1 files changed, 53 insertions, 0 deletions
diff --git a/sysdeps/x86_64/feature-control.h b/sysdeps/x86_64/feature-control.h
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+++ b/sysdeps/x86_64/feature-control.h
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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 */