#pragma once /* Assembler macros for x86. Copyright (C) 2017-2020 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ #ifndef _X86_SYSDEP_H #define _X86_SYSDEP_H 1 #include "sysdep_generic.h" /* __CET__ is defined by GCC with Control-Flow Protection values: enum cf_protection_level { CF_NONE = 0, CF_BRANCH = 1 << 0, CF_RETURN = 1 << 1, CF_FULL = CF_BRANCH | CF_RETURN, CF_SET = 1 << 2 }; */ /* Set if CF_BRANCH (IBT) is enabled. */ #define X86_FEATURE_1_IBT (1U << 0) /* Set if CF_RETURN (SHSTK) is enabled. */ #define X86_FEATURE_1_SHSTK (1U << 1) #ifdef __CET__ # define CET_ENABLED 1 # define IBT_ENABLED (__CET__ & X86_FEATURE_1_IBT) # define SHSTK_ENABLED (__CET__ & X86_FEATURE_1_SHSTK) #else # define CET_ENABLED 0 # define IBT_ENABLED 0 # define SHSTK_ENABLED 0 #endif /* Offset for fxsave/xsave area used by _dl_runtime_resolve. Also need space to preserve RCX, RDX, RSI, RDI, R8, R9 and RAX. It must be aligned to 16 bytes for fxsave and 64 bytes for xsave. */ #define STATE_SAVE_OFFSET (8 * 7 + 8) /* Save SSE, AVX, AVX512, mask and bound registers. */ #define STATE_SAVE_MASK \ ((1 << 1) | (1 << 2) | (1 << 3) | (1 << 5) | (1 << 6) | (1 << 7)) #ifdef __ASSEMBLER__ /* Syntactic details of assembler. */ #ifdef _CET_ENDBR # define _CET_NOTRACK notrack #else # define _CET_ENDBR # define _CET_NOTRACK #endif /* ELF uses byte-counts for .align, most others use log2 of count of bytes. */ #define ALIGNARG(log2) 1<<log2 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name; /* Define an entry point visible from C. */ #define ENTRY(name) \ .globl C_SYMBOL_NAME(name); \ .type C_SYMBOL_NAME(name),@function; \ .align ALIGNARG(4); \ C_LABEL(name) \ cfi_startproc; \ _CET_ENDBR; \ CALL_MCOUNT #undef END #define END(name) \ cfi_endproc; \ ASM_SIZE_DIRECTIVE(name) #define ENTRY_CHK(name) ENTRY (name) #define END_CHK(name) END (name) /* Since C identifiers are not normally prefixed with an underscore on this system, the asm identifier `syscall_error' intrudes on the C name space. Make sure we use an innocuous name. */ #define syscall_error __syscall_error #define mcount _mcount #undef PSEUDO_END #define PSEUDO_END(name) \ END (name) /* Local label name for asm code. */ #ifndef L /* ELF-like local names start with `.L'. */ # define L(name) .L##name #endif #define atom_text_section .section ".text.atom", "ax" #endif /* __ASSEMBLER__ */ #endif /* _X86_SYSDEP_H */