/*      $NetBSD: mcontext.h,v 1.17 2025/04/27 02:18:26 uwe 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 _SH3_MCONTEXT_H_
#define _SH3_MCONTEXT_H_

/*
 * Layout of mcontext_t for the sh3 architecture.
 */

#define _REG_GBR        0
#define _REG_PC         1
#define _REG_SR         2
#define _REG_MACL       3
#define _REG_MACH       4
#define _REG_PR         5
#define _REG_R14        6
#define _REG_R13        7
#define _REG_R12        8
#define _REG_R11        9
#define _REG_R10        10
#define _REG_R9         11
#define _REG_R8         12
#define _REG_R7         13
#define _REG_R6         14
#define _REG_R5         15
#define _REG_R4         16
#define _REG_R3         17
#define _REG_R2         18
#define _REG_R1         19
#define _REG_R0         20
#define _REG_R15        21
/* Convenience synonym */
#define _REG_SP         _REG_R15

#define _NGREG          22


#ifndef _LOCORE

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

/*
 * FPU state description.
 * XXX: kernel doesn't support FPU yet, so this is just a placeholder.
 */
typedef struct {
        int             __fpr_fpscr;
        int             __fpr_fpul;
        /* XXX: redefine as a union when we do support FPU */
        int             __fpr_regs[32]; /* SH3E has 16, SH4 has 32 */
} __fpregset_t;

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

#define _UC_MACHINE_SP(uc)      ((uc)->uc_mcontext.__gregs[_REG_SP])
#define _UC_MACHINE_FP(uc)      ((uc)->uc_mcontext.__gregs[_REG_R14])
#define _UC_MACHINE_PC(uc)      ((uc)->uc_mcontext.__gregs[_REG_PC])
#define _UC_MACHINE_INTRV(uc)   ((uc)->uc_mcontext.__gregs[_REG_R0])

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

#endif  /* !_LOCORE */

/*
 * Machine dependent uc_flags
 */
#define _UC_SETSTACK            _UC_MD_BIT16
#define _UC_CLRSTACK            _UC_MD_BIT17
#define _UC_TLSBASE             _UC_MD_BIT19

#endif /* !_SH3_MCONTEXT_H_ */