/* * libc/sysdeps/linux/nios2/clone.c -- `clone' syscall for linux/nios2 * * Copyright (C) 2004,05 Microtronix Datacom Ltd * Copyright (C) 2002,03 NEC Electronics Corporation * Copyright (C) 2002,03 Miles Bader <miles@gnu.org> * * This file is subject to the terms and conditions of the GNU Lesser * General Public License. See the file COPYING.LIB in the main * directory of this archive for more details. * * Written by Miles Bader <miles@gnu.org> * Nios2 port by Wentao Xu */ #include <errno.h> #include <sys/syscall.h> int clone (int (*fn)(void *arg), void *child_stack, int flags, void *arg) { register unsigned long rval asm ("r2") = -EINVAL; if (fn && child_stack) { register unsigned long syscall asm ("r3"); register unsigned long arg0 asm ("r4"); register unsigned long arg1 asm ("r5"); /* Clone this thread. */ rval = TRAP_ID_SYSCALL; syscall = __NR_clone; arg0 = flags; arg1 = (unsigned long)child_stack; asm volatile ("trap " : "=r" (rval), "=r" (syscall) : "0" (rval),"1" (syscall), "r" (arg0), "r" (arg1) ); if (rval == 0) { /* In child thread, call fn and exit. */ arg0 = (*fn) (arg); syscall = __NR_exit; asm volatile ("trap " : "=r" (rval), "=r" (syscall) : "1" (syscall), "r" (arg0)); } } __syscall_return (int, rval); }