sysdeps/x86_64/dl-tlsdesc.h

   1 /* Thread-local storage descriptor handling in the ELF dynamic linker.
   2    x86_64 version.
   3    Copyright (C) 2005, 2008 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; without 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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef _X86_64_DL_TLSDESC_H
  22 # define _X86_64_DL_TLSDESC_H 1
  23
  24 /* Use this to access DT_TLSDESC_PLT and DT_TLSDESC_GOT.  */
  25 #ifndef ADDRIDX
  26 # define ADDRIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \
  27                        + DT_EXTRANUM + DT_VALNUM + DT_ADDRTAGIDX (tag))
  28 #endif
  29
  30 /* Type used to represent a TLS descriptor in the GOT.  */
  31 struct tlsdesc
  32 {
  33   ptrdiff_t (*entry)(struct tlsdesc *on_rax);
  34   void *arg;
  35 };
  36
  37 typedef struct dl_tls_index
  38 {
  39   unsigned long int ti_module;
  40   unsigned long int ti_offset;
  41 } tls_index;
  42
  43 /* Type used as the argument in a TLS descriptor for a symbol that
  44    needs dynamic TLS offsets.  */
  45 struct tlsdesc_dynamic_arg
  46 {
  47   tls_index tlsinfo;
  48   size_t gen_count;
  49 };
  50
  51 extern ptrdiff_t attribute_hidden
  52   _dl_tlsdesc_return(struct tlsdesc *on_rax),
  53   _dl_tlsdesc_undefweak(struct tlsdesc *on_rax),
  54   _dl_tlsdesc_resolve_rela(struct tlsdesc *on_rax),
  55   _dl_tlsdesc_resolve_hold(struct tlsdesc *on_rax);
  56
  57 # ifdef SHARED
  58 extern void *internal_function _dl_make_tlsdesc_dynamic (struct link_map *map,
  59                                                          size_t ti_offset);
  60
  61 extern ptrdiff_t attribute_hidden _dl_tlsdesc_dynamic(struct tlsdesc *);
  62 # endif
  63
  64 #endif