/* * libc/sysdeps/linux/microblaze/vfork.S -- `vfork' syscall for linux/microblaze * * Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au> * Copyright (C) 2001 NEC Corporation * Copyright (C) 2001 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 */ #define _ERRNO_H 1 #include <bits/errno.h> #define _SYSCALL_H #include <bits/sysnum.h> #include <clinkage.h> /* Clone the calling process, but without copying the whole address space. The calling process is suspended until the new process exits or is replaced by a call to `execve'. Return -1 for errors, 0 to the new process, and the process ID of the new process to the old process. */ .global C_SYMBOL_NAME(errno) C_ENTRY (__vfork): addi r12, r0, SYS_vfork bralid r17, 0x08; nop addi r4, r3, 125 // minimum err value blti r4, 1f // is r3 < -125? rtsd r15, 8 // normal return nop 1: sub r3, r3, r0 // r3 = -r3 swi r3, r0, C_SYMBOL_NAME(errno); rtsd r15, 8 // error return nop C_END(__vfork) .weak C_SYMBOL_NAME(vfork) C_SYMBOL_NAME(vfork) = C_SYMBOL_NAME(__vfork)