info->handle, "td_ta_new");
|
if (info->td_ta_new_p == NULL)
|
if (info->td_ta_new_p == NULL)
|
return 0;
|
return 0;
|
|
|
/* Initialize the structure that identifies the child process. */
|
/* Initialize the structure that identifies the child process. */
|
info->proc_handle.ptid = inferior_ptid;
|
info->proc_handle.ptid = inferior_ptid;
|
|
|
/* Now attempt to open a connection to the thread library. */
|
/* Now attempt to open a connection to the thread library. */
|
err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent);
|
err = info->td_ta_new_p (&info->proc_handle, &info->thread_agent);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
{
|
{
|
if (info_verbose)
|
if (info_verbose)
|
printf_unfiltered (_("td_ta_new failed: %s\n"),
|
printf_unfiltered (_("td_ta_new failed: %s\n"),
|
thread_db_err_str (err));
|
thread_db_err_str (err));
|
else
|
else
|
switch (err)
|
switch (err)
|
{
|
{
|
case TD_NOLIBTHREAD:
|
case TD_NOLIBTHREAD:
|
#ifdef THREAD_DB_HAS_TD_VERSION
|
#ifdef THREAD_DB_HAS_TD_VERSION
|
case TD_VERSION:
|
case TD_VERSION:
|
#endif
|
#endif
|
/* The errors above are not unexpected and silently ignored:
|
/* The errors above are not unexpected and silently ignored:
|
they just mean we haven't found correct version of
|
they just mean we haven't found correct version of
|
libthread_db yet. */
|
libthread_db yet. */
|
break;
|
break;
|
default:
|
default:
|
warning (_("td_ta_new failed: %s"), thread_db_err_str (err));
|
warning (_("td_ta_new failed: %s"), thread_db_err_str (err));
|
}
|
}
|
return 0;
|
return 0;
|
}
|
}
|
|
|
info->td_ta_map_id2thr_p = verbose_dlsym (info->handle, "td_ta_map_id2thr");
|
info->td_ta_map_id2thr_p = verbose_dlsym (info->handle, "td_ta_map_id2thr");
|
if (info->td_ta_map_id2thr_p == NULL)
|
if (info->td_ta_map_id2thr_p == NULL)
|
return 0;
|
return 0;
|
|
|
info->td_ta_map_lwp2thr_p = verbose_dlsym (info->handle, "td_ta_map_lwp2thr");
|
info->td_ta_map_lwp2thr_p = verbose_dlsym (info->handle, "td_ta_map_lwp2thr");
|
if (info->td_ta_map_lwp2thr_p == NULL)
|
if (info->td_ta_map_lwp2thr_p == NULL)
|
return 0;
|
return 0;
|
|
|
info->td_ta_thr_iter_p = verbose_dlsym (info->handle, "td_ta_thr_iter");
|
info->td_ta_thr_iter_p = verbose_dlsym (info->handle, "td_ta_thr_iter");
|
if (info->td_ta_thr_iter_p == NULL)
|
if (info->td_ta_thr_iter_p == NULL)
|
return 0;
|
return 0;
|
|
|
info->td_thr_validate_p = verbose_dlsym (info->handle, "td_thr_validate");
|
info->td_thr_validate_p = verbose_dlsym (info->handle, "td_thr_validate");
|
if (info->td_thr_validate_p == NULL)
|
if (info->td_thr_validate_p == NULL)
|
return 0;
|
return 0;
|
|
|
info->td_thr_get_info_p = verbose_dlsym (info->handle, "td_thr_get_info");
|
info->td_thr_get_info_p = verbose_dlsym (info->handle, "td_thr_get_info");
|
if (info->td_thr_get_info_p == NULL)
|
if (info->td_thr_get_info_p == NULL)
|
return 0;
|
return 0;
|
|
|
/* These are not essential. */
|
/* These are not essential. */
|
info->td_ta_event_addr_p = dlsym (info->handle, "td_ta_event_addr");
|
info->td_ta_event_addr_p = dlsym (info->handle, "td_ta_event_addr");
|
info->td_ta_set_event_p = dlsym (info->handle, "td_ta_set_event");
|
info->td_ta_set_event_p = dlsym (info->handle, "td_ta_set_event");
|
info->td_ta_clear_event_p = dlsym (info->handle, "td_ta_clear_event");
|
info->td_ta_clear_event_p = dlsym (info->handle, "td_ta_clear_event");
|
info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg");
|
info->td_ta_event_getmsg_p = dlsym (info->handle, "td_ta_event_getmsg");
|
info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable");
|
info->td_thr_event_enable_p = dlsym (info->handle, "td_thr_event_enable");
|
info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr");
|
info->td_thr_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr");
|
|
|
printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n"));
|
printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n"));
|
|
|
if (info_verbose || *libthread_db_search_path)
|
if (info_verbose || *libthread_db_search_path)
|
{
|
{
|
const char *library;
|
const char *library;
|
|
|
library = dladdr_to_soname (*info->td_ta_new_p);
|
library = dladdr_to_soname (*info->td_ta_new_p);
|
if (library == NULL)
|
if (library == NULL)
|
library = LIBTHREAD_DB_SO;
|
library = LIBTHREAD_DB_SO;
|
|
|
printf_unfiltered (_("Using host libthread_db library \"%s\".\n"),
|
printf_unfiltered (_("Using host libthread_db library \"%s\".\n"),
|
library);
|
library);
|
}
|
}
|
|
|
/* The thread library was detected. Activate the thread_db target
|
/* The thread library was detected. Activate the thread_db target
|
if this is the first process using it. */
|
if this is the first process using it. */
|
if (thread_db_list->next == NULL)
|
if (thread_db_list->next == NULL)
|
push_target (&thread_db_ops);
|
push_target (&thread_db_ops);
|
|
|
enable_thread_event_reporting ();
|
enable_thread_event_reporting ();
|
|
|
/* There appears to be a bug in glibc-2.3.6: calls to td_thr_get_info fail
|
/* There appears to be a bug in glibc-2.3.6: calls to td_thr_get_info fail
|
with TD_ERR for statically linked executables if td_thr_get_info is
|
with TD_ERR for statically linked executables if td_thr_get_info is
|
called before glibc has initialized itself. Silently ignore such
|
called before glibc has initialized itself. Silently ignore such
|
errors, and let gdb enumerate threads again later. */
|
errors, and let gdb enumerate threads again later. */
|
thread_db_find_new_threads_silently (inferior_ptid);
|
thread_db_find_new_threads_silently (inferior_ptid);
|
|
|
return 1;
|
return 1;
|
}
|
}
|
|
|
/* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute,
|
/* Attempt to use LIBRARY as libthread_db. LIBRARY could be absolute,
|
relative, or just LIBTHREAD_DB. */
|
relative, or just LIBTHREAD_DB. */
|
|
|
static int
|
static int
|
try_thread_db_load (const char *library)
|
try_thread_db_load (const char *library)
|
{
|
{
|
void *handle;
|
void *handle;
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
|
|
if (info_verbose)
|
if (info_verbose)
|
printf_unfiltered (_("Trying host libthread_db library: %s.\n"),
|
printf_unfiltered (_("Trying host libthread_db library: %s.\n"),
|
library);
|
library);
|
handle = dlopen (library, RTLD_NOW);
|
handle = dlopen (library, RTLD_NOW);
|
if (handle == NULL)
|
if (handle == NULL)
|
{
|
{
|
if (info_verbose)
|
if (info_verbose)
|
printf_unfiltered (_("dlopen failed: %s.\n"), dlerror ());
|
printf_unfiltered (_("dlopen failed: %s.\n"), dlerror ());
|
return 0;
|
return 0;
|
}
|
}
|
|
|
if (info_verbose && strchr (library, '/') == NULL)
|
if (info_verbose && strchr (library, '/') == NULL)
|
{
|
{
|
void *td_init;
|
void *td_init;
|
|
|
td_init = dlsym (handle, "td_init");
|
td_init = dlsym (handle, "td_init");
|
if (td_init != NULL)
|
if (td_init != NULL)
|
{
|
{
|
const char *const libpath = dladdr_to_soname (td_init);
|
const char *const libpath = dladdr_to_soname (td_init);
|
|
|
if (libpath != NULL)
|
if (libpath != NULL)
|
printf_unfiltered (_("Host %s resolved to: %s.\n"),
|
printf_unfiltered (_("Host %s resolved to: %s.\n"),
|
library, libpath);
|
library, libpath);
|
}
|
}
|
}
|
}
|
|
|
info = add_thread_db_info (handle);
|
info = add_thread_db_info (handle);
|
|
|
if (try_thread_db_load_1 (info))
|
if (try_thread_db_load_1 (info))
|
return 1;
|
return 1;
|
|
|
/* This library "refused" to work on current inferior. */
|
/* This library "refused" to work on current inferior. */
|
delete_thread_db_info (GET_PID (inferior_ptid));
|
delete_thread_db_info (GET_PID (inferior_ptid));
|
return 0;
|
return 0;
|
}
|
}
|
|
|
|
|
/* Search libthread_db_search_path for libthread_db which "agrees"
|
/* Search libthread_db_search_path for libthread_db which "agrees"
|
to work on current inferior. */
|
to work on current inferior. */
|
|
|
static int
|
static int
|
thread_db_load_search (void)
|
thread_db_load_search (void)
|
{
|
{
|
char path[PATH_MAX];
|
char path[PATH_MAX];
|
const char *search_path = libthread_db_search_path;
|
const char *search_path = libthread_db_search_path;
|
int rc = 0;
|
int rc = 0;
|
|
|
while (*search_path)
|
while (*search_path)
|
{
|
{
|
const char *end = strchr (search_path, ':');
|
const char *end = strchr (search_path, ':');
|
if (end)
|
if (end)
|
{
|
{
|
size_t len = end - search_path;
|
size_t len = end - search_path;
|
if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path))
|
if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path))
|
{
|
{
|
char *cp = xmalloc (len + 1);
|
char *cp = xmalloc (len + 1);
|
memcpy (cp, search_path, len);
|
memcpy (cp, search_path, len);
|
cp[len] = '\0';
|
cp[len] = '\0';
|
warning (_("libthread_db_search_path component too long,"
|
warning (_("libthread_db_search_path component too long,"
|
" ignored: %s."), cp);
|
" ignored: %s."), cp);
|
xfree (cp);
|
xfree (cp);
|
search_path += len + 1;
|
search_path += len + 1;
|
continue;
|
continue;
|
}
|
}
|
memcpy (path, search_path, len);
|
memcpy (path, search_path, len);
|
path[len] = '\0';
|
path[len] = '\0';
|
search_path += len + 1;
|
search_path += len + 1;
|
}
|
}
|
else
|
else
|
{
|
{
|
size_t len = strlen (search_path);
|
size_t len = strlen (search_path);
|
|
|
if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path))
|
if (len + 1 + strlen (LIBTHREAD_DB_SO) + 1 > sizeof (path))
|
{
|
{
|
warning (_("libthread_db_search_path component too long,"
|
warning (_("libthread_db_search_path component too long,"
|
" ignored: %s."), search_path);
|
" ignored: %s."), search_path);
|
break;
|
break;
|
}
|
}
|
memcpy (path, search_path, len + 1);
|
memcpy (path, search_path, len + 1);
|
search_path += len;
|
search_path += len;
|
}
|
}
|
strcat (path, "/");
|
strcat (path, "/");
|
strcat (path, LIBTHREAD_DB_SO);
|
strcat (path, LIBTHREAD_DB_SO);
|
if (try_thread_db_load (path))
|
if (try_thread_db_load (path))
|
{
|
{
|
rc = 1;
|
rc = 1;
|
break;
|
break;
|
}
|
}
|
}
|
}
|
if (rc == 0)
|
if (rc == 0)
|
rc = try_thread_db_load (LIBTHREAD_DB_SO);
|
rc = try_thread_db_load (LIBTHREAD_DB_SO);
|
return rc;
|
return rc;
|
}
|
}
|
|
|
/* Attempt to load and initialize libthread_db.
|
/* Attempt to load and initialize libthread_db.
|
Return 1 on success.
|
Return 1 on success.
|
*/
|
*/
|
|
|
static int
|
static int
|
thread_db_load (void)
|
thread_db_load (void)
|
{
|
{
|
struct objfile *obj;
|
struct objfile *obj;
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
|
|
info = get_thread_db_info (GET_PID (inferior_ptid));
|
info = get_thread_db_info (GET_PID (inferior_ptid));
|
|
|
if (info != NULL)
|
if (info != NULL)
|
return 1;
|
return 1;
|
|
|
/* Don't attempt to use thread_db on targets which can not run
|
/* Don't attempt to use thread_db on targets which can not run
|
(executables not running yet, core files) for now. */
|
(executables not running yet, core files) for now. */
|
if (!target_has_execution)
|
if (!target_has_execution)
|
return 0;
|
return 0;
|
|
|
/* Don't attempt to use thread_db for remote targets. */
|
/* Don't attempt to use thread_db for remote targets. */
|
if (!target_can_run (¤t_target))
|
if (!target_can_run (¤t_target))
|
return 0;
|
return 0;
|
|
|
if (thread_db_load_search ())
|
if (thread_db_load_search ())
|
return 1;
|
return 1;
|
|
|
/* None of the libthread_db's on our search path, not the system default
|
/* None of the libthread_db's on our search path, not the system default
|
ones worked. If the executable is dynamically linked against
|
ones worked. If the executable is dynamically linked against
|
libpthread, try loading libthread_db from the same directory. */
|
libpthread, try loading libthread_db from the same directory. */
|
|
|
ALL_OBJFILES (obj)
|
ALL_OBJFILES (obj)
|
if (libpthread_name_p (obj->name))
|
if (libpthread_name_p (obj->name))
|
{
|
{
|
char path[PATH_MAX], *cp;
|
char path[PATH_MAX], *cp;
|
|
|
gdb_assert (strlen (obj->name) < sizeof (path));
|
gdb_assert (strlen (obj->name) < sizeof (path));
|
strcpy (path, obj->name);
|
strcpy (path, obj->name);
|
cp = strrchr (path, '/');
|
cp = strrchr (path, '/');
|
|
|
if (cp == NULL)
|
if (cp == NULL)
|
{
|
{
|
warning (_("Expected absolute pathname for libpthread in the"
|
warning (_("Expected absolute pathname for libpthread in the"
|
" inferior, but got %s."), path);
|
" inferior, but got %s."), path);
|
}
|
}
|
else if (cp + 1 + strlen (LIBTHREAD_DB_SO) + 1 > path + sizeof (path))
|
else if (cp + 1 + strlen (LIBTHREAD_DB_SO) + 1 > path + sizeof (path))
|
{
|
{
|
warning (_("Unexpected: path to libpthread in the inferior is"
|
warning (_("Unexpected: path to libpthread in the inferior is"
|
" too long: %s"), path);
|
" too long: %s"), path);
|
}
|
}
|
else
|
else
|
{
|
{
|
strcpy (cp + 1, LIBTHREAD_DB_SO);
|
strcpy (cp + 1, LIBTHREAD_DB_SO);
|
if (try_thread_db_load (path))
|
if (try_thread_db_load (path))
|
return 1;
|
return 1;
|
}
|
}
|
warning (_("Unable to find libthread_db matching inferior's thread"
|
warning (_("Unable to find libthread_db matching inferior's thread"
|
" library, thread debugging will not be available."));
|
" library, thread debugging will not be available."));
|
return 0;
|
return 0;
|
}
|
}
|
/* Either this executable isn't using libpthread at all, or it is
|
/* Either this executable isn't using libpthread at all, or it is
|
statically linked. Since we can't easily distinguish these two cases,
|
statically linked. Since we can't easily distinguish these two cases,
|
no warning is issued. */
|
no warning is issued. */
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void
|
static void
|
disable_thread_event_reporting (struct thread_db_info *info)
|
disable_thread_event_reporting (struct thread_db_info *info)
|
{
|
{
|
if (info->td_ta_clear_event_p != NULL)
|
if (info->td_ta_clear_event_p != NULL)
|
{
|
{
|
td_thr_events_t events;
|
td_thr_events_t events;
|
|
|
/* Set the process wide mask saying we aren't interested in any
|
/* Set the process wide mask saying we aren't interested in any
|
events anymore. */
|
events anymore. */
|
td_event_fillset (&events);
|
td_event_fillset (&events);
|
info->td_ta_clear_event_p (info->thread_agent, &events);
|
info->td_ta_clear_event_p (info->thread_agent, &events);
|
}
|
}
|
|
|
info->td_create_bp_addr = 0;
|
info->td_create_bp_addr = 0;
|
info->td_death_bp_addr = 0;
|
info->td_death_bp_addr = 0;
|
}
|
}
|
|
|
static void
|
static void
|
check_thread_signals (void)
|
check_thread_signals (void)
|
{
|
{
|
#ifdef GET_THREAD_SIGNALS
|
#ifdef GET_THREAD_SIGNALS
|
if (!thread_signals)
|
if (!thread_signals)
|
{
|
{
|
sigset_t mask;
|
sigset_t mask;
|
int i;
|
int i;
|
|
|
GET_THREAD_SIGNALS (&mask);
|
GET_THREAD_SIGNALS (&mask);
|
sigemptyset (&thread_stop_set);
|
sigemptyset (&thread_stop_set);
|
sigemptyset (&thread_print_set);
|
sigemptyset (&thread_print_set);
|
|
|
for (i = 1; i < NSIG; i++)
|
for (i = 1; i < NSIG; i++)
|
{
|
{
|
if (sigismember (&mask, i))
|
if (sigismember (&mask, i))
|
{
|
{
|
if (signal_stop_update (target_signal_from_host (i), 0))
|
if (signal_stop_update (target_signal_from_host (i), 0))
|
sigaddset (&thread_stop_set, i);
|
sigaddset (&thread_stop_set, i);
|
if (signal_print_update (target_signal_from_host (i), 0))
|
if (signal_print_update (target_signal_from_host (i), 0))
|
sigaddset (&thread_print_set, i);
|
sigaddset (&thread_print_set, i);
|
thread_signals = 1;
|
thread_signals = 1;
|
}
|
}
|
}
|
}
|
}
|
}
|
#endif
|
#endif
|
}
|
}
|
|
|
/* Check whether thread_db is usable. This function is called when
|
/* Check whether thread_db is usable. This function is called when
|
an inferior is created (or otherwise acquired, e.g. attached to)
|
an inferior is created (or otherwise acquired, e.g. attached to)
|
and when new shared libraries are loaded into a running process. */
|
and when new shared libraries are loaded into a running process. */
|
|
|
void
|
void
|
check_for_thread_db (void)
|
check_for_thread_db (void)
|
{
|
{
|
td_err_e err;
|
td_err_e err;
|
static void *last_loaded;
|
static void *last_loaded;
|
|
|
/* Do nothing if we couldn't load libthread_db.so.1. */
|
/* Do nothing if we couldn't load libthread_db.so.1. */
|
if (!thread_db_load ())
|
if (!thread_db_load ())
|
return;
|
return;
|
}
|
}
|
|
|
static void
|
static void
|
thread_db_new_objfile (struct objfile *objfile)
|
thread_db_new_objfile (struct objfile *objfile)
|
{
|
{
|
/* This observer must always be called with inferior_ptid set
|
/* This observer must always be called with inferior_ptid set
|
correctly. */
|
correctly. */
|
|
|
if (objfile != NULL)
|
if (objfile != NULL)
|
check_for_thread_db ();
|
check_for_thread_db ();
|
}
|
}
|
|
|
/* Attach to a new thread. This function is called when we receive a
|
/* Attach to a new thread. This function is called when we receive a
|
TD_CREATE event or when we iterate over all threads and find one
|
TD_CREATE event or when we iterate over all threads and find one
|
that wasn't already in our list. Returns true on success. */
|
that wasn't already in our list. Returns true on success. */
|
|
|
static int
|
static int
|
attach_thread (ptid_t ptid, const td_thrhandle_t *th_p,
|
attach_thread (ptid_t ptid, const td_thrhandle_t *th_p,
|
const td_thrinfo_t *ti_p)
|
const td_thrinfo_t *ti_p)
|
{
|
{
|
struct private_thread_info *private;
|
struct private_thread_info *private;
|
struct thread_info *tp = NULL;
|
struct thread_info *tp = NULL;
|
td_err_e err;
|
td_err_e err;
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
|
|
/* If we're being called after a TD_CREATE event, we may already
|
/* If we're being called after a TD_CREATE event, we may already
|
know about this thread. There are two ways this can happen. We
|
know about this thread. There are two ways this can happen. We
|
may have iterated over all threads between the thread creation
|
may have iterated over all threads between the thread creation
|
and the TD_CREATE event, for instance when the user has issued
|
and the TD_CREATE event, for instance when the user has issued
|
the `info threads' command before the SIGTRAP for hitting the
|
the `info threads' command before the SIGTRAP for hitting the
|
thread creation breakpoint was reported. Alternatively, the
|
thread creation breakpoint was reported. Alternatively, the
|
thread may have exited and a new one been created with the same
|
thread may have exited and a new one been created with the same
|
thread ID. In the first case we don't need to do anything; in
|
thread ID. In the first case we don't need to do anything; in
|
the second case we should discard information about the dead
|
the second case we should discard information about the dead
|
thread and attach to the new one. */
|
thread and attach to the new one. */
|
if (in_thread_list (ptid))
|
if (in_thread_list (ptid))
|
{
|
{
|
tp = find_thread_ptid (ptid);
|
tp = find_thread_ptid (ptid);
|
gdb_assert (tp != NULL);
|
gdb_assert (tp != NULL);
|
|
|
/* If tp->private is NULL, then GDB is already attached to this
|
/* If tp->private is NULL, then GDB is already attached to this
|
thread, but we do not know anything about it. We can learn
|
thread, but we do not know anything about it. We can learn
|
about it here. This can only happen if we have some other
|
about it here. This can only happen if we have some other
|
way besides libthread_db to notice new threads (i.e.
|
way besides libthread_db to notice new threads (i.e.
|
PTRACE_EVENT_CLONE); assume the same mechanism notices thread
|
PTRACE_EVENT_CLONE); assume the same mechanism notices thread
|
exit, so this can not be a stale thread recreated with the
|
exit, so this can not be a stale thread recreated with the
|
same ID. */
|
same ID. */
|
if (tp->private != NULL)
|
if (tp->private != NULL)
|
{
|
{
|
if (!tp->private->dying)
|
if (!tp->private->dying)
|
return 0;
|
return 0;
|
|
|
delete_thread (ptid);
|
delete_thread (ptid);
|
tp = NULL;
|
tp = NULL;
|
}
|
}
|
}
|
}
|
|
|
check_thread_signals ();
|
check_thread_signals ();
|
|
|
if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE)
|
if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE)
|
return 0; /* A zombie thread -- do not attach. */
|
return 0; /* A zombie thread -- do not attach. */
|
|
|
/* Under GNU/Linux, we have to attach to each and every thread. */
|
/* Under GNU/Linux, we have to attach to each and every thread. */
|
if (tp == NULL
|
if (tp == NULL
|
&& lin_lwp_attach_lwp (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid))) < 0)
|
&& lin_lwp_attach_lwp (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid))) < 0)
|
return 0;
|
return 0;
|
|
|
/* Construct the thread's private data. */
|
/* Construct the thread's private data. */
|
private = xmalloc (sizeof (struct private_thread_info));
|
private = xmalloc (sizeof (struct private_thread_info));
|
memset (private, 0, sizeof (struct private_thread_info));
|
memset (private, 0, sizeof (struct private_thread_info));
|
|
|
/* A thread ID of zero may mean the thread library has not initialized
|
/* A thread ID of zero may mean the thread library has not initialized
|
yet. But we shouldn't even get here if that's the case. FIXME:
|
yet. But we shouldn't even get here if that's the case. FIXME:
|
if we change GDB to always have at least one thread in the thread
|
if we change GDB to always have at least one thread in the thread
|
list this will have to go somewhere else; maybe private == NULL
|
list this will have to go somewhere else; maybe private == NULL
|
until the thread_db target claims it. */
|
until the thread_db target claims it. */
|
gdb_assert (ti_p->ti_tid != 0);
|
gdb_assert (ti_p->ti_tid != 0);
|
private->th = *th_p;
|
private->th = *th_p;
|
private->tid = ti_p->ti_tid;
|
private->tid = ti_p->ti_tid;
|
|
|
/* Add the thread to GDB's thread list. */
|
/* Add the thread to GDB's thread list. */
|
if (tp == NULL)
|
if (tp == NULL)
|
tp = add_thread_with_info (ptid, private);
|
tp = add_thread_with_info (ptid, private);
|
else
|
else
|
tp->private = private;
|
tp->private = private;
|
|
|
info = get_thread_db_info (GET_PID (ptid));
|
info = get_thread_db_info (GET_PID (ptid));
|
|
|
/* Enable thread event reporting for this thread. */
|
/* Enable thread event reporting for this thread. */
|
err = info->td_thr_event_enable_p (th_p, 1);
|
err = info->td_thr_event_enable_p (th_p, 1);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
error (_("Cannot enable thread event reporting for %s: %s"),
|
error (_("Cannot enable thread event reporting for %s: %s"),
|
target_pid_to_str (ptid), thread_db_err_str (err));
|
target_pid_to_str (ptid), thread_db_err_str (err));
|
return 1;
|
return 1;
|
}
|
}
|
|
|
static void
|
static void
|
detach_thread (ptid_t ptid)
|
detach_thread (ptid_t ptid)
|
{
|
{
|
struct thread_info *thread_info;
|
struct thread_info *thread_info;
|
|
|
/* Don't delete the thread now, because it still reports as active
|
/* Don't delete the thread now, because it still reports as active
|
until it has executed a few instructions after the event
|
until it has executed a few instructions after the event
|
breakpoint - if we deleted it now, "info threads" would cause us
|
breakpoint - if we deleted it now, "info threads" would cause us
|
to re-attach to it. Just mark it as having had a TD_DEATH
|
to re-attach to it. Just mark it as having had a TD_DEATH
|
event. This means that we won't delete it from our thread list
|
event. This means that we won't delete it from our thread list
|
until we notice that it's dead (via prune_threads), or until
|
until we notice that it's dead (via prune_threads), or until
|
something re-uses its thread ID. We'll report the thread exit
|
something re-uses its thread ID. We'll report the thread exit
|
when the underlying LWP dies. */
|
when the underlying LWP dies. */
|
thread_info = find_thread_ptid (ptid);
|
thread_info = find_thread_ptid (ptid);
|
gdb_assert (thread_info != NULL && thread_info->private != NULL);
|
gdb_assert (thread_info != NULL && thread_info->private != NULL);
|
thread_info->private->dying = 1;
|
thread_info->private->dying = 1;
|
}
|
}
|
|
|
static void
|
static void
|
thread_db_detach (struct target_ops *ops, char *args, int from_tty)
|
thread_db_detach (struct target_ops *ops, char *args, int from_tty)
|
{
|
{
|
struct target_ops *target_beneath = find_target_beneath (ops);
|
struct target_ops *target_beneath = find_target_beneath (ops);
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
|
|
info = get_thread_db_info (GET_PID (inferior_ptid));
|
info = get_thread_db_info (GET_PID (inferior_ptid));
|
|
|
if (info)
|
if (info)
|
{
|
{
|
disable_thread_event_reporting (info);
|
disable_thread_event_reporting (info);
|
|
|
/* Delete the old thread event breakpoints. Note that unlike
|
/* Delete the old thread event breakpoints. Note that unlike
|
when mourning, we can remove them here because there's still
|
when mourning, we can remove them here because there's still
|
a live inferior to poke at. In any case, GDB will not try to
|
a live inferior to poke at. In any case, GDB will not try to
|
insert anything in the inferior when removing a
|
insert anything in the inferior when removing a
|
breakpoint. */
|
breakpoint. */
|
remove_thread_event_breakpoints ();
|
remove_thread_event_breakpoints ();
|
|
|
delete_thread_db_info (GET_PID (inferior_ptid));
|
delete_thread_db_info (GET_PID (inferior_ptid));
|
}
|
}
|
|
|
target_beneath->to_detach (target_beneath, args, from_tty);
|
target_beneath->to_detach (target_beneath, args, from_tty);
|
|
|
/* NOTE: From this point on, inferior_ptid is null_ptid. */
|
/* NOTE: From this point on, inferior_ptid is null_ptid. */
|
|
|
/* If there are no more processes using libpthread, detach the
|
/* If there are no more processes using libpthread, detach the
|
thread_db target ops. */
|
thread_db target ops. */
|
if (!thread_db_list)
|
if (!thread_db_list)
|
unpush_target (&thread_db_ops);
|
unpush_target (&thread_db_ops);
|
}
|
}
|
|
|
/* Check if PID is currently stopped at the location of a thread event
|
/* Check if PID is currently stopped at the location of a thread event
|
breakpoint location. If it is, read the event message and act upon
|
breakpoint location. If it is, read the event message and act upon
|
the event. */
|
the event. */
|
|
|
static void
|
static void
|
check_event (ptid_t ptid)
|
check_event (ptid_t 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);
|
td_event_msg_t msg;
|
td_event_msg_t msg;
|
td_thrinfo_t ti;
|
td_thrinfo_t ti;
|
td_err_e err;
|
td_err_e err;
|
CORE_ADDR stop_pc;
|
CORE_ADDR stop_pc;
|
int loop = 0;
|
int loop = 0;
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
|
|
info = get_thread_db_info (GET_PID (ptid));
|
info = get_thread_db_info (GET_PID (ptid));
|
|
|
/* Bail out early if we're not at a thread event breakpoint. */
|
/* Bail out early if we're not at a thread event breakpoint. */
|
stop_pc = regcache_read_pc (regcache)
|
stop_pc = regcache_read_pc (regcache)
|
- gdbarch_decr_pc_after_break (gdbarch);
|
- gdbarch_decr_pc_after_break (gdbarch);
|
if (stop_pc != info->td_create_bp_addr
|
if (stop_pc != info->td_create_bp_addr
|
&& stop_pc != info->td_death_bp_addr)
|
&& stop_pc != info->td_death_bp_addr)
|
return;
|
return;
|
|
|
/* Access an lwp we know is stopped. */
|
/* Access an lwp we know is stopped. */
|
info->proc_handle.ptid = ptid;
|
info->proc_handle.ptid = ptid;
|
|
|
/* If we have only looked at the first thread before libpthread was
|
/* If we have only looked at the first thread before libpthread was
|
initialized, we may not know its thread ID yet. Make sure we do
|
initialized, we may not know its thread ID yet. Make sure we do
|
before we add another thread to the list. */
|
before we add another thread to the list. */
|
if (!have_threads (ptid))
|
if (!have_threads (ptid))
|
thread_db_find_new_threads_1 (ptid);
|
thread_db_find_new_threads_1 (ptid);
|
|
|
/* If we are at a create breakpoint, we do not know what new lwp
|
/* If we are at a create breakpoint, we do not know what new lwp
|
was created and cannot specifically locate the event message for it.
|
was created and cannot specifically locate the event message for it.
|
We have to call td_ta_event_getmsg() to get
|
We have to call td_ta_event_getmsg() to get
|
the latest message. Since we have no way of correlating whether
|
the latest message. Since we have no way of correlating whether
|
the event message we get back corresponds to our breakpoint, we must
|
the event message we get back corresponds to our breakpoint, we must
|
loop and read all event messages, processing them appropriately.
|
loop and read all event messages, processing them appropriately.
|
This guarantees we will process the correct message before continuing
|
This guarantees we will process the correct message before continuing
|
from the breakpoint.
|
from the breakpoint.
|
|
|
Currently, death events are not enabled. If they are enabled,
|
Currently, death events are not enabled. If they are enabled,
|
the death event can use the td_thr_event_getmsg() interface to
|
the death event can use the td_thr_event_getmsg() interface to
|
get the message specifically for that lwp and avoid looping
|
get the message specifically for that lwp and avoid looping
|
below. */
|
below. */
|
|
|
loop = 1;
|
loop = 1;
|
|
|
do
|
do
|
{
|
{
|
err = info->td_ta_event_getmsg_p (info->thread_agent, &msg);
|
err = info->td_ta_event_getmsg_p (info->thread_agent, &msg);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
{
|
{
|
if (err == TD_NOMSG)
|
if (err == TD_NOMSG)
|
return;
|
return;
|
|
|
error (_("Cannot get thread event message: %s"),
|
error (_("Cannot get thread event message: %s"),
|
thread_db_err_str (err));
|
thread_db_err_str (err));
|
}
|
}
|
|
|
err = info->td_thr_get_info_p (msg.th_p, &ti);
|
err = info->td_thr_get_info_p (msg.th_p, &ti);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
error (_("Cannot get thread info: %s"), thread_db_err_str (err));
|
error (_("Cannot get thread info: %s"), thread_db_err_str (err));
|
|
|
ptid = ptid_build (GET_PID (ptid), ti.ti_lid, 0);
|
ptid = ptid_build (GET_PID (ptid), ti.ti_lid, 0);
|
|
|
switch (msg.event)
|
switch (msg.event)
|
{
|
{
|
case TD_CREATE:
|
case TD_CREATE:
|
/* Call attach_thread whether or not we already know about a
|
/* Call attach_thread whether or not we already know about a
|
thread with this thread ID. */
|
thread with this thread ID. */
|
attach_thread (ptid, msg.th_p, &ti);
|
attach_thread (ptid, msg.th_p, &ti);
|
|
|
break;
|
break;
|
|
|
case TD_DEATH:
|
case TD_DEATH:
|
|
|
if (!in_thread_list (ptid))
|
if (!in_thread_list (ptid))
|
error (_("Spurious thread death event."));
|
error (_("Spurious thread death event."));
|
|
|
detach_thread (ptid);
|
detach_thread (ptid);
|
|
|
break;
|
break;
|
|
|
default:
|
default:
|
error (_("Spurious thread event."));
|
error (_("Spurious thread event."));
|
}
|
}
|
}
|
}
|
while (loop);
|
while (loop);
|
}
|
}
|
|
|
static ptid_t
|
static ptid_t
|
thread_db_wait (struct target_ops *ops,
|
thread_db_wait (struct target_ops *ops,
|
ptid_t ptid, struct target_waitstatus *ourstatus,
|
ptid_t ptid, struct target_waitstatus *ourstatus,
|
int options)
|
int options)
|
{
|
{
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
struct target_ops *beneath = find_target_beneath (ops);
|
struct target_ops *beneath = find_target_beneath (ops);
|
|
|
ptid = beneath->to_wait (beneath, ptid, ourstatus, options);
|
ptid = beneath->to_wait (beneath, ptid, ourstatus, options);
|
|
|
if (ourstatus->kind == TARGET_WAITKIND_IGNORE)
|
if (ourstatus->kind == TARGET_WAITKIND_IGNORE)
|
return ptid;
|
return ptid;
|
|
|
if (ourstatus->kind == TARGET_WAITKIND_EXITED
|
if (ourstatus->kind == TARGET_WAITKIND_EXITED
|
|| ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
|
|| ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
|
return ptid;
|
return ptid;
|
|
|
info = get_thread_db_info (GET_PID (ptid));
|
info = get_thread_db_info (GET_PID (ptid));
|
|
|
/* If this process isn't using thread_db, we're done. */
|
/* If this process isn't using thread_db, we're done. */
|
if (info == NULL)
|
if (info == NULL)
|
return ptid;
|
return ptid;
|
|
|
if (ourstatus->kind == TARGET_WAITKIND_EXECD)
|
if (ourstatus->kind == TARGET_WAITKIND_EXECD)
|
{
|
{
|
/* New image, it may or may not end up using thread_db. Assume
|
/* New image, it may or may not end up using thread_db. Assume
|
not unless we find otherwise. */
|
not unless we find otherwise. */
|
delete_thread_db_info (GET_PID (ptid));
|
delete_thread_db_info (GET_PID (ptid));
|
if (!thread_db_list)
|
if (!thread_db_list)
|
unpush_target (&thread_db_ops);
|
unpush_target (&thread_db_ops);
|
|
|
/* Thread event breakpoints are deleted by
|
/* Thread event breakpoints are deleted by
|
update_breakpoints_after_exec. */
|
update_breakpoints_after_exec. */
|
|
|
return ptid;
|
return ptid;
|
}
|
}
|
|
|
/* If we do not know about the main thread yet, this would be a good time to
|
/* If we do not know about the main thread yet, this would be a good time to
|
find it. */
|
find it. */
|
if (ourstatus->kind == TARGET_WAITKIND_STOPPED && !have_threads (ptid))
|
if (ourstatus->kind == TARGET_WAITKIND_STOPPED && !have_threads (ptid))
|
thread_db_find_new_threads_1 (ptid);
|
thread_db_find_new_threads_1 (ptid);
|
|
|
if (ourstatus->kind == TARGET_WAITKIND_STOPPED
|
if (ourstatus->kind == TARGET_WAITKIND_STOPPED
|
&& ourstatus->value.sig == TARGET_SIGNAL_TRAP)
|
&& ourstatus->value.sig == TARGET_SIGNAL_TRAP)
|
/* Check for a thread event. */
|
/* Check for a thread event. */
|
check_event (ptid);
|
check_event (ptid);
|
|
|
if (have_threads (ptid))
|
if (have_threads (ptid))
|
{
|
{
|
/* Change ptids back into the higher level PID + TID format. If
|
/* Change ptids back into the higher level PID + TID format. If
|
the thread is dead and no longer on the thread list, we will
|
the thread is dead and no longer on the thread list, we will
|
get back a dead ptid. This can occur if the thread death
|
get back a dead ptid. This can occur if the thread death
|
event gets postponed by other simultaneous events. In such a
|
event gets postponed by other simultaneous events. In such a
|
case, we want to just ignore the event and continue on. */
|
case, we want to just ignore the event and continue on. */
|
|
|
ptid = thread_from_lwp (ptid);
|
ptid = thread_from_lwp (ptid);
|
if (GET_PID (ptid) == -1)
|
if (GET_PID (ptid) == -1)
|
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
|
ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
|
}
|
}
|
|
|
return ptid;
|
return ptid;
|
}
|
}
|
|
|
static void
|
static void
|
thread_db_mourn_inferior (struct target_ops *ops)
|
thread_db_mourn_inferior (struct target_ops *ops)
|
{
|
{
|
struct target_ops *target_beneath = find_target_beneath (ops);
|
struct target_ops *target_beneath = find_target_beneath (ops);
|
|
|
delete_thread_db_info (GET_PID (inferior_ptid));
|
delete_thread_db_info (GET_PID (inferior_ptid));
|
|
|
target_beneath->to_mourn_inferior (target_beneath);
|
target_beneath->to_mourn_inferior (target_beneath);
|
|
|
/* Delete the old thread event breakpoints. Do this after mourning
|
/* Delete the old thread event breakpoints. Do this after mourning
|
the inferior, so that we don't try to uninsert them. */
|
the inferior, so that we don't try to uninsert them. */
|
remove_thread_event_breakpoints ();
|
remove_thread_event_breakpoints ();
|
|
|
/* Detach thread_db target ops. */
|
/* Detach thread_db target ops. */
|
if (!thread_db_list)
|
if (!thread_db_list)
|
unpush_target (ops);
|
unpush_target (ops);
|
}
|
}
|
|
|
struct callback_data
|
struct callback_data
|
{
|
{
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
int new_threads;
|
int new_threads;
|
};
|
};
|
|
|
static int
|
static int
|
find_new_threads_callback (const td_thrhandle_t *th_p, void *data)
|
find_new_threads_callback (const td_thrhandle_t *th_p, void *data)
|
{
|
{
|
td_thrinfo_t ti;
|
td_thrinfo_t ti;
|
td_err_e err;
|
td_err_e err;
|
ptid_t ptid;
|
ptid_t ptid;
|
struct thread_info *tp;
|
struct thread_info *tp;
|
struct callback_data *cb_data = data;
|
struct callback_data *cb_data = data;
|
struct thread_db_info *info = cb_data->info;
|
struct thread_db_info *info = cb_data->info;
|
|
|
err = info->td_thr_get_info_p (th_p, &ti);
|
err = info->td_thr_get_info_p (th_p, &ti);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
error (_("find_new_threads_callback: cannot get thread info: %s"),
|
error (_("find_new_threads_callback: cannot get thread info: %s"),
|
thread_db_err_str (err));
|
thread_db_err_str (err));
|
|
|
if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
|
if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
|
return 0; /* A zombie -- ignore. */
|
return 0; /* A zombie -- ignore. */
|
|
|
if (ti.ti_tid == 0)
|
if (ti.ti_tid == 0)
|
{
|
{
|
/* A thread ID of zero means that this is the main thread, but
|
/* A thread ID of zero means that this is the main thread, but
|
glibc has not yet initialized thread-local storage and the
|
glibc has not yet initialized thread-local storage and the
|
pthread library. We do not know what the thread's TID will
|
pthread library. We do not know what the thread's TID will
|
be yet. Just enable event reporting and otherwise ignore
|
be yet. Just enable event reporting and otherwise ignore
|
it. */
|
it. */
|
|
|
/* In that case, we're not stopped in a fork syscall and don't
|
/* In that case, we're not stopped in a fork syscall and don't
|
need this glibc bug workaround. */
|
need this glibc bug workaround. */
|
info->need_stale_parent_threads_check = 0;
|
info->need_stale_parent_threads_check = 0;
|
|
|
err = info->td_thr_event_enable_p (th_p, 1);
|
err = info->td_thr_event_enable_p (th_p, 1);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
error (_("Cannot enable thread event reporting for LWP %d: %s"),
|
error (_("Cannot enable thread event reporting for LWP %d: %s"),
|
(int) ti.ti_lid, thread_db_err_str (err));
|
(int) ti.ti_lid, thread_db_err_str (err));
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Ignore stale parent threads, caused by glibc/BZ5983. This is a
|
/* Ignore stale parent threads, caused by glibc/BZ5983. This is a
|
bit expensive, as it needs to open /proc/pid/status, so try to
|
bit expensive, as it needs to open /proc/pid/status, so try to
|
avoid doing the work if we know we don't have to. */
|
avoid doing the work if we know we don't have to. */
|
if (info->need_stale_parent_threads_check)
|
if (info->need_stale_parent_threads_check)
|
{
|
{
|
int tgid = linux_proc_get_tgid (ti.ti_lid);
|
int tgid = linux_proc_get_tgid (ti.ti_lid);
|
if (tgid != -1 && tgid != info->pid)
|
if (tgid != -1 && tgid != info->pid)
|
return 0;
|
return 0;
|
}
|
}
|
|
|
ptid = ptid_build (info->pid, ti.ti_lid, 0);
|
ptid = ptid_build (info->pid, ti.ti_lid, 0);
|
tp = find_thread_ptid (ptid);
|
tp = find_thread_ptid (ptid);
|
if (tp == NULL || tp->private == NULL)
|
if (tp == NULL || tp->private == NULL)
|
{
|
{
|
if (attach_thread (ptid, th_p, &ti))
|
if (attach_thread (ptid, th_p, &ti))
|
cb_data->new_threads += 1;
|
cb_data->new_threads += 1;
|
else
|
else
|
/* Problem attaching this thread; perhaps it exited before we
|
/* Problem attaching this thread; perhaps it exited before we
|
could attach it?
|
could attach it?
|
This could mean that the thread list inside glibc itself is in
|
This could mean that the thread list inside glibc itself is in
|
inconsistent state, and libthread_db could go on looping forever
|
inconsistent state, and libthread_db could go on looping forever
|
(observed with glibc-2.3.6). To prevent that, terminate
|
(observed with glibc-2.3.6). To prevent that, terminate
|
iteration: thread_db_find_new_threads_2 will retry. */
|
iteration: thread_db_find_new_threads_2 will retry. */
|
return 1;
|
return 1;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Helper for thread_db_find_new_threads_2.
|
/* Helper for thread_db_find_new_threads_2.
|
Returns number of new threads found. */
|
Returns number of new threads found. */
|
|
|
static int
|
static int
|
find_new_threads_once (struct thread_db_info *info, int iteration,
|
find_new_threads_once (struct thread_db_info *info, int iteration,
|
td_err_e *errp)
|
td_err_e *errp)
|
{
|
{
|
volatile struct gdb_exception except;
|
volatile struct gdb_exception except;
|
struct callback_data data;
|
struct callback_data data;
|
td_err_e err = TD_ERR;
|
td_err_e err = TD_ERR;
|
|
|
data.info = info;
|
data.info = info;
|
data.new_threads = 0;
|
data.new_threads = 0;
|
|
|
TRY_CATCH (except, RETURN_MASK_ERROR)
|
TRY_CATCH (except, RETURN_MASK_ERROR)
|
{
|
{
|
/* Iterate over all user-space threads to discover new threads. */
|
/* Iterate over all user-space threads to discover new threads. */
|
err = info->td_ta_thr_iter_p (info->thread_agent,
|
err = info->td_ta_thr_iter_p (info->thread_agent,
|
find_new_threads_callback,
|
find_new_threads_callback,
|
&data,
|
&data,
|
TD_THR_ANY_STATE,
|
TD_THR_ANY_STATE,
|
TD_THR_LOWEST_PRIORITY,
|
TD_THR_LOWEST_PRIORITY,
|
TD_SIGNO_MASK,
|
TD_SIGNO_MASK,
|
TD_THR_ANY_USER_FLAGS);
|
TD_THR_ANY_USER_FLAGS);
|
}
|
}
|
|
|
if (info_verbose)
|
if (info_verbose)
|
{
|
{
|
if (except.reason < 0)
|
if (except.reason < 0)
|
exception_fprintf (gdb_stderr, except,
|
exception_fprintf (gdb_stderr, except,
|
"Warning: find_new_threads_once: ");
|
"Warning: find_new_threads_once: ");
|
|
|
printf_filtered (_("Found %d new threads in iteration %d.\n"),
|
printf_filtered (_("Found %d new threads in iteration %d.\n"),
|
data.new_threads, iteration);
|
data.new_threads, iteration);
|
}
|
}
|
|
|
if (errp != NULL)
|
if (errp != NULL)
|
*errp = err;
|
*errp = err;
|
|
|
return data.new_threads;
|
return data.new_threads;
|
}
|
}
|
|
|
/* Search for new threads, accessing memory through stopped thread
|
/* Search for new threads, accessing memory through stopped thread
|
PTID. If UNTIL_NO_NEW is true, repeat searching until several
|
PTID. If UNTIL_NO_NEW is true, repeat searching until several
|
searches in a row do not discover any new threads. */
|
searches in a row do not discover any new threads. */
|
|
|
static void
|
static void
|
thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new)
|
thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new)
|
{
|
{
|
td_err_e err;
|
td_err_e err;
|
struct lwp_info *lp;
|
struct lwp_info *lp;
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
int pid = ptid_get_pid (ptid);
|
int pid = ptid_get_pid (ptid);
|
int i, loop;
|
int i, loop;
|
|
|
/* In linux, we can only read memory through a stopped lwp. */
|
/* In linux, we can only read memory through a stopped lwp. */
|
ALL_LWPS (lp, ptid)
|
ALL_LWPS (lp, ptid)
|
if (lp->stopped && ptid_get_pid (lp->ptid) == pid)
|
if (lp->stopped && ptid_get_pid (lp->ptid) == pid)
|
break;
|
break;
|
|
|
if (!lp)
|
if (!lp)
|
/* There is no stopped thread. Bail out. */
|
/* There is no stopped thread. Bail out. */
|
return;
|
return;
|
|
|
info = get_thread_db_info (GET_PID (ptid));
|
info = get_thread_db_info (GET_PID (ptid));
|
|
|
/* Access an lwp we know is stopped. */
|
/* Access an lwp we know is stopped. */
|
info->proc_handle.ptid = ptid;
|
info->proc_handle.ptid = ptid;
|
|
|
if (until_no_new)
|
if (until_no_new)
|
{
|
{
|
/* Require 4 successive iterations which do not find any new threads.
|
/* Require 4 successive iterations which do not find any new threads.
|
The 4 is a heuristic: there is an inherent race here, and I have
|
The 4 is a heuristic: there is an inherent race here, and I have
|
seen that 2 iterations in a row are not always sufficient to
|
seen that 2 iterations in a row are not always sufficient to
|
"capture" all threads. */
|
"capture" all threads. */
|
for (i = 0, loop = 0; loop < 4; ++i, ++loop)
|
for (i = 0, loop = 0; loop < 4; ++i, ++loop)
|
if (find_new_threads_once (info, i, NULL) != 0)
|
if (find_new_threads_once (info, i, NULL) != 0)
|
/* Found some new threads. Restart the loop from beginning. */
|
/* Found some new threads. Restart the loop from beginning. */
|
loop = -1;
|
loop = -1;
|
}
|
}
|
else
|
else
|
{
|
{
|
td_err_e err;
|
td_err_e err;
|
|
|
find_new_threads_once (info, 0, &err);
|
find_new_threads_once (info, 0, &err);
|
if (err != TD_OK)
|
if (err != TD_OK)
|
error (_("Cannot find new threads: %s"), thread_db_err_str (err));
|
error (_("Cannot find new threads: %s"), thread_db_err_str (err));
|
}
|
}
|
}
|
}
|
|
|
static void
|
static void
|
thread_db_find_new_threads_1 (ptid_t ptid)
|
thread_db_find_new_threads_1 (ptid_t ptid)
|
{
|
{
|
thread_db_find_new_threads_2 (ptid, 0);
|
thread_db_find_new_threads_2 (ptid, 0);
|
}
|
}
|
|
|
static int
|
static int
|
update_thread_core (struct lwp_info *info, void *closure)
|
update_thread_core (struct lwp_info *info, void *closure)
|
{
|
{
|
info->core = linux_nat_core_of_thread_1 (info->ptid);
|
info->core = linux_nat_core_of_thread_1 (info->ptid);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
static void
|
static void
|
thread_db_find_new_threads (struct target_ops *ops)
|
thread_db_find_new_threads (struct target_ops *ops)
|
{
|
{
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
|
|
info = get_thread_db_info (GET_PID (inferior_ptid));
|
info = get_thread_db_info (GET_PID (inferior_ptid));
|
|
|
if (info == NULL)
|
if (info == NULL)
|
return;
|
return;
|
|
|
thread_db_find_new_threads_1 (inferior_ptid);
|
thread_db_find_new_threads_1 (inferior_ptid);
|
|
|
iterate_over_lwps (minus_one_ptid /* iterate over all */,
|
iterate_over_lwps (minus_one_ptid /* iterate over all */,
|
update_thread_core, NULL);
|
update_thread_core, NULL);
|
}
|
}
|
|
|
static char *
|
static char *
|
thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid)
|
thread_db_pid_to_str (struct target_ops *ops, ptid_t ptid)
|
{
|
{
|
struct thread_info *thread_info = find_thread_ptid (ptid);
|
struct thread_info *thread_info = find_thread_ptid (ptid);
|
struct target_ops *beneath;
|
struct target_ops *beneath;
|
|
|
if (thread_info != NULL && thread_info->private != NULL)
|
if (thread_info != NULL && thread_info->private != NULL)
|
{
|
{
|
static char buf[64];
|
static char buf[64];
|
thread_t tid;
|
thread_t tid;
|
|
|
tid = thread_info->private->tid;
|
tid = thread_info->private->tid;
|
snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)",
|
snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)",
|
tid, GET_LWP (ptid));
|
tid, GET_LWP (ptid));
|
|
|
return buf;
|
return buf;
|
}
|
}
|
|
|
beneath = find_target_beneath (ops);
|
beneath = find_target_beneath (ops);
|
if (beneath->to_pid_to_str (beneath, ptid))
|
if (beneath->to_pid_to_str (beneath, ptid))
|
return beneath->to_pid_to_str (beneath, ptid);
|
return beneath->to_pid_to_str (beneath, ptid);
|
|
|
return normal_pid_to_str (ptid);
|
return normal_pid_to_str (ptid);
|
}
|
}
|
|
|
/* Return a string describing the state of the thread specified by
|
/* Return a string describing the state of the thread specified by
|
INFO. */
|
INFO. */
|
|
|
static char *
|
static char *
|
thread_db_extra_thread_info (struct thread_info *info)
|
thread_db_extra_thread_info (struct thread_info *info)
|
{
|
{
|
if (info->private == NULL)
|
if (info->private == NULL)
|
return NULL;
|
return NULL;
|
|
|
if (info->private->dying)
|
if (info->private->dying)
|
return "Exiting";
|
return "Exiting";
|
|
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/* Get the address of the thread local variable in load module LM which
|
/* Get the address of the thread local variable in load module LM which
|
is stored at OFFSET within the thread local storage for thread PTID. */
|
is stored at OFFSET within the thread local storage for thread PTID. */
|
|
|
static CORE_ADDR
|
static CORE_ADDR
|
thread_db_get_thread_local_address (struct target_ops *ops,
|
thread_db_get_thread_local_address (struct target_ops *ops,
|
ptid_t ptid,
|
ptid_t ptid,
|
CORE_ADDR lm,
|
CORE_ADDR lm,
|
CORE_ADDR offset)
|
CORE_ADDR offset)
|
{
|
{
|
struct thread_info *thread_info;
|
struct thread_info *thread_info;
|
struct target_ops *beneath;
|
struct target_ops *beneath;
|
|
|
/* If we have not discovered any threads yet, check now. */
|
/* If we have not discovered any threads yet, check now. */
|
if (!have_threads (ptid))
|
if (!have_threads (ptid))
|
thread_db_find_new_threads_1 (ptid);
|
thread_db_find_new_threads_1 (ptid);
|
|
|
/* Find the matching thread. */
|
/* Find the matching thread. */
|
thread_info = find_thread_ptid (ptid);
|
thread_info = find_thread_ptid (ptid);
|
|
|
if (thread_info != NULL && thread_info->private != NULL)
|
if (thread_info != NULL && thread_info->private != NULL)
|
{
|
{
|
td_err_e err;
|
td_err_e err;
|
psaddr_t address;
|
psaddr_t address;
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
|
|
info = get_thread_db_info (GET_PID (ptid));
|
info = get_thread_db_info (GET_PID (ptid));
|
|
|
/* glibc doesn't provide the needed interface. */
|
/* glibc doesn't provide the needed interface. */
|
if (!info->td_thr_tls_get_addr_p)
|
if (!info->td_thr_tls_get_addr_p)
|
throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR,
|
throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR,
|
_("No TLS library support"));
|
_("No TLS library support"));
|
|
|
/* Caller should have verified that lm != 0. */
|
/* Caller should have verified that lm != 0. */
|
gdb_assert (lm != 0);
|
gdb_assert (lm != 0);
|
|
|
/* Finally, get the address of the variable. */
|
/* Finally, get the address of the variable. */
|
/* Note the cast through uintptr_t: this interface only works if
|
/* Note the cast through uintptr_t: this interface only works if
|
a target address fits in a psaddr_t, which is a host pointer.
|
a target address fits in a psaddr_t, which is a host pointer.
|
So a 32-bit debugger can not access 64-bit TLS through this. */
|
So a 32-bit debugger can not access 64-bit TLS through this. */
|
err = info->td_thr_tls_get_addr_p (&thread_info->private->th,
|
err = info->td_thr_tls_get_addr_p (&thread_info->private->th,
|
(psaddr_t)(uintptr_t) lm,
|
(psaddr_t)(uintptr_t) lm,
|
offset, &address);
|
offset, &address);
|
|
|
#ifdef THREAD_DB_HAS_TD_NOTALLOC
|
#ifdef THREAD_DB_HAS_TD_NOTALLOC
|
/* The memory hasn't been allocated, yet. */
|
/* The memory hasn't been allocated, yet. */
|
if (err == TD_NOTALLOC)
|
if (err == TD_NOTALLOC)
|
/* Now, if libthread_db provided the initialization image's
|
/* Now, if libthread_db provided the initialization image's
|
address, we *could* try to build a non-lvalue value from
|
address, we *could* try to build a non-lvalue value from
|
the initialization image. */
|
the initialization image. */
|
throw_error (TLS_NOT_ALLOCATED_YET_ERROR,
|
throw_error (TLS_NOT_ALLOCATED_YET_ERROR,
|
_("TLS not allocated yet"));
|
_("TLS not allocated yet"));
|
#endif
|
#endif
|
|
|
/* Something else went wrong. */
|
/* Something else went wrong. */
|
if (err != TD_OK)
|
if (err != TD_OK)
|
throw_error (TLS_GENERIC_ERROR,
|
throw_error (TLS_GENERIC_ERROR,
|
(("%s")), thread_db_err_str (err));
|
(("%s")), thread_db_err_str (err));
|
|
|
/* Cast assuming host == target. Joy. */
|
/* Cast assuming host == target. Joy. */
|
/* Do proper sign extension for the target. */
|
/* Do proper sign extension for the target. */
|
gdb_assert (exec_bfd);
|
gdb_assert (exec_bfd);
|
return (bfd_get_sign_extend_vma (exec_bfd) > 0
|
return (bfd_get_sign_extend_vma (exec_bfd) > 0
|
? (CORE_ADDR) (intptr_t) address
|
? (CORE_ADDR) (intptr_t) address
|
: (CORE_ADDR) (uintptr_t) address);
|
: (CORE_ADDR) (uintptr_t) address);
|
}
|
}
|
|
|
beneath = find_target_beneath (ops);
|
beneath = find_target_beneath (ops);
|
if (beneath->to_get_thread_local_address)
|
if (beneath->to_get_thread_local_address)
|
return beneath->to_get_thread_local_address (beneath, ptid, lm, offset);
|
return beneath->to_get_thread_local_address (beneath, ptid, lm, offset);
|
else
|
else
|
throw_error (TLS_GENERIC_ERROR,
|
throw_error (TLS_GENERIC_ERROR,
|
_("TLS not supported on this target"));
|
_("TLS not supported on this target"));
|
}
|
}
|
|
|
/* Callback routine used to find a thread based on the TID part of
|
/* Callback routine used to find a thread based on the TID part of
|
its PTID. */
|
its PTID. */
|
|
|
static int
|
static int
|
thread_db_find_thread_from_tid (struct thread_info *thread, void *data)
|
thread_db_find_thread_from_tid (struct thread_info *thread, void *data)
|
{
|
{
|
long *tid = (long *) data;
|
long *tid = (long *) data;
|
|
|
if (thread->private->tid == *tid)
|
if (thread->private->tid == *tid)
|
return 1;
|
return 1;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Implement the to_get_ada_task_ptid target method for this target. */
|
/* Implement the to_get_ada_task_ptid target method for this target. */
|
|
|
static ptid_t
|
static ptid_t
|
thread_db_get_ada_task_ptid (long lwp, long thread)
|
thread_db_get_ada_task_ptid (long lwp, long thread)
|
{
|
{
|
struct thread_info *thread_info;
|
struct thread_info *thread_info;
|
|
|
thread_db_find_new_threads_1 (inferior_ptid);
|
thread_db_find_new_threads_1 (inferior_ptid);
|
thread_info = iterate_over_threads (thread_db_find_thread_from_tid, &thread);
|
thread_info = iterate_over_threads (thread_db_find_thread_from_tid, &thread);
|
|
|
gdb_assert (thread_info != NULL);
|
gdb_assert (thread_info != NULL);
|
|
|
return (thread_info->ptid);
|
return (thread_info->ptid);
|
}
|
}
|
|
|
static void
|
static void
|
thread_db_resume (struct target_ops *ops,
|
thread_db_resume (struct target_ops *ops,
|
ptid_t ptid, int step, enum target_signal signo)
|
ptid_t ptid, int step, enum target_signal signo)
|
{
|
{
|
struct target_ops *beneath = find_target_beneath (ops);
|
struct target_ops *beneath = find_target_beneath (ops);
|
struct thread_db_info *info;
|
struct thread_db_info *info;
|
|
|
if (ptid_equal (ptid, minus_one_ptid))
|
if (ptid_equal (ptid, minus_one_ptid))
|
info = get_thread_db_info (GET_PID (inferior_ptid));
|
info = get_thread_db_info (GET_PID (inferior_ptid));
|
else
|
else
|
info = get_thread_db_info (GET_PID (ptid));
|
info = get_thread_db_info (GET_PID (ptid));
|
|
|
/* This workaround is only needed for child fork lwps stopped in a
|
/* This workaround is only needed for child fork lwps stopped in a
|
PTRACE_O_TRACEFORK event. When the inferior is resumed, the
|
PTRACE_O_TRACEFORK event. When the inferior is resumed, the
|
workaround can be disabled. */
|
workaround can be disabled. */
|
if (info)
|
if (info)
|
info->need_stale_parent_threads_check = 0;
|
info->need_stale_parent_threads_check = 0;
|
|
|
beneath->to_resume (beneath, ptid, step, signo);
|
beneath->to_resume (beneath, ptid, step, signo);
|
}
|
}
|
|
|
static void
|
static void
|
init_thread_db_ops (void)
|
init_thread_db_ops (void)
|
{
|
{
|
thread_db_ops.to_shortname = "multi-thread";
|
thread_db_ops.to_shortname = "multi-thread";
|
thread_db_ops.to_longname = "multi-threaded child process.";
|
thread_db_ops.to_longname = "multi-threaded child process.";
|
thread_db_ops.to_doc = "Threads and pthreads support.";
|
thread_db_ops.to_doc = "Threads and pthreads support.";
|
thread_db_ops.to_detach = thread_db_detach;
|
thread_db_ops.to_detach = thread_db_detach;
|
thread_db_ops.to_wait = thread_db_wait;
|
thread_db_ops.to_wait = thread_db_wait;
|
thread_db_ops.to_resume = thread_db_resume;
|
thread_db_ops.to_resume = thread_db_resume;
|
thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior;
|
thread_db_ops.to_mourn_inferior = thread_db_mourn_inferior;
|
thread_db_ops.to_find_new_threads = thread_db_find_new_threads;
|
thread_db_ops.to_find_new_threads = thread_db_find_new_threads;
|
thread_db_ops.to_pid_to_str = thread_db_pid_to_str;
|
thread_db_ops.to_pid_to_str = thread_db_pid_to_str;
|
thread_db_ops.to_stratum = thread_stratum;
|
thread_db_ops.to_stratum = thread_stratum;
|
thread_db_ops.to_has_thread_control = tc_schedlock;
|
thread_db_ops.to_has_thread_control = tc_schedlock;
|
thread_db_ops.to_get_thread_local_address
|
thread_db_ops.to_get_thread_local_address
|
= thread_db_get_thread_local_address;
|
= thread_db_get_thread_local_address;
|
thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info;
|
thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info;
|
thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid;
|
thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid;
|
thread_db_ops.to_magic = OPS_MAGIC;
|
thread_db_ops.to_magic = OPS_MAGIC;
|
}
|
}
|
|
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
extern initialize_file_ftype _initialize_thread_db;
|
extern initialize_file_ftype _initialize_thread_db;
|
|
|
void
|
void
|
_initialize_thread_db (void)
|
_initialize_thread_db (void)
|
{
|
{
|
init_thread_db_ops ();
|
init_thread_db_ops ();
|
add_target (&thread_db_ops);
|
add_target (&thread_db_ops);
|
|
|
/* Defer loading of libthread_db.so until inferior is running.
|
/* Defer loading of libthread_db.so until inferior is running.
|
This allows gdb to load correct libthread_db for a given
|
This allows gdb to load correct libthread_db for a given
|
executable -- there could be mutiple versions of glibc,
|
executable -- there could be mutiple versions of glibc,
|
compiled with LinuxThreads or NPTL, and until there is
|
compiled with LinuxThreads or NPTL, and until there is
|
a running inferior, we can't tell which libthread_db is
|
a running inferior, we can't tell which libthread_db is
|
the correct one to load. */
|
the correct one to load. */
|
|
|
libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH);
|
libthread_db_search_path = xstrdup (LIBTHREAD_DB_SEARCH_PATH);
|
|
|
add_setshow_optional_filename_cmd ("libthread-db-search-path",
|
add_setshow_optional_filename_cmd ("libthread-db-search-path",
|
class_support,
|
class_support,
|
&libthread_db_search_path, _("\
|
&libthread_db_search_path, _("\
|
Set search path for libthread_db."), _("\
|
Set search path for libthread_db."), _("\
|
Show the current search path or libthread_db."), _("\
|
Show the current search path or libthread_db."), _("\
|
This path is used to search for libthread_db to be loaded into \
|
This path is used to search for libthread_db to be loaded into \
|
gdb itself."),
|
gdb itself."),
|
NULL,
|
NULL,
|
NULL,
|
NULL,
|
&setlist, &showlist);
|
&setlist, &showlist);
|
/* Add ourselves to objfile event chain. */
|
/* Add ourselves to objfile event chain. */
|
observer_attach_new_objfile (thread_db_new_objfile);
|
observer_attach_new_objfile (thread_db_new_objfile);
|
}
|
}
|
|
|
