probes/syscall-trace.c

   1 /*
   2  * ltt/probes/syscall-trace.c
   3  *
   4  * System call tracepoint probes.
   5  *
   6  * (C) Copyright 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
   7  * Dual LGPL v2.1/GPL v2 license.
   8  */
   9
  10 #include <linux/module.h>
  11 #include <trace/syscall.h>
  12
  13 #include "../ltt-type-serializer.h"
  14
  15
  16 /* kernel_syscall_entry specialized tracepoint probe */
  17
  18 void probe_syscall_entry(void *_data, struct pt_regs *regs, long id);
  19
  20 DEFINE_MARKER_TP(kernel, syscall_entry, syscall_entry,
  21         probe_syscall_entry, "ip #p%ld syscall_id #2u%u");
  22
  23 notrace void probe_syscall_entry(void *_data, struct pt_regs *regs, long id)
  24 {
  25         struct marker *marker;
  26         struct serialize_long_short data;
  27
  28         data.f1 = instruction_pointer(regs);
  29         data.f2 = (unsigned short)id;
  30
  31         marker = &GET_MARKER(kernel, syscall_entry);
  32         ltt_specialized_trace(marker, marker->single.probe_private,
  33                 &data, serialize_sizeof(data), sizeof(long));
  34 }
  35
  36 /* kernel_syscall_exit specialized tracepoint probe */
  37
  38 void probe_syscall_exit(void *_data, long ret);
  39
  40 DEFINE_MARKER_TP(kernel, syscall_exit, syscall_exit,
  41         probe_syscall_exit, "ret %ld");
  42
  43 notrace void probe_syscall_exit(void *_data, long ret)
  44 {
  45         struct marker *marker;
  46
  47         marker = &GET_MARKER(kernel, syscall_exit);
  48         ltt_specialized_trace(marker, marker->single.probe_private,
  49                 &ret, sizeof(ret), sizeof(ret));
  50 }
  51
  52 MODULE_LICENSE("GPL and additional rights");
  53 MODULE_AUTHOR("Mathieu Desnoyers");
  54 MODULE_DESCRIPTION("syscall Tracepoint Probes");