/* 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 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 . */ #ifndef _ELF_KNOWLEDGE_H #define _ELF_KNOWLEDGE_H 1 #include /* 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 */