include/trace/syscall.h

   1 #ifndef _TRACE_SYSCALL_H
   2 #define _TRACE_SYSCALL_H
   3
   4 #include <linux/tracepoint.h>
   5 #include <linux/unistd.h>
   6 #include <linux/ftrace_event.h>
   7 #include <linux/thread_info.h>
   8
   9 #include <asm/ptrace.h>
  10
  11
  12 /*
  13  * A syscall entry in the ftrace syscalls array.
  14  *
  15  * @name: name of the syscall
  16  * @syscall_nr: number of the syscall
  17  * @nb_args: number of parameters it takes
  18  * @types: list of types as strings
  19  * @args: list of args as strings (args[i] matches types[i])
  20  * @enter_event: associated syscall_enter trace event
  21  * @exit_event: associated syscall_exit trace event
  22  */
  23 struct syscall_metadata {
  24         const char      *name;
  25         int             syscall_nr;
  26         int             nb_args;
  27         const char      **types;
  28         const char      **args;
  29         struct list_head enter_fields;
  30
  31         struct ftrace_event_call *enter_event;
  32         struct ftrace_event_call *exit_event;
  33 };
  34
  35 #ifdef CONFIG_FTRACE_SYSCALLS
  36 extern unsigned long arch_syscall_addr(int nr);
  37 extern int init_syscall_trace(struct ftrace_event_call *call);
  38
  39 extern int reg_event_syscall_enter(struct ftrace_event_call *call);
  40 extern void unreg_event_syscall_enter(struct ftrace_event_call *call);
  41 extern int reg_event_syscall_exit(struct ftrace_event_call *call);
  42 extern void unreg_event_syscall_exit(struct ftrace_event_call *call);
  43 extern int
  44 ftrace_format_syscall(struct ftrace_event_call *call, struct trace_seq *s);
  45 enum print_line_t print_syscall_enter(struct trace_iterator *iter, int flags,
  46                                       struct trace_event *event);
  47 enum print_line_t print_syscall_exit(struct trace_iterator *iter, int flags,
  48                                      struct trace_event *event);
  49 #endif
  50
  51 #ifdef CONFIG_PERF_EVENTS
  52 int perf_sysenter_enable(struct ftrace_event_call *call);
  53 void perf_sysenter_disable(struct ftrace_event_call *call);
  54 int perf_sysexit_enable(struct ftrace_event_call *call);
  55 void perf_sysexit_disable(struct ftrace_event_call *call);
  56 #endif
  57
  58 #if defined(CONFIG_TRACEPOINTS) && defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
  59 static inline void syscall_tracepoint_update(struct task_struct *p)
  60 {
  61         if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
  62                 set_tsk_thread_flag(p, TIF_SYSCALL_TRACEPOINT);
  63         else
  64                 clear_tsk_thread_flag(p, TIF_SYSCALL_TRACEPOINT);
  65 }
  66 #else
  67 static inline void syscall_tracepoint_update(struct task_struct *p)
  68 {
  69 }
  70 #endif
  71
  72 #endif /* _TRACE_SYSCALL_H */