typedef struct mcontext mcontext_t;
typedef struct ucontext ucontext_t;

extern	int		swapcontext(ucontext_t*, const ucontext_t*);
extern	void	makecontext(ucontext_t*, void(*)(), int, ...);

/*
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)ucontext.h	8.1 (Berkeley) 6/10/93
 *	JNPR: ucontext.h,v 1.2 2007/08/09 11:23:32 katta
 * $FreeBSD: src/sys/mips/include/ucontext.h,v 1.2 2010/01/10 19:50:24 imp Exp $
 */

struct	mcontext {
	/*
	 * These fields must match the corresponding fields in struct 
	 * sigcontext which follow 'sc_mask'. That way we can support
	 * struct sigcontext and ucontext_t at the same time.
	 */
	int		mc_onstack;		/* sigstack state to restore */
	int		mc_pc;			/* pc at time of signal */
	int		mc_regs[32];	/* processor regs 0 to 31 */
    int		sr;             /* status register */
    int		mullo, mulhi;	/* mullo and mulhi registers... */
	int		mc_fpused;		/* fp has been used */
	int		mc_fpregs[33];	/* fp regs 0 to 31 and csr */
	int		mc_fpc_eir;		/* fp exception instruction reg */
	void	*mc_tls;		/* pointer to TLS area */
	int	__spare__[8];		/* XXX reserved */ 
};

struct ucontext {
	/*
	 * Keep the order of the first two fields. Also,
	 * keep them the first two fields in the structure.
	 * This way we can have a union with struct
	 * sigcontext and ucontext_t. This allows us to
	 * support them both at the same time.
	 * note: the union is not defined, though.
	 */
	sigset_t	uc_sigmask;
	mcontext_t	uc_mcontext;

	struct __ucontext *uc_link;
	stack_t		uc_stack;
	int		uc_flags;
	int		__spare__[4];
};