/*      $NetBSD: mcontext.h,v 1.28 2025/04/09 06:00:38 rin Exp $        */

/*-
 * Copyright (c) 1999, 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Klaus Klein, and by Jason R. Thorpe of Wasabi Systems, Inc.
 *
 * 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 _MIPS_MCONTEXT_H_
#define _MIPS_MCONTEXT_H_

/*
 * General register state
 */
#define _NGREG          37      /* R0-R31, MDLO, MDHI, CAUSE, PC, SR */

#define _REG_R0         0
#define _REG_AT         1
#define _REG_V0         2
#define _REG_V1         3
#define _REG_A0         4
#define _REG_A1         5
#define _REG_A2         6
#define _REG_A3         7
#define _REG_T0         8
#define _REG_T1         9
#define _REG_T2         10
#define _REG_T3         11
#define _REG_T4         12
#define _REG_T5         13
#define _REG_T6         14
#define _REG_T7         15
#define _REG_S0         16
#define _REG_S1         17
#define _REG_S2         18
#define _REG_S3         19
#define _REG_S4         20
#define _REG_S5         21
#define _REG_S6         22
#define _REG_S7         23
#define _REG_T8         24
#define _REG_T9         25
#define _REG_K0         26
#define _REG_K1         27
#define _REG_GP         28
#define _REG_SP         29
#define _REG_S8         30
#define _REG_RA         31

/* XXX: The following conflict with <mips/regnum.h> */
#define _REG_MDLO       32
#define _REG_MDHI       33
#define _REG_CAUSE      34
#define _REG_EPC        35
#define _REG_SR         36

#ifndef __ASSEMBLER__

/* Make sure this is signed; we need pointers to be sign-extended. */
#if defined(__mips_n32)
typedef long long       __greg_t;
#else
typedef long            __greg_t;
#endif /* __mips_n32 */

typedef __greg_t        __gregset_t[_NGREG];

/*
 * For the O32/O64 ABI, there are 16 doubles, one at each even FP reg
 * number.  The FP registers themselves are 32-bits.
 *
 * For 64-bit ABIs (include N32), each FP register is a 64-bit double.
 */
typedef __greg_t        __freg_t;

/*
 * Floating point register state
 */
struct __fpregset_nabi {
        union {
                double  __fp64_dregs[32];
                __freg_t __fp_regs[32];
        } __fp_r;
        __greg_t        __fp_csr;
};
struct __fpregset_oabi {
        union {
                double  __fp_dregs[16];
                float   __fp_fregs[32];
                __int32_t __fp_regs[32];
        } __fp_r;
        unsigned int    __fp_csr;
        unsigned int    __fp_pad;
};

#if __mips_n32 || __mips_n64
typedef struct __fpregset_nabi __fpregset_t;
#else
typedef struct __fpregset_oabi __fpregset_t;
#endif

typedef struct {
        __gregset_t     __gregs;
        __fpregset_t    __fpregs;
        __greg_t        _mc_tlsbase;
#if !__mips_n32
        __greg_t        __mc_unused;
#endif
} mcontext_t;

#if defined(_KERNEL) && !defined(__mips_o32)
typedef __int32_t       __greg32_t;
typedef __greg32_t      __gregset32_t[_NGREG];

typedef struct {
        __gregset32_t           __gregs;
        struct __fpregset_oabi  __fpregs;
        __greg32_t              _mc_tlsbase;
        __greg32_t              __mc_unused;
} mcontext_o32_t;

typedef struct {
        __gregset_t             __gregs;
        struct __fpregset_nabi  __fpregs;
        __greg_t                _mc_tlsbase;
} mcontext32_t;

#endif /* _KERNEL && _LP64 */

#endif /* !__ASSEMBLER__ */

#define _UC_MACHINE_PAD         14      /* Padding appended to ucontext_t */

#define _UC_SETSTACK    0x00010000
#define _UC_CLRSTACK    0x00020000
#define _UC_TLSBASE     0x00040000

#define _UC_MACHINE_SP(uc)      ((uc)->uc_mcontext.__gregs[_REG_SP])
#define _UC_MACHINE_FP(uc)      ((uc)->uc_mcontext.__gregs[_REG_S8])
#define _UC_MACHINE_PC(uc)      ((uc)->uc_mcontext.__gregs[_REG_EPC])
#define _UC_MACHINE_INTRV(uc)   ((uc)->uc_mcontext.__gregs[_REG_V0])

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

#define _UC_MACHINE32_SP(uc)    _UC_MACHINE_SP(uc)
#define _UC_MACHINE32_PC(uc)    _UC_MACHINE_PC(uc)
#define _UC_MACHINE32_INTRV(uc) _UC_MACHINE_INTRV(uc)
#define _UC_MACHINE32_PAD       14      /* Padding appended to ucontext32_t */

#define _UC_MACHINE32_SET_PC(uc, pc)    _UC_MACHINE_PC((uc), (pc))

#define __UCONTEXT_SIZE_O32     (40 + 296 +  56)        /* 392 */
#define __UCONTEXT_SIZE_N32     (40 + 568 +  56)        /* 664 */
#define __UCONTEXT_SIZE_N64     (56 + 576 + 112)        /* 744 */

#ifdef __mips_o32
#define __UCONTEXT_SIZE         __UCONTEXT_SIZE_O32
#elif __mips_n32
#define __UCONTEXT_SIZE         __UCONTEXT_SIZE_N32
#elif __mips_n64
#define __UCONTEXT_SIZE         __UCONTEXT_SIZE_N64
#define __UCONTEXT32_SIZE       __UCONTEXT_SIZE_N32
#else
#error O64 is not supported
#endif

#endif  /* _MIPS_MCONTEXT_H_ */