1  /* Thread-local storage handling in the ELF dynamic linker.
       2     Copyright (C) 2022-2023 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  /* Type used for the representation of TLS information in the GOT.  */
      20  typedef struct
      21  {
      22    unsigned long int ti_module;
      23    unsigned long int ti_offset;
      24  } tls_index;
      25  
      26  /* The thread pointer points to the first static TLS block.  */
      27  #define TLS_TP_OFFSET 0
      28  
      29  /* Dynamic thread vector pointers point to the start of each
      30     TLS block.  */
      31  #define TLS_DTV_OFFSET 0
      32  
      33  /* Compute the value for a GOTTPREL reloc.  */
      34  #define TLS_TPREL_VALUE(sym_map, sym) \
      35    ((sym_map)->l_tls_offset + (sym)->st_value - TLS_TP_OFFSET)
      36  
      37  /* Compute the value for a DTPREL reloc.  */
      38  #define TLS_DTPREL_VALUE(sym) ((sym)->st_value - TLS_DTV_OFFSET)
      39  
      40  extern void *__tls_get_addr (tls_index *ti);
      41  
      42  #define GET_ADDR_OFFSET (ti->ti_offset + TLS_DTV_OFFSET)
      43  #define __TLS_GET_ADDR(__ti) (__tls_get_addr (__ti) - TLS_DTV_OFFSET)
      44  
      45  /* Value used for dtv entries for which the allocation is delayed.  */
      46  #define TLS_DTV_UNALLOCATED ((void *) -1l)