1 /* 2 * Copyright (C) 2012 ARM Ltd. 3 * Copyright (C) 2017 SiFive, Inc. 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program. If not, see <http://www.gnu.org/licenses/>. 16 * 17 * This file was copied from arch/arm64/include/uapi/asm/ucontext.h 18 */ 19 #ifndef _UAPI__ASM_UCONTEXT_H 20 #define _UAPI__ASM_UCONTEXT_H 21 22 #include <linux/types.h> 23 24 struct ucontext { 25 unsigned long uc_flags; 26 struct ucontext *uc_link; 27 stack_t uc_stack; 28 sigset_t uc_sigmask; 29 /* There's some padding here to allow sigset_t to be expanded in the 30 * future. Though this is unlikely, other architectures put uc_sigmask 31 * at the end of this structure and explicitly state it can be 32 * expanded, so we didn't want to box ourselves in here. */ 33 __u8 __unused[1024 / 8 - sizeof(sigset_t)]; 34 /* We can't put uc_sigmask at the end of this structure because we need 35 * to be able to expand sigcontext in the future. For example, the 36 * vector ISA extension will almost certainly add ISA state. We want 37 * to ensure all user-visible ISA state can be saved and restored via a 38 * ucontext, so we're putting this at the end in order to allow for 39 * infinite extensibility. Since we know this will be extended and we 40 * assume sigset_t won't be extended an extreme amount, we're 41 * prioritizing this. */ 42 struct sigcontext uc_mcontext; 43 }; 44 45 #endif /* _UAPI__ASM_UCONTEXT_H */ 46