clang/lib/Headers/cet.h

   1 /*===------ cet.h -Control-flow Enforcement Technology  feature ------------===
   2  * Add x86 feature with IBT and/or SHSTK bits to ELF program property if they
   3  * are enabled. Otherwise, contents in this header file are unused. This file
   4  * is mainly design for assembly source code which want to enable CET.
   5  *
   6  * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   7  * See https://llvm.org/LICENSE.txt for license information.
   8  * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   9  *
  10  *===-----------------------------------------------------------------------===
  11  */
  12 #ifndef __CET_H
  13 #define __CET_H
  14
  15 #ifdef __ASSEMBLER__
  16
  17 #ifndef __CET__
  18 # define _CET_ENDBR
  19 #endif
  20
  21 #ifdef __CET__
  22
  23 # ifdef __LP64__
  24 #  if __CET__ & 0x1
  25 #    define _CET_ENDBR endbr64
  26 #  else
  27 #    define _CET_ENDBR
  28 #  endif
  29 # else
  30 #  if __CET__ & 0x1
  31 #    define _CET_ENDBR endbr32
  32 #  else
  33 #    define _CET_ENDBR
  34 #  endif
  35 # endif
  36
  37
  38 #  ifdef __LP64__
  39 #   define __PROPERTY_ALIGN 3
  40 #  else
  41 #   define __PROPERTY_ALIGN 2
  42 #  endif
  43
  44         .pushsection ".note.gnu.property", "a"
  45         .p2align __PROPERTY_ALIGN
  46         .long 1f - 0f           /* name length.  */
  47         .long 4f - 1f           /* data length.  */
  48         /* NT_GNU_PROPERTY_TYPE_0.   */
  49         .long 5                 /* note type.  */
  50 0:
  51         .asciz "GNU"            /* vendor name.  */
  52 1:
  53         .p2align __PROPERTY_ALIGN
  54         /* GNU_PROPERTY_X86_FEATURE_1_AND.  */
  55         .long 0xc0000002        /* pr_type.  */
  56         .long 3f - 2f           /* pr_datasz.  */
  57 2:
  58         /* GNU_PROPERTY_X86_FEATURE_1_XXX.  */
  59         .long __CET__
  60 3:
  61         .p2align __PROPERTY_ALIGN
  62 4:
  63         .popsection
  64 #endif
  65 #endif
  66 #endif