exception.h

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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.
 */

#ifndef __mips32_EXCEPTION_H__
#define __mips32_EXCEPTION_H__

#ifndef __mips32_TYPES_H__
#  include <arch/types.h>
#endif

#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 {
        __u32 at;
        __u32 v0;
        __u32 v1;
        __u32 a0;
        __u32 a1;
        __u32 a2;
        __u32 a3;
        __u32 t0;
        __u32 t1;
        __u32 t2;
        __u32 t3;
        __u32 t4;
        __u32 t5;
        __u32 t6;
        __u32 t7;
        __u32 s0;
        __u32 s1;
        __u32 s2;
        __u32 s3;
        __u32 s4;
        __u32 s5;
        __u32 s6;
        __u32 s7;
        __u32 t8;
        __u32 t9;
        __u32 gp;
        __u32 sp;
        __u32 s8;
        __u32 ra;
        
        __u32 lo;
        __u32 hi;

        __u32 status; /* cp0_status */
        __u32 epc; /* cp0_epc */
        __u32 k1; /* We use it as thread-local pointer */
};

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

static inline int istate_from_uspace(istate_t *istate)
{
        return istate->status & cp0_status_um_bit;
}
static inline __native 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

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