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/* ELF program property for Intel CET. Copyright (C) 2017-2022 Free Software Foundation, Inc. This file is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. This file is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ /* Add x86 feature with IBT and/or SHSTK bits to ELF program property if they are enabled. Otherwise, contents in this header file are unused. Define _CET_ENDBR for assembly codes. _CET_ENDBR should be placed unconditionally at the entrance of a function whose address may be taken. */ #ifndef _CET_H_INCLUDED #define _CET_H_INCLUDED #ifdef __ASSEMBLER__ # if defined __CET__ && (__CET__ & 1) != 0 # ifdef __x86_64__ # define _CET_ENDBR endbr64 # else # define _CET_ENDBR endbr32 # endif # else # define _CET_ENDBR # endif # ifdef __ELF__ # ifdef __CET__ # if (__CET__ & 1) != 0 /* GNU_PROPERTY_X86_FEATURE_1_IBT. */ # define __PROPERTY_IBT 0x1 # else # define __PROPERTY_IBT 0x0 # endif # if (__CET__ & 2) != 0 /* GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ # define __PROPERTY_SHSTK 0x2 # else # define __PROPERTY_SHSTK 0x0 # endif # define __PROPERTY_BITS (__PROPERTY_IBT | __PROPERTY_SHSTK) # ifdef __LP64__ # define __PROPERTY_ALIGN 3 # else # define __PROPERTY_ALIGN 2 # endif .pushsection ".note.gnu.property", "a" .p2align __PROPERTY_ALIGN .long 1f - 0f /* name length. */ .long 4f - 1f /* data length. */ /* NT_GNU_PROPERTY_TYPE_0. */ .long 5 /* note type. */ 0: .asciz "GNU" /* vendor name. */ 1: .p2align __PROPERTY_ALIGN /* GNU_PROPERTY_X86_FEATURE_1_AND. */ .long 0xc0000002 /* pr_type. */ .long 3f - 2f /* pr_datasz. */ 2: /* GNU_PROPERTY_X86_FEATURE_1_XXX. */ .long __PROPERTY_BITS 3: .p2align __PROPERTY_ALIGN 4: .popsection # endif /* __CET__ */ # endif /* __ELF__ */ #endif /* __ASSEMBLER__ */ #endif /* _CET_H_INCLUDED */