43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
/* Helpers for On-demand PLT fixup for shared objects. ARC version.
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Copyright (C) 2020-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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/* PLT jump into resolver passes PC of PLTn, while _dl_fixup expects the
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address of corresponding .rela.plt entry.
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- @plt0: runtime pc of first plt entry (DT_PLTGOT)
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- @pltn: runtime pc of plt entry being resolved
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- @size: size of .plt.rela entry (unused). */
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static inline uintptr_t
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reloc_index (uintptr_t plt0, uintptr_t pltn, size_t size)
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{
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unsigned long int idx = pltn - plt0;
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/* PLT trampoline is 16 bytes. */
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idx /= 16;
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/* Exclude PLT0 and PLT1. */
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return idx - 2;
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}
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static inline uintptr_t
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reloc_offset (uintptr_t plt0, uintptr_t pltn)
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{
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size_t sz = sizeof (ElfW(Rela));
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return reloc_index (plt0, pltn, sz) * sz;
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}
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