ltt-usertrace/ltt/ltt-usertrace.h

   1 /*****************************************************************************
   2  * ltt-usertrace.h
   3  *
   4  * LTT userspace tracing header
   5  *
   6  * Mathieu Desnoyers, March 2006
   7  */
   8
   9 #ifndef _LTT_USERTRACE_H
  10 #define _LTT_USERTRACE_H
  11
  12 #include <errno.h>
  13 #include <syscall.h>
  14 #include <string.h>
  15 #include <stdint.h>
  16 #include <sys/types.h>
  17 #include <linux/unistd.h>
  18
  19 #ifndef min
  20 #define min(a,b) ((a)<(b)?(a):(b))
  21 #endif
  22
  23 #ifdef i386
  24 #define __NR_ltt_trace_generic  311
  25 #define __NR_ltt_register_generic       312
  26 #undef NR_syscalls
  27 #define NR_syscalls 313
  28 #endif
  29
  30 #ifdef powerpc
  31 #define __NR_ltt_trace_generic  283
  32 #define __NR_ltt_register_generic       284
  33 #undef NR_syscalls
  34 #define NR_syscalls 285
  35 #endif
  36
  37 //FIXME : setup for ARM
  38 //FIXME : setup for MIPS
  39
  40 #ifndef _LIBC
  41 // Put in bits/syscall.h
  42 #define SYS_ltt_trace_generic   __NR_ltt_trace_generic
  43 #define SYS_ltt_register_generic        __NR_ltt_register_generic
  44 #endif
  45
  46 #define FACNAME_LEN 32
  47
  48 /* LTT userspace tracing is non blocking by default when buffers are full */
  49 #ifndef LTT_BLOCKING
  50 #define LTT_BLOCKING 0
  51 #endif //LTT_BLOCKING
  52
  53 typedef unsigned int ltt_facility_t;
  54
  55 struct user_facility_info {
  56   char name[FACNAME_LEN];
  57   unsigned int num_events;
  58   size_t alignment;
  59   uint32_t checksum;
  60   size_t int_size;
  61   size_t long_size;
  62   size_t pointer_size;
  63   size_t size_t_size;
  64 };
  65
  66 static inline __attribute__((no_instrument_function))
  67 _syscall5(int, ltt_trace_generic, unsigned int, facility_id,
  68         unsigned int, event_id, void *, data, size_t, data_size, int, blocking)
  69 static inline __attribute__((no_instrument_function))
  70 _syscall2(int, ltt_register_generic, unsigned int *, facility_id,
  71         const struct user_facility_info *, info)
  72
  73 #ifndef LTT_PACK
  74 /* Calculate the offset needed to align the type */
  75 static inline unsigned int __attribute__((no_instrument_function))
  76                                                                                                                 ltt_align(size_t align_drift,
  77                                       size_t size_of_type)
  78 {
  79   size_t alignment = min(sizeof(void*), size_of_type);
  80
  81   return ((alignment - align_drift) & (alignment-1));
  82 }
  83 #define LTT_ALIGN
  84 #else
  85 static inline unsigned int __attribute__((no_instrument_function))
  86                                                                                                                 ltt_align(size_t align_drift,
  87                                       size_t size_of_type)
  88 {
  89   return 0;
  90 }
  91 #define LTT_ALIGN __attribute__((packed))
  92 #endif //LTT_PACK
  93
  94 #ifdef LTT_TRACE_FAST
  95 #include <ltt/ltt-usertrace-fast.h>
  96 #endif //LTT_TRACE_FAST
  97
  98 #endif //_LTT_USERTRACE_H
  99
 100