libc/sysdeps/linux/metag/syscall.c

   1 /* syscall for META/uClibc
   2  *
   3  * Copyright (C) 2013 Imagination Technologies
   4  *
   5  * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
   6  */
   7
   8 #include <features.h>
   9 #include <errno.h>
  10 #include <sys/types.h>
  11 #include <sys/syscall.h>
  12
  13 long syscall(long sysnum,
  14              long arg1, long arg2, long arg3,
  15              long arg4, long arg5, long arg6)
  16 {
  17
  18         register long __call __asm__ ("D1Re0") = sysnum;
  19         register long __res __asm__ ("D0Re0");
  20         register long __a __asm__ ("D1Ar1") = arg1;
  21         register long __b __asm__ ("D0Ar2") = arg2;
  22         register long __c __asm__ ("D1Ar3") = arg3;
  23         register long __d __asm__ ("D0Ar4") = arg4;
  24         register long __e __asm__ ("D1Ar5") = arg5;
  25         register long __f __asm__ ("D0Ar6") = arg6;
  26
  27
  28         __asm__ __volatile__ ("SWITCH  #0x440001"
  29                               : "=d" (__res)
  30                               : "d" (__call), "d" (__a), "d" (__b),
  31                                 "d" (__c), "d" (__d), "d" (__e) , "d" (__f)
  32                               : "memory");
  33
  34         if(__res >= (unsigned long) -4095) {
  35                 long err = __res;
  36                 (*__errno_location()) = (-err);
  37                 __res = (unsigned long) -1;
  38         }
  39         return (long) __res;
  40 }