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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 ia32 |
29 | /** @addtogroup ia32 |
| 30 | * @{ |
30 | * @{ |
| 31 | */ |
31 | */ |
| 32 | /** @file |
32 | /** @file |
| 33 | */ |
33 | */ |
| 34 | 34 | ||
| 35 | #ifndef KERN_ia32_CONTEXT_H_ |
35 | #ifndef KERN_ia32_CONTEXT_H_ |
| 36 | #define KERN_ia32_CONTEXT_H_ |
36 | #define KERN_ia32_CONTEXT_H_ |
| 37 | 37 | ||
| 38 | #include <arch/types.h> |
38 | #include <arch/types.h> |
| 39 | 39 | ||
| 40 | #define STACK_ITEM_SIZE 4 |
40 | #define STACK_ITEM_SIZE 4 |
| 41 | 41 | ||
| 42 | /* |
42 | /* |
| 43 | * Both context_save() and context_restore() eat two doublewords from the stack. |
43 | * Both context_save() and context_restore() eat two doublewords from the stack. |
| 44 | * First for pop of the saved register, second during ret instruction. |
44 | * First for pop of the saved register, second during ret instruction. |
| 45 | * |
45 | * |
| 46 | * One item is put onto stack to support get_stack_base(). |
46 | * One item is put onto stack to support get_stack_base(). |
| 47 | */ |
47 | */ |
| 48 | #define SP_DELTA (8+STACK_ITEM_SIZE) |
48 | #define SP_DELTA (8+STACK_ITEM_SIZE) |
| 49 | 49 | ||
| 50 | /* |
50 | /* |
| 51 | * Only save registers that must be preserved across |
51 | * Only save registers that must be preserved across |
| 52 | * function calls. |
52 | * function calls. |
| 53 | */ |
53 | */ |
| 54 | struct context { |
54 | struct context { |
| 55 | uintptr_t sp; |
55 | uintptr_t sp; |
| 56 | uintptr_t pc; |
56 | uintptr_t pc; |
| 57 | uint32_t ebx; |
57 | uint32_t ebx; |
| 58 | uint32_t esi; |
58 | uint32_t esi; |
| 59 | uint32_t edi; |
59 | uint32_t edi; |
| 60 | uint32_t ebp; |
60 | uint32_t ebp; |
| 61 | ipl_t ipl; |
61 | ipl_t ipl; |
| 62 | } __attribute__ ((packed)); |
62 | } __attribute__ ((packed)); |
| 63 | 63 | ||
| 64 | #endif |
64 | #endif |
| 65 | 65 | ||
| 66 | /** @} |
66 | /** @} |
| 67 | */ |
67 | */ |
| 68 | 68 | ||