usertrace-generic/ltt/ltt-generic.h

   1 /*****************************************************************************
   2  * ltt-generic.h
   3  *
   4  * LTT generic userspace tracing header
   5  *
   6  * Mathieu Desnoyers, March 2006
   7  */
   8
   9 #ifndef _LTT_GENERIC_H
  10 #define _LTT_GENERIC_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 #ifndef min
  21 #define min(a,b) ((a)<(b)?(a):(b))
  22 #endif
  23
  24 //Put in asm-i486/unistd.h
  25 #define __NR_ltt_trace_generic  294
  26 #define __NR_ltt_register_generic       295
  27
  28 #undef NR_syscalls
  29 #define NR_syscalls 296
  30
  31 //FIXME : setup for ARM
  32 //FIXME : setup for MIPS
  33
  34 #ifndef _LIBC
  35 // Put in bits/syscall.h
  36 #define SYS_ltt_trace_generic   __NR_ltt_trace_generic
  37 #define SYS_ltt_register_generic        __NR_ltt_register_generic
  38 #endif
  39
  40 #define FACNAME_LEN 32
  41
  42 /* LTT userspace tracing is non blocking by default when buffers are full */
  43 #ifndef LTT_BLOCKING
  44 #define LTT_BLOCKING 0
  45 #endif //LTT_BLOCKING
  46
  47 typedef unsigned int ltt_facility_t;
  48
  49 struct user_facility_info {
  50   char name[FACNAME_LEN];
  51   unsigned int num_events;
  52   size_t alignment;
  53   uint32_t checksum;
  54   size_t int_size;
  55   size_t long_size;
  56   size_t pointer_size;
  57   size_t size_t_size;
  58 };
  59
  60 static inline _syscall5(int, ltt_trace_generic, unsigned int, facility_id,
  61                 unsigned int, event_id, void *, data, size_t, data_size, int, blocking)
  62 static inline _syscall2(int, ltt_register_generic, unsigned int *, facility_id, const struct user_facility_info *, info)
  63
  64 #ifndef LTT_PACK
  65 /* Calculate the offset needed to align the type */
  66 static inline unsigned int ltt_align(size_t align_drift,
  67                                      size_t size_of_type)
  68 {
  69   size_t alignment = min(sizeof(void*), size_of_type);
  70
  71   return ((alignment - align_drift) & (alignment-1));
  72 }
  73 #else
  74 static inline unsigned int ltt_align(size_t align_drift,
  75                                      size_t size_of_type)
  76 {
  77   return 0;
  78 }
  79 #endif //LTT_PACK
  80
  81 #endif //_LTT_GENERIC_H
  82
  83