1 /* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */ 2 /* 3 * Copyright (C) 2012 ARM Ltd. 4 * Copyright (C) 2017 SiFive, Inc. 5 * 6 * This file was copied from arch/arm64/include/uapi/asm/ucontext.h 7 */ 8 #ifndef _UAPI__ASM_UCONTEXT_H 9 #define _UAPI__ASM_UCONTEXT_H 10 11 #include <linux/types.h> 12 13 struct ucontext { 14 unsigned long uc_flags; 15 struct ucontext *uc_link; 16 stack_t uc_stack; 17 sigset_t uc_sigmask; 18 /* There's some padding here to allow sigset_t to be expanded in the 19 * future. Though this is unlikely, other architectures put uc_sigmask 20 * at the end of this structure and explicitly state it can be 21 * expanded, so we didn't want to box ourselves in here. */ 22 __u8 __unused[1024 / 8 - sizeof(sigset_t)]; 23 /* We can't put uc_sigmask at the end of this structure because we need 24 * to be able to expand sigcontext in the future. For example, the 25 * vector ISA extension will almost certainly add ISA state. We want 26 * to ensure all user-visible ISA state can be saved and restored via a 27 * ucontext, so we're putting this at the end in order to allow for 28 * infinite extensibility. Since we know this will be extended and we 29 * assume sigset_t won't be extended an extreme amount, we're 30 * prioritizing this. */ 31 struct sigcontext uc_mcontext; 32 }; 33 34 #endif /* _UAPI__ASM_UCONTEXT_H */ 35