mirror of
https://github.com/openharmony/third_party_elfutils.git
synced 2026-07-19 11:33:45 -04:00
Mark Wielaard
72e30c2e0c
GNU Build Attribute ELF Notes are generated by the GCC annobin plugin and described at https://fedoraproject.org/wiki/Toolchain/Watermark Unfortunately the constants aren't yet described in the standard glibc elf.h so they have been added to the elfutils specific elf-knowledge.h. The notes abuse the name owner field to encode some data not in the description. This makes it a bit hard to parse. We have to match the note owner name prefix (to "GA") to be sure the type is valid. We also cannot rely on the owner name being a valid C string since the attribute name and value can contain zero (terminators). So pass around namesz to the ebl note parsing functions. eu-elflint will recognize and eu-readelf -n will now show the notes: Note section [27] '.gnu.build.attributes' of 56080 bytes at offset 0x114564: Owner Data size Type GA 16 GNU Build Attribute OPEN Address Range: 0x2f30f - 0x2f30f VERSION: "3p8" GA 0 GNU Build Attribute OPEN TOOL: "gcc 8.2.1 20180801" GA 0 GNU Build Attribute OPEN "GOW": 45 GA 0 GNU Build Attribute OPEN STACK_PROT: 0 GA 0 GNU Build Attribute OPEN "stack_clash": TRUE GA 0 GNU Build Attribute OPEN "cf_protection": 0 GA 0 GNU Build Attribute OPEN "GLIBCXX_ASSERTIONS": TRUE GA 0 GNU Build Attribute OPEN "FORTIFY": 0 GA 0 GNU Build Attribute OPEN PIC: 3 GA 0 GNU Build Attribute OPEN SHORT_ENUM: FALSE GA 0 GNU Build Attribute OPEN ABI: c001100000012 GA 0 GNU Build Attribute OPEN "stack_realign": FALSE A new test was added to run-readelf -n for the existing annobin file. Signed-off-by: Mark Wielaard <mark@klomp.org>
102 lines
3.9 KiB
C
102 lines
3.9 KiB
C
/* Accumulation of various pieces of knowledge about ELF.
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Copyright (C) 2000-2012, 2014, 2016 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2000.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifndef _ELF_KNOWLEDGE_H
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#define _ELF_KNOWLEDGE_H 1
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#include <stdbool.h>
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/* Test whether a section can be stripped or not. */
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#define SECTION_STRIP_P(shdr, name, remove_comment) \
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/* Sections which are allocated are not removed. */ \
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(((shdr)->sh_flags & SHF_ALLOC) == 0 \
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/* We never remove .note sections. */ \
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&& (shdr)->sh_type != SHT_NOTE \
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&& (((shdr)->sh_type) != SHT_PROGBITS \
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/* Never remove .gnu.warning.* sections. */ \
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|| (name != NULL \
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&& strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) != 0\
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/* We remove .comment sections only if explicitly told to do so. */\
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&& (remove_comment \
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|| strcmp (name, ".comment") != 0))))
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/* Test whether `sh_info' field in section header contains a section
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index. There are two kinds of sections doing this:
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- the sections containing relocation information reference in this
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field the section to which the relocations apply;
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- section with the SHF_INFO_LINK flag set to signal that `sh_info'
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references a section. This allows correct handling of unknown
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sections. */
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#define SH_INFO_LINK_P(Shdr) \
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((Shdr)->sh_type == SHT_REL || (Shdr)->sh_type == SHT_RELA \
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|| ((Shdr)->sh_flags & SHF_INFO_LINK) != 0)
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/* Size of an entry in the hash table. The ELF specification says all
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entries are regardless of platform 32-bits in size. Early 64-bit
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ports (namely Alpha for Linux) got this wrong. The wording was not
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clear.
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Several years later the ABI for the 64-bit S390s was developed.
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Many things were copied from the IA-64 ABI (which uses the correct
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32-bit entry size) but what do these people do? They use 64-bit
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entries. It is really shocking to see what kind of morons are out
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there. And even worse: they are allowed to design ABIs. */
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#define SH_ENTSIZE_HASH(Ehdr) \
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((Ehdr)->e_machine == EM_ALPHA \
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|| ((Ehdr)->e_machine == EM_S390 \
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&& (Ehdr)->e_ident[EI_CLASS] == ELFCLASS64) ? 8 : 4)
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/* GNU Annobin notes are not fully standardized and abuses the owner name. */
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#define ELF_NOTE_GNU_BUILD_ATTRIBUTE_PREFIX "GA"
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#define NT_GNU_BUILD_ATTRIBUTE_OPEN 0x100
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#define NT_GNU_BUILD_ATTRIBUTE_FUNC 0x101
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#define GNU_BUILD_ATTRIBUTE_TYPE_NUMERIC '*'
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#define GNU_BUILD_ATTRIBUTE_TYPE_STRING '$'
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#define GNU_BUILD_ATTRIBUTE_TYPE_BOOL_TRUE '+'
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#define GNU_BUILD_ATTRIBUTE_TYPE_BOOL_FALSE '!'
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#define GNU_BUILD_ATTRIBUTE_VERSION 1
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#define GNU_BUILD_ATTRIBUTE_STACK_PROT 2
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#define GNU_BUILD_ATTRIBUTE_RELRO 3
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#define GNU_BUILD_ATTRIBUTE_STACK_SIZE 4
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#define GNU_BUILD_ATTRIBUTE_TOOL 5
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#define GNU_BUILD_ATTRIBUTE_ABI 6
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#define GNU_BUILD_ATTRIBUTE_PIC 7
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#define GNU_BUILD_ATTRIBUTE_SHORT_ENUM 8
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#endif /* elf-knowledge.h */
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