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/* Accumulation of various pieces of knowledge about ELF.
Copyright (C) 2000, 2001, 2002, 2003, 2005 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <>, 2000.
Red Hat elfutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by the
Free Software Foundation; version 2 of the License.
Red Hat elfutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
General Public License for more details.
You should have received a copy of the GNU General Public License along
with Red Hat elfutils; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
In addition, as a special exception, Red Hat, Inc. gives You the
additional right to link the code of Red Hat elfutils with code licensed
under any Open Source Initiative certified open source license
( which requires the
distribution of source code with any binary distribution and to
distribute linked combinations of the two. Non-GPL Code permitted under
this exception must only link to the code of Red Hat elfutils through
those well defined interfaces identified in the file named EXCEPTION
found in the source code files (the "Approved Interfaces"). The files
of Non-GPL Code may instantiate templates or use macros or inline
functions from the Approved Interfaces without causing the resulting
work to be covered by the GNU General Public License. Only Red Hat,
Inc. may make changes or additions to the list of Approved Interfaces.
Red Hat's grant of this exception is conditioned upon your not adding
any new exceptions. If you wish to add a new Approved Interface or
exception, please contact Red Hat. You must obey the GNU General Public
License in all respects for all of the Red Hat elfutils code and other
code used in conjunction with Red Hat elfutils except the Non-GPL Code
covered by this exception. If you modify this file, you may extend this
exception to your version of the file, but you are not obligated to do
so. If you do not wish to provide this exception without modification,
you must delete this exception statement from your version and license
this file solely under the GPL without exception.
Red Hat elfutils is an included package of the Open Invention Network.
An included package of the Open Invention Network is a package for which
Open Invention Network licensees cross-license their patents. No patent
license is granted, either expressly or impliedly, by designation as an
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<>. */
#define _ELF_KNOWLEDGE_H 1
#include <stdbool.h>
/* Test whether a section can be stripped or not. */
#define SECTION_STRIP_P(shdr, name, remove_comment) \
/* Sections which are allocated are not removed. */ \
(((shdr)->sh_flags & SHF_ALLOC) == 0 \
/* We never remove .note sections. */ \
&& (shdr)->sh_type != SHT_NOTE \
&& (((shdr)->sh_type) != SHT_PROGBITS \
/* Never remove .gnu.warning.* sections. */ \
|| (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) != 0 \
/* We remove .comment sections only if explicitly told to do so. */\
&& (remove_comment \
|| strcmp (name, ".comment") != 0))) \
/* So far we do not remove any of the non-standard sections. \
XXX Maybe in future. */ \
&& (shdr)->sh_type < SHT_NUM)
/* Test whether `sh_info' field in section header contains a section
index. There are two kinds of sections doing this:
- the sections containing relocation information reference in this
field the section to which the relocations apply;
- section with the SHF_INFO_LINK flag set to signal that `sh_info'
references a section. This allows correct handling of unknown
sections. */
#define SH_INFO_LINK_P(Shdr) \
((Shdr)->sh_type == SHT_REL || (Shdr)->sh_type == SHT_RELA \
|| ((Shdr)->sh_flags & SHF_INFO_LINK) != 0)
/* When combining ELF section flags we must distinguish two kinds:
- flags which cause problem if not added to the result even if not
present in all input sections
- flags which cause problem if added to the result if not present
in all input sections
The following definition is for the general case. There might be
machine specific extensions. */
#define SH_FLAGS_COMBINE(Flags1, Flags2) \
(((Flags1 | Flags2) \
| (Flags1 & Flags2 & (SHF_MERGE | SHF_STRINGS | SHF_INFO_LINK)))
/* Similar macro: return the bits of the flags which necessarily must
match if two sections are automatically combined. Sections still
can be forcefully combined in which case SH_FLAGS_COMBINE can be
used to determine the combined flags. */
#define SH_FLAGS_IMPORTANT(Flags) \
((Flags) & ~((GElf_Xword) 0 | SHF_LINK_ORDER | SHF_OS_NONCONFORMING))
/* Size of an entry in the hash table. The ELF specification says all
entries are regardless of platform 32-bits in size. Early 64-bit
ports (namely Alpha for Linux) got this wrong. The wording was not
Several years later the ABI for the 64-bit S390s was developed.
Many things were copied from the IA-64 ABI (which uses the correct
32-bit entry size) but what do these people do? They use 64-bit
entries. It is really shocking to see what kind of morons are out
there. And even worse: they are allowed to design ABIs. */
#define SH_ENTSIZE_HASH(Ehdr) \
((Ehdr)->e_machine == EM_ALPHA \
|| ((Ehdr)->e_machine == EM_S390 \
&& (Ehdr)->e_ident[EI_CLASS] == ELFCLASS64) ? 8 : 4)
#endif /* elf-knowledge.h */