ports/sysdeps/arm/dl-tlsdesc.h

   1 /* Thread-local storage descriptor handling in the ELF dynamic linker.
   2    ARM version.
   3    Copyright (C) 2005, 2010 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; witout even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _ARM_DL_TLSDESC_H
  21 # define _ARM_DL_TLSDESC_H 1
  22
  23 /* Use this to access DT_TLSDESC_PLT and DT_TLSDESC_GOT.  */
  24 #ifndef ADDRIDX
  25 # define ADDRIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \
  26                        + DT_EXTRANUM + DT_VALNUM + DT_ADDRTAGIDX (tag))
  27 #endif
  28
  29 /* Type used to represent a TLS descriptor in the GOT.  */
  30 struct tlsdesc
  31 {
  32   union
  33     {
  34       void *pointer;
  35       long value;
  36     } argument;
  37   ptrdiff_t (*entry)(struct tlsdesc *);
  38 };
  39
  40
  41 typedef struct dl_tls_index
  42 {
  43   unsigned long int ti_module;
  44   unsigned long int ti_offset;
  45 } tls_index;
  46
  47 /* Type used as the argument in a TLS descriptor for a symbol that
  48    needs dynamic TLS offsets.  */
  49 struct tlsdesc_dynamic_arg
  50 {
  51   tls_index tlsinfo;
  52   size_t gen_count;
  53 };
  54
  55 extern ptrdiff_t attribute_hidden
  56   _dl_tlsdesc_return(struct tlsdesc *),
  57   _dl_tlsdesc_undefweak(struct tlsdesc *),
  58   _dl_tlsdesc_resolve_hold(struct tlsdesc *),
  59   _dl_tlsdesc_lazy_resolver(struct tlsdesc *);
  60
  61 # ifdef SHARED
  62 extern void *_dl_make_tlsdesc_dynamic (struct link_map *map, size_t ti_offset);
  63
  64 extern ptrdiff_t attribute_hidden
  65   _dl_tlsdesc_dynamic(struct tlsdesc *);
  66 # endif
  67
  68 #endif