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      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
     67