diff options
Diffstat (limited to 'sysdeps/arc/dl-runtime.h')
-rw-r--r-- | sysdeps/arc/dl-runtime.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/sysdeps/arc/dl-runtime.h b/sysdeps/arc/dl-runtime.h new file mode 100644 index 0000000000..6597d93bac --- /dev/null +++ b/sysdeps/arc/dl-runtime.h @@ -0,0 +1,42 @@ +/* Helpers for On-demand PLT fixup for shared objects. ARC version. + Copyright (C) 2020 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; +} |