sysdeps/unix/sysv/linux/or1k/clone.c

   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)