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 <asm/atomic.h>
  16 #include <string.h>
  17 #include <sys/types.h>
  18 #include <stdint.h>
  19
  20 #ifdef LTT_TRACE_FAST
  21 #include <ltt/ltt-usertrace-fast.h>
  22 #endif //LTT_TRACE_FAST
  23
  24 #ifndef min
  25 #define min(a,b) ((a)<(b)?(a):(b))
  26 #endif
  27
  28 //Put in asm-i486/unistd.h
  29 #define __NR_ltt_trace_generic  294
  30 #define __NR_ltt_register_generic       295
  31
  32 #undef NR_syscalls
  33 #define NR_syscalls 296
  34
  35 //FIXME : setup for ARM
  36 //FIXME : setup for MIPS
  37
  38 #ifndef _LIBC
  39 // Put in bits/syscall.h
  40 #define SYS_ltt_trace_generic   __NR_ltt_trace_generic
  41 #define SYS_ltt_register_generic        __NR_ltt_register_generic
  42 #endif
  43
  44 #define FACNAME_LEN 32
  45
  46 /* LTT userspace tracing is non blocking by default when buffers are full */
  47 #ifndef LTT_BLOCKING
  48 #define LTT_BLOCKING 0
  49 #endif //LTT_BLOCKING
  50
  51 typedef unsigned int ltt_facility_t;
  52
  53 struct user_facility_info {
  54   char name[FACNAME_LEN];
  55   unsigned int num_events;
  56   size_t alignment;
  57   uint32_t checksum;
  58   size_t int_size;
  59   size_t long_size;
  60   size_t pointer_size;
  61   size_t size_t_size;
  62 };
  63
  64 static inline __attribute__((no_instrument_function))
  65 _syscall5(int, ltt_trace_generic, unsigned int, facility_id,
  66         unsigned int, event_id, void *, data, size_t, data_size, int, blocking)
  67 static inline __attribute__((no_instrument_function))
  68 _syscall2(int, ltt_register_generic, unsigned int *, facility_id,
  69         const struct user_facility_info *, info)
  70
  71 #ifndef LTT_PACK
  72 /* Calculate the offset needed to align the type */
  73 static inline unsigned int __attribute__((no_instrument_function))
  74                                                                                                                 ltt_align(size_t align_drift,
  75                                       size_t size_of_type)
  76 {
  77   size_t alignment = min(sizeof(void*), size_of_type);
  78
  79   return ((alignment - align_drift) & (alignment-1));
  80 }
  81 #define LTT_ALIGN
  82 #else
  83 static inline unsigned int __attribute__((no_instrument_function))
  84                                                                                                                 ltt_align(size_t align_drift,
  85                                       size_t size_of_type)
  86 {
  87   return 0;
  88 }
  89 #define LTT_ALIGN __attribute__((packed))
  90 #endif //LTT_PACK
  91
  92 #endif //_LTT_USERTRACE_H
  93
  94