1  /* Thread-local storage handling in the ELF dynamic linker.  i386 version.
       2     Copyright (C) 2002-2023 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  
      20  /* Type used for the representation of TLS information in the GOT.  */
      21  typedef struct dl_tls_index
      22  {
      23    unsigned long int ti_module;
      24    unsigned long int ti_offset;
      25  } tls_index;
      26  
      27  
      28  #ifdef SHARED
      29  /* This is the prototype for the GNU version.  */
      30  extern void *___tls_get_addr (tls_index *ti)
      31       __attribute__ ((__regparm__ (1)));
      32  extern void *___tls_get_addr_internal (tls_index *ti)
      33       __attribute__ ((__regparm__ (1))) attribute_hidden;
      34  
      35  # if IS_IN (rtld)
      36  /* The special thing about the x86 TLS ABI is that we have two
      37     variants of the __tls_get_addr function with different calling
      38     conventions.  The GNU version, which we are mostly concerned here,
      39     takes the parameter in a register.  The name is changed by adding
      40     an additional underscore at the beginning.  The Sun version uses
      41     the normal calling convention.  */
      42  void *
      43  __tls_get_addr (tls_index *ti)
      44  {
      45    return ___tls_get_addr_internal (ti);
      46  }
      47  
      48  
      49  /* Prepare using the definition of __tls_get_addr in the generic
      50     version of this file.  */
      51  # define __tls_get_addr __attribute__ ((__regparm__ (1))) ___tls_get_addr
      52  strong_alias (___tls_get_addr, ___tls_get_addr_internal)
      53  rtld_hidden_proto (___tls_get_addr)
      54  rtld_hidden_def (___tls_get_addr)
      55  #else
      56  
      57  /* Users should get the better interface.  */
      58  # define __tls_get_addr ___tls_get_addr
      59  
      60  # endif
      61  #endif