markers-userspace/kernel-api.h

   1 /*
   2  * Kernel API extracted from Linux kernel headers.
   3  */
   4
   5 #ifndef __KERNEL_API
   6 #define __KERNEL_API
   7
   8 #include <errno.h>
   9 #include <syscall.h>
  10 #include <string.h>
  11 #include <stdint.h>
  12
  13 #ifdef __cplusplus
  14 extern "C" {
  15 #endif
  16
  17 #define DECLARE_IMV(type, name) extern __typeof__(type) name##__imv
  18 #define DEFINE_IMV(type, name)  __typeof__(type) name##__imv
  19
  20 #define likely(x)       __builtin_expect(!!(x), 1)
  21 #define unlikely(x)     __builtin_expect(!!(x), 0)
  22
  23 /**
  24  * imv_read - read immediate variable
  25  * @name: immediate value name
  26  *
  27  * Reads the value of @name.
  28  */
  29 #define imv_read(name)                  _imv_read(name)
  30
  31 /**
  32  * _imv_read - Read immediate value with standard memory load.
  33  * @name: immediate value name
  34  *
  35  * Force a data read of the immediate value instead of the immediate value
  36  * based mechanism. Useful for __init and __exit section data read.
  37  */
  38 #define _imv_read(name)         (name##__imv)
  39
  40 #ifdef __i386__
  41 #define __NR_marker             333
  42 #define __NR_trace              334
  43 #elif defined(__x86_64__)
  44 #define __NR_marker             295
  45 #define __NR_trace              296
  46 #else
  47 #error "Unsupported architecture for userspace markers"
  48 #endif
  49
  50 #define sys_marker(...) syscall(__NR_marker, __VA_ARGS__)
  51 #define sys_trace(...) syscall(__NR_trace, __VA_ARGS__)
  52
  53 #ifdef __cplusplus
  54 } /* end of extern "C" */
  55 #endif
  56
  57 #endif