| /* 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 <drepper@redhat.com>, 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 |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 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 |
| (http://www.opensource.org/licenses/index.php) 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 |
| included package. Should you wish to participate in the Open Invention |
| Network licensing program, please visit www.openinventionnetwork.com |
| <http://www.openinventionnetwork.com>. */ |
| |
| #ifndef _ELF_KNOWLEDGE_H |
| #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) \ |
| & (SHF_WRITE | SHF_ALLOC | SHF_EXECINSTR | SHF_LINK_ORDER \ |
| | SHF_OS_NONCONFORMING | SHF_GROUP)) \ |
| | (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 |
| clear. |
| |
| 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 */ |
