include/asm-x86/ucontext_64.h

#ifndef _ASMX8664_UCONTEXT_H
#define _ASMX8664_UCONTEXT_H

struct ucontext {
	unsigned long	  uc_flags;
	struct ucontext  *uc_link;
	stack_t		  uc_stack;
	struct sigcontext uc_mcontext;
	sigset_t	  uc_sigmask;	/* mask last for extensibility */
};

#endif