1 /* Copyright (C) 2004-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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 <http://www.gnu.org/licenses/>. */
19 #include <tcb-offsets.h>
24 /* Load the thread pointer value in A1 across the vfork. */
28 /* Save the TCB-cached PID away in A2, and then negate the TCB
29 field. But if it's zero, set it to 0x80000000 instead. See
30 raise.c for the logic that relies on this value. */
31 ldl a2, PID_OFFSET(v0)
35 stl t0, PID_OFFSET(v0);
37 lda v0, SYS_ify(vfork)
40 /* Restore the original value of the TCB cache of the PID, if we're
41 the parent. But in the child (syscall return value equals zero),
42 leave things as they are. */
44 stl a2, PID_OFFSET(a1)
46 /* Normal error check and return. */
47 bne a3, SYSCALL_ERROR_LABEL
50 PSEUDO_END (__libc_vfork)
53 weak_alias (__libc_vfork, vfork)
54 strong_alias (__libc_vfork, __vfork)
55 libc_hidden_def (__vfork)