klibc/klibc/arch/s390x/include/klibc/archsys.h

   1 /*
   2  * arch/s390x/include/klibc/archsys.h
   3  *
   4  * Architecture-specific syscall definitions
   5  */
   6
   7 #ifndef _KLIBC_ARCHSYS_H
   8 #define _KLIBC_ARCHSYS_H
   9
  10 /* S/390X only has five syscall parameters, and uses a structure for
  11    6-argument syscalls. */
  12
  13 #ifndef _syscall6
  14
  15 #define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,\
  16                   type4,arg4,type5,arg5,type6,arg6)          \
  17 type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4,    \
  18           type5 arg5, type6 arg6) {                          \
  19         unsigned long  __arg[6] = {                          \
  20                 (unsigned long) arg1,                        \
  21                 (unsigned long) arg2,                        \
  22                 (unsigned long) arg3,                        \
  23                 (unsigned long) arg4,                        \
  24                 (unsigned long) arg5,                        \
  25                 (unsigned long) arg6                         \
  26         };                                                   \
  27         register void *__argp asm("2") = &__arg;             \
  28         long __res;                                          \
  29         __asm__ __volatile__ (                               \
  30                 "    svc %b1\n"                              \
  31                 "    lgr  %0,2"                              \
  32                 : "=d" (__res)                               \
  33                 : "i" (__NR_##name),                         \
  34                   "d" (__argp)                               \
  35                 : _svc_clobber);                             \
  36         __syscall_return(type, __res);                       \
  37 }
  38
  39 #endif /* _syscall6() missing */
  40
  41 #endif /* _KLIBC_ARCHSYS_H */