1 | /* Copyright (C) 1999-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library. If not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <sysdep.h> |
19 | #define _ERRNO_H 1 |
20 | #include <bits/errno.h> |
21 | #include <tcb-offsets.h> |
22 | |
23 | /* Clone the calling process, but without copying the whole address space. |
24 | The calling process is suspended until the new process exits or is |
25 | replaced by a call to `execve'. Return -1 for errors, 0 to the new process, |
26 | and the process ID of the new process to the old process. */ |
27 | |
28 | ENTRY (__vfork) |
29 | |
30 | /* Pop the return PC value into A0. */ |
31 | movel %sp@+, %a0 |
32 | cfi_adjust_cfa_offset (-4) |
33 | cfi_register (%pc, %a0) |
34 | |
35 | /* Stuff the syscall number in D0 and trap into the kernel. */ |
36 | movel #SYS_ify (vfork), %d0 |
37 | trap #0 |
38 | |
39 | tstl %d0 |
40 | jmi .Lerror /* Branch forward if it failed. */ |
41 | |
42 | /* Jump to the return PC. */ |
43 | jmp %a0@ |
44 | |
45 | .Lerror: |
46 | /* Push back the return PC. */ |
47 | movel %a0,%sp@- |
48 | cfi_adjust_cfa_offset (4) |
49 | cfi_rel_offset (%pc, 0) |
50 | |
51 | #ifndef PIC |
52 | jbra SYSCALL_ERROR_LABEL |
53 | #endif |
54 | |
55 | PSEUDO_END (__vfork) |
56 | libc_hidden_def (__vfork) |
57 | |
58 | weak_alias (__vfork, vfork) |
59 | strong_alias (__vfork, __libc_vfork) |
60 | |