| /* Copyright (C) 1999-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Philip Blundell <philb@gnu.org>. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sysdep.h> |
| #define _ERRNO_H 1 |
| #include <bits/errno.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. */ |
| |
| ENTRY (__vfork) |
| #ifdef SAVE_PID |
| SAVE_PID |
| #endif |
| /* The DO_CALL macro saves r7 on the stack, to enable generation |
| of ARM unwind info. Since the stack is initially shared between |
| parent and child of vfork, that saved value could be corrupted. |
| To avoid this problem, we save r7 into ip as well, and restore |
| from there. */ |
| mov ip, r7 |
| cfi_register (r7, ip) |
| .fnstart |
| push { r7 } |
| cfi_adjust_cfa_offset (4) |
| .save { r7 } |
| ldr r7, =SYS_ify (vfork) |
| swi 0x0 |
| .fnend |
| add sp, sp, #4 |
| cfi_adjust_cfa_offset (-4) |
| mov r7, ip |
| cfi_restore (r7); |
| #ifdef RESTORE_PID |
| RESTORE_PID |
| #endif |
| cmn a1, #4096 |
| it cc |
| RETINSTR(cc, lr) |
| |
| b PLTJMP(SYSCALL_ERROR) |
| PSEUDO_END (__vfork) |
| libc_hidden_def (__vfork) |
| |
| weak_alias (__vfork, vfork) |
