/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2015 Nexenta Systems, Inc.  All rights reserved.
 *
 * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
 */
/*      Copyright (c) 1990, 1991 UNIX System Laboratories, Inc. */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T         */
/*      All Rights Reserved     */

/*
 * Essential struct definitions for mcontext_t needed by ucontext.h
 * These were formerly in regset.h, which now includes this file.
 */

#ifndef _SYS_MCONTEXT_H
#define _SYS_MCONTEXT_H

#include <sys/feature_tests.h>

#if !defined(_ASM)
#include <sys/types.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif

/*
 * A gregset_t is defined as an array type for compatibility with the reference
 * source. This is important due to differences in the way the C language
 * treats arrays and structures as parameters.
 */
#if defined(__amd64)
#define _NGREG  28
#else
#define _NGREG  19
#endif

#if !defined(_ASM)

#if defined(_LP64)
typedef long    greg_t;
#else
typedef int     greg_t;
#endif

#if defined(_SYSCALL32)

typedef int32_t greg32_t;
typedef int64_t greg64_t;

#endif  /* _SYSCALL32 */

typedef greg_t  gregset_t[_NGREG];

#if defined(_SYSCALL32)

#define _NGREG32        19
#define _NGREG64        28

typedef greg32_t gregset32_t[_NGREG32];
typedef greg64_t gregset64_t[_NGREG64];

#endif  /* _SYSCALL32 */

/*
 * Floating point definitions.
 */

#if defined(__amd64)

typedef struct _fpu {
        union {
                struct _fpchip_state {
                        uint16_t cw;
                        uint16_t sw;
                        uint8_t  fctw;
                        uint8_t  __fx_rsvd;
                        uint16_t fop;
                        uint64_t rip;
                        uint64_t rdp;
                        uint32_t mxcsr;
                        uint32_t mxcsr_mask;
                        union {
                                uint16_t fpr_16[5];
                                upad128_t __fpr_pad;
                        } st[8];
                        upad128_t xmm[16];
                        upad128_t __fx_ign2[6];
                        uint32_t status;        /* sw at exception */
                        uint32_t xstatus;       /* mxcsr at exception */
                } fpchip_state;
                uint32_t        f_fpregs[130];
        } fp_reg_set;
} fpregset_t;

#else   /* __i386 */

/*
 * This definition of the floating point structure is binary
 * compatible with the Intel386 psABI definition, and source
 * compatible with that specification for x87-style floating point.
 * It also allows SSE/SSE2 state to be accessed on machines that
 * possess such hardware capabilities.
 */
typedef struct _fpu {
        union {
                struct _fpchip_state {
                        uint32_t state[27];     /* 287/387 saved state */
                        uint32_t status;        /* saved at exception */
                        uint32_t mxcsr;         /* SSE control and status */
                        uint32_t xstatus;       /* SSE mxcsr at exception */
                        uint32_t __pad[2];      /* align to 128-bits */
                        upad128_t xmm[8];       /* %xmm0-%xmm7 */
                } fpchip_state;
                struct _fp_emul_space {         /* for emulator(s) */
                        uint8_t fp_emul[246];
                        uint8_t fp_epad[2];
                } fp_emul_space;
                uint32_t        f_fpregs[95];   /* union of the above */
        } fp_reg_set;
} fpregset_t;

#endif  /* __i386 */

#if defined(_SYSCALL32)

/* Kernel view of user i386 fpu structure */

typedef struct fpu32 {
        union {
                struct fpchip32_state {
                        uint32_t state[27];     /* 287/387 saved state */
                        uint32_t status;        /* saved at exception */
                        uint32_t mxcsr;         /* SSE control and status */
                        uint32_t xstatus;       /* SSE mxcsr at exception */
                        uint32_t __pad[2];      /* align to 128-bits */
                        uint32_t xmm[8][4];     /* %xmm0-%xmm7 */
                } fpchip_state;
                uint32_t        f_fpregs[95];   /* union of the above */
        } fp_reg_set;
} fpregset32_t;

#endif  /* _SYSCALL32 */

/*
 * Structure mcontext defines the complete hardware machine state.
 * (This structure is specified in the i386 ABI suppl.)
 */
typedef struct {
        gregset_t       gregs;          /* general register set */
        fpregset_t      fpregs;         /* floating point register set */
} mcontext_t;

#if defined(_SYSCALL32)

typedef struct {
        gregset32_t     gregs;          /* general register set */
        fpregset32_t    fpregs;         /* floating point register set */
} mcontext32_t;

#endif  /* _SYSCALL32 */

#endif  /* _ASM */

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_MCONTEXT_H */