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| 1 | /* |
1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
| 3 | * All rights reserved. |
3 | * All rights reserved. |
| 4 | * |
4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
7 | * are met: |
| 8 | * |
8 | * |
| 9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
| 14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
| 15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
| 16 | * |
16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
27 | */ |
| 28 | 28 | ||
| 29 | #ifndef __CONTEXT_H__ |
29 | #ifndef __CONTEXT_H__ |
| 30 | #define __CONTEXT_H__ |
30 | #define __CONTEXT_H__ |
| 31 | 31 | ||
| 32 | #include <arch/types.h> |
32 | #include <arch/types.h> |
| 33 | #include <typedefs.h> |
33 | #include <typedefs.h> |
| - | 34 | #include <arch/context.h> |
|
| - | 35 | ||
| 34 | 36 | ||
| 35 | #ifndef context_set |
37 | #ifndef context_set |
| 36 | #define context_set(c, _pc, stack, size) \ |
38 | #define context_set(c, _pc, stack, size) \ |
| 37 | (c)->pc = (__address) (_pc); \ |
39 | (c)->pc = (__address) (_pc); \ |
| 38 | (c)->sp = ((__address) (stack)) + (size) - SP_DELTA; |
40 | (c)->sp = ((__address) (stack)) + (size) - SP_DELTA; |
| 39 | #endif /* context_set */ |
41 | #endif /* context_set */ |
| 40 | 42 | ||
| 41 | extern int context_save(context_t *c); |
43 | extern int context_save_arch(context_t *c); |
| 42 | extern void context_restore(context_t *c) __attribute__ ((noreturn)); |
44 | extern void context_restore_arch(context_t *c) __attribute__ ((noreturn)); |
| - | 45 | ||
| - | 46 | /** Save register context. |
|
| - | 47 | * |
|
| - | 48 | * Save current register context (including stack pointers) |
|
| - | 49 | * to context structure. |
|
| - | 50 | * |
|
| - | 51 | * Note that call to context_restore() will return at the same |
|
| - | 52 | * address as the corresponding call to context_save(). |
|
| - | 53 | * |
|
| - | 54 | * @param c Context structure. |
|
| - | 55 | * |
|
| - | 56 | * @return context_save() returns 1, context_restore() returns 0. |
|
| - | 57 | */ |
|
| - | 58 | static inline int context_save(context_t *c) |
|
| - | 59 | { |
|
| - | 60 | return context_save_arch(c); |
|
| - | 61 | } |
|
| - | 62 | ||
| - | 63 | /** Restore register context. |
|
| - | 64 | * |
|
| - | 65 | * Restore previously saved register context (including stack pointers) |
|
| - | 66 | * from context structure. |
|
| - | 67 | * |
|
| - | 68 | * Note that this function does not normally return. |
|
| - | 69 | * Instead, it returns at the same address as the |
|
| - | 70 | * corresponding call to context_save(), the only |
|
| - | 71 | * difference being return value. |
|
| - | 72 | * |
|
| - | 73 | * Note that content of any local variable defined by |
|
| - | 74 | * the caller of context_save() is undefined after |
|
| - | 75 | * context_restore(). |
|
| - | 76 | * |
|
| - | 77 | * @param c Context structure. |
|
| - | 78 | */ |
|
| - | 79 | static inline void context_restore(context_t *c) |
|
| - | 80 | { |
|
| - | 81 | context_restore_arch(c); |
|
| - | 82 | } |
|
| 43 | 83 | ||
| 44 | #endif |
84 | #endif |
| 45 | 85 | ||