1/* Copyright (C) 2005-2022 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/* vfork() is just a special case of clone().  */
19
20#include <sys/asm.h>
21#include <sysdep.h>
22#include <sgidefs.h>
23#include <tls.h>
24
25
26/* int vfork() */
27
28	.text
29	.set		nomips16
30LOCALSZ= 1
31FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK
32GPOFF= FRAMESZ-(1*SZREG)
33NESTED(__libc_vfork,FRAMESZ,sp)
34#ifdef __PIC__
35	SETUP_GP
36#endif
37	PTR_SUBU sp, FRAMESZ
38	cfi_adjust_cfa_offset (FRAMESZ)
39	SETUP_GP64_REG (a5, __libc_vfork)
40#ifdef __PIC__
41	SAVE_GP (GPOFF)
42#endif
43#ifdef PROF
44# if (_MIPS_SIM != _ABIO32)
45	PTR_S		a5, GPOFF(sp)
46# endif
47	.set		noat
48	move		$1, ra
49# if (_MIPS_SIM == _ABIO32)
50	subu		sp,sp,8
51# endif
52	jal		_mcount
53	.set		at
54# if (_MIPS_SIM != _ABIO32)
55	PTR_L		a5, GPOFF(sp)
56# endif
57#endif
58
59	PTR_ADDU	sp, FRAMESZ
60	cfi_adjust_cfa_offset (-FRAMESZ)
61
62	li		a0, 0x4112	/* CLONE_VM | CLONE_VFORK | SIGCHLD */
63	move		a1, sp
64
65	/* Do the system call */
66	li		v0,__NR_clone
67	syscall
68
69	cfi_remember_state
70	bnez		a3,L(error)
71
72	/* Successful return from the parent or child.  */
73	RESTORE_GP64_REG
74	ret
75
76	/* Something bad happened -- no child created.  */
77L(error):
78	cfi_restore_state
79#ifdef __PIC__
80	PTR_LA		t9, __syscall_error
81	RESTORE_GP64_REG
82	jr		t9
83#else
84	RESTORE_GP64_REG
85	j		__syscall_error
86#endif
87	END(__libc_vfork)
88
89#if IS_IN (libc)
90weak_alias (__libc_vfork, vfork)
91strong_alias (__libc_vfork, __vfork)
92libc_hidden_def (__vfork)
93#endif
94