/*      $NetBSD: mcontext.h,v 1.16 2024/11/30 01:04:11 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 _M68K_MCONTEXT_H_
#define _M68K_MCONTEXT_H_

#ifdef _KERNEL
#include <m68k/cpuframe.h>
#endif

/*
* mcontext extensions to handle signal delivery.
*/
#define _UC_SETSTACK    _UC_MD_BIT16
#define _UC_CLRSTACK    _UC_MD_BIT17

/*
* General register state
*/
#define _NGREG          18
typedef int             __greg_t;
typedef __greg_t        __gregset_t[_NGREG];

#define _REG_D0 0
#define _REG_D1 1
#define _REG_D2 2
#define _REG_D3 3
#define _REG_D4 4
#define _REG_D5 5
#define _REG_D6 6
#define _REG_D7 7
#define _REG_A0 8
#define _REG_A1 9
#define _REG_A2 10
#define _REG_A3 11
#define _REG_A4 12
#define _REG_A5 13
#define _REG_A6 14
#define _REG_A7 15
#define _REG_PC 16
#define _REG_PS 17

typedef struct {
       int     __fp_pcr;
       int     __fp_psr;
       int     __fp_piaddr;
       int     __fp_fpregs[8*3];
} __fpregset_t;

typedef struct {
       __gregset_t     __gregs;        /* General Register set */
       __fpregset_t    __fpregs;       /* Floating Point Register set */
       union {
               long    __mc_state[201];        /* Only need 308 bytes... */
#if defined(_KERNEL) || defined(__M68K_MCONTEXT_PRIVATE)
               struct {
                       /* Rest of the frame. */
                       unsigned int    __mcf_format;
                       unsigned int    __mcf_vector;
                       union F_u       __mcf_exframe;
                       /* Rest of the FPU frame. */
                       union FPF_u1    __mcf_fpf_u1;
                       union FPF_u2    __mcf_fpf_u2;
               } __mc_frame;
#endif /* _KERNEL || __M68K_MCONTEXT_PRIVATE */
       }               __mc_pad;
       __greg_t        _mc_tlsbase;
} mcontext_t;

/* Note: no additional padding is to be performed in ucontext_t. */

/* Machine-specific uc_flags value */
#define _UC_M68K_UC_USER _UC_MD_BIT30
#define _UC_TLSBASE     _UC_MD_BIT19

#define _UC_MACHINE_SP(uc)      ((uc)->uc_mcontext.__gregs[_REG_A7])
#define _UC_MACHINE_FP(uc)      ((uc)->uc_mcontext.__gregs[_REG_A6])
#define _UC_MACHINE_PC(uc)      ((uc)->uc_mcontext.__gregs[_REG_PC])
#define _UC_MACHINE_INTRV(uc)   ((uc)->uc_mcontext.__gregs[_REG_D0])

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

#define __UCONTEXT_SIZE 1024

#endif  /* !_M68K_MCONTEXT_H_ */