| Brian Silverman | 8649792 | 2018-02-10 19:28:39 -0500 | [diff] [blame^] | 1 | /* Accumulation of various pieces of knowledge about ELF. |
| 2 | Copyright (C) 2000-2012, 2014, 2016 Red Hat, Inc. |
| 3 | This file is part of elfutils. |
| 4 | Written by Ulrich Drepper <drepper@redhat.com>, 2000. |
| 5 | |
| 6 | This file is free software; you can redistribute it and/or modify |
| 7 | it under the terms of either |
| 8 | |
| 9 | * the GNU Lesser General Public License as published by the Free |
| 10 | Software Foundation; either version 3 of the License, or (at |
| 11 | your option) any later version |
| 12 | |
| 13 | or |
| 14 | |
| 15 | * the GNU General Public License as published by the Free |
| 16 | Software Foundation; either version 2 of the License, or (at |
| 17 | your option) any later version |
| 18 | |
| 19 | or both in parallel, as here. |
| 20 | |
| 21 | elfutils is distributed in the hope that it will be useful, but |
| 22 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 24 | General Public License for more details. |
| 25 | |
| 26 | You should have received copies of the GNU General Public License and |
| 27 | the GNU Lesser General Public License along with this program. If |
| 28 | not, see <http://www.gnu.org/licenses/>. */ |
| 29 | |
| 30 | #ifndef _ELF_KNOWLEDGE_H |
| 31 | #define _ELF_KNOWLEDGE_H 1 |
| 32 | |
| 33 | #include <stdbool.h> |
| 34 | |
| 35 | |
| 36 | /* Test whether a section can be stripped or not. */ |
| 37 | #define SECTION_STRIP_P(shdr, name, remove_comment) \ |
| 38 | /* Sections which are allocated are not removed. */ \ |
| 39 | (((shdr)->sh_flags & SHF_ALLOC) == 0 \ |
| 40 | /* We never remove .note sections. */ \ |
| 41 | && (shdr)->sh_type != SHT_NOTE \ |
| 42 | && (((shdr)->sh_type) != SHT_PROGBITS \ |
| 43 | /* Never remove .gnu.warning.* sections. */ \ |
| 44 | || (name != NULL \ |
| 45 | && strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) != 0\ |
| 46 | /* We remove .comment sections only if explicitly told to do so. */\ |
| 47 | && (remove_comment \ |
| 48 | || strcmp (name, ".comment") != 0)))) |
| 49 | |
| 50 | |
| 51 | /* Test whether `sh_info' field in section header contains a section |
| 52 | index. There are two kinds of sections doing this: |
| 53 | |
| 54 | - the sections containing relocation information reference in this |
| 55 | field the section to which the relocations apply; |
| 56 | |
| 57 | - section with the SHF_INFO_LINK flag set to signal that `sh_info' |
| 58 | references a section. This allows correct handling of unknown |
| 59 | sections. */ |
| 60 | #define SH_INFO_LINK_P(Shdr) \ |
| 61 | ((Shdr)->sh_type == SHT_REL || (Shdr)->sh_type == SHT_RELA \ |
| 62 | || ((Shdr)->sh_flags & SHF_INFO_LINK) != 0) |
| 63 | |
| 64 | |
| 65 | /* Size of an entry in the hash table. The ELF specification says all |
| 66 | entries are regardless of platform 32-bits in size. Early 64-bit |
| 67 | ports (namely Alpha for Linux) got this wrong. The wording was not |
| 68 | clear. |
| 69 | |
| 70 | Several years later the ABI for the 64-bit S390s was developed. |
| 71 | Many things were copied from the IA-64 ABI (which uses the correct |
| 72 | 32-bit entry size) but what do these people do? They use 64-bit |
| 73 | entries. It is really shocking to see what kind of morons are out |
| 74 | there. And even worse: they are allowed to design ABIs. */ |
| 75 | #define SH_ENTSIZE_HASH(Ehdr) \ |
| 76 | ((Ehdr)->e_machine == EM_ALPHA \ |
| 77 | || ((Ehdr)->e_machine == EM_S390 \ |
| 78 | && (Ehdr)->e_ident[EI_CLASS] == ELFCLASS64) ? 8 : 4) |
| 79 | |
| 80 | #endif /* elf-knowledge.h */ |