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 <linux/unistd.h>
  15 #include <string.h>
  16 #include <sys/types.h>
  17 #include <stdint.h>
  18 #ifdef powerpc
  19 #define __KERNEL__      /* Ugly hack : atomic.h is broken */
  20 #endif
  21 #include <asm/atomic.h>
  22 #include "ltt/ltt-usertrace-ppc.h"
  23 #ifdef powerpc
  24 #undef __KERNEL__       /* Ugly hack : atomic.h is broken */
  25 #endif
  26
  27 #ifndef min
  28 #define min(a,b) ((a)<(b)?(a):(b))
  29 #endif
  30
  31 #ifdef i386
  32 #define __NR_ltt_trace_generic  311
  33 #define __NR_ltt_register_generic       312
  34 #undef NR_syscalls
  35 #define NR_syscalls 313
  36 #endif
  37
  38 #ifdef powerpc
  39 #define __NR_ltt_trace_generic  283
  40 #define __NR_ltt_register_generic       284
  41 #undef NR_syscalls
  42 #define NR_syscalls 285
  43 #endif
  44
  45 //FIXME : setup for ARM
  46 //FIXME : setup for MIPS
  47
  48 #ifndef _LIBC
  49 // Put in bits/syscall.h
  50 #define SYS_ltt_trace_generic   __NR_ltt_trace_generic
  51 #define SYS_ltt_register_generic        __NR_ltt_register_generic
  52 #endif
  53
  54 #define FACNAME_LEN 32
  55
  56 /* LTT userspace tracing is non blocking by default when buffers are full */
  57 #ifndef LTT_BLOCKING
  58 #define LTT_BLOCKING 0
  59 #endif //LTT_BLOCKING
  60
  61 typedef unsigned int ltt_facility_t;
  62
  63 struct user_facility_info {
  64   char name[FACNAME_LEN];
  65   unsigned int num_events;
  66   size_t alignment;
  67   uint32_t checksum;
  68   size_t int_size;
  69   size_t long_size;
  70   size_t pointer_size;
  71   size_t size_t_size;
  72 };
  73
  74 static inline __attribute__((no_instrument_function))
  75 _syscall5(int, ltt_trace_generic, unsigned int, facility_id,
  76         unsigned int, event_id, void *, data, size_t, data_size, int, blocking)
  77 static inline __attribute__((no_instrument_function))
  78 _syscall2(int, ltt_register_generic, unsigned int *, facility_id,
  79         const struct user_facility_info *, info)
  80
  81 #ifndef LTT_PACK
  82 /* Calculate the offset needed to align the type */
  83 static inline unsigned int __attribute__((no_instrument_function))
  84                                                                                                                 ltt_align(size_t align_drift,
  85                                       size_t size_of_type)
  86 {
  87   size_t alignment = min(sizeof(void*), size_of_type);
  88
  89   return ((alignment - align_drift) & (alignment-1));
  90 }
  91 #define LTT_ALIGN
  92 #else
  93 static inline unsigned int __attribute__((no_instrument_function))
  94                                                                                                                 ltt_align(size_t align_drift,
  95                                       size_t size_of_type)
  96 {
  97   return 0;
  98 }
  99 #define LTT_ALIGN __attribute__((packed))
 100 #endif //LTT_PACK
 101
 102 #ifdef LTT_TRACE_FAST
 103 #include <ltt/ltt-usertrace-fast.h>
 104 #endif //LTT_TRACE_FAST
 105
 106 #endif //_LTT_USERTRACE_H
 107
 108