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/*

 * Copyright (c) 2007 Michal Kebrt, Petr Stepan

 *

 * 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 arm32  

 * @{

 */

/** @file

 *  @brief Exception declarations.

 */

#ifndef KERN_arm32_EXCEPTION_H_

#define KERN_arm32_EXCEPTION_H_

#include <arch/types.h>

#include <arch/regutils.h>

/** If defined, forces using of high exception vectors. */

#define HIGH_EXCEPTION_VECTORS

#ifdef HIGH_EXCEPTION_VECTORS

    #define EXC_BASE_ADDRESS    0xffff0000

#else

    #define EXC_BASE_ADDRESS    0x0

#endif

/* Exception Vectors */

#define EXC_RESET_VEC          (EXC_BASE_ADDRESS + 0x0)

#define EXC_UNDEF_INSTR_VEC    (EXC_BASE_ADDRESS + 0x4)

#define EXC_SWI_VEC            (EXC_BASE_ADDRESS + 0x8)

#define EXC_PREFETCH_ABORT_VEC (EXC_BASE_ADDRESS + 0xc)

#define EXC_DATA_ABORT_VEC     (EXC_BASE_ADDRESS + 0x10)

#define EXC_IRQ_VEC            (EXC_BASE_ADDRESS + 0x18)

#define EXC_FIQ_VEC            (EXC_BASE_ADDRESS + 0x1c)

/* Exception numbers */

#define EXC_RESET           0

#define EXC_UNDEF_INSTR     1

#define EXC_SWI             2

#define EXC_PREFETCH_ABORT  3

#define EXC_DATA_ABORT      4

#define EXC_IRQ             5

#define EXC_FIQ             6

/** Kernel stack pointer.

 *

 * It is set when thread switches to user mode,

 * and then used for exception handling.

 */

extern uintptr_t supervisor_sp;

/** Temporary exception stack pointer.

 *

 * Temporary stack is used in exceptions handling routines

 * before switching to thread's kernel stack.

 */

extern uintptr_t exc_stack;

/** Struct representing CPU state saved when an exception occurs. */

typedef struct {

    uint32_t spsr;

    uint32_t sp;

    uint32_t lr;

    uint32_t r0;

    uint32_t r1;

    uint32_t r2;

    uint32_t r3;

    uint32_t r4;

    uint32_t r5;

    uint32_t r6;

    uint32_t r7;

    uint32_t r8;

    uint32_t r9;

    uint32_t r10;

    uint32_t r11;

    uint32_t r12;

    uint32_t pc;

} istate_t;

/** Sets Program Counter member of given istate structure.

 *

 * @param istate istate structure

 * @param retaddr new value of istate's PC member

 */

static inline void istate_set_retaddr(istate_t *istate, uintptr_t retaddr)

{

    istate->pc = retaddr;

}

/** Returns true if exception happened while in userspace. */

static inline int istate_from_uspace(istate_t *istate)

{

    return (istate->spsr & STATUS_REG_MODE_MASK) == USER_MODE;

}

/** Returns Program Counter member of given istate structure. */

static inline unative_t istate_get_pc(istate_t *istate)

{

    return istate->pc;

}

extern void install_exception_handlers(void);

extern void exception_init(void);

extern void print_istate(istate_t *istate);

extern void reset_exception_entry(void);

extern void irq_exception_entry(void);

extern void fiq_exception_entry(void);

extern void undef_instr_exception_entry(void);

extern void prefetch_abort_exception_entry(void);

extern void data_abort_exception_entry(void);

extern void swi_exception_entry(void);

#endif

/** @}

 */