#ifndef _TRACE_SYSCALL_H
  #define _TRACE_SYSCALL_H

  #include <linux/tracepoint.h>

  #include <linux/unistd.h>
  #include <linux/ftrace_event.h>

  #include <asm/ptrace.h>

  /*
   * A syscall entry in the ftrace syscalls array.
   *
   * @name: name of the syscall

   * @syscall_nr: number of the syscall

   * @nb_args: number of parameters it takes
   * @types: list of types as strings
   * @args: list of args as strings (args[i] matches types[i])

   * @enter_event: associated syscall_enter trace event
   * @exit_event: associated syscall_exit trace event

   */
  struct syscall_metadata {
  	const char	*name;

  	int		syscall_nr;

  	int		nb_args;
  	const char	**types;
  	const char	**args;

  	struct list_head enter_fields;

  
  	struct ftrace_event_call *enter_event;
  	struct ftrace_event_call *exit_event;

  };
  
  #ifdef CONFIG_FTRACE_SYSCALLS

  extern unsigned long arch_syscall_addr(int nr);

  extern int init_syscall_trace(struct ftrace_event_call *call);

  extern int reg_event_syscall_enter(struct ftrace_event_call *call);
  extern void unreg_event_syscall_enter(struct ftrace_event_call *call);
  extern int reg_event_syscall_exit(struct ftrace_event_call *call);
  extern void unreg_event_syscall_exit(struct ftrace_event_call *call);
  extern int
  ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s);

  enum print_line_t print_syscall_enter(struct trace_iterator *iter, int flags,
  				      struct trace_event *event);
  enum print_line_t print_syscall_exit(struct trace_iterator *iter, int flags,
  				     struct trace_event *event);

  #endif

  
  #ifdef CONFIG_PERF_EVENTS

  int perf_sysenter_enable(struct ftrace_event_call *call);
  void perf_sysenter_disable(struct ftrace_event_call *call);
  int perf_sysexit_enable(struct ftrace_event_call *call);
  void perf_sysexit_disable(struct ftrace_event_call *call);

  #endif

  
  #endif /* _TRACE_SYSCALL_H */