lttng-compat-syscalls.c

   1 /*
   2  * lttng-compat-syscalls.c
   3  *
   4  * Copyright 2010-2011 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  *
   6  * LTTng compat syscall probes.
   7  *
   8  * Dual LGPL v2.1/GPL v2 license.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/slab.h>
  13 #include <linux/compat.h>
  14 #include <asm/ptrace.h>
  15 #include <asm/syscall.h>
  16
  17 #include "ltt-events.h"
  18
  19 extern
  20 void syscall_entry_probe(void *__data, struct pt_regs *regs, long id);
  21
  22 /*
  23  * Take care of NOARGS not supported by mainline.
  24  */
  25 #define DECLARE_EVENT_CLASS_NOARGS(name, tstruct, assign, print)
  26 #define DEFINE_EVENT_NOARGS(template, name)
  27 #define TRACE_EVENT_NOARGS(name, struct, assign, print)
  28
  29 /*
  30  * Create LTTng tracepoint probes.
  31  */
  32 #define LTTNG_PACKAGE_BUILD
  33 #define CREATE_TRACE_POINTS
  34 #define TP_MODULE_OVERRIDE
  35 #define TRACE_INCLUDE_PATH ../instrumentation/syscalls/headers
  36
  37 /* Hijack probe callback for system calls */
  38 #define TP_PROBE_CB(_template)          &syscall_entry_probe
  39 #include "instrumentation/syscalls/headers/compat_syscalls_integers.h"
  40 #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h"
  41 #undef TP_PROBE_CB
  42
  43 #undef TP_MODULE_OVERRIDE
  44 #undef LTTNG_PACKAGE_BUILD
  45 #undef CREATE_TRACE_POINTS
  46
  47 #undef TRACE_SYSCALL_TABLE
  48 #define TRACE_SYSCALL_TABLE(_template, _name, _nr, _nrargs)     \
  49         [ _nr ] = {                                             \
  50                 .func = __event_probe__##_template,             \
  51                 .nrargs = (_nrargs),                            \
  52                 .fields = __event_fields___##_template,         \
  53                 .desc = &__event_desc___##_name,                \
  54         },
  55
  56 #define CREATE_SYSCALL_TABLE
  57
  58 /* Create compatibility syscall table */
  59 const struct trace_syscall_entry compat_sc_table[] = {
  60 #include "instrumentation/syscalls/headers/compat_syscalls_integers.h"
  61 #include "instrumentation/syscalls/headers/compat_syscalls_pointers.h"
  62 };
  63 const size_t compat_sc_table_len = ARRAY_SIZE(compat_sc_table);
  64
  65 #undef CREATE_SYSCALL_TABLE