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/* x86-64 feature tuning.
This file is part of the GNU C Library.
Copyright (C) 2018-2024 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _X86_64_FEATURE_CONTROL_H
#define _X86_64_FEATURE_CONTROL_H
/* For each CET feature, IBT and SHSTK, valid control values. */
enum dl_x86_cet_control
{
/* Enable CET features based on ELF property note. */
cet_elf_property = 0,
/* Always enable CET features. */
cet_always_on,
/* Always disable CET features. */
cet_always_off,
/* Enable CET features permissively. */
cet_permissive
};
/* PLT rewrite control. */
enum dl_plt_rewrite_control
{
/* No PLT rewrite. */
plt_rewrite_none,
/* Rewrite PLT with JMP at run-time. */
plt_rewrite_jmp,
/* Rewrite PLT with JMP and JMPABS at run-time. */
plt_rewrite_jmpabs
};
struct dl_x86_feature_control
{
enum dl_x86_cet_control ibt : 2;
enum dl_x86_cet_control shstk : 2;
enum dl_plt_rewrite_control plt_rewrite : 2;
};
#endif /* feature-control.h */
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