| 1 | /*
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| 2 | * Copyright (C) 2001-2004 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #ifndef __CONTEXT_H__
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| 30 | #define __CONTEXT_H__
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| 31 |
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| 32 | #include <arch/types.h>
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| 33 | #include <typedefs.h>
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| 34 | #include <arch/context.h>
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| 35 |
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| 36 |
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| 37 | #ifndef context_set
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| 38 | #define context_set(c, _pc, stack, size) \
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| 39 | (c)->pc = (__address) (_pc); \
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| 40 | (c)->sp = ((__address) (stack)) + (size) - SP_DELTA;
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| 41 | #endif /* context_set */
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| 42 |
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| 43 | extern int context_save_arch(context_t *c);
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| 44 | extern void context_restore_arch(context_t *c) __attribute__ ((noreturn));
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| 45 |
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| 46 | /** Save register context.
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| 47 | *
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| 48 | * Save current register context (including stack pointers)
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| 49 | * to context structure.
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| 50 | *
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| 51 | * Note that call to context_restore() will return at the same
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| 52 | * address as the corresponding call to context_save().
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| 53 | *
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| 54 | * @param c Context structure.
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| 55 | *
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| 56 | * @return context_save() returns 1, context_restore() returns 0.
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| 57 | */
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| 58 | static inline int context_save(context_t *c)
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| 59 | {
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| 60 | return context_save_arch(c);
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| 61 | }
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| 62 |
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| 63 | /** Restore register context.
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| 64 | *
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| 65 | * Restore previously saved register context (including stack pointers)
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| 66 | * from context structure.
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| 67 | *
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| 68 | * Note that this function does not normally return.
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| 69 | * Instead, it returns at the same address as the
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| 70 | * corresponding call to context_save(), the only
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| 71 | * difference being return value.
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| 72 | *
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| 73 | * Note that content of any local variable defined by
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| 74 | * the caller of context_save() is undefined after
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| 75 | * context_restore().
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| 76 | *
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| 77 | * @param c Context structure.
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| 78 | */
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| 79 | static inline void context_restore(context_t *c)
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| 80 | {
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| 81 | context_restore_arch(c);
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| 82 | }
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| 83 |
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| 84 | #endif
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