source: mainline/generic/include/context.h@ 2ba7810

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 2ba7810 was e1888f9, checked in by Ondrej Palkovsky <ondrap@…>, 19 years ago

Fix context_save, so that it works even with inlines disabled (-O0).

  • Property mode set to 100644
File size: 3.0 KB
RevLine 
[f761f1eb]1/*
2 * Copyright (C) 2001-2004 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
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
15 * derived from this software without specific prior written permission.
16 *
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
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef __CONTEXT_H__
30#define __CONTEXT_H__
31
[d5d2a3f]32#include <arch/types.h>
[f761f1eb]33#include <typedefs.h>
[4b2c872d]34#include <arch/context.h>
35
[0ca6faa]36
[d5d2a3f]37#ifndef context_set
38#define context_set(c, _pc, stack, size) \
39 (c)->pc = (__address) (_pc); \
40 (c)->sp = ((__address) (stack)) + (size) - SP_DELTA;
41#endif /* context_set */
[f761f1eb]42
[4b2c872d]43extern int context_save_arch(context_t *c);
44extern 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 *
[e1888f9]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 *
[4b2c872d]58 * @param c Context structure.
59 *
60 * @return context_save() returns 1, context_restore() returns 0.
61 */
[e1888f9]62#define context_save(c) context_save_arch(c)
[4b2c872d]63
64/** Restore register context.
65 *
66 * Restore previously saved register context (including stack pointers)
67 * from context structure.
68 *
69 * Note that this function does not normally return.
70 * Instead, it returns at the same address as the
71 * corresponding call to context_save(), the only
72 * difference being return value.
73 *
74 * Note that content of any local variable defined by
75 * the caller of context_save() is undefined after
76 * context_restore().
77 *
78 * @param c Context structure.
79 */
80static inline void context_restore(context_t *c)
81{
82 context_restore_arch(c);
83}
[f761f1eb]84
85#endif
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