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| 1 | jermar | 1 | /* |
| 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 | |||
| 29 | #ifndef __CONTEXT_H__ |
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| 30 | #define __CONTEXT_H__ |
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| 31 | |||
| 97 | jermar | 32 | #include <arch/types.h> |
| 1 | jermar | 33 | #include <typedefs.h> |
| 414 | jermar | 34 | #include <arch/context.h> |
| 1 | jermar | 35 | |
| 414 | jermar | 36 | |
| 97 | jermar | 37 | #ifndef context_set |
| 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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| 52 | vana | 42 | |
| 414 | jermar | 43 | extern int context_save_arch(context_t *c); |
| 44 | extern void context_restore_arch(context_t *c) __attribute__ ((noreturn)); |
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| 1 | jermar | 45 | |
| 414 | jermar | 46 | /** Save register context. |
| 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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| 770 | palkovsky | 54 | * This MUST be a macro, gcc -O0 does not inline functions even |
| 55 | * if they are marked inline and context_save_arch must be called |
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| 56 | * from level <= that when context_restore is called. |
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| 57 | * |
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| 414 | jermar | 58 | * @param c Context structure. |
| 59 | * |
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| 60 | * @return context_save() returns 1, context_restore() returns 0. |
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| 61 | */ |
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| 770 | palkovsky | 62 | #define context_save(c) context_save_arch(c) |
| 414 | jermar | 63 | |
| 64 | /** Restore register context. |
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| 65 | * |
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| 66 | * Restore previously saved register context (including stack pointers) |
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| 67 | * from context structure. |
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| 68 | * |
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| 69 | * Note that this function does not normally return. |
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| 70 | * Instead, it returns at the same address as the |
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| 71 | * corresponding call to context_save(), the only |
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| 72 | * difference being return value. |
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| 73 | * |
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| 74 | * Note that content of any local variable defined by |
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| 75 | * the caller of context_save() is undefined after |
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| 76 | * context_restore(). |
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| 77 | * |
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| 78 | * @param c Context structure. |
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| 79 | */ |
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| 80 | static inline void context_restore(context_t *c) |
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| 81 | { |
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| 82 | context_restore_arch(c); |
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| 83 | } |
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| 84 | |||
| 1 | jermar | 85 | #endif |