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/* Helpers for On-demand PLT fixup for shared objects. ARC version.
Copyright (C) 2020-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
/* PLT jump into resolver passes PC of PLTn, while _dl_fixup expects the
address of corresponding .rela.plt entry.
- @plt0: runtime pc of first plt entry (DT_PLTGOT)
- @pltn: runtime pc of plt entry being resolved
- @size: size of .plt.rela entry (unused). */
static inline uintptr_t
reloc_index (uintptr_t plt0, uintptr_t pltn, size_t size)
{
unsigned long int idx = pltn - plt0;
/* PLT trampoline is 16 bytes. */
idx /= 16;
/* Exclude PLT0 and PLT1. */
return idx - 2;
}
static inline uintptr_t
reloc_offset (uintptr_t plt0, uintptr_t pltn)
{
size_t sz = sizeof (ElfW(Rela));
return reloc_index (plt0, pltn, sz) * sz;
}
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