Subversion Repositories HelenOS

Rev

Rev 3022 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1 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
 
1819 decky 29
/** @addtogroup generic
1702 cejka 30
 * @{
31
 */
32
/** @file
33
 */
34
 
1888 jermar 35
#ifndef KERN_CONTEXT_H_
36
#define KERN_CONTEXT_H_
1 jermar 37
 
97 jermar 38
#include <arch/types.h>
414 jermar 39
#include <arch/context.h>
1 jermar 40
 
414 jermar 41
 
97 jermar 42
#ifndef context_set
43
#define context_set(c, _pc, stack, size)    \
1780 jermar 44
    (c)->pc = (uintptr_t) (_pc);        \
45
    (c)->sp = ((uintptr_t) (stack)) + (size) - SP_DELTA;
97 jermar 46
#endif /* context_set */
52 vana 47
 
4668 trochtova 48
extern int context_save_arch(context_t *c) __attribute__ ((returns_twice));
414 jermar 49
extern void context_restore_arch(context_t *c) __attribute__ ((noreturn));
1 jermar 50
 
414 jermar 51
/** Save register context.
52
 *
53
 * Save current register context (including stack pointers)
54
 * to context structure.
55
 *
56
 * Note that call to context_restore() will return at the same
57
 * address as the corresponding call to context_save().
58
 *
770 palkovsky 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
61
 * from level <= that when context_restore is called.
62
 *
414 jermar 63
 * @param c Context structure.
64
 *
65
 * @return context_save() returns 1, context_restore() returns 0.
66
 */
770 palkovsky 67
#define context_save(c)   context_save_arch(c)
414 jermar 68
 
69
/** Restore register context.
70
 *
71
 * Restore previously saved register context (including stack pointers)
72
 * from context structure.
73
 *
74
 * Note that this function does not normally return.
75
 * Instead, it returns at the same address as the
76
 * corresponding call to context_save(), the only
77
 * difference being return value.
78
 *
79
 * @param c Context structure.
80
 */
81
static inline void context_restore(context_t *c)
82
{
83
    context_restore_arch(c);
84
}
85
 
1 jermar 86
#endif
1702 cejka 87
 
1819 decky 88
/** @}
1702 cejka 89
 */