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1 | #ifndef _LINUX_UNWIND_H |
2 | #define _LINUX_UNWIND_H | |
3 | ||
4 | /* | |
5 | * Copyright (C) 2002-2006 Novell, Inc. | |
6 | * Jan Beulich <jbeulich@novell.com> | |
7 | * This code is released under version 2 of the GNU GPL. | |
8 | * | |
9 | * A simple API for unwinding kernel stacks. This is used for | |
10 | * debugging and error reporting purposes. The kernel doesn't need | |
11 | * full-blown stack unwinding with all the bells and whistles, so there | |
12 | * is not much point in implementing the full Dwarf2 unwind API. | |
13 | */ | |
14 | ||
15 | #include <linux/config.h> | |
16 | ||
17 | struct module; | |
18 | ||
19 | #ifdef CONFIG_STACK_UNWIND | |
20 | ||
21 | #include <asm/unwind.h> | |
22 | ||
23 | #ifndef ARCH_UNWIND_SECTION_NAME | |
24 | #define ARCH_UNWIND_SECTION_NAME ".eh_frame" | |
25 | #endif | |
26 | ||
27 | /* | |
28 | * Initialize unwind support. | |
29 | */ | |
30 | extern void unwind_init(void); | |
31 | ||
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32 | #ifdef CONFIG_MODULES |
33 | ||
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34 | extern void *unwind_add_table(struct module *, |
35 | const void *table_start, | |
36 | unsigned long table_size); | |
37 | ||
38 | extern void unwind_remove_table(void *handle, int init_only); | |
39 | ||
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40 | #endif |
41 | ||
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42 | extern int unwind_init_frame_info(struct unwind_frame_info *, |
43 | struct task_struct *, | |
44 | /*const*/ struct pt_regs *); | |
45 | ||
46 | /* | |
47 | * Prepare to unwind a blocked task. | |
48 | */ | |
49 | extern int unwind_init_blocked(struct unwind_frame_info *, | |
50 | struct task_struct *); | |
51 | ||
52 | /* | |
53 | * Prepare to unwind the currently running thread. | |
54 | */ | |
55 | extern int unwind_init_running(struct unwind_frame_info *, | |
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56 | asmlinkage int (*callback)(struct unwind_frame_info *, |
57 | void *arg), | |
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58 | void *arg); |
59 | ||
60 | /* | |
61 | * Unwind to previous to frame. Returns 0 if successful, negative | |
62 | * number in case of an error. | |
63 | */ | |
64 | extern int unwind(struct unwind_frame_info *); | |
65 | ||
66 | /* | |
67 | * Unwind until the return pointer is in user-land (or until an error | |
68 | * occurs). Returns 0 if successful, negative number in case of | |
69 | * error. | |
70 | */ | |
71 | extern int unwind_to_user(struct unwind_frame_info *); | |
72 | ||
73 | #else | |
74 | ||
75 | struct unwind_frame_info {}; | |
76 | ||
77 | static inline void unwind_init(void) {} | |
78 | ||
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79 | #ifdef CONFIG_MODULES |
80 | ||
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81 | static inline void *unwind_add_table(struct module *mod, |
82 | const void *table_start, | |
83 | unsigned long table_size) | |
84 | { | |
85 | return NULL; | |
86 | } | |
87 | ||
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88 | #endif |
89 | ||
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90 | static inline void unwind_remove_table(void *handle, int init_only) |
91 | { | |
92 | } | |
93 | ||
94 | static inline int unwind_init_frame_info(struct unwind_frame_info *info, | |
95 | struct task_struct *tsk, | |
96 | const struct pt_regs *regs) | |
97 | { | |
98 | return -ENOSYS; | |
99 | } | |
100 | ||
101 | static inline int unwind_init_blocked(struct unwind_frame_info *info, | |
102 | struct task_struct *tsk) | |
103 | { | |
104 | return -ENOSYS; | |
105 | } | |
106 | ||
107 | static inline int unwind_init_running(struct unwind_frame_info *info, | |
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108 | asmlinkage int (*cb)(struct unwind_frame_info *, |
109 | void *arg), | |
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110 | void *arg) |
111 | { | |
112 | return -ENOSYS; | |
113 | } | |
114 | ||
115 | static inline int unwind(struct unwind_frame_info *info) | |
116 | { | |
117 | return -ENOSYS; | |
118 | } | |
119 | ||
120 | static inline int unwind_to_user(struct unwind_frame_info *info) | |
121 | { | |
122 | return -ENOSYS; | |
123 | } | |
124 | ||
125 | #endif | |
126 | ||
127 | #endif /* _LINUX_UNWIND_H */ |