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1 jermar 1 
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup generic
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 * @{
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 */
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/** @file
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 */
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#ifndef KERN_CONTEXT_H_
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#define KERN_CONTEXT_H_
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#include <arch/types.h>
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#include <typedefs.h>
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#include <arch/context.h>
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#ifndef context_set
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#define context_set(c, _pc, stack, size)    \
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    (c)->pc = (uintptr_t) (_pc);        \
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    (c)->sp = ((uintptr_t) (stack)) + (size) - SP_DELTA;
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#endif /* context_set */
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extern int context_save_arch(context_t *c);
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extern void context_restore_arch(context_t *c) __attribute__ ((noreturn));
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/** Save register context.
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 *
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 * Save current register context (including stack pointers)
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 * to context structure.
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 *
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 * Note that call to context_restore() will return at the same
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 * address as the corresponding call to context_save().
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 *
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 * This MUST be a macro, gcc -O0 does not inline functions even
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 * if they are marked inline and context_save_arch must be called
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 * from level <= that when context_restore is called.
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 *
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 * @param c Context structure.
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 *
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 * @return context_save() returns 1, context_restore() returns 0.
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 */
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#define context_save(c)   context_save_arch(c)
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/** Restore register context.
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 *
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 * Restore previously saved register context (including stack pointers)
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 * from context structure.
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 *
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 * Note that this function does not normally return.
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 * Instead, it returns at the same address as the
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 * corresponding call to context_save(), the only
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 * difference being return value.
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 *
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 * Note that content of any local variable defined by
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 * the caller of context_save() is undefined after
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 * context_restore().
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 *
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 * @param c Context structure.
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 */
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static inline void context_restore(context_t *c)
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{
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    context_restore_arch(c);
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}
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#endif
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/** @}
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 */