/* $NetBSD: mcontext.h,v 1.12 2024/11/30 01:04:13 christos Exp $ */

/*-
 * Copyright (c) 2014 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Matt Thomas of 3am Software Foundry.
 *
 * 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 _RISCV_MCONTEXT_H_
#define _RISCV_MCONTEXT_H_

/*
 */

#define _NGREG  32              /* GR1-31 */
#define _NFREG  33              /* F0-31, FCSR */

/*
 * This fragment is common to <riscv/mcontext.h> and <riscv/reg.h>
 */
#ifndef _BSD_FPREG_T_
union __fpreg {
                __uint64_t u_u64;
                double u_d;
};
#define _BSD_FPREG_T_   union __fpreg
#endif

typedef long            __greg_t;
typedef __greg_t        __gregset_t[_NGREG];
typedef __uint32_t      __greg32_t;
typedef __greg32_t      __gregset32_t[_NGREG];
typedef _BSD_FPREG_T_   __fregset_t[_NFREG];

#define _REG_X1         0
#define _REG_X2         1
#define _REG_X3         2
#define _REG_X4         3
#define _REG_X5         4
#define _REG_X6         5
#define _REG_X7         6
#define _REG_X8         7
#define _REG_X9         8
#define _REG_X10        9
#define _REG_X11        10
#define _REG_X12        11
#define _REG_X13        12
#define _REG_X14        13
#define _REG_X15        14
#define _REG_X16        15
#define _REG_X17        16
#define _REG_X18        17
#define _REG_X19        18
#define _REG_X20        19
#define _REG_X21        20
#define _REG_X22        21
#define _REG_X23        22
#define _REG_X24        23
#define _REG_X25        24
#define _REG_X26        25
#define _REG_X27        26
#define _REG_X28        27
#define _REG_X29        28
#define _REG_X30        29
#define _REG_X31        30
#define _REG_PC         31

#define _REG_RA         _REG_X1
#define _REG_SP         _REG_X2
#define _REG_GP         _REG_X3
#define _REG_TP         _REG_X4
#define _REG_T0         _REG_X5
#define _REG_T1         _REG_X6
#define _REG_T2         _REG_X7
#define _REG_S0         _REG_X8
#define _REG_S1         _REG_X9
#define _REG_RV         _REG_X10
#define _REG_A0         _REG_X10
#define _REG_A1         _REG_X11
#define _REG_A2         _REG_X12
#define _REG_A3         _REG_X13
#define _REG_A4         _REG_X14
#define _REG_A5         _REG_X15
#define _REG_A6         _REG_X16
#define _REG_A7         _REG_X17
#define _REG_S2         _REG_X18
#define _REG_S3         _REG_X19
#define _REG_S4         _REG_X20
#define _REG_S5         _REG_X21
#define _REG_S6         _REG_X22
#define _REG_S7         _REG_X23
#define _REG_S8         _REG_X24
#define _REG_S9         _REG_X25
#define _REG_S10        _REG_X26
#define _REG_S11        _REG_X27
#define _REG_T3         _REG_X28
#define _REG_T4         _REG_X29
#define _REG_T5         _REG_X30
#define _REG_T6         _REG_X31

#define _REG_F0         0
#define _REG_FPCSR      32

typedef struct {
        __gregset_t     __gregs;        /* General Purpose Register set */
        __fregset_t     __fregs;        /* Floating Point Register set */
        __greg_t        __spare[7];     /* future proof */
} mcontext_t;

typedef struct {
        __gregset32_t   __gregs;        /* General Purpose Register set */
        __fregset_t     __fregs;        /* Floating Point Register set */
        __greg32_t      __spare[7];     /* future proof */
} mcontext32_t;

/* Machine-dependent uc_flags */
#define _UC_SETSTACK    0x00010000      /* see <sys/ucontext.h> */
#define _UC_CLRSTACK    0x00020000      /* see <sys/ucontext.h> */
#define _UC_TLSBASE     0x00080000      /* see <sys/ucontext.h> */

#define _UC_MACHINE_SP(uc)              ((uc)->uc_mcontext.__gregs[_REG_SP])
#define _UC_MACHINE_FP(uc)              ((uc)->uc_mcontext.__gregs[_REG_S0])
#define _UC_MACHINE_PC(uc)              ((uc)->uc_mcontext.__gregs[_REG_PC])
#define _UC_MACHINE_INTRV(uc)           ((uc)->uc_mcontext.__gregs[_REG_RV])

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

#endif /* !_RISCV_MCONTEXT_H_ */