path: root/sysdeps/generic/ldsodefs.h

/* Run-time dynamic linker data structures for loaded ELF shared objects.
   Copyright (C) 1995-2002, 2003 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, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef	_LDSODEFS_H
#define	_LDSODEFS_H	1

#include <features.h>

#include <stdbool.h>
#define __need_size_t
#define __need_NULL
#include <stddef.h>
#include <string.h>

#include <elf.h>
#include <dlfcn.h>
#include <fpu_control.h>
#include <sys/mman.h>
#include <link.h>
#include <dl-lookupcfg.h>
#include <dl-sysdep.h>
#include <bits/libc-lock.h>
#include <hp-timing.h>
#include <tls.h>

__BEGIN_DECLS

/* We use this macro to refer to ELF types independent of the native wordsize.
   `ElfW(TYPE)' is used in place of `Elf32_TYPE' or `Elf64_TYPE'.  */
#define ELFW(type)	_ElfW (ELF, __ELF_NATIVE_CLASS, type)

/* All references to the value of l_info[DT_PLTGOT],
  l_info[DT_STRTAB], l_info[DT_SYMTAB], l_info[DT_RELA],
  l_info[DT_REL], l_info[DT_JMPREL], and l_info[VERSYMIDX (DT_VERSYM)]
  have to be accessed via the D_PTR macro.  The macro is needed since for
  most architectures the entry is already relocated - but for some not
  and we need to relocate at access time.  */
#ifdef DL_RO_DYN_SECTION
# define D_PTR(map,i) (map->i->d_un.d_ptr + map->l_addr)
#else
# define D_PTR(map,i) map->i->d_un.d_ptr
#endif

/* On some platforms more information than just the address of the symbol
   is needed from the lookup functions.  In this case we return the whole
   link map.  */
#ifdef DL_LOOKUP_RETURNS_MAP
typedef struct link_map *lookup_t;
# define LOOKUP_VALUE(map) map
# define LOOKUP_VALUE_ADDRESS(map) (map ? map->l_addr : 0)
#else
typedef ElfW(Addr) lookup_t;
# define LOOKUP_VALUE(map) map->l_addr
# define LOOKUP_VALUE_ADDRESS(address) address
#endif

/* on some architectures a pointer to a function is not just a pointer
   to the actual code of the function but rather an architecture
   specific descriptor. */
#ifndef ELF_FUNCTION_PTR_IS_SPECIAL
# define DL_SYMBOL_ADDRESS(map, ref) \
 (void *) (LOOKUP_VALUE_ADDRESS (map) + ref->st_value)
# define DL_LOOKUP_ADDRESS(addr) ((ElfW(Addr)) (addr))
# define DL_DT_INIT_ADDRESS(map, start) (start)
# define DL_DT_FINI_ADDRESS(map, start) (start)
#endif

/* Unmap a loaded object, called by _dl_close (). */
#ifndef DL_UNMAP_IS_SPECIAL
# define DL_UNMAP(map) \
 __munmap ((void *) (map)->l_map_start,					      \
	   (map)->l_map_end - (map)->l_map_start)
#endif

/* By default we do not need special support to initialize DSOs loaded
   by statically linked binaries.  */
#ifndef DL_STATIC_INIT
# define DL_STATIC_INIT(map)
#endif

/* Reloc type classes as returned by elf_machine_type_class().
   ELF_RTYPE_CLASS_PLT means this reloc should not be satisfied by
   some PLT symbol, ELF_RTYPE_CLASS_COPY means this reloc should not be
   satisfied by any symbol in the executable.  Some architectures do
   not support copy relocations.  In this case we define the macro to
   zero so that the code for handling them gets automatically optimized
   out.  */
#define ELF_RTYPE_CLASS_PLT 1
#ifndef DL_NO_COPY_RELOCS
# define ELF_RTYPE_CLASS_COPY 2
#else
# define ELF_RTYPE_CLASS_COPY 0
#endif

/* ELF uses the PF_x macros to specify the segment permissions, mmap
   uses PROT_xxx.  In most cases the three macros have the values 1, 2,
   and 3 but not in a matching order.  The following macros allows
   converting from the PF_x values to PROT_xxx values.  */
#define PF_TO_PROT \
  ((PROT_READ << (PF_R * 4))						      \
   | (PROT_WRITE << (PF_W * 4))						      \
   | (PROT_EXEC << (PF_X * 4))						      \
   | ((PROT_READ | PROT_WRITE) << ((PF_R | PF_W) * 4))			      \
   | ((PROT_READ | PROT_EXEC) << ((PF_R | PF_X) * 4))			      \
   | ((PROT_WRITE | PROT_EXEC) << (PF_W | PF_X) * 4)			      \
   | ((PROT_READ | PROT_WRITE | PROT_EXEC) << ((PF_R | PF_W | PF_X) * 4)))


/* For the version handling we need an array with only names and their
   hash values.  */
struct r_found_version
  {
    const char *name;
    ElfW(Word) hash;

    int hidden;
    const char *