| /* Copyright (C) 1999-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Andreas Schwab <schwab@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> |
| #include <kernel-features.h> |
| |
| #ifndef SAVE_PID |
| #define SAVE_PID |
| #endif |
| |
| #ifndef RESTORE_PID |
| #define RESTORE_PID |
| #endif |
| |
| /* 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) |
| |
| /* SAVE_PID clobbers call-clobbered registers and |
| saves data in D1 and A1. */ |
| |
| SAVE_PID |
| |
| /* Pop the return PC value into A0. */ |
| movel %sp@+, %a0 |
| cfi_adjust_cfa_offset (-4) |
| cfi_register (%pc, %a0) |
| |
| /* Stuff the syscall number in D0 and trap into the kernel. */ |
| movel #SYS_ify (vfork), %d0 |
| trap #0 |
| |
| RESTORE_PID |
| |
| tstl %d0 |
| jmi .Lerror /* Branch forward if it failed. */ |
| |
| /* Jump to the return PC. */ |
| jmp %a0@ |
| |
| .Lerror: |
| /* Push back the return PC. */ |
| movel %a0,%sp@- |
| cfi_adjust_cfa_offset (4) |
| cfi_rel_offset (%pc, 0) |
| |
| #ifndef PIC |
| jbra SYSCALL_ERROR_LABEL |
| #endif |
| |
| PSEUDO_END (__vfork) |
| libc_hidden_def (__vfork) |
| |
| weak_alias (__vfork, vfork) |
