static void
check_for_thread_db (void)
{
td_err_e err;
if (td_ta_new_p == NULL)
return;
/* Don't try to attach to a dead target if there is no core file. */
if (!target_has_execution && core_bfd == NULL)
return;
/* Nothing to do. The thread library was already detected and the
target vector was already activated. */
if (fbsd_thread_active)
return;
/* Now, initialize libthread_db. This needs to be done after the
shared libraries are located because it needs information from
the user's thread library. */
err = td_init_p ();
if (err != TD_OK)
{
warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err));
return;
}
/* Initialize the structure that identifies the child process. Note
that at this point there is no guarantee that we actually have a
child process. */
proc_handle.pid = GET_PID (inferior_ptid);
/* Now attempt to open a connection to the thread library. */
err = td_ta_new_p (&proc_handle, &thread_agent);
switch (err)
{
case TD_NOLIBTHREAD:
/* No thread library was detected. */
break;
case TD_OK:
/* The thread library was detected. Activate the thread_db target. */
push_target(&fbsd_thread_ops);
fbsd_thread_present = 1;
fbsd_thread_activate();
break;
default:
warning ("Cannot initialize thread debugging library: %s",
thread_db_err_str (err));
break;
}
}
static int
thread_db_load (void)
{
void *handle;
td_err_e err;
handle = dlopen (LIBTHREAD_DB_SO, RTLD_NOW);
if (handle == NULL)
return 0;
#define resolve(X) \
if (!(X##_p = dlsym (handle, #X))) \
return 0;
resolve(td_init);
resolve(td_ta_new);
resolve(td_ta_delete);
resolve(td_ta_map_id2thr);
resolve(td_ta_map_lwp2thr);
resolve(td_ta_thr_iter);
resolve(td_thr_get_info);
#ifdef PT_GETXMMREGS
resolve(td_thr_getxmmregs);
#endif
resolve(td_thr_getfpregs);
resolve(td_thr_getgregs);
#ifdef PT_GETXMMREGS
resolve(td_thr_setxmmregs);
#endif
resolve(td_thr_setfpregs);
resolve(td_thr_setgregs);
resolve(td_thr_sstep);
resolve(td_ta_tsd_iter);
resolve(td_thr_dbsuspend);
resolve(td_thr_dbresume);
resolve(td_thr_tls_get_addr);
/* Initialize the library. */
err = td_init_p ();
if (err != TD_OK)
{
warning ("Cannot initialize libthread_db: %s", thread_db_err_str (err));
return 0;
}
/* These are not essential. */
td_ta_event_addr_p = dlsym (handle, "td_ta_event_addr");
td_ta_set_event_p = dlsym (handle, "td_ta_set_event");
td_ta_event_getmsg_p = dlsym (handle, "td_ta_event_getmsg");
td_thr_event_enable_p = dlsym (handle, "td_thr_event_enable");
td_thr_tls_get_addr_p = dlsym (handle, "td_thr_tls_get_addr");
return 1;
}
