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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 | /** @addtogroup generic |
|
- | 30 | * @{ |
|
- | 31 | */ |
|
- | 32 | /** @file |
|
- | 33 | */ |
|
- | 34 | ||
29 | #ifndef __CONTEXT_H__ |
35 | #ifndef __CONTEXT_H__ |
30 | #define __CONTEXT_H__ |
36 | #define __CONTEXT_H__ |
31 | 37 | ||
32 | #include <arch/types.h> |
38 | #include <arch/types.h> |
33 | #include <typedefs.h> |
39 | #include <typedefs.h> |
34 | #include <arch/context.h> |
40 | #include <arch/context.h> |
35 | 41 | ||
36 | 42 | ||
37 | #ifndef context_set |
43 | #ifndef context_set |
38 | #define context_set(c, _pc, stack, size) \ |
44 | #define context_set(c, _pc, stack, size) \ |
39 | (c)->pc = (__address) (_pc); \ |
45 | (c)->pc = (__address) (_pc); \ |
40 | (c)->sp = ((__address) (stack)) + (size) - SP_DELTA; |
46 | (c)->sp = ((__address) (stack)) + (size) - SP_DELTA; |
41 | #endif /* context_set */ |
47 | #endif /* context_set */ |
42 | 48 | ||
43 | extern int context_save_arch(context_t *c); |
49 | extern int context_save_arch(context_t *c); |
44 | extern void context_restore_arch(context_t *c) __attribute__ ((noreturn)); |
50 | extern void context_restore_arch(context_t *c) __attribute__ ((noreturn)); |
45 | 51 | ||
46 | /** Save register context. |
52 | /** Save register context. |
47 | * |
53 | * |
48 | * Save current register context (including stack pointers) |
54 | * Save current register context (including stack pointers) |
49 | * to context structure. |
55 | * to context structure. |
50 | * |
56 | * |
51 | * Note that call to context_restore() will return at the same |
57 | * Note that call to context_restore() will return at the same |
52 | * address as the corresponding call to context_save(). |
58 | * address as the corresponding call to context_save(). |
53 | * |
59 | * |
54 | * This MUST be a macro, gcc -O0 does not inline functions even |
60 | * 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 |
61 | * if they are marked inline and context_save_arch must be called |
56 | * from level <= that when context_restore is called. |
62 | * from level <= that when context_restore is called. |
57 | * |
63 | * |
58 | * @param c Context structure. |
64 | * @param c Context structure. |
59 | * |
65 | * |
60 | * @return context_save() returns 1, context_restore() returns 0. |
66 | * @return context_save() returns 1, context_restore() returns 0. |
61 | */ |
67 | */ |
62 | #define context_save(c) context_save_arch(c) |
68 | #define context_save(c) context_save_arch(c) |
63 | 69 | ||
64 | /** Restore register context. |
70 | /** Restore register context. |
65 | * |
71 | * |
66 | * Restore previously saved register context (including stack pointers) |
72 | * Restore previously saved register context (including stack pointers) |
67 | * from context structure. |
73 | * from context structure. |
68 | * |
74 | * |
69 | * Note that this function does not normally return. |
75 | * Note that this function does not normally return. |
70 | * Instead, it returns at the same address as the |
76 | * Instead, it returns at the same address as the |
71 | * corresponding call to context_save(), the only |
77 | * corresponding call to context_save(), the only |
72 | * difference being return value. |
78 | * difference being return value. |
73 | * |
79 | * |
74 | * Note that content of any local variable defined by |
80 | * Note that content of any local variable defined by |
75 | * the caller of context_save() is undefined after |
81 | * the caller of context_save() is undefined after |
76 | * context_restore(). |
82 | * context_restore(). |
77 | * |
83 | * |
78 | * @param c Context structure. |
84 | * @param c Context structure. |
79 | */ |
85 | */ |
80 | static inline void context_restore(context_t *c) |
86 | static inline void context_restore(context_t *c) |
81 | { |
87 | { |
82 | context_restore_arch(c); |
88 | context_restore_arch(c); |
83 | } |
89 | } |
84 | 90 | ||
85 | #endif |
91 | #endif |
- | 92 | ||
- | 93 | /** @} |
|
- | 94 | */ |
|
- | 95 | ||
86 | 96 |