/* libthread_db assisted debugging support, generic parts.
- Copyright (C) 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
- 2010, 2011 Free Software Foundation, Inc.
+ Copyright (C) 1999-2014 Free Software Foundation, Inc.
This file is part of GDB.
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
-
-#include "gdb_assert.h"
#include <dlfcn.h>
#include "gdb_proc_service.h"
-#include "gdb_thread_db.h"
-
+#include "nat/gdb_thread_db.h"
+#include "gdb_vecs.h"
#include "bfd.h"
#include "command.h"
-#include "exceptions.h"
#include "gdbcmd.h"
#include "gdbthread.h"
#include "inferior.h"
+#include "infrun.h"
#include "symfile.h"
#include "objfiles.h"
#include "target.h"
#include "gdbcore.h"
#include "observer.h"
#include "linux-nat.h"
-#include "linux-procfs.h"
+#include "nat/linux-procfs.h"
+#include "nat/linux-osdata.h"
+#include "auto-load.h"
+#include "cli/cli-utils.h"
#include <signal.h>
-
-#ifdef HAVE_GNU_LIBC_VERSION_H
-#include <gnu/libc-version.h>
-#endif
+#include <ctype.h>
/* GNU/Linux libthread_db support.
static char *libthread_db_search_path;
+/* Set to non-zero if thread_db auto-loading is enabled
+ by the "set auto-load libthread-db" command. */
+static int auto_load_thread_db = 1;
+
+/* "show" command for the auto_load_thread_db configuration variable. */
+
+static void
+show_auto_load_thread_db (struct ui_file *file, int from_tty,
+ struct cmd_list_element *c, const char *value)
+{
+ fprintf_filtered (file, _("Auto-loading of inferior specific libthread_db "
+ "is %s.\n"),
+ value);
+}
+
static void
set_libthread_db_search_path (char *ignored, int from_tty,
struct cmd_list_element *c)
/* If non-zero, print details of libthread_db processing. */
-static int libthread_db_debug;
+static unsigned int libthread_db_debug;
static void
show_libthread_db_debug (struct ui_file *file, int from_tty,
/* Handle from dlopen for libthread_db.so. */
void *handle;
+ /* Absolute pathname from gdb_realpath to disk file used for dlopen-ing
+ HANDLE. It may be NULL for system library. */
+ char *filename;
+
/* Structure that identifies the child process for the
<proc_service.h> interface. */
struct ps_prochandle proc_handle;
td_err_e (*td_thr_tls_get_addr_p) (const td_thrhandle_t *th,
psaddr_t map_address,
size_t offset, psaddr_t *address);
+ td_err_e (*td_thr_tlsbase_p) (const td_thrhandle_t *th,
+ unsigned long int modid,
+ psaddr_t *base);
};
/* List of known processes using thread_db, and the required
if (info->handle != NULL)
dlclose (info->handle);
+ xfree (info->filename);
+
if (info_prev)
info_prev->next = info->next;
else
thread_ptid = ptid_build (info->pid, ti.ti_lid, 0);
inout->thread_info = find_thread_ptid (thread_ptid);
- /* In the case of a zombie thread, don't continue. We don't want to
- attach to it thinking it is a new thread. */
- if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
- return TD_THR_ZOMBIE;
-
if (inout->thread_info == NULL)
{
/* New thread. Attach to it now (why wait?). */
return 0;
}
\f
-/* Convert between user-level thread ids and LWP ids. */
+/* Fetch the user-level thread id of PTID. */
-static ptid_t
+static void
thread_from_lwp (ptid_t ptid)
{
td_thrhandle_t th;
/* This ptid comes from linux-nat.c, which should always fill in the
LWP. */
- gdb_assert (GET_LWP (ptid) != 0);
+ gdb_assert (ptid_get_lwp (ptid) != 0);
- info = get_thread_db_info (GET_PID (ptid));
+ info = get_thread_db_info (ptid_get_pid (ptid));
/* Access an lwp we know is stopped. */
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, ptid_get_lwp (ptid),
+ &th);
if (err != TD_OK)
error (_("Cannot find user-level thread for LWP %ld: %s"),
- GET_LWP (ptid), thread_db_err_str (err));
-
- /* Fetch the thread info. If we get back TD_THR_ZOMBIE, then the
- event thread has already died. If another gdb interface has called
- 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
- to avoid the possibility of later treating it as a newly
- 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
- dead thread. */
+ ptid_get_lwp (ptid), thread_db_err_str (err));
+
+ /* Long-winded way of fetching the thread info. */
io.thread_db_info = info;
io.thread_info = NULL;
- if (thread_get_info_callback (&th, &io) == TD_THR_ZOMBIE
- && io.thread_info == NULL)
- return minus_one_ptid;
-
- gdb_assert (ptid_get_tid (ptid) == 0);
- return ptid;
+ thread_get_info_callback (&th, &io);
}
\f
td_err_e err;
struct thread_db_info *info;
- info = get_thread_db_info (GET_PID (ptid));
+ info = get_thread_db_info (ptid_get_pid (ptid));
if (info == NULL)
return 0;
/* This ptid comes from linux-nat.c, which should always fill in the
LWP. */
- gdb_assert (GET_LWP (ptid) != 0);
+ gdb_assert (ptid_get_lwp (ptid) != 0);
/* Access an lwp we know is stopped. */
info->proc_handle.ptid = ptid;
if (!have_threads (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, ptid_get_lwp (ptid),
+ &th);
if (err != TD_OK)
/* Cannot find user-level thread. */
return 0;
td_err_e err;
struct thread_db_info *info;
- info = get_thread_db_info (GET_PID (inferior_ptid));
+ info = get_thread_db_info (ptid_get_pid (inferior_ptid));
/* Access an lwp we know is stopped. */
info->proc_handle.ptid = inferior_ptid;
/* Set up the breakpoint. */
gdb_assert (exec_bfd);
(*bp) = (gdbarch_convert_from_func_ptr_addr
- (target_gdbarch,
+ (target_gdbarch (),
/* Do proper sign extension for the target. */
(bfd_get_sign_extend_vma (exec_bfd) > 0
? (CORE_ADDR) (intptr_t) notify.u.bptaddr
: (CORE_ADDR) (uintptr_t) notify.u.bptaddr),
¤t_target));
- create_thread_event_breakpoint (target_gdbarch, *bp);
+ create_thread_event_breakpoint (target_gdbarch (), *bp);
return TD_OK;
}
+/* Verify inferior's '\0'-terminated symbol VER_SYMBOL starts with "%d.%d" and
+ return 1 if this version is lower (and not equal) to
+ VER_MAJOR_MIN.VER_MINOR_MIN. Return 0 in all other cases. */
+
+static int
+inferior_has_bug (const char *ver_symbol, int ver_major_min, int ver_minor_min)
+{
+ struct bound_minimal_symbol version_msym;
+ CORE_ADDR version_addr;
+ char *version;
+ int err, got, retval = 0;
+
+ version_msym = lookup_minimal_symbol (ver_symbol, NULL, NULL);
+ if (version_msym.minsym == NULL)
+ return 0;
+
+ version_addr = BMSYMBOL_VALUE_ADDRESS (version_msym);
+ got = target_read_string (version_addr, &version, 32, &err);
+ if (err == 0 && memchr (version, 0, got) == &version[got -1])
+ {
+ int major, minor;
+
+ retval = (sscanf (version, "%d.%d", &major, &minor) == 2
+ && (major < ver_major_min
+ || (major == ver_major_min && minor < ver_minor_min)));
+ }
+ xfree (version);
+
+ return retval;
+}
+
static void
enable_thread_event_reporting (void)
{
td_thr_events_t events;
td_err_e err;
-#ifdef HAVE_GNU_LIBC_VERSION_H
- const char *libc_version;
- int libc_major, libc_minor;
-#endif
struct thread_db_info *info;
- info = get_thread_db_info (GET_PID (inferior_ptid));
+ info = get_thread_db_info (ptid_get_pid (inferior_ptid));
/* We cannot use the thread event reporting facility if these
functions aren't available. */
td_event_emptyset (&events);
td_event_addset (&events, TD_CREATE);
-#ifdef HAVE_GNU_LIBC_VERSION_H
- /* 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
- version. */
- libc_version = gnu_get_libc_version ();
- if (sscanf (libc_version, "%d.%d", &libc_major, &libc_minor) == 2
- && (libc_major > 2 || (libc_major == 2 && libc_minor > 1)))
-#endif
+ /* There is a bug fixed between linuxthreads 2.1.3 and 2.2 by
+ commit 2e4581e4fba917f1779cd0a010a45698586c190a
+ * manager.c (pthread_exited): Correctly report event as TD_REAP
+ instead of TD_DEATH. Fix comments.
+ where event reporting facility is broken for TD_DEATH events,
+ so don't enable it if we have glibc but a lower version. */
+ if (!inferior_has_bug ("__linuxthreads_version", 2, 2))
td_event_addset (&events, TD_DEATH);
err = info->td_ta_set_event_p (info->thread_agent, &events);
}
}
-/* Same as thread_db_find_new_threads_1, but silently ignore errors. */
+/* Similar as thread_db_find_new_threads_1, but try to silently ignore errors
+ if appropriate.
-static void
+ Return 1 if the caller should abort libthread_db initialization. Return 0
+ otherwise. */
+
+static int
thread_db_find_new_threads_silently (ptid_t ptid)
{
volatile struct gdb_exception except;
thread_db_find_new_threads_2 (ptid, 1);
}
- if (except.reason < 0 && libthread_db_debug)
+ if (except.reason < 0)
{
- exception_fprintf (gdb_stderr, except,
- "Warning: thread_db_find_new_threads_silently: ");
+ if (libthread_db_debug)
+ exception_fprintf (gdb_stderr, except,
+ "Warning: thread_db_find_new_threads_silently: ");
+
+ /* There is a bug fixed between nptl 2.6.1 and 2.7 by
+ commit 7d9d8bd18906fdd17364f372b160d7ab896ce909
+ where calls to td_thr_get_info fail with TD_ERR for statically linked
+ executables if td_thr_get_info is called before glibc has initialized
+ itself.
+
+ If the nptl bug is NOT present in the inferior and still thread_db
+ reports an error return 1. It means the inferior has corrupted thread
+ list and GDB should fall back only to LWPs.
+
+ If the nptl bug is present in the inferior return 0 to silently ignore
+ such errors, and let gdb enumerate threads again later. In such case
+ GDB cannot properly display LWPs if the inferior thread list is
+ corrupted. For core files it does not apply, no 'later enumeration'
+ is possible. */
+
+ if (!target_has_execution || !inferior_has_bug ("nptl_version", 2, 7))
+ {
+ exception_fprintf (gdb_stderr, except,
+ _("Warning: couldn't activate thread debugging "
+ "using libthread_db: "));
+ return 1;
+ }
}
+ return 0;
}
/* Lookup a library in which given symbol resides.
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_tls_get_addr_p = dlsym (info->handle, "td_thr_tls_get_addr");
+ info->td_thr_tlsbase_p = dlsym (info->handle, "td_thr_tlsbase");
+
+ if (thread_db_find_new_threads_silently (inferior_ptid) != 0)
+ {
+ /* Even if libthread_db initializes, if the thread list is
+ corrupted, we'd not manage to list any threads. Better reject this
+ thread_db, and fall back to at least listing LWPs. */
+ return 0;
+ }
printf_unfiltered (_("[Thread debugging using libthread_db enabled]\n"));
if (target_has_execution)
enable_thread_event_reporting ();
- /* 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
- called before glibc has initialized itself. Silently ignore such
- errors, and let gdb enumerate threads again later. */
- thread_db_find_new_threads_silently (inferior_ptid);
-
return 1;
}
relative, or just LIBTHREAD_DB. */
static int
-try_thread_db_load (const char *library)
+try_thread_db_load (const char *library, int check_auto_load_safe)
{
void *handle;
struct thread_db_info *info;
if (libthread_db_debug)
printf_unfiltered (_("Trying host libthread_db library: %s.\n"),
library);
+
+ if (check_auto_load_safe)
+ {
+ if (access (library, R_OK) != 0)
+ {
+ /* Do not print warnings by file_is_auto_load_safe if the library does
+ not exist at this place. */
+ if (libthread_db_debug)
+ printf_unfiltered (_("open failed: %s.\n"), safe_strerror (errno));
+ return 0;
+ }
+
+ if (!file_is_auto_load_safe (library, _("auto-load: Loading libthread-db "
+ "library \"%s\" from explicit "
+ "directory.\n"),
+ library))
+ return 0;
+ }
+
handle = dlopen (library, RTLD_NOW);
if (handle == NULL)
{
info = add_thread_db_info (handle);
+ /* Do not save system library name, that one is always trusted. */
+ if (strchr (library, '/') != NULL)
+ info->filename = gdb_realpath (library);
+
if (try_thread_db_load_1 (info))
return 1;
/* This library "refused" to work on current inferior. */
- delete_thread_db_info (GET_PID (inferior_ptid));
+ delete_thread_db_info (ptid_get_pid (inferior_ptid));
return 0;
}
/* Subroutine of try_thread_db_load_from_pdir to simplify it.
- Try loading libthread_db from the same directory as OBJ.
+ Try loading libthread_db in directory(OBJ)/SUBDIR.
+ SUBDIR may be NULL. It may also be something like "../lib64".
The result is true for success. */
static int
-try_thread_db_load_from_pdir_1 (struct objfile *obj)
+try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir)
{
struct cleanup *cleanup;
char *path, *cp;
int result;
+ const char *obj_name = objfile_name (obj);
- if (obj->name[0] != '/')
+ if (obj_name[0] != '/')
{
warning (_("Expected absolute pathname for libpthread in the"
- " inferior, but got %s."), obj->name);
+ " inferior, but got %s."), obj_name);
return 0;
}
- path = xmalloc (strlen (obj->name) + 1 + strlen (LIBTHREAD_DB_SO) + 1);
+ path = xmalloc (strlen (obj_name) + (subdir ? strlen (subdir) + 1 : 0)
+ + 1 + strlen (LIBTHREAD_DB_SO) + 1);
cleanup = make_cleanup (xfree, path);
- strcpy (path, obj->name);
+ strcpy (path, obj_name);
cp = strrchr (path, '/');
/* This should at minimum hit the first character. */
gdb_assert (cp != NULL);
- strcpy (cp + 1, LIBTHREAD_DB_SO);
- result = try_thread_db_load (path);
+ cp[1] = '\0';
+ if (subdir != NULL)
+ {
+ strcat (cp, subdir);
+ strcat (cp, "/");
+ }
+ strcat (cp, LIBTHREAD_DB_SO);
+
+ result = try_thread_db_load (path, 1);
do_cleanups (cleanup);
return result;
}
/* Handle $pdir in libthread-db-search-path.
- Look for libthread_db in the directory of libpthread.
+ Look for libthread_db in directory(libpthread)/SUBDIR.
+ SUBDIR may be NULL. It may also be something like "../lib64".
The result is true for success. */
static int
-try_thread_db_load_from_pdir (void)
+try_thread_db_load_from_pdir (const char *subdir)
{
struct objfile *obj;
+ if (!auto_load_thread_db)
+ return 0;
+
ALL_OBJFILES (obj)
- if (libpthread_name_p (obj->name))
+ if (libpthread_name_p (objfile_name (obj)))
{
- if (try_thread_db_load_from_pdir_1 (obj))
+ if (try_thread_db_load_from_pdir_1 (obj, subdir))
return 1;
/* We may have found the separate-debug-info version of
libpthread, and it may live in a directory without a matching
libthread_db. */
if (obj->separate_debug_objfile_backlink != NULL)
- return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink);
+ return try_thread_db_load_from_pdir_1 (obj->separate_debug_objfile_backlink,
+ subdir);
return 0;
}
static int
try_thread_db_load_from_sdir (void)
{
- return try_thread_db_load (LIBTHREAD_DB_SO);
+ return try_thread_db_load (LIBTHREAD_DB_SO, 0);
}
/* Try to load libthread_db from directory DIR of length DIR_LEN.
char *path;
int result;
+ if (!auto_load_thread_db)
+ return 0;
+
path = xmalloc (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1);
cleanup = make_cleanup (xfree, path);
memcpy (path, dir, dir_len);
path[dir_len] = '/';
strcpy (path + dir_len + 1, LIBTHREAD_DB_SO);
- result = try_thread_db_load (path);
+
+ result = try_thread_db_load (path, 1);
do_cleanups (cleanup);
return result;
static int
thread_db_load_search (void)
{
- const char *search_path = libthread_db_search_path;
- int rc = 0;
+ VEC (char_ptr) *dir_vec;
+ struct cleanup *cleanups;
+ char *this_dir;
+ int i, rc = 0;
+
+ dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path);
+ cleanups = make_cleanup_free_char_ptr_vec (dir_vec);
- while (*search_path)
+ for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i)
{
- const char *end = strchr (search_path, ':');
- const char *this_dir = search_path;
+ const int pdir_len = sizeof ("$pdir") - 1;
size_t this_dir_len;
- if (end)
- {
- this_dir_len = end - search_path;
- search_path += this_dir_len + 1;
- }
- else
- {
- this_dir_len = strlen (this_dir);
- search_path += this_dir_len;
- }
+ this_dir_len = strlen (this_dir);
- if (this_dir_len == sizeof ("$pdir") - 1
- && strncmp (this_dir, "$pdir", this_dir_len) == 0)
+ if (strncmp (this_dir, "$pdir", pdir_len) == 0
+ && (this_dir[pdir_len] == '\0'
+ || this_dir[pdir_len] == '/'))
{
- if (try_thread_db_load_from_pdir ())
+ char *subdir = NULL;
+ struct cleanup *free_subdir_cleanup
+ = make_cleanup (null_cleanup, NULL);
+
+ if (this_dir[pdir_len] == '/')
{
- rc = 1;
- break;
+ subdir = xmalloc (strlen (this_dir));
+ make_cleanup (xfree, subdir);
+ strcpy (subdir, this_dir + pdir_len + 1);
}
+ rc = try_thread_db_load_from_pdir (subdir);
+ do_cleanups (free_subdir_cleanup);
+ if (rc)
+ break;
}
- else if (this_dir_len == sizeof ("$sdir") - 1
- && strncmp (this_dir, "$sdir", this_dir_len) == 0)
+ else if (strcmp (this_dir, "$sdir") == 0)
{
if (try_thread_db_load_from_sdir ())
{
}
}
+ do_cleanups (cleanups);
if (libthread_db_debug)
printf_unfiltered (_("thread_db_load_search returning %d\n"), rc);
return rc;
struct objfile *obj;
ALL_OBJFILES (obj)
- if (libpthread_name_p (obj->name))
+ if (libpthread_name_p (objfile_name (obj)))
return 1;
return 0;
{
struct thread_db_info *info;
- info = get_thread_db_info (GET_PID (inferior_ptid));
+ info = get_thread_db_info (ptid_get_pid (inferior_ptid));
if (info != NULL)
return 1;
{
if (sigismember (&mask, i))
{
- if (signal_stop_update (target_signal_from_host (i), 0))
+ if (signal_stop_update (gdb_signal_from_host (i), 0))
sigaddset (&thread_stop_set, i);
- if (signal_print_update (target_signal_from_host (i), 0))
+ if (signal_print_update (gdb_signal_from_host (i), 0))
sigaddset (&thread_print_set, i);
thread_signals = 1;
}
return;
}
+/* This function is called via the new_objfile observer. */
+
static void
thread_db_new_objfile (struct objfile *objfile)
{
/* This observer must always be called with inferior_ptid set
correctly. */
- if (objfile != NULL)
+ if (objfile != NULL
+ /* libpthread with separate debug info has its debug info file already
+ loaded (and notified without successful thread_db initialization)
+ the time observer_notify_new_objfile is called for the library itself.
+ Static executables have their separate debug info loaded already
+ before the inferior has started. */
+ && objfile->separate_debug_objfile_backlink == NULL
+ /* Only check for thread_db if we loaded libpthread,
+ or if this is the main symbol file.
+ We need to check OBJF_MAINLINE to handle the case of debugging
+ a statically linked executable AND the symbol file is specified AFTER
+ the exec file is loaded (e.g., gdb -c core ; file foo).
+ For dynamically linked executables, libpthread can be near the end
+ of the list of shared libraries to load, and in an app of several
+ thousand shared libraries, this can otherwise be painful. */
+ && ((objfile->flags & OBJF_MAINLINE) != 0
+ || libpthread_name_p (objfile_name (objfile))))
check_for_thread_db ();
}
+/* This function is called via the inferior_created observer.
+ This handles the case of debugging statically linked executables. */
+
+static void
+thread_db_inferior_created (struct target_ops *target, int from_tty)
+{
+ check_for_thread_db ();
+}
+
/* 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
that wasn't already in our list. Returns true on success. */
const td_thrinfo_t *ti_p)
{
struct private_thread_info *private;
- struct thread_info *tp = NULL;
+ struct thread_info *tp;
td_err_e err;
struct thread_db_info *info;
thread ID. In the first case we don't need to do anything; in
the second case we should discard information about the dead
thread and attach to the new one. */
- if (in_thread_list (ptid))
+ tp = find_thread_ptid (ptid);
+ if (tp != NULL)
{
- tp = find_thread_ptid (ptid);
- gdb_assert (tp != NULL);
-
/* If tp->private is NULL, then GDB is already attached to this
thread, but we do not know anything about it. We can learn
about it here. This can only happen if we have some other
if (target_has_execution)
check_thread_signals ();
- if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE)
- return 0; /* A zombie thread -- do not attach. */
-
/* Under GNU/Linux, we have to attach to each and every thread. */
if (target_has_execution
- && tp == NULL
- && lin_lwp_attach_lwp (BUILD_LWP (ti_p->ti_lid, GET_PID (ptid))) < 0)
- return 0;
+ && tp == NULL)
+ {
+ int res;
+
+ res = lin_lwp_attach_lwp (ptid_build (ptid_get_pid (ptid),
+ ti_p->ti_lid, 0));
+ if (res < 0)
+ {
+ /* Error, stop iterating. */
+ return 0;
+ }
+ else if (res > 0)
+ {
+ /* Pretend this thread doesn't exist yet, and keep
+ iterating. */
+ return 1;
+ }
+
+ /* Otherwise, we sucessfully attached to the thread. */
+ }
/* Construct the thread's private data. */
private = xmalloc (sizeof (struct private_thread_info));
gdb_assert (ti_p->ti_tid != 0);
private->th = *th_p;
private->tid = ti_p->ti_tid;
+ if (ti_p->ti_state == TD_THR_UNKNOWN || ti_p->ti_state == TD_THR_ZOMBIE)
+ private->dying = 1;
/* Add the thread to GDB's thread list. */
if (tp == NULL)
else
tp->private = private;
- info = get_thread_db_info (GET_PID (ptid));
+ info = get_thread_db_info (ptid_get_pid (ptid));
/* Enable thread event reporting for this thread, except when
debugging a core file. */
}
static void
-thread_db_detach (struct target_ops *ops, char *args, int from_tty)
+thread_db_detach (struct target_ops *ops, const char *args, int from_tty)
{
struct target_ops *target_beneath = find_target_beneath (ops);
struct thread_db_info *info;
- info = get_thread_db_info (GET_PID (inferior_ptid));
+ info = get_thread_db_info (ptid_get_pid (inferior_ptid));
if (info)
{
remove_thread_event_breakpoints ();
}
- delete_thread_db_info (GET_PID (inferior_ptid));
+ delete_thread_db_info (ptid_get_pid (inferior_ptid));
}
target_beneath->to_detach (target_beneath, args, from_tty);
int loop = 0;
struct thread_db_info *info;
- info = get_thread_db_info (GET_PID (ptid));
+ info = get_thread_db_info (ptid_get_pid (ptid));
/* Bail out early if we're not at a thread event breakpoint. */
stop_pc = regcache_read_pc (regcache)
- - gdbarch_decr_pc_after_break (gdbarch);
+ - target_decr_pc_after_break (gdbarch);
if (stop_pc != info->td_create_bp_addr
&& stop_pc != info->td_death_bp_addr)
return;
if (err != TD_OK)
error (_("Cannot get thread info: %s"), thread_db_err_str (err));
- ptid = ptid_build (GET_PID (ptid), ti.ti_lid, 0);
+ ptid = ptid_build (ptid_get_pid (ptid), ti.ti_lid, 0);
switch (msg.event)
{
|| ourstatus->kind == TARGET_WAITKIND_SIGNALLED)
return ptid;
- info = get_thread_db_info (GET_PID (ptid));
+ info = get_thread_db_info (ptid_get_pid (ptid));
/* If this process isn't using thread_db, we're done. */
if (info == NULL)
{
/* New image, it may or may not end up using thread_db. Assume
not unless we find otherwise. */
- delete_thread_db_info (GET_PID (ptid));
+ delete_thread_db_info (ptid_get_pid (ptid));
if (!thread_db_list)
unpush_target (&thread_db_ops);
thread_db_find_new_threads_1 (ptid);
if (ourstatus->kind == TARGET_WAITKIND_STOPPED
- && ourstatus->value.sig == TARGET_SIGNAL_TRAP)
+ && ourstatus->value.sig == GDB_SIGNAL_TRAP)
/* Check for a thread event. */
check_event (ptid);
if (have_threads (ptid))
{
- /* Change ptids back into the higher level PID + TID format. If
- 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
- event gets postponed by other simultaneous events. In such a
- case, we want to just ignore the event and continue on. */
-
- ptid = thread_from_lwp (ptid);
- if (GET_PID (ptid) == -1)
- ourstatus->kind = TARGET_WAITKIND_SPURIOUS;
+ /* Fill in the thread's user-level thread id. */
+ thread_from_lwp (ptid);
}
return ptid;
{
struct target_ops *target_beneath = find_target_beneath (ops);
- delete_thread_db_info (GET_PID (inferior_ptid));
+ delete_thread_db_info (ptid_get_pid (inferior_ptid));
target_beneath->to_mourn_inferior (target_beneath);
error (_("find_new_threads_callback: cannot get thread info: %s"),
thread_db_err_str (err));
- if (ti.ti_state == TD_THR_UNKNOWN || ti.ti_state == TD_THR_ZOMBIE)
- return 0; /* A zombie -- ignore. */
-
if (ti.ti_tid == 0)
{
/* A thread ID of zero means that this is the main thread, but
static void
thread_db_find_new_threads_2 (ptid_t ptid, int until_no_new)
{
- td_err_e err;
+ td_err_e err = TD_OK;
struct thread_db_info *info;
- int pid = ptid_get_pid (ptid);
int i, loop;
- if (target_has_execution)
- {
- struct lwp_info *lp;
-
- /* In linux, we can only read memory through a stopped lwp. */
- ALL_LWPS (lp, ptid)
- if (lp->stopped && ptid_get_pid (lp->ptid) == pid)
- break;
-
- if (!lp)
- /* There is no stopped thread. Bail out. */
- return;
- }
-
- info = get_thread_db_info (GET_PID (ptid));
+ info = get_thread_db_info (ptid_get_pid (ptid));
/* Access an lwp we know is stopped. */
info->proc_handle.ptid = ptid;
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
"capture" all threads. */
- for (i = 0, loop = 0; loop < 4; ++i, ++loop)
- if (find_new_threads_once (info, i, NULL) != 0)
- /* Found some new threads. Restart the loop from beginning. */
- loop = -1;
+ for (i = 0, loop = 0; loop < 4 && err == TD_OK; ++i, ++loop)
+ if (find_new_threads_once (info, i, &err) != 0)
+ {
+ /* Found some new threads. Restart the loop from beginning. */
+ loop = -1;
+ }
}
else
- {
- find_new_threads_once (info, 0, &err);
- if (err != TD_OK)
- error (_("Cannot find new threads: %s"), thread_db_err_str (err));
- }
+ find_new_threads_once (info, 0, &err);
+
+ if (err != TD_OK)
+ error (_("Cannot find new threads: %s"), thread_db_err_str (err));
}
static void
static int
update_thread_core (struct lwp_info *info, void *closure)
{
- info->core = linux_nat_core_of_thread_1 (info->ptid);
+ info->core = linux_common_core_of_thread (info->ptid);
return 0;
}
thread_db_find_new_threads (struct target_ops *ops)
{
struct thread_db_info *info;
+ struct inferior *inf;
- info = get_thread_db_info (GET_PID (inferior_ptid));
+ ALL_INFERIORS (inf)
+ {
+ struct thread_info *thread;
- if (info == NULL)
- return;
+ if (inf->pid == 0)
+ continue;
- thread_db_find_new_threads_1 (inferior_ptid);
+ info = get_thread_db_info (inf->pid);
+ if (info == NULL)
+ continue;
+
+ thread = any_live_thread_of_process (inf->pid);
+ if (thread == NULL || thread->executing)
+ continue;
+
+ thread_db_find_new_threads_1 (thread->ptid);
+ }
if (target_has_execution)
iterate_over_lwps (minus_one_ptid /* iterate over all */,
tid = thread_info->private->tid;
snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)",
- tid, GET_LWP (ptid));
+ tid, ptid_get_lwp (ptid));
return buf;
}
beneath = find_target_beneath (ops);
- if (beneath->to_pid_to_str (beneath, ptid))
- return beneath->to_pid_to_str (beneath, ptid);
-
- return normal_pid_to_str (ptid);
+ return beneath->to_pid_to_str (beneath, ptid);
}
/* Return a string describing the state of the thread specified by
INFO. */
static char *
-thread_db_extra_thread_info (struct thread_info *info)
+thread_db_extra_thread_info (struct target_ops *self,
+ struct thread_info *info)
{
if (info->private == NULL)
return NULL;
psaddr_t address;
struct thread_db_info *info;
- info = get_thread_db_info (GET_PID (ptid));
-
- /* glibc doesn't provide the needed interface. */
- if (!info->td_thr_tls_get_addr_p)
- throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR,
- _("No TLS library support"));
-
- /* Caller should have verified that lm != 0. */
- gdb_assert (lm != 0);
+ info = get_thread_db_info (ptid_get_pid (ptid));
/* Finally, get the address of the variable. */
- /* Note the cast through uintptr_t: this interface only works if
- 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. */
- err = info->td_thr_tls_get_addr_p (&thread_info->private->th,
- (psaddr_t)(uintptr_t) lm,
- offset, &address);
+ if (lm != 0)
+ {
+ /* glibc doesn't provide the needed interface. */
+ if (!info->td_thr_tls_get_addr_p)
+ throw_error (TLS_NO_LIBRARY_SUPPORT_ERROR,
+ _("No TLS library support"));
+
+ /* Note the cast through uintptr_t: this interface only works if
+ 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. */
+ err = info->td_thr_tls_get_addr_p (&thread_info->private->th,
+ (psaddr_t)(uintptr_t) lm,
+ offset, &address);
+ }
+ else
+ {
+ /* If glibc doesn't provide the needed interface throw an error
+ that LM is zero - normally cases it should not be. */
+ if (!info->td_thr_tlsbase_p)
+ throw_error (TLS_LOAD_MODULE_NOT_FOUND_ERROR,
+ _("TLS load module not found"));
+
+ /* This code path handles the case of -static -pthread executables:
+ https://sourceware.org/ml/libc-help/2014-03/msg00024.html
+ For older GNU libc r_debug.r_map is NULL. For GNU libc after
+ PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL.
+ The constant number 1 depends on GNU __libc_setup_tls
+ initialization of l_tls_modid to 1. */
+ err = info->td_thr_tlsbase_p (&thread_info->private->th,
+ 1, &address);
+ address = (char *) address + offset;
+ }
#ifdef THREAD_DB_HAS_TD_NOTALLOC
/* The memory hasn't been allocated, yet. */
}
beneath = find_target_beneath (ops);
- if (beneath->to_get_thread_local_address)
- return beneath->to_get_thread_local_address (beneath, ptid, lm, offset);
- else
- throw_error (TLS_GENERIC_ERROR,
- _("TLS not supported on this target"));
+ return beneath->to_get_thread_local_address (beneath, ptid, lm, offset);
}
/* Callback routine used to find a thread based on the TID part of
/* Implement the to_get_ada_task_ptid target method for this target. */
static ptid_t
-thread_db_get_ada_task_ptid (long lwp, long thread)
+thread_db_get_ada_task_ptid (struct target_ops *self, long lwp, long thread)
{
struct thread_info *thread_info;
static void
thread_db_resume (struct target_ops *ops,
- ptid_t ptid, int step, enum target_signal signo)
+ ptid_t ptid, int step, enum gdb_signal signo)
{
struct target_ops *beneath = find_target_beneath (ops);
struct thread_db_info *info;
if (ptid_equal (ptid, minus_one_ptid))
- info = get_thread_db_info (GET_PID (inferior_ptid));
+ info = get_thread_db_info (ptid_get_pid (inferior_ptid));
else
- info = get_thread_db_info (GET_PID (ptid));
+ info = get_thread_db_info (ptid_get_pid (ptid));
/* This workaround is only needed for child fork lwps stopped in a
PTRACE_O_TRACEFORK event. When the inferior is resumed, the
beneath->to_resume (beneath, ptid, step, signo);
}
+/* qsort helper function for info_auto_load_libthread_db, sort the
+ thread_db_info pointers primarily by their FILENAME and secondarily by their
+ PID, both in ascending order. */
+
+static int
+info_auto_load_libthread_db_compare (const void *ap, const void *bp)
+{
+ struct thread_db_info *a = *(struct thread_db_info **) ap;
+ struct thread_db_info *b = *(struct thread_db_info **) bp;
+ int retval;
+
+ retval = strcmp (a->filename, b->filename);
+ if (retval)
+ return retval;
+
+ return (a->pid > b->pid) - (a->pid - b->pid);
+}
+
+/* Implement 'info auto-load libthread-db'. */
+
+static void
+info_auto_load_libthread_db (char *args, int from_tty)
+{
+ struct ui_out *uiout = current_uiout;
+ const char *cs = args ? args : "";
+ struct thread_db_info *info, **array;
+ unsigned info_count, unique_filenames;
+ size_t max_filename_len, max_pids_len, pids_len;
+ struct cleanup *back_to;
+ char *pids;
+ int i;
+
+ cs = skip_spaces_const (cs);
+ if (*cs)
+ error (_("'info auto-load libthread-db' does not accept any parameters"));
+
+ info_count = 0;
+ for (info = thread_db_list; info; info = info->next)
+ if (info->filename != NULL)
+ info_count++;
+
+ array = xmalloc (sizeof (*array) * info_count);
+ back_to = make_cleanup (xfree, array);
+
+ info_count = 0;
+ for (info = thread_db_list; info; info = info->next)
+ if (info->filename != NULL)
+ array[info_count++] = info;
+
+ /* Sort ARRAY by filenames and PIDs. */
+
+ qsort (array, info_count, sizeof (*array),
+ info_auto_load_libthread_db_compare);
+
+ /* Calculate the number of unique filenames (rows) and the maximum string
+ length of PIDs list for the unique filenames (columns). */
+
+ unique_filenames = 0;
+ max_filename_len = 0;
+ max_pids_len = 0;
+ pids_len = 0;
+ for (i = 0; i < info_count; i++)
+ {
+ int pid = array[i]->pid;
+ size_t this_pid_len;
+
+ for (this_pid_len = 0; pid != 0; pid /= 10)
+ this_pid_len++;
+
+ if (i == 0 || strcmp (array[i - 1]->filename, array[i]->filename) != 0)
+ {
+ unique_filenames++;
+ max_filename_len = max (max_filename_len,
+ strlen (array[i]->filename));
+
+ if (i > 0)
+ {
+ pids_len -= strlen (", ");
+ max_pids_len = max (max_pids_len, pids_len);
+ }
+ pids_len = 0;
+ }
+ pids_len += this_pid_len + strlen (", ");
+ }
+ if (i)
+ {
+ pids_len -= strlen (", ");
+ max_pids_len = max (max_pids_len, pids_len);
+ }
+
+ /* Table header shifted right by preceding "libthread-db: " would not match
+ its columns. */
+ if (info_count > 0 && args == auto_load_info_scripts_pattern_nl)
+ ui_out_text (uiout, "\n");
+
+ make_cleanup_ui_out_table_begin_end (uiout, 2, unique_filenames,
+ "LinuxThreadDbTable");
+
+ ui_out_table_header (uiout, max_filename_len, ui_left, "filename",
+ "Filename");
+ ui_out_table_header (uiout, pids_len, ui_left, "PIDs", "Pids");
+ ui_out_table_body (uiout);
+
+ pids = xmalloc (max_pids_len + 1);
+ make_cleanup (xfree, pids);
+
+ /* Note I is incremented inside the cycle, not at its end. */
+ for (i = 0; i < info_count;)
+ {
+ struct cleanup *chain = make_cleanup_ui_out_tuple_begin_end (uiout, NULL);
+ char *pids_end;
+
+ info = array[i];
+ ui_out_field_string (uiout, "filename", info->filename);
+ pids_end = pids;
+
+ while (i < info_count && strcmp (info->filename, array[i]->filename) == 0)
+ {
+ if (pids_end != pids)
+ {
+ *pids_end++ = ',';
+ *pids_end++ = ' ';
+ }
+ pids_end += xsnprintf (pids_end, &pids[max_pids_len + 1] - pids_end,
+ "%u", array[i]->pid);
+ gdb_assert (pids_end < &pids[max_pids_len + 1]);
+
+ i++;
+ }
+ *pids_end = '\0';
+
+ ui_out_field_string (uiout, "pids", pids);
+
+ ui_out_text (uiout, "\n");
+ do_cleanups (chain);
+ }
+
+ do_cleanups (back_to);
+
+ if (info_count == 0)
+ ui_out_message (uiout, 0, _("No auto-loaded libthread-db.\n"));
+}
+
static void
init_thread_db_ops (void)
{
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_magic = OPS_MAGIC;
+
+ complete_target_initialization (&thread_db_ops);
}
/* Provide a prototype to silence -Wmissing-prototypes. */
_initialize_thread_db (void)
{
init_thread_db_ops ();
- add_target (&thread_db_ops);
/* Defer loading of libthread_db.so until inferior is running.
This allows gdb to load correct libthread_db for a given
NULL,
&setlist, &showlist);
- add_setshow_zinteger_cmd ("libthread-db", class_maintenance,
- &libthread_db_debug, _("\
+ add_setshow_zuinteger_cmd ("libthread-db", class_maintenance,
+ &libthread_db_debug, _("\
Set libthread-db debugging."), _("\
Show libthread-db debugging."), _("\
When non-zero, libthread-db debugging is enabled."),
- NULL,
- show_libthread_db_debug,
- &setdebuglist, &showdebuglist);
+ NULL,
+ show_libthread_db_debug,
+ &setdebuglist, &showdebuglist);
+
+ add_setshow_boolean_cmd ("libthread-db", class_support,
+ &auto_load_thread_db, _("\
+Enable or disable auto-loading of inferior specific libthread_db."), _("\
+Show whether auto-loading inferior specific libthread_db is enabled."), _("\
+If enabled, libthread_db will be searched in 'set libthread-db-search-path'\n\
+locations to load libthread_db compatible with the inferior.\n\
+Standard system libthread_db still gets loaded even with this option off.\n\
+This options has security implications for untrusted inferiors."),
+ NULL, show_auto_load_thread_db,
+ auto_load_set_cmdlist_get (),
+ auto_load_show_cmdlist_get ());
+
+ add_cmd ("libthread-db", class_info, info_auto_load_libthread_db,
+ _("Print the list of loaded inferior specific libthread_db.\n\
+Usage: info auto-load libthread-db"),
+ auto_load_info_cmdlist_get ());
/* Add ourselves to objfile event chain. */
observer_attach_new_objfile (thread_db_new_objfile);
+
+ /* Add ourselves to inferior_created event chain.
+ This is needed to handle debugging statically linked programs where
+ the new_objfile observer won't get called for libpthread. */
+ observer_attach_inferior_created (thread_db_inferior_created);
}
projects / platform / upstream / binutils.git / blobdiff