/*
* Copyright (c) 2010 Martin Decky
* 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 kernel_abs32le_interrupt
* @{
*/
/** @file
*/
#ifndef KERN_abs32le_ISTATE_H_
#define KERN_abs32le_ISTATE_H_
#include <trace.h>
#ifdef KERNEL
#include <typedefs.h>
#include <verify.h>
#else /* KERNEL */
#include <stdint.h>
#define REQUIRES_EXTENT_MUTABLE(arg)
#define WRITES(arg)
#endif /* KERNEL */
/*
* On real hardware this stores the registers which
* need to be preserved during interupts.
*/
typedef struct istate {
uintptr_t ip;
uintptr_t fp;
uint32_t stack[];
} istate_t;
_NO_TRACE static inline int istate_from_uspace(istate_t *istate)
REQUIRES_EXTENT_MUTABLE(istate)
{
/*
* On real hardware this checks whether the interrupted
* context originated from user space.
*/
return !(istate->ip & UINT32_C(0x80000000));
}
_NO_TRACE static inline void istate_set_retaddr(istate_t *istate,
uintptr_t retaddr)
WRITES(&istate->ip)
{
/* On real hardware this sets the instruction pointer. */
istate->ip = retaddr;
}
_NO_TRACE static inline uintptr_t istate_get_pc(istate_t *istate)
REQUIRES_EXTENT_MUTABLE(istate)
{
/* On real hardware this returns the instruction pointer. */
return istate->ip;
}
_NO_TRACE static inline uintptr_t istate_get_fp(istate_t *istate)
REQUIRES_EXTENT_MUTABLE(istate)
{
/* On real hardware this returns the frame pointer. */
return istate->fp;
}
#endif
/** @}
*/