1 /* Copyright (C) 2005-2015 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/>. */
18 /* vfork() is just a special case of clone(). */
22 #include <asm/unistd.h>
32 FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK
33 GPOFF= FRAMESZ-(1*SZREG)
34 NESTED(__vfork,FRAMESZ,sp)
39 cfi_adjust_cfa_offset (FRAMESZ)
40 SETUP_GP64_REG (a5, __vfork)
45 # if (_MIPS_SIM != _ABIO32)
50 # if (_MIPS_SIM == _ABIO32)
55 # if (_MIPS_SIM != _ABIO32)
61 cfi_adjust_cfa_offset (-FRAMESZ)
63 /* Save the PID value. */
64 READ_THREAD_POINTER(v1) /* Get the thread pointer. */
65 lw a2, PID_OFFSET(v1) /* Load the saved PID. */
66 subu a2, $0, a2 /* Negate it. */
67 bnez a2, 1f /* If it was zero... */
68 lui a2, 0x8000 /* use 0x80000000 instead. */
69 1: sw a2, PID_OFFSET(v1) /* Store the temporary PID. */
71 li a0, 0x4112 /* CLONE_VM | CLONE_VFORK | SIGCHLD */
74 /* Do the system call */
78 /* Restore the old PID value in the parent. */
79 beqz v0, 1f /* If we are the parent... */
80 READ_THREAD_POINTER(v1) /* Get the thread pointer. */
81 lw a2, PID_OFFSET(v1) /* Load the saved PID. */
82 subu a2, $0, a2 /* Re-negate it. */
83 lui a0, 0x8000 /* Load 0x80000000... */
84 bne a2, a0, 2f /* ... compare against it... */
85 li a2, 0 /* ... use 0 instead. */
86 2: sw a2, PID_OFFSET(v1) /* Restore the PID. */
92 /* Successful return from the parent or child. */
96 /* Something bad happened -- no child created. */
100 PTR_LA t9, __syscall_error
109 libc_hidden_def(__vfork)
110 weak_alias (__vfork, vfork)
111 strong_alias (__vfork, __libc_vfork)