#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); #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) {} #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 */