diff options
Diffstat (limited to 'libc/sysdeps/linux/microblaze/vfork.S')
| -rw-r--r-- | libc/sysdeps/linux/microblaze/vfork.S | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/microblaze/vfork.S b/libc/sysdeps/linux/microblaze/vfork.S new file mode 100644 index 000000000..e264d36f9 --- /dev/null +++ b/libc/sysdeps/linux/microblaze/vfork.S @@ -0,0 +1,45 @@ +/* + * 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) |