From a319d590551ff74bbc4de51243e2d5f20ac4c7fd Mon Sep 17 00:00:00 2001 From: Austin Foxley Date: Sat, 17 Oct 2009 12:32:38 -0700 Subject: libpthread/nptl_db: debugging support for nptl Signed-off-by: Austin Foxley --- libpthread/nptl_db/td_thr_tlsbase.c | 55 +++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 libpthread/nptl_db/td_thr_tlsbase.c (limited to 'libpthread/nptl_db/td_thr_tlsbase.c') 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; +} -- cgit v1.2.3