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