Sasha Smundak | 0fc590b | 2020-10-07 08:11:59 -0700 | [diff] [blame] | 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 |