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 #if defined(__powerpc__) || defined(__powerpc64__)
  19 #include "ltt/ltt-usertrace-ppc.h"
  20 #else
  21 #include <asm/atomic.h>
  22 #endif
  23
  24 #ifndef min
  25 #define min(a,b) ((a)<(b)?(a):(b))
  26 #endif
  27
  28 #ifdef i386
  29 #define __NR_ltt_trace_generic  311
  30 #define __NR_ltt_register_generic       312
  31 #undef NR_syscalls
  32 #define NR_syscalls 313
  33 #endif
  34
  35 #ifdef powerpc
  36 #define __NR_ltt_trace_generic  283
  37 #define __NR_ltt_register_generic       284
  38 #undef NR_syscalls
  39 #define NR_syscalls 285
  40 #endif
  41
  42 //FIXME : setup for ARM
  43 //FIXME : setup for MIPS
  44
  45 #ifndef _LIBC
  46 // Put in bits/syscall.h
  47 #define SYS_ltt_trace_generic   __NR_ltt_trace_generic
  48 #define SYS_ltt_register_generic        __NR_ltt_register_generic
  49 #endif
  50
  51 #define FACNAME_LEN 32
  52
  53 /* LTT userspace tracing is non blocking by default when buffers are full */
  54 #ifndef LTT_BLOCKING
  55 #define LTT_BLOCKING 0
  56 #endif //LTT_BLOCKING
  57
  58 typedef unsigned int ltt_facility_t;
  59
  60 struct user_facility_info {
  61   char name[FACNAME_LEN];
  62   unsigned int num_events;
  63   size_t alignment;
  64   uint32_t checksum;
  65   size_t int_size;
  66   size_t long_size;
  67   size_t pointer_size;
  68   size_t size_t_size;
  69 };
  70
  71 static inline __attribute__((no_instrument_function))
  72 _syscall5(int, ltt_trace_generic, unsigned int, facility_id,
  73         unsigned int, event_id, void *, data, size_t, data_size, int, blocking)
  74 static inline __attribute__((no_instrument_function))
  75 _syscall2(int, ltt_register_generic, unsigned int *, facility_id,
  76         const struct user_facility_info *, info)
  77
  78 #ifndef LTT_PACK
  79 /* Calculate the offset needed to align the type */
  80 static inline unsigned int __attribute__((no_instrument_function))
  81                                                                                                                 ltt_align(size_t align_drift,
  82                                       size_t size_of_type)
  83 {
  84   size_t alignment = min(sizeof(void*), size_of_type);
  85
  86   return ((alignment - align_drift) & (alignment-1));
  87 }
  88 #define LTT_ALIGN
  89 #else
  90 static inline unsigned int __attribute__((no_instrument_function))
  91                                                                                                                 ltt_align(size_t align_drift,
  92                                       size_t size_of_type)
  93 {
  94   return 0;
  95 }
  96 #define LTT_ALIGN __attribute__((packed))
  97 #endif //LTT_PACK
  98
  99 #ifdef LTT_TRACE_FAST
 100 #include <ltt/ltt-usertrace-fast.h>
 101 #endif //LTT_TRACE_FAST
 102
 103 #endif //_LTT_USERTRACE_H
 104
 105