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/*
 * Copyright (c) 2003-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/** @addtogroup mips32  
 * @{
 */
/** @file
 */

#ifndef KERN_mips32_EXCEPTION_H_
#define KERN_mips32_EXCEPTION_H_

#include <arch/types.h>
#include <typedefs.h>
#include <arch/cp0.h>

#define EXC_Int     0
#define EXC_Mod     1
#define EXC_TLBL    2
#define EXC_TLBS    3
#define EXC_AdEL    4
#define EXC_AdES    5
#define EXC_IBE     6
#define EXC_DBE     7
#define EXC_Sys     8
#define EXC_Bp      9
#define EXC_RI      10
#define EXC_CpU     11
#define EXC_Ov      12
#define EXC_Tr      13
#define EXC_VCEI    14
#define EXC_FPE     15
#define EXC_WATCH   23
#define EXC_VCED    31

struct istate {
    uint32_t at;
    uint32_t v0;
    uint32_t v1;
    uint32_t a0;
    uint32_t a1;
    uint32_t a2;
    uint32_t a3;
    uint32_t t0;
    uint32_t t1;
    uint32_t t2;
    uint32_t t3;
    uint32_t t4;
    uint32_t t5;
    uint32_t t6;
    uint32_t t7;
    uint32_t s0;
    uint32_t s1;
    uint32_t s2;
    uint32_t s3;
    uint32_t s4;
    uint32_t s5;
    uint32_t s6;
    uint32_t s7;
    uint32_t t8;
    uint32_t t9;
    uint32_t gp;
    uint32_t sp;
    uint32_t s8;
    uint32_t ra;
    
    uint32_t lo;
    uint32_t hi;

    uint32_t status; /* cp0_status */
    uint32_t epc; /* cp0_epc */
    uint32_t k1; /* We use it as thread-local pointer */
};

static inline void istate_set_retaddr(istate_t *istate, uintptr_t retaddr)
{
    istate->epc = retaddr;
}

/** Return true if exception happened while in userspace */
static inline int istate_from_uspace(istate_t *istate)
{
    return istate->status & cp0_status_um_bit;
}
static inline unative_t istate_get_pc(istate_t *istate)
{
    return istate->epc;
}

extern void exception(istate_t *istate);
extern void tlb_refill_entry(void);
extern void exception_entry(void);
extern void cache_error_entry(void);
extern void exception_init(void);

#endif

/** @}
 */