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/*
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* libhugetlbfs - Easy use of Linux hugepages
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* Copyright (C) 2008 Adam Litke, IBM Corporation.
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*
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* This 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
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful, but
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* 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <elf.h>
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#include <link.h>
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#include "libhugetlbfs_internal.h"
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/*
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* The powerpc 64-bit ELF ABI defines the location and size of the plt as
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* follows (see the ELF ABI and powerpc64 supplement for details):
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*
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* Location: (data segment p_vaddr) + (data segment p_filesz)
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* Size: (dynamic symbol table DT_PTRELSZ entry) + 24
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*
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* plt entries have likely been initialized when the libhugetlbfs remapping
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* code runs, we must copy these entries when preparing the data segment. Tell
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* the arch-independent code how many bytes to copy.
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*/
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ElfW(Word) plt_extrasz(ElfW(Dyn) *dyntab)
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{
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int i;
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ElfW(Word) pltrelsz = 0;
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/* Find the needed information in the dynamic section */
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for (i = 0; dyntab[i].d_tag != DT_NULL; i++)
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if (dyntab[i].d_tag == DT_PLTRELSZ)
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pltrelsz = dyntab[i].d_un.d_val;
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/* pltrelsz indicates the size of all plt entries used to cache
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* symbol lookups, but does not include the reserved entry at PLT[0].
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* 24 bytes is the ABI-defined size of a plt entry.
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*/
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if (pltrelsz)
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return pltrelsz + 24;
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else
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return 0;
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}
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