/*      $NetBSD: mcontext.h,v 1.15 2024/11/30 01:04:06 christos Exp $   */

/*-
 * Copyright (c) 2001 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.
 *
 * 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 _ALPHA_MCONTEXT_H_
#define _ALPHA_MCONTEXT_H_

/*
 * General register state (important: 0-31 maps to `struct reg')
 */
#define _NGREG          34      /* 0-31, PC, PS */
typedef unsigned long   __greg_t;
typedef __greg_t        __gregset_t[_NGREG];

/* Convenience synonyms */
#define _REG_V0         0
#define _REG_T0         1
#define _REG_T1         2
#define _REG_T2         3
#define _REG_T3         4
#define _REG_T4         5
#define _REG_T5         6
#define _REG_T6         7
#define _REG_T7         8
#define _REG_S0         9
#define _REG_S1         10
#define _REG_S2         11
#define _REG_S3         12
#define _REG_S4         13
#define _REG_S5         14
#define _REG_S6         15
#define _REG_A0         16
#define _REG_A1         17
#define _REG_A2         18
#define _REG_A3         19
#define _REG_A4         20
#define _REG_A5         21
#define _REG_T8         22
#define _REG_T9         23
#define _REG_T10        24
#define _REG_T11        25
#define _REG_RA         26
#define _REG_T12        27
#define _REG_PV         27
#define _REG_AT         28
#define _REG_GP         29
#define _REG_SP         30
#define _REG_UNIQUE     31
#define _REG_PC         32
#define _REG_PS         33

/*
 * Floating point register state (important: maps to `struct fpreg')
 */
typedef struct {
        union {
                unsigned long   __fp_regs[32];
                double          __fp_dregs[32];
        }               __fp_fr;
        unsigned long   __fp_fpcr;
} __fpregset_t;

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

/* Machine-dependent uc_flags */
#define _UC_TLSBASE     _UC_MD_BIT5     /* valid value in _REG_UNIQUE */
#define _UC_SETSTACK    _UC_MD_BIT16
#define _UC_CLRSTACK    _UC_MD_BIT17

#define _UC_MACHINE_SP(uc)      ((uc)->uc_mcontext.__gregs[_REG_SP])
#define _UC_MACHINE_FP(uc)      ((uc)->uc_mcontext.__gregs[_REG_S6])
#define _UC_MACHINE_PC(uc)      ((uc)->uc_mcontext.__gregs[_REG_PC])
#define _UC_MACHINE_INTRV(uc)   ((uc)->uc_mcontext.__gregs[_REG_V0])

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

#endif  /* !_ALPHA_MCONTEXT_H_ */