nptl_db/td_thr_tls_get_addr.c

   1 /* Get address of thread local variable.
   2    Copyright (C) 2002-2022 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <link.h>
  20 #include "thread_dbP.h"
  21
  22 td_err_e
  23 td_thr_tls_get_addr (const td_thrhandle_t *th,
  24                      psaddr_t map_address, size_t offset, psaddr_t *address)
  25 {
  26   td_err_e err;
  27   psaddr_t modid;
  28
  29   /* Get the TLS module ID from the `struct link_map' in the inferior.  */
  30   err = DB_GET_FIELD (modid, th->th_ta_p, map_address, link_map,
  31                       l_tls_modid, 0);
  32   if (err == TD_NOCAPAB)
  33     return TD_NOAPLIC;
  34   if (err == TD_OK)
  35     {
  36       err = td_thr_tlsbase (th, (uintptr_t) modid, address);
  37       if (err == TD_OK)
  38         *address += offset;
  39     }
  40   return err;
  41 }