1  /* OpenRISC helper for the clone syscall.
       2     Copyright (C) 2022-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <stdarg.h>
      20  #include <sysdep.h>
      21  
      22  extern int __or1k_clone (int (*fn)(void *), void *child_stack,
      23  			 int flags, void *arg, pid_t *ptid,
      24  			 void *tls, pid_t *ctid);
      25  
      26  
      27  /* The OpenRISC ABI uses the stack for varargs like those using in clone
      28     but the linux syscall ABI uses registers.
      29     This function moves from varargs to regs.  */
      30  int
      31  __clone (int (*fn)(void *), void *child_stack,
      32  	 int flags, void *arg, ...
      33  	 /* pid_t *ptid, struct user_desc *tls, pid_t *ctid */ )
      34  {
      35    void *ptid;
      36    void *tls;
      37    void *ctid;
      38    va_list ap;
      39    int err;
      40  
      41    va_start (ap, arg);
      42    ptid = va_arg (ap, void *);
      43    tls = va_arg (ap, void *);
      44    ctid = va_arg (ap, void *);
      45    va_end (ap);
      46  
      47    /* Sanity check the arguments */
      48    err = -EINVAL;
      49    if (!fn)
      50      goto syscall_error;
      51    if (!child_stack)
      52      goto syscall_error;
      53  
      54    return __or1k_clone (fn, child_stack, flags, arg, ptid, tls, ctid);
      55  
      56  syscall_error:
      57    __set_errno (-err);
      58    return -1;
      59  }
      60  libc_hidden_def (__clone)
      61  weak_alias (__clone, clone)