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1/* Copyright (C) 1999-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Philip Blundell <philb@gnu.org>.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <sysdep.h>
20#define _ERRNO_H 1
21#include <bits/errno.h>
22#include <tcb-offsets.h>
23
24
25/* Clone the calling process, but without copying the whole address space.
26 The calling process is suspended until the new process exits or is
27 replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
28 and the process ID of the new process to the old process. */
29
30ENTRY (__vfork)
31 /* The DO_CALL macro saves r7 on the stack, to enable generation
32 of ARM unwind info. Since the stack is initially shared between
33 parent and child of vfork, that saved value could be corrupted.
34 To avoid this problem, we save r7 into ip as well, and restore
35 from there. */
36 mov ip, r7
37 cfi_register (r7, ip)
38 .fnstart
39 push { r7 }
40 cfi_adjust_cfa_offset (4)
41 .save { r7 }
42 ldr r7, =SYS_ify (vfork)
43 swi 0x0
44 .fnend
45 add sp, sp, #4
46 cfi_adjust_cfa_offset (-4)
47 mov r7, ip
48 cfi_restore (r7)
49
50 cmn a1, #4096
51 it cc
52 RETINSTR(cc, lr)
53
54 b PLTJMP(SYSCALL_ERROR)
55PSEUDO_END (__vfork)
56libc_hidden_def (__vfork)
57
58weak_alias (__vfork, vfork)
59strong_alias (__vfork, __libc_vfork)
60

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