sysdeps/i386/dl-tls.h

   1 /* Thread-local storage handling in the ELF dynamic linker.  i386 version.
   2    Copyright (C) 2002 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifdef USE_TLS
  21 /* Type used for the representation of TLS information in the GOT.  */
  22 struct tls_index
  23 {
  24   unsigned long int ti_module;
  25   unsigned long int ti_offset;
  26 };
  27
  28
  29 /* This is the prototype for the GNU version.  */
  30 extern void *___tls_get_addr (struct tls_index *ti)
  31      __attribute__ ((__regparm__ (1)));
  32
  33 /* The special thing about the x86 TLS ABI is that we have two
  34    variants of the __tls_get_addr function with different calling
  35    conventions.  The GNU version, which we are mostly concerned here,
  36    takes the parameter in a register.  The name is changed by adding
  37    an additional underscore at the beginning.  The Sun version uses
  38    the normal calling convention.  */
  39 void *
  40 __tls_get_addr (struct tls_index *ti)
  41 {
  42   return ___tls_get_addr (ti);
  43 }
  44
  45
  46 /* Prepare using the definition of __tls_get_addr in the generic
  47    version of this file.  */
  48 #define __tls_get_addr __attribute__ ((__regparm__ (1))) ___tls_get_addr
  49
  50 #endif  /* use TLS */