xref: /kernel/linux/linux-6.6/arch/loongarch/include/uapi/asm/ucontext.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __LOONGARCH_UAPI_ASM_UCONTEXT_H
#define __LOONGARCH_UAPI_ASM_UCONTEXT_H

/**
 * struct ucontext - user context structure
 * @uc_flags:
 * @uc_link:
 * @uc_stack:
 * @uc_mcontext:	holds basic processor state
 * @uc_sigmask:
 * @uc_extcontext:	holds extended processor state
 */
struct ucontext {
	unsigned long		uc_flags;
	struct ucontext		*uc_link;
	stack_t			uc_stack;
	sigset_t		uc_sigmask;
	/* There's some padding here to allow sigset_t to be expanded in the
	 * future.  Though this is unlikely, other architectures put uc_sigmask
	 * at the end of this structure and explicitly state it can be
	 * expanded, so we didn't want to box ourselves in here. */
	__u8		  __unused[1024 / 8 - sizeof(sigset_t)];
	/* We can't put uc_sigmask at the end of this structure because we need
	 * to be able to expand sigcontext in the future.  For example, the
	 * vector ISA extension will almost certainly add ISA state.  We want
	 * to ensure all user-visible ISA state can be saved and restored via a
	 * ucontext, so we're putting this at the end in order to allow for
	 * infinite extensibility.  Since we know this will be extended and we
	 * assume sigset_t won't be extended an extreme amount, we're
	 * prioritizing this. */
	struct sigcontext	uc_mcontext;
};

#endif /* __LOONGARCH_UAPI_ASM_UCONTEXT_H */