NetBSD/sys/arch/mips/include/mcontext.h

/*	$NetBSD: mcontext.h,v 1.6 2004/07/03 05:06:37 simonb Exp $	*/

/*-
 * Copyright (c) 1999, 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Klaus Klein, and by Jason R. Thorpe of Wasabi Systems, Inc.
 *
 * 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 _MIPS_MCONTEXT_H_
#define _MIPS_MCONTEXT_H_

/*
 * General register state
 */
#define _NGREG		37	/* R0-R31, MDLO, MDHI, CAUSE, PC, SR */

#define _REG_R0		0
#define _REG_AT		1
#define _REG_V0		2
#define _REG_V1		3
#define _REG_A0		4
#define _REG_A1		5
#define _REG_A2		6
#define _REG_A3		7
#define _REG_T0		8
#define _REG_T1		9
#define _REG_T2		10
#define _REG_T3		11
#define _REG_T4		12
#define _REG_T5		13
#define _REG_T6		14
#define _REG_T7		15
#define _REG_S0		16
#define _REG_S1		17
#define _REG_S2		18
#define _REG_S3		19
#define _REG_S4		20
#define _REG_S5		21
#define _REG_S6		22
#define _REG_S7		23
#define _REG_T8		24
#define _REG_T9		25
#define _REG_K0		26
#define _REG_K1		27
#define _REG_GP		28
#define _REG_SP		29
#define _REG_S8		30
#define _REG_RA		31

/* XXX: The following conflict with <mips/regnum.h> */
#define _REG_MDLO	32		
#define _REG_MDHI	33
#define _REG_CAUSE	34
#define _REG_EPC	35
#define _REG_SR		36

#ifndef __ASSEMBLER__

/* Make sure this is signed; we need pointers to be sign-extended. */
#if defined(__mips_n32)
typedef	long long       __greg_t;
#else   
typedef	long            __greg_t;
#endif /* __mips_n32 */

typedef	__greg_t	__gregset_t[_NGREG];

/*
 * For the O32 ABI, there are 16 doubles, one at each even FP reg
 * number.  The FP registers themselves are 32-bits.
 *
 * For 64-bit ABIs (include N32), each FP register is a 64-bit double.
 */
typedef	__greg_t	__freg_t;

/*
 * Floating point register state
 */
#if defined(__mips_n32) || defined(_LP64)
typedef struct {
	union {
		double	__fp64_dregs[32];
		__freg_t __fp_regs[32];
	} __fp_r;
	unsigned int	__fp_csr;
	unsigned int	__fp_pad;
} __fpregset_t;
#else /* !(__mips_n32 || _LP64) */
typedef struct {
	union {
		double	__fp_dregs[16];
		float	__fp_fregs[32];
		__freg_t __fp_regs[32];
	} __fp_r;
	unsigned int	__fp_csr;
	unsigned int	__fp_pad;
} __fpregset_t;
#endif /* !(__mips_n32 || _LP64) */

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

#endif /* !__ASSEMBLER__ */

#define _UC_MACHINE_PAD	16	/* Padding appended to ucontext_t */

/*
 * Offsets relative to ucontext_t; intended to be used by assembly stubs.
 */
#if !defined(_MIPS_BSD_API) || _MIPS_BSD_API == _MIPS_BSD_API_LP32
#define _OFFSETOF_UC_GREGS	40
#else
#define _OFFSETOF_UC_GREGS	56
#endif

#define	_UC_SETSTACK	0x00010000
#define	_UC_CLRSTACK	0x00020000

#define _UC_MACHINE_SP(uc)	((uc)->uc_mcontext.__gregs[_REG_SP])
#define _UC_MACHINE_PC(uc)	((uc)->uc_mcontext.__gregs[_REG_EPC])
#define _UC_MACHINE_INTRV(uc)	((uc)->uc_mcontext.__gregs[_REG_V0])

#define	_UC_MACHINE_SET_PC(uc, pc)	_UC_MACHINE_PC(uc) = (pc)

#endif	/* _MIPS_MCONTEXT_H_ */