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#ifndef _LINUX_UNWIND_H
#define _LINUX_UNWIND_H
/*
* Copyright (C) 2002-2006 Novell, Inc.
* Jan Beulich <jbeulich@novell.com>
* This code is released under version 2 of the GNU GPL.
*
* A simple API for unwinding kernel stacks. This is used for
* debugging and error reporting purposes. The kernel doesn't need
* full-blown stack unwinding with all the bells and whistles, so there
* is not much point in implementing the full Dwarf2 unwind API.
*/
struct module;
#ifdef CONFIG_STACK_UNWIND
#include <asm/unwind.h>
#ifndef ARCH_UNWIND_SECTION_NAME
#define ARCH_UNWIND_SECTION_NAME ".eh_frame"
#endif
/*
* Initialize unwind support.
*/
extern void unwind_init(void);
extern void unwind_setup(void);
#ifdef CONFIG_MODULES
extern void *unwind_add_table(struct module *,
const void *table_start,
unsigned long table_size);
extern void unwind_remove_table(void *handle, int init_only);
#endif
extern int unwind_init_frame_info(struct unwind_frame_info *,
struct task_struct *,
/*const*/ struct pt_regs *);
/*
* Prepare to unwind a blocked task.
*/
extern int unwind_init_blocked(struct unwind_frame_info *,
struct task_struct *);
/*
* Prepare to unwind the currently running thread.
*/
extern int unwind_init_running(struct unwind_frame_info *,
asmlinkage int (*callback)(struct unwind_frame_info *,
void *arg),
void *arg);
/*
* Unwind to previous to frame. Returns 0 if successful, negative
* number in case of an error.
*/
extern int unwind(struct unwind_frame_info *);
/*
* Unwind until the return pointer is in user-land (or until an error
* occurs). Returns 0 if successful, negative number in case of
* error.
*/
extern int unwind_to_user(struct unwind_frame_info *);
#else
struct unwind_frame_info {};
static inline void unwind_init(void) {}
static inline void unwind_setup(void) {}
#ifdef CONFIG_MODULES
static inline void *unwind_add_table(struct module *mod,
const void *table_start,
unsigned long table_size)
{
return NULL;
}
#endif
static inline void unwind_remove_table(void *handle, int init_only)
{
}
static inline int unwind_init_frame_info(struct unwind_frame_info *info,
struct task_struct *tsk,
const struct pt_regs *regs)
{
return -ENOSYS;
}
static inline int unwind_init_blocked(struct unwind_frame_info *info,
struct task_struct *tsk)
{
return -ENOSYS;
}
static inline int unwind_init_running(struct unwind_frame_info *info,
asmlinkage int (*cb)(struct unwind_frame_info *,
void *arg),
void *arg)
{
return -ENOSYS;
}
static inline int unwind(struct unwind_frame_info *info)
{
return -ENOSYS;
}
static inline int unwind_to_user(struct unwind_frame_info *info)
{
return -ENOSYS;
}
#endif
#endif /* _LINUX_UNWIND_H */
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