4552d5dc08
These are the generic bits needed to enable reliable stack traces based on Dwarf2-like (.eh_frame) unwind information. Subsequent patches will enable x86-64 and i386 to make use of this. Thanks to Andi Kleen and Ingo Molnar, who pointed out several possibilities for improvement. Signed-off-by: Jan Beulich <jbeulich@novell.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
#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.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
|
|
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_add_table(struct module *,
|
|
const void *table_start,
|
|
unsigned long table_size);
|
|
|
|
extern void unwind_remove_table(void *handle, int init_only);
|
|
|
|
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 void (*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_add_table(struct module *mod,
|
|
const void *table_start,
|
|
unsigned long table_size)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
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 void (*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 */
|