/*
 * 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 arm32interrupt
 * @{
 */

#ifndef KERN_arm32_ISTATE_H_
#define KERN_arm32_ISTATE_H_

#include <arch/regutils.h>

#ifdef KERNEL
#include <typedefs.h>
#include <trace.h>
#else
#include <sys/types.h>
#define NO_TRACE
#endif

/** Struct representing CPU state saved when an exception occurs. */
typedef struct istate {
	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 fp;
	uint32_t r12;
	
	uint32_t pc;
} istate_t;

/** Set Program Counter member of given istate structure.
 *
 * @param istate  istate structure
 * @param retaddr new value of istate's PC member
 *
 */
NO_TRACE static inline void istate_set_retaddr(istate_t *istate,
    uintptr_t retaddr)
{
	istate->pc = retaddr;
}

/** Return true if exception happened while in userspace. */
NO_TRACE static inline int istate_from_uspace(istate_t *istate)
{
	return (istate->spsr & STATUS_REG_MODE_MASK) == USER_MODE;
}

/** Return Program Counter member of given istate structure. */
NO_TRACE static inline uintptr_t istate_get_pc(istate_t *istate)
{
	return istate->pc;
}

NO_TRACE static inline uintptr_t istate_get_fp(istate_t *istate)
{
	return istate->fp;
}

#endif

/** @}
 */