libpthread/nptl_db: debugging support for nptl

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

1 files changed, 55 insertions, 0 deletions

diff --git a/libpthread/nptl_db/td_thr_tlsbase.c b/libpthread/nptl_db/td_thr_tlsbase.c
new file mode 100644
index 000000000..aaeda6f3c
--- /dev/null
+++ b/libpthread/nptl_db/td_thr_tlsbase.c
@@ -0,0 +1,55 @@
+/* Locate TLS data for a thread.
+   Copyright (C) 2003, 2006 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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"
+
+td_err_e
+td_thr_tlsbase (const td_thrhandle_t *th,
+		unsigned long int modid,
+		psaddr_t *base)
+{
+  td_err_e err;
+  psaddr_t dtv, dtvslot, dtvptr;
+
+  if (modid < 1)
+    return TD_NOTLS;
+
+  /* Get the DTV pointer from the thread descriptor.  */
+  err = DB_GET_FIELD (dtv, th->th_ta_p, th->th_unique, pthread, dtvp, 0);
+  if (err != TD_OK)
+    return err;
+
+  /* Find the corresponding entry in the DTV.  */
+  err = DB_GET_FIELD_ADDRESS (dtvslot, th->th_ta_p, dtv, dtv, dtv, modid);
+  if (err != TD_OK)
+    return err;
+
+  /* Extract the TLS block address from that DTV slot.  */
+  err = DB_GET_FIELD (dtvptr, th->th_ta_p, dtvslot, dtv_t, pointer_val, 0);
+  if (err != TD_OK)
+    return err;
+
+  /* It could be that the memory for this module is not allocated for
+     the given thread.  */
+  if ((uintptr_t) dtvptr & 1)
+    return TD_TLSDEFER;
+
+  *base = dtvptr;
+  return TD_OK;
+}