libpthread/nptl_db: debugging support for nptl

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>

1 files changed, 91 insertions, 0 deletions

diff --git a/libpthread/nptl_db/td_thr_validate.c b/libpthread/nptl_db/td_thr_validate.c
new file mode 100644
index 000000000..19ee940d6
--- /dev/null
+++ b/libpthread/nptl_db/td_thr_validate.c
@@ -0,0 +1,91 @@
+/* Validate a thread handle.
+   Copyright (C) 1999, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 1999.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include "thread_dbP.h"
+#include <stdbool.h>
+
+static td_err_e
+check_thread_list (const td_thrhandle_t *th, psaddr_t head, bool *uninit)
+{
+  td_err_e err;
+  psaddr_t next, ofs;
+
+  err = DB_GET_FIELD (next, th->th_ta_p, head, list_t, next, 0);
+  if (err == TD_OK)
+    {
+      if (next == 0)
+	{
+	  *uninit = true;
+	  return TD_NOTHR;
+	}
+      err = DB_GET_FIELD_ADDRESS (ofs, th->th_ta_p, 0, pthread, list, 0);
+    }
+
+  while (err == TD_OK)
+    {
+      if (next == head)
+	return TD_NOTHR;
+
+      if (next - (ofs - (psaddr_t) 0) == th->th_unique)
+	return TD_OK;
+
+      err = DB_GET_FIELD (next, th->th_ta_p, next, list_t, next, 0);
+    }
+
+  return err;
+}
+
+
+td_err_e
+td_thr_validate (const td_thrhandle_t *th)
+{
+  td_err_e err;
+  psaddr_t list = NULL;
+
+  LOG ("td_thr_validate");
+
+  /* First check the list with threads using user allocated stacks.  */
+  bool uninit = false;
+  err = DB_GET_SYMBOL (list, th->th_ta_p, __stack_user);
+  if (err == TD_OK)
+    err = check_thread_list (th, list, &uninit);
+
+  /* If our thread is not on this list search the list with stack
+     using implementation allocated stacks.  */
+  if (err == TD_NOTHR)
+    {
+      err = DB_GET_SYMBOL (list, th->th_ta_p, stack_used);
+      if (err == TD_OK)
+	err = check_thread_list (th, list, &uninit);
+
+      if (err == TD_NOTHR && uninit)
+	{
+	  /* __pthread_initialize_minimal has not run yet.
+	     But the main thread still has a valid ID.  */
+	  td_thrhandle_t main_th;
+	  err = td_ta_map_lwp2thr (th->th_ta_p,
+				   ps_getpid (th->th_ta_p->ph), &main_th);
+	  if (err == TD_OK && th->th_unique != main_th.th_unique)
+	    err = TD_NOTHR;
+	}
+    }
+
+  return err;
+}