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04277e02 | 1 | /* Copyright (C) 2005-2019 Free Software Foundation, Inc. |
4abf7dea AJ |
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 | |
ab84e3ff | 15 | License along with the GNU C Library. If not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
4abf7dea AJ |
17 | |
18 | /* vfork() is just a special case of clone(). */ | |
19 | ||
20 | #include <sys/asm.h> | |
21 | #include <sysdep.h> | |
22 | #include <asm/unistd.h> | |
23 | #include <sgidefs.h> | |
58eb0862 | 24 | #include <tls.h> |
4abf7dea AJ |
25 | |
26 | ||
27 | /* int vfork() */ | |
28 | ||
29 | .text | |
43301bd3 | 30 | .set nomips16 |
4abf7dea AJ |
31 | LOCALSZ= 1 |
32 | FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK | |
33 | GPOFF= FRAMESZ-(1*SZREG) | |
b87c1ec3 | 34 | NESTED(__libc_vfork,FRAMESZ,sp) |
4abf7dea AJ |
35 | #ifdef __PIC__ |
36 | SETUP_GP | |
37 | #endif | |
38 | PTR_SUBU sp, FRAMESZ | |
aea7a9b9 | 39 | cfi_adjust_cfa_offset (FRAMESZ) |
b87c1ec3 | 40 | SETUP_GP64_REG (a5, __libc_vfork) |
4abf7dea AJ |
41 | #ifdef __PIC__ |
42 | SAVE_GP (GPOFF) | |
43 | #endif | |
44 | #ifdef PROF | |
45 | # if (_MIPS_SIM != _ABIO32) | |
46 | PTR_S a5, GPOFF(sp) | |
47 | # endif | |
48 | .set noat | |
49 | move $1, ra | |
50 | # if (_MIPS_SIM == _ABIO32) | |
51 | subu sp,sp,8 | |
52 | # endif | |
53 | jal _mcount | |
54 | .set at | |
55 | # if (_MIPS_SIM != _ABIO32) | |
56 | PTR_L a5, GPOFF(sp) | |
57 | # endif | |
58 | #endif | |
59 | ||
60 | PTR_ADDU sp, FRAMESZ | |
aea7a9b9 | 61 | cfi_adjust_cfa_offset (-FRAMESZ) |
4abf7dea | 62 | |
4abf7dea AJ |
63 | li a0, 0x4112 /* CLONE_VM | CLONE_VFORK | SIGCHLD */ |
64 | move a1, sp | |
65 | ||
66 | /* Do the system call */ | |
67 | li v0,__NR_clone | |
68 | syscall | |
69 | ||
aea7a9b9 | 70 | cfi_remember_state |
4abf7dea AJ |
71 | bnez a3,L(error) |
72 | ||
73 | /* Successful return from the parent or child. */ | |
aea7a9b9 | 74 | RESTORE_GP64_REG |
4abf7dea AJ |
75 | ret |
76 | ||
77 | /* Something bad happened -- no child created. */ | |
78 | L(error): | |
aea7a9b9 | 79 | cfi_restore_state |
4abf7dea AJ |
80 | #ifdef __PIC__ |
81 | PTR_LA t9, __syscall_error | |
aea7a9b9 | 82 | RESTORE_GP64_REG |
4abf7dea AJ |
83 | jr t9 |
84 | #else | |
aea7a9b9 | 85 | RESTORE_GP64_REG |
4abf7dea AJ |
86 | j __syscall_error |
87 | #endif | |
b87c1ec3 | 88 | END(__libc_vfork) |
4abf7dea | 89 | |
43c29487 | 90 | #if IS_IN (libc) |
b87c1ec3 AJ |
91 | weak_alias (__libc_vfork, vfork) |
92 | strong_alias (__libc_vfork, __vfork) | |
93 | libc_hidden_def (__vfork) | |
43c29487 | 94 | #endif |