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/* Private declarations for delayed IFUNC processing.
Copyright (C) 2017 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
<http://www.gnu.org/licenses/>. */
#ifndef DL_IFUNC_H
#define DL_IFUNC_H
#include <link.h>
/* All functions declared in this file must be called while the global
rtld lock is acquired. */
/* Apply all pending IFUNC relocations in the search scope of the new
link map. Deallocate all auxiliary allocations. */
void _dl_ifunc_apply_relocations (struct link_map *new)
attribute_hidden internal_function;
/* Clear all allocated delayed IFUNC relocations in the namespace of
the link map. Deallocate all auxiliary allocations. This function
is intended for clearing up after a dlopen failure. */
void _dl_ifunc_clear_relocations (struct link_map *map)
attribute_hidden internal_function;
/* The no-op implementatoin is only available if IFUNCs are
supported. */
#ifdef HAVE_IFUNC
/* Delayed IFUNC relocation. For each link map with a referenced
IFUNC symbol, a separate single-linked list of delayed IFUNC
relocations exists while the dynamic linker is running. */
struct dl_ifunc_relocation
{
/* Information about the relocation. */
struct link_map *reloc_map;
const ElfW(Rela) *reloc;
ElfW(Addr) *reloc_addr;
/* Information about the IFUNC resolver. The corresponding symbol
map is implied. */
const ElfW(Sym) *ifunc_sym;
/* Pointer to the next element in the list of IFUNC relocations for
the symbol map. */
struct dl_ifunc_relocation *next;
};
/* Record a delayed IFUNC relocation for IFUNC_SYM at *RELOC_ADDR.
The relocation is associated with IFUNC_MAP. Can raise an error
using _dl_signal_error. IFUNC_SYM can be NULL if the relocation is
a relative IFUNC relocation. */
void _dl_ifunc_record_reloc (struct link_map *reloc_map,
const ElfW(Rela) *reloc,
ElfW(Addr) *reloc_addr,
struct link_map *ifunc_map,
const ElfW(Sym) *ifunc_sym)
attribute_hidden internal_function;
#else /* !HAVE_IFUNC */
/* Dummy implementations for targets without IFUNC support. */
static inline void
_dl_ifunc_apply_relocations (struct link_map *new)
{
}
static inline void
_dl_ifunc_clear_relocations (struct link_map *map)
{
}
#endif /* !HAVE_IFUNC */
#endif /* DL_IFUNC_H */
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