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- /*
- * 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)
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