[PATCH] remove kernel/lockdep.c:lockdep_internal
[usb.git] / include / linux / unwind.h
blob749928c161fb24a6fbdcc95fc703c18d900f9494
1 #ifndef _LINUX_UNWIND_H
2 #define _LINUX_UNWIND_H
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.
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.
15 struct module;
17 #ifdef CONFIG_STACK_UNWIND
19 #include <asm/unwind.h>
21 #ifndef ARCH_UNWIND_SECTION_NAME
22 #define ARCH_UNWIND_SECTION_NAME ".eh_frame"
23 #endif
26 * Initialize unwind support.
28 extern void unwind_init(void);
29 extern void unwind_setup(void);
31 #ifdef CONFIG_MODULES
33 extern void *unwind_add_table(struct module *,
34 const void *table_start,
35 unsigned long table_size);
37 extern void unwind_remove_table(void *handle, int init_only);
39 #endif
41 extern int unwind_init_frame_info(struct unwind_frame_info *,
42 struct task_struct *,
43 /*const*/ struct pt_regs *);
46 * Prepare to unwind a blocked task.
48 extern int unwind_init_blocked(struct unwind_frame_info *,
49 struct task_struct *);
52 * Prepare to unwind the currently running thread.
54 extern int unwind_init_running(struct unwind_frame_info *,
55 asmlinkage int (*callback)(struct unwind_frame_info *,
56 void *arg),
57 void *arg);
60 * Unwind to previous to frame. Returns 0 if successful, negative
61 * number in case of an error.
63 extern int unwind(struct unwind_frame_info *);
66 * Unwind until the return pointer is in user-land (or until an error
67 * occurs). Returns 0 if successful, negative number in case of
68 * error.
70 extern int unwind_to_user(struct unwind_frame_info *);
72 #else
74 struct unwind_frame_info {};
76 static inline void unwind_init(void) {}
77 static inline void unwind_setup(void) {}
79 #ifdef CONFIG_MODULES
81 static inline void *unwind_add_table(struct module *mod,
82 const void *table_start,
83 unsigned long table_size)
85 return NULL;
88 #endif
90 static inline void unwind_remove_table(void *handle, int init_only)
94 static inline int unwind_init_frame_info(struct unwind_frame_info *info,
95 struct task_struct *tsk,
96 const struct pt_regs *regs)
98 return -ENOSYS;
101 static inline int unwind_init_blocked(struct unwind_frame_info *info,
102 struct task_struct *tsk)
104 return -ENOSYS;
107 static inline int unwind_init_running(struct unwind_frame_info *info,
108 asmlinkage int (*cb)(struct unwind_frame_info *,
109 void *arg),
110 void *arg)
112 return -ENOSYS;
115 static inline int unwind(struct unwind_frame_info *info)
117 return -ENOSYS;
120 static inline int unwind_to_user(struct unwind_frame_info *info)
122 return -ENOSYS;
125 #endif
127 #endif /* _LINUX_UNWIND_H */