| 1 | /* ELF program property for Intel CET.
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| 2 | Copyright (C) 2017-2021 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is free software; you can redistribute it and/or modify it
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| 5 | under the terms of the GNU General Public License as published by the
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| 6 | Free Software Foundation; either version 3, or (at your option) any
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| 7 | later version.
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| 8 |
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| 9 | This file is distributed in the hope that it will be useful, but
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| 10 | WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 12 | General Public License for more details.
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| 13 |
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| 14 | Under Section 7 of GPL version 3, you are granted additional
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| 15 | permissions described in the GCC Runtime Library Exception, version
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| 16 | 3.1, as published by the Free Software Foundation.
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| 17 |
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| 18 | You should have received a copy of the GNU General Public License and
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| 19 | a copy of the GCC Runtime Library Exception along with this program;
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| 20 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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| 21 | <http://www.gnu.org/licenses/>.
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| 22 | */
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| 23 |
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| 24 | /* Add x86 feature with IBT and/or SHSTK bits to ELF program property
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| 25 | if they are enabled. Otherwise, contents in this header file are
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| 26 | unused. Define _CET_ENDBR for assembly codes. _CET_ENDBR should be
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| 27 | placed unconditionally at the entrance of a function whose address
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| 28 | may be taken. */
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| 29 |
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| 30 | #ifndef _CET_H_INCLUDED
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| 31 | #define _CET_H_INCLUDED
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| 32 |
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| 33 | #ifdef __ASSEMBLER__
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| 34 |
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| 35 | # if defined __CET__ && (__CET__ & 1) != 0
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| 36 | # ifdef __x86_64__
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| 37 | # define _CET_ENDBR endbr64
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| 38 | # else
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| 39 | # define _CET_ENDBR endbr32
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| 40 | # endif
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| 41 | # else
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| 42 | # define _CET_ENDBR
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| 43 | # endif
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| 44 |
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| 45 | # ifdef __ELF__
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| 46 | # ifdef __CET__
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| 47 | # if (__CET__ & 1) != 0
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| 48 | /* GNU_PROPERTY_X86_FEATURE_1_IBT. */
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| 49 | # define __PROPERTY_IBT 0x1
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| 50 | # else
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| 51 | # define __PROPERTY_IBT 0x0
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| 52 | # endif
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| 53 |
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| 54 | # if (__CET__ & 2) != 0
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| 55 | /* GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
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| 56 | # define __PROPERTY_SHSTK 0x2
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| 57 | # else
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| 58 | # define __PROPERTY_SHSTK 0x0
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| 59 | # endif
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| 60 |
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| 61 | # define __PROPERTY_BITS (__PROPERTY_IBT | __PROPERTY_SHSTK)
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| 62 |
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| 63 | # ifdef __LP64__
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| 64 | # define __PROPERTY_ALIGN 3
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| 65 | # else
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| 66 | # define __PROPERTY_ALIGN 2
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| 67 | # endif
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| 68 |
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| 69 | .pushsection ".note.gnu.property", "a"
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| 70 | .p2align __PROPERTY_ALIGN
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| 71 | .long 1f - 0f /* name length. */
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| 72 | .long 4f - 1f /* data length. */
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| 73 | /* NT_GNU_PROPERTY_TYPE_0. */
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| 74 | .long 5 /* note type. */
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| 75 | 0:
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| 76 | .asciz "GNU" /* vendor name. */
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| 77 | 1:
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| 78 | .p2align __PROPERTY_ALIGN
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| 79 | /* GNU_PROPERTY_X86_FEATURE_1_AND. */
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| 80 | .long 0xc0000002 /* pr_type. */
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| 81 | .long 3f - 2f /* pr_datasz. */
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| 82 | 2:
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| 83 | /* GNU_PROPERTY_X86_FEATURE_1_XXX. */
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| 84 | .long __PROPERTY_BITS
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| 85 | 3:
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| 86 | .p2align __PROPERTY_ALIGN
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| 87 | 4:
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| 88 | .popsection
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| 89 | # endif /* __CET__ */
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| 90 | # endif /* __ELF__ */
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| 91 | #endif /* __ASSEMBLER__ */
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| 92 |
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| 93 | #endif /* _CET_H_INCLUDED */
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