1  /* Helpers for On-demand PLT fixup for shared objects.  x86_64 version.
       2     Copyright (C) 2020-2023 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, write to the Free
      17     Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
      18     02111-1307 USA.  */
      19  
      20  /* The ABI calls for the PLT stubs to pass the index of the relocation
      21     and not its offset.  In _dl_profile_fixup and _dl_audit_pltexit we
      22     also use the index.  Therefore it is wasteful to compute the offset
      23     in the trampoline just to reverse the operation immediately
      24     afterwards.  */
      25  static inline uintptr_t
      26  reloc_offset (uintptr_t plt0, uintptr_t pltn)
      27  {
      28    return pltn * sizeof (ElfW(Rela));
      29  }
      30  
      31  static inline uintptr_t
      32  reloc_index (uintptr_t plt0, uintptr_t pltn, size_t size)
      33  {
      34    return pltn;
      35  }