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