1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef __LOONGARCH_UAPI_ASM_UCONTEXT_H
3#define __LOONGARCH_UAPI_ASM_UCONTEXT_H
4
5/**
6 * struct ucontext - user context structure
7 * @uc_flags:
8 * @uc_link:
9 * @uc_stack:
10 * @uc_mcontext:	holds basic processor state
11 * @uc_sigmask:
12 * @uc_extcontext:	holds extended processor state
13 */
14struct ucontext {
15	unsigned long		uc_flags;
16	struct ucontext		*uc_link;
17	stack_t			uc_stack;
18	sigset_t		uc_sigmask;
19	/* There's some padding here to allow sigset_t to be expanded in the
20	 * future.  Though this is unlikely, other architectures put uc_sigmask
21	 * at the end of this structure and explicitly state it can be
22	 * expanded, so we didn't want to box ourselves in here. */
23	__u8		  __unused[1024 / 8 - sizeof(sigset_t)];
24	/* We can't put uc_sigmask at the end of this structure because we need
25	 * to be able to expand sigcontext in the future.  For example, the
26	 * vector ISA extension will almost certainly add ISA state.  We want
27	 * to ensure all user-visible ISA state can be saved and restored via a
28	 * ucontext, so we're putting this at the end in order to allow for
29	 * infinite extensibility.  Since we know this will be extended and we
30	 * assume sigset_t won't be extended an extreme amount, we're
31	 * prioritizing this. */
32	struct sigcontext	uc_mcontext;
33};
34
35#endif /* __LOONGARCH_UAPI_ASM_UCONTEXT_H */
36