710-debian_thread-db-multiple-libraries.patch

這是一個實時嵌入式作業系統 實作了MCS51 ARM等MCU

     return err;
 
@@ -534,8 +563,10 @@ enable_thread_event_reporting (void)
 
   /* We cannot use the thread event reporting facility if these
      functions aren't available.  */
-  if (td_ta_event_addr_p == NULL || td_ta_set_event_p == NULL
-      || td_ta_event_getmsg_p == NULL || td_thr_event_enable_p == NULL)
+  if (current_pointers->td_ta_event_addr_p == NULL
+      || current_pointers->td_ta_set_event_p == NULL
+      || current_pointers->td_ta_event_getmsg_p == NULL
+      || current_pointers->td_thr_event_enable_p == NULL)
     return;
 
   /* Set the process wide mask saying which events we're interested in.  */
@@ -552,7 +583,7 @@ enable_thread_event_reporting (void)
 #endif
     td_event_addset (&events, TD_DEATH);
 
-  err = td_ta_set_event_p (thread_agent, &events);
+  err = current_pointers->td_ta_set_event_p (thread_agent, &events);
   if (err != TD_OK)
     {
       warning ("Unable to set global thread event mask: %s",
@@ -592,7 +623,7 @@ disable_thread_event_reporting (void)
   /* Set the process wide mask saying we aren't interested in any
      events anymore.  */
   td_event_emptyset (&events);
-  td_ta_set_event_p (thread_agent, &events);
+  current_pointers->td_ta_set_event_p (thread_agent, &events);
 
   /* Delete thread event breakpoints, if any.  */
   remove_thread_event_breakpoints ();
@@ -635,7 +666,6 @@ check_thread_signals (void)
 static void
 check_for_thread_db (void)
 {
-  td_err_e err;
   static int already_loaded;
 
   /* First time through, report that libthread_db was successfuly
@@ -644,19 +674,8 @@ check_for_thread_db (void)
 
   if (!already_loaded)
     {
-      Dl_info info;
-      const char *library = NULL;
-      if (dladdr ((*td_ta_new_p), &info) != 0)
-	library = info.dli_fname;
-
-      /* Try dlinfo?  */
-
-      if (library == NULL)
-	/* Paranoid - don't let a NULL path slip through.  */
-	library = LIBTHREAD_DB_SO;
-
       printf_unfiltered ("Using host libthread_db library \"%s\".\n",
-			 library);
+			 all_pointers->filename);
       already_loaded = 1;
     }
 
@@ -674,28 +693,34 @@ check_for_thread_db (void)
   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)
+  for (current_pointers = all_pointers;
+       current_pointers != NULL;
+       current_pointers = current_pointers->next)
     {
-    case TD_NOLIBTHREAD:
-      /* No thread library was detected.  */
-      break;
-
-    case TD_OK:
-      printf_unfiltered ("[Thread debugging using libthread_db enabled]\n");
+      td_err_e err;
+      err = current_pointers->td_ta_new_p (&proc_handle, &thread_agent);
+      switch (err)
+	{
+	case TD_NOLIBTHREAD:
+	  /* No thread library was detected.  */
+	  break;
 
-      /* The thread library was detected.  Activate the thread_db target.  */
-      push_target (&thread_db_ops);
-      using_thread_db = 1;
+	case TD_OK:
+	  printf_unfiltered ("[Thread debugging using libthread_db enabled]\n");
 
-      enable_thread_event_reporting ();
-      thread_db_find_new_threads ();
-      break;
+	  /* The thread library was detected.  Activate the thread_db target.  */
+	  push_target (&thread_db_ops);
+	  using_thread_db = 1;
+
+	  enable_thread_event_reporting ();
+	  thread_db_find_new_threads ();
+	  return;
 
-    default:
-      warning ("Cannot initialize thread debugging library: %s",
-	       thread_db_err_str (err));
-      break;
+	default:
+	  warning ("Cannot initialize thread debugging library: %s",
+		   thread_db_err_str (err));
+	  break;
+	}
     }
 }
 
@@ -766,7 +791,7 @@ attach_thread (ptid_t ptid, const td_thr
 #endif
 
   /* Enable thread event reporting for this thread.  */
-  err = td_thr_event_enable_p (th_p, 1);
+  err = current_pointers->td_thr_event_enable_p (th_p, 1);
   if (err != TD_OK)
     error ("Cannot enable thread event reporting for %s: %s",
 	   target_pid_to_str (ptid), thread_db_err_str (err));
@@ -892,7 +917,7 @@ check_event (ptid_t ptid)
 
   do
     {
-      err = td_ta_event_getmsg_p (thread_agent, &msg);
+      err = current_pointers->td_ta_event_getmsg_p (thread_agent, &msg);
       if (err != TD_OK)
 	{
 	  if (err == TD_NOMSG)
@@ -902,7 +927,7 @@ check_event (ptid_t ptid)
 		 thread_db_err_str (err));
 	}
 
-      err = td_thr_get_info_p (msg.th_p, &ti);
+      err = current_pointers->td_thr_get_info_p (msg.th_p, &ti);
       if (err != TD_OK)
 	error ("Cannot get thread info: %s", thread_db_err_str (err));
 
@@ -1015,12 +1040,14 @@ thread_db_fetch_registers (int regno)
   thread_info = find_thread_pid (inferior_ptid);
   thread_db_map_id2thr (thread_info, 1);
 
-  err = td_thr_getgregs_p (&thread_info->private->th, gregset);
+  err = current_pointers->td_thr_getgregs_p (&thread_info->private->th,
+					     gregset);
   if (err != TD_OK)
     error ("Cannot fetch general-purpose registers for thread %ld: %s",
 	   (long) GET_THREAD (inferior_ptid), thread_db_err_str (err));
 
-  err = td_thr_getfpregs_p (&thread_info->private->th, &fpregset);
+  err = current_pointers->td_thr_getfpregs_p (&thread_info->private->th,
+					      &fpregset);
   if (err != TD_OK)
     error ("Cannot get floating-point registers for thread %ld: %s",
 	   (long) GET_THREAD (inferior_ptid), thread_db_err_str (err));
@@ -1062,11 +1089,13 @@ thread_db_store_registers (int regno)
   fill_gregset ((gdb_gregset_t *) gregset, -1);
   fill_fpregset (&fpregset, -1);
 
-  err = td_thr_setgregs_p (&thread_info->private->th, gregset);
+  err = current_pointers->td_thr_setgregs_p (&thread_info->private->th,
+					     gregset);
   if (err != TD_OK)
     error ("Cannot store general-purpose registers for thread %ld: %s",
 	   (long) GET_THREAD (inferior_ptid), thread_db_err_str (err));
-  err = td_thr_setfpregs_p (&thread_info->private->th, &fpregset);
+  err = current_pointers->td_thr_setfpregs_p (&thread_info->private->th,
+					      &fpregset);
   if (err != TD_OK)
     error ("Cannot store floating-point registers  for thread %ld: %s",
 	   (long) GET_THREAD (inferior_ptid), thread_db_err_str (err));
@@ -1136,15 +1165,14 @@ thread_db_thread_alive (ptid_t ptid)
       if (!thread_info->private->th_valid)
 	return 0;
 
-      err = td_thr_validate_p (&thread_info->private->th);
+      err = current_pointers->td_thr_validate_p (&thread_info->private->th);
       if (err != TD_OK)
 	return 0;
 
       if (!thread_info->private->ti_valid)
 	{
-	  err =
-	    td_thr_get_info_p (&thread_info->private->th,
-			       &thread_info->private->ti);
+	  err = current_pointers->td_thr_get_info_p
+	    (&thread_info->private->th, &thread_info->private->ti);
 	  if (err != TD_OK)
 	    return 0;
 	  thread_info->private->ti_valid = 1;
@@ -1170,7 +1198,7 @@ find_new_threads_callback (const td_thrh
   td_err_e err;
   ptid_t ptid;
 
-  err = td_thr_get_info_p (th_p, &ti);
+  err = current_pointers->td_thr_get_info_p (th_p, &ti);
   if (err != TD_OK)
     error ("find_new_threads_callback: cannot get thread info: %s",
 	   thread_db_err_str (err));
@@ -1192,9 +1220,10 @@ thread_db_find_new_threads (void)
   td_err_e err;
 
   /* Iterate over all user-space threads to discover new threads.  */
-  err = td_ta_thr_iter_p (thread_agent, find_new_threads_callback, NULL,
-			  TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
-			  TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS);
+  err = current_pointers->td_ta_thr_iter_p
+    (thread_agent, find_new_threads_callback, NULL,
+     TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
+     TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS);
   if (err != TD_OK)
     error ("Cannot find new threads: %s", thread_db_err_str (err));
 }
@@ -1257,7 +1286,7 @@ thread_db_get_thread_local_address (ptid
       struct thread_info *thread_info;
 
       /* glibc doesn't provide the needed interface.  */
-      if (!td_thr_tls_get_addr_p)
+      if (!current_pointers->td_thr_tls_get_addr_p)
 	error ("Cannot find thread-local variables in this thread library.");
 
       /* Get the address of the link map for this objfile.  */
@@ -1279,8 +1308,8 @@ thread_db_get_thread_local_address (ptid
       thread_db_map_id2thr (thread_info, 1);
 
       /* Finally, get the address of the variable.  */
-      err = td_thr_tls_get_addr_p (&thread_info->private->th, (void *) lm,
-				   offset, &address);
+      err = current_pointers->td_thr_tls_get_addr_p
+	(&thread_info->private->th, (void *) lm, offset, &address);
 
 #ifdef THREAD_DB_HAS_TD_NOTALLOC
       /* The memory hasn't been allocated, yet.  */
@@ -1360,17 +1389,49 @@ init_thread_db_ops (void)
 void
 _initialize_thread_db (void)
 {
+  struct thread_db_pointers *ptrs;
+  const char *p;
+
   /* Only initialize the module if we can load libthread_db.  */
-  if (thread_db_load ())
-    {
-      init_thread_db_ops ();
-      add_target (&thread_db_ops);
+  ptrs = thread_db_load (LIBTHREAD_DB_SO);
+  if (ptrs == NULL)
+    return;
+
+  all_pointers = ptrs;
 
-      /* Add ourselves to objfile event chain.  */
-      target_new_objfile_chain = deprecated_target_new_objfile_hook;
-      deprecated_target_new_objfile_hook = thread_db_new_objfile;
+  /* Some GNU/Linux systems have more than one binary-compatible copy
+     of libthread_db.  If we can find a second one, load that too.
+     The inferior may force the use of a different threading package
+     than we expect.  Our guess for the location is somewhat hokey:
+     strip out anything between /lib (or /lib64) and LIBTHREAD_DB_SO.
+     If we loaded the NPTL libthread_db by default, this may find us
+     the LinuxThreads copy.  */
+  p = strrchr (ptrs->filename, '/');
+  while (p != NULL && p > ptrs->filename)
+    {
+      const char *component;
 
-      /* Register ourselves for the new inferior observer.  */
-      observer_attach_inferior_created (check_for_thread_db_observer);
+      component = memrchr (ptrs->filename, '/', p - ptrs->filename);
+      if (component != NULL && strncmp (component, "/lib", 4) == 0)
+	{
+	  char *new_name = xmalloc (p - ptrs->filename + 2
+				    + strlen (LIBTHREAD_DB_SO));
+	  memcpy (new_name, ptrs->filename, p - ptrs->filename + 1);
+	  strcpy (new_name + (p - ptrs->filename) + 1, LIBTHREAD_DB_SO);
+	  ptrs->next = thread_db_load (new_name);
+	  xfree (new_name);
+	  break;
+	}
+      p = component;
     }
+
+  init_thread_db_ops ();
+  add_target (&thread_db_ops);
+
+  /* Add ourselves to objfile event chain.  */
+  target_new_objfile_chain = deprecated_target_new_objfile_hook;
+  deprecated_target_new_objfile_hook = thread_db_new_objfile;
+
+  /* Register ourselves for the new inferior observer.  */
+  observer_attach_inferior_created (check_for_thread_db_observer);
 }