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173
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1 /*===------ cet.h -Control-flow Enforcement Technology feature ------------===
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2 * Add x86 feature with IBT and/or SHSTK bits to ELF program property if they
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3 * are enabled. Otherwise, contents in this header file are unused. This file
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4 * is mainly design for assembly source code which want to enable CET.
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5 *
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6 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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7 * See https://llvm.org/LICENSE.txt for license information.
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8 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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9 *
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10 *===-----------------------------------------------------------------------===
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11 */
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12 #ifndef __CET_H
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13 #define __CET_H
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14
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15 #ifdef __ASSEMBLER__
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16
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17 #ifndef __CET__
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18 # define _CET_ENDBR
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19 #endif
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20
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21 #ifdef __CET__
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22
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23 # ifdef __LP64__
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24 # if __CET__ & 0x1
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25 # define _CET_ENDBR endbr64
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26 # else
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27 # define _CET_ENDBR
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28 # endif
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29 # else
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30 # if __CET__ & 0x1
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31 # define _CET_ENDBR endbr32
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32 # else
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33 # define _CET_ENDBR
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34 # endif
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35 # endif
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36
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37
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38 # ifdef __LP64__
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39 # define __PROPERTY_ALIGN 3
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40 # else
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41 # define __PROPERTY_ALIGN 2
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42 # endif
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43
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44 .pushsection ".note.gnu.property", "a"
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45 .p2align __PROPERTY_ALIGN
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46 .long 1f - 0f /* name length. */
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47 .long 4f - 1f /* data length. */
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48 /* NT_GNU_PROPERTY_TYPE_0. */
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49 .long 5 /* note type. */
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50 0:
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51 .asciz "GNU" /* vendor name. */
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52 1:
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53 .p2align __PROPERTY_ALIGN
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54 /* GNU_PROPERTY_X86_FEATURE_1_AND. */
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55 .long 0xc0000002 /* pr_type. */
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56 .long 3f - 2f /* pr_datasz. */
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57 2:
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58 /* GNU_PROPERTY_X86_FEATURE_1_XXX. */
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59 .long __CET__
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60 3:
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61 .p2align __PROPERTY_ALIGN
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62 4:
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63 .popsection
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64 #endif
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65 #endif
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66 #endif
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