cet.h

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/*===------ cet.h -Control-flow Enforcement Technology  feature ------------===
 * Add x86 feature with IBT and/or SHSTK bits to ELF program property if they
 * are enabled. Otherwise, contents in this header file are unused. This file
 * is mainly design for assembly source code which want to enable CET.
 *
 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 * See https://llvm.org/LICENSE.txt for license information.
 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 *
 *===-----------------------------------------------------------------------===
 */
#ifndef __CET_H
#define __CET_H
 
#ifdef __ASSEMBLER__
 
#ifndef __CET__
# define _CET_ENDBR
#endif
 
#ifdef __CET__
 
# ifdef __LP64__
#  if __CET__ & 0x1
#    define _CET_ENDBR endbr64
#  else
#    define _CET_ENDBR
#  endif
# else
#  if __CET__ & 0x1
#    define _CET_ENDBR endbr32
#  else
#    define _CET_ENDBR
#  endif
# endif
 
 
#  ifdef __LP64__
#   define __PROPERTY_ALIGN 3
#  else
#   define __PROPERTY_ALIGN 2
#  endif
 
        .pushsection ".note.gnu.property", "a"
        .p2align __PROPERTY_ALIGN
        .long 1f - 0f           /* name length.  */
        .long 4f - 1f           /* data length.  */
        /* NT_GNU_PROPERTY_TYPE_0.   */
        .long 5                 /* note type.  */
0:
        .asciz "GNU"            /* vendor name.  */
1:
        .p2align __PROPERTY_ALIGN
        /* GNU_PROPERTY_X86_FEATURE_1_AND.  */
        .long 0xc0000002        /* pr_type.  */
        .long 3f - 2f           /* pr_datasz.  */
2:
        /* GNU_PROPERTY_X86_FEATURE_1_XXX.  */
        .long __CET__
3:
        .p2align __PROPERTY_ALIGN
4:
        .popsection
#endif
#endif
#endif