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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 |
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