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/* ELF program property for Intel CET. |
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Copyright (C) 2017-2021 Free Software Foundation, Inc. |
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|
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This file is free software; you can redistribute it and/or modify it |
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under the terms of the GNU General Public License as published by the |
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Free Software Foundation; either version 3, or (at your option) any |
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later version. |
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|
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This file is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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|
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Under Section 7 of GPL version 3, you are granted additional |
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permissions described in the GCC Runtime Library Exception, version |
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3.1, as published by the Free Software Foundation. |
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|
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You should have received a copy of the GNU General Public License and |
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a copy of the GCC Runtime Library Exception along with this program; |
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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<http://www.gnu.org/licenses/>. |
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*/ |
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|
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/* Add x86 feature with IBT and/or SHSTK bits to ELF program property |
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if they are enabled. Otherwise, contents in this header file are |
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unused. Define _CET_ENDBR for assembly codes. _CET_ENDBR should be |
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placed unconditionally at the entrance of a function whose address |
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may be taken. */ |
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|
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#ifndef _CET_H_INCLUDED |
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#define _CET_H_INCLUDED |
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|
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#ifdef __ASSEMBLER__ |
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|
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# if defined __CET__ && (__CET__ & 1) != 0 |
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# ifdef __x86_64__ |
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# define _CET_ENDBR endbr64 |
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# else |
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# define _CET_ENDBR endbr32 |
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# endif |
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# else |
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# define _CET_ENDBR |
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# endif |
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|
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# ifdef __ELF__ |
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# ifdef __CET__ |
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# if (__CET__ & 1) != 0 |
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/* GNU_PROPERTY_X86_FEATURE_1_IBT. */ |
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# define __PROPERTY_IBT 0x1 |
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# else |
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# define __PROPERTY_IBT 0x0 |
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# endif |
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|
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# if (__CET__ & 2) != 0 |
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/* GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ |
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# define __PROPERTY_SHSTK 0x2 |
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# else |
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# define __PROPERTY_SHSTK 0x0 |
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# endif |
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|
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# define __PROPERTY_BITS (__PROPERTY_IBT | __PROPERTY_SHSTK) |
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|
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# ifdef __LP64__ |
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# define __PROPERTY_ALIGN 3 |
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# else |
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# define __PROPERTY_ALIGN 2 |
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# endif |
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|
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.pushsection ".note.gnu.property", "a" |
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.p2align __PROPERTY_ALIGN |
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.long 1f - 0f /* name length. */ |
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.long 4f - 1f /* data length. */ |
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/* NT_GNU_PROPERTY_TYPE_0. */ |
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.long 5 /* note type. */ |
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0: |
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.asciz "GNU" /* vendor name. */ |
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1: |
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.p2align __PROPERTY_ALIGN |
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/* GNU_PROPERTY_X86_FEATURE_1_AND. */ |
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.long 0xc0000002 /* pr_type. */ |
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.long 3f - 2f /* pr_datasz. */ |
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2: |
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/* GNU_PROPERTY_X86_FEATURE_1_XXX. */ |
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.long __PROPERTY_BITS |
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3: |
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.p2align __PROPERTY_ALIGN |
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4: |
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.popsection |
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# endif /* __CET__ */ |
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# endif /* __ELF__ */ |
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#endif /* __ASSEMBLER__ */ |
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|
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#endif /* _CET_H_INCLUDED */ |
