aboutsummaryrefslogtreecommitdiff
path: root/include/linux/unwind.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/unwind.h')
-rw-r--r--include/linux/unwind.h127
1 files changed, 127 insertions, 0 deletions
diff --git a/include/linux/unwind.h b/include/linux/unwind.h
new file mode 100644
index 00000000000..ce48e2cd37a
--- /dev/null
+++ b/include/linux/unwind.h
@@ -0,0 +1,127 @@
+#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 */