#include <stdio.h>
#include <sys/utsname.h>
#include <asm/unistd.h>
#include <errno.h>

#define __sys2(x) #x
#define __sys1(x) __sys2(x)

#ifndef __syscall
#define __syscall(name) "swi\t" __sys1(__NR_##name) "\n\t"
#endif


#define syscall1(type,name,type1,arg1)                                 \
type name(type1 arg1) {                                                 \
  long __res;                                                           \
  __asm__ __volatile__ (                                                \
  "mov\tr0,%1\n\t"                                                      \
  __syscall(uname)                                                       \
  "mov %0,r0"                                                           \
        : "=r" (__res)                                                  \
        : "r" ((long)(arg1))                                            \
        : "r0","lr");                                                   \
  __syscall_return(type,__res);                                         \
}


static inline syscall1(int, my_uname, struct utsname *, utsn);

int main()
{
  struct utsname utsn;
  int ret = my_uname(&utsn);
  printf("%s\n", utsn.sysname);
}