mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
/* Locate TLS data for a thread.
|
|
Copyright (C) 2003, 2006, 2007 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;
|
|
|
|
psaddr_t pd = th->th_unique;
|
|
if (pd == 0)
|
|
{
|
|
/* This is the fake handle for the main thread before libpthread
|
|
initialization. We are using 0 for its th_unique because we can't
|
|
trust that its thread register has been initialized. But we need
|
|
a real pointer to have any TLS access work. In case of dlopen'd
|
|
libpthread, initialization might not be for quite some time. So
|
|
try looking up the thread register now. Worst case, it's nonzero
|
|
uninitialized garbage and we get bogus results for TLS access
|
|
attempted too early. Tough. */
|
|
|
|
td_thrhandle_t main_th;
|
|
err = __td_ta_lookup_th_unique (th->th_ta_p, ps_getpid (th->th_ta_p->ph),
|
|
&main_th);
|
|
if (err == 0)
|
|
pd = main_th.th_unique;
|
|
if (pd == 0)
|
|
return TD_TLSDEFER;
|
|
}
|
|
|
|
/* Get the DTV pointer from the thread descriptor. */
|
|
err = DB_GET_FIELD (dtv, th->th_ta_p, pd, 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;
|
|
}
|