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 */