/* * libc/sysdeps/linux/microblaze/clone.c -- `clone' syscall for linux/microblaze * * Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au> * 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> * Microblaze port by John Williams */ #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__ (SYSCALL_RET) = -EINVAL; if (fn && child_stack) { register unsigned long syscall __asm__ (SYSCALL_NUM); register unsigned long arg0 __asm__ (SYSCALL_ARG0); register unsigned long arg1 __asm__ (SYSCALL_ARG1); /* Clone this thread. */ arg0 = flags; arg1 = (unsigned long)child_stack; syscall = __NR_clone; __asm__ __volatile__ ("bralid r17, trap;nop;" : "=r" (rval), "=r" (syscall) : "1" (syscall), "r" (arg0), "r" (arg1) : SYSCALL_CLOBBERS); if (rval == 0) /* In child thread, call FN and exit. */ { arg0 = (*fn) (arg); syscall = __NR_exit; __asm__ __volatile__ ("bralid r17, trap;nop;" : "=r" (rval), "=r" (syscall) : "1" (syscall), "r" (arg0) : SYSCALL_CLOBBERS); } } __syscall_return (int, rval); }