1/* Helpers for On-demand PLT fixup for shared objects. x86_64 version.
2 Copyright (C) 2020 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_call_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. */
25static inline uintptr_t
26reloc_offset (uintptr_t plt0, uintptr_t pltn)
27{
28 return pltn * sizeof (ElfW(Rela));
29}
30
31static inline uintptr_t
32reloc_index (uintptr_t plt0, uintptr_t pltn, size_t size)
33{
34 return pltn;
35}
36