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/* Get address of thread local variable. Copyright (C) 2002,2003 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 2002. 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, see <http://www.gnu.org/licenses/>. */ #include <link.h> #include "thread_dbP.h" /* Value used for dtv entries for which the allocation is delayed. */ # define TLS_DTV_UNALLOCATED ((void *) -1l) td_err_e td_thr_tls_get_addr (const td_thrhandle_t *th __attribute__ ((unused)), void *map_address __attribute__ ((unused)), size_t offset __attribute__ ((unused)), void **address __attribute__ ((unused))) { #if defined(USE_TLS) && USE_TLS size_t modid; union dtv pdtv, *dtvp; LOG ("td_thr_tls_get_addr"); /* Get the DTV pointer from the thread descriptor. */ if (ps_pdread (th->th_ta_p->ph, &((struct _pthread_descr_struct *) th->th_unique)->p_header.data.dtvp, &dtvp, sizeof dtvp) != PS_OK) return TD_ERR; /* XXX Other error value? */ /* Read the module ID from the link_map. */ if (ps_pdread (th->th_ta_p->ph, &((struct link_map *) map_address)->l_tls_modid, &modid, sizeof modid) != PS_OK) return TD_ERR; /* XXX Other error value? */ /* Get the corresponding entry in the DTV. */ if (ps_pdread (th->th_ta_p->ph, dtvp + modid, &pdtv, sizeof (union dtv)) != PS_OK) return TD_ERR; /* XXX Other error value? */ /* It could be that the memory for this module is not allocated for the given thread. */ if (pdtv.pointer == TLS_DTV_UNALLOCATED) /* There is not much we can do. */ return TD_NOTALLOC; *address = (char *) pdtv.pointer + offset; return TD_OK; #else return TD_ERR; #endif } |