probes/trap-trace.c

   1 /*
   2  * ltt/probes/trap-trace.c
   3  *
   4  * Trap 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/trap.h>
  12
  13 #include "../ltt-type-serializer.h"
  14
  15 /* kernel_trap_entry specialized tracepoint probe */
  16
  17 void probe_trap_entry(void *_data, struct pt_regs *regs, long id);
  18
  19 DEFINE_MARKER_TP(kernel, trap_entry, trap_entry,
  20         probe_trap_entry, "ip #p%ld trap_id #2u%u");
  21
  22 notrace void probe_trap_entry(void *_data, struct pt_regs *regs, long id)
  23 {
  24         struct marker *marker;
  25         struct serialize_long_short data;
  26
  27         if (likely(regs))
  28                 data.f1 = instruction_pointer(regs);
  29         else
  30                 data.f1 = 0UL;
  31         data.f2 = (unsigned short)id;
  32
  33         marker = &GET_MARKER(kernel, trap_entry);
  34         ltt_specialized_trace(marker, marker->single.probe_private,
  35                 &data, serialize_sizeof(data), sizeof(long));
  36 }
  37
  38 /* kernel_syscall_exit specialized tracepoint probe */
  39
  40 void probe_trap_exit(void *_data);
  41
  42 DEFINE_MARKER_TP(kernel, trap_exit, trap_exit,
  43         probe_trap_exit, MARK_NOARGS);
  44
  45 notrace void probe_trap_exit(void *_data)
  46 {
  47         struct marker *marker;
  48
  49         marker = &GET_MARKER(kernel, trap_exit);
  50         ltt_specialized_trace(marker, marker->single.probe_private,
  51                 NULL, 0, 0);
  52 }
  53
  54 MODULE_LICENSE("GPL and additional rights");
  55 MODULE_AUTHOR("Mathieu Desnoyers");
  56 MODULE_DESCRIPTION("Trap Tracepoint Probes");