xref: /src/sys/arch/i386/include/mcontext.h

/*	$NetBSD: mcontext.h,v 1.4 2003/08/25 13:11:30 tron Exp $	*/

/*-
 * Copyright (c) 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Klaus Klein.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#ifndef _I386_MCONTEXT_H_
#define _I386_MCONTEXT_H_

/*
 * Layout of mcontext_t according to the System V Application Binary Interface,
 * Intel386(tm) Architecture Processor Supplement, Fourth Edition.
 */

/*
 * General register state
 */
#define _NGREG		19
typedef	int		__greg_t;
typedef	__greg_t	__gregset_t[_NGREG];

#define _REG_GS		0
#define _REG_FS		1
#define _REG_ES		2
#define _REG_DS		3
#define _REG_EDI	4
#define _REG_ESI	5
#define _REG_EBP	6
#define _REG_ESP	7
#define _REG_EBX	8
#define _REG_EDX	9
#define _REG_ECX	10
#define _REG_EAX	11
#define _REG_TRAPNO	12
#define _REG_ERR	13
#define _REG_EIP	14
#define _REG_CS		15
#define _REG_EFL	16
#define _REG_UESP	17
#define _REG_SS		18

/*
 * Floating point register state
 */
typedef struct {
	union {
		struct {
			int	__fp_state[27];	/* Environment and registers */
			int	__fp_status;	/* Software status word */
		} __fpchip_state;
		struct {
			char	__fp_emul[246];
			char	__fp_epad[2];
		} __fp_emul_space;
		struct {
			char	__fp_xmm[512];
		} __fp_xmm_state;
		int	__fp_fpregs[128];
	} __fp_reg_set;
	long	__fp_wregs[33];			/* Weitek? */
} __fpregset_t;

typedef struct {
	__gregset_t	__gregs;
	__fpregset_t	__fpregs;
} mcontext_t;

#define _UC_FXSAVE	0x20	/* FP state is in FXSAVE format in XMM space */

#define _UC_MACHINE_PAD	5	/* Padding appended to ucontext_t */

#define _UC_UCONTEXT_ALIGN	(~0xf)

#ifdef _KERNEL_OPT
#include "opt_vm86.h"
#ifdef VM86
/*#include <machine/psl.h>*/
#define PSL_VM 0x00020000
#define _UC_MACHINE_SP(uc) ((uc)->uc_mcontext.__gregs[_REG_UESP] + \
	((uc)->uc_mcontext.__gregs[_REG_EFL] & PSL_VM ? \
	 ((uc)->uc_mcontext.__gregs[_REG_SS] << 4) : 0))
#else
#define _UC_MACHINE_SP(uc)	((uc)->uc_mcontext.__gregs[_REG_UESP])
#endif
#endif

#endif	/* !_I386_MCONTEXT_H_ */