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d4697bc9 | 1 | /* Copyright (C) 2005-2014 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 PE |
15 | License along with the GNU C Library. If not, see |
16 | <http://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> | |
24 | ||
25 | #ifndef SAVE_PID | |
26 | #define SAVE_PID | |
27 | #endif | |
28 | ||
29 | #ifndef RESTORE_PID | |
30 | #define RESTORE_PID | |
31 | #endif | |
32 | ||
33 | ||
34 | /* int vfork() */ | |
35 | ||
36 | .text | |
43301bd3 | 37 | .set nomips16 |
4abf7dea AJ |
38 | LOCALSZ= 1 |
39 | FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK | |
40 | GPOFF= FRAMESZ-(1*SZREG) | |
41 | NESTED(__vfork,FRAMESZ,sp) | |
42 | #ifdef __PIC__ | |
43 | SETUP_GP | |
44 | #endif | |
45 | PTR_SUBU sp, FRAMESZ | |
aea7a9b9 JM |
46 | cfi_adjust_cfa_offset (FRAMESZ) |
47 | SETUP_GP64_REG (a5, __vfork) | |
4abf7dea AJ |
48 | #ifdef __PIC__ |
49 | SAVE_GP (GPOFF) | |
50 | #endif | |
51 | #ifdef PROF | |
52 | # if (_MIPS_SIM != _ABIO32) | |
53 | PTR_S a5, GPOFF(sp) | |
54 | # endif | |
55 | .set noat | |
56 | move $1, ra | |
57 | # if (_MIPS_SIM == _ABIO32) | |
58 | subu sp,sp,8 | |
59 | # endif | |
60 | jal _mcount | |
61 | .set at | |
62 | # if (_MIPS_SIM != _ABIO32) | |
63 | PTR_L a5, GPOFF(sp) | |
64 | # endif | |
65 | #endif | |
66 | ||
67 | PTR_ADDU sp, FRAMESZ | |
aea7a9b9 | 68 | cfi_adjust_cfa_offset (-FRAMESZ) |
4abf7dea AJ |
69 | |
70 | SAVE_PID | |
71 | ||
72 | li a0, 0x4112 /* CLONE_VM | CLONE_VFORK | SIGCHLD */ | |
73 | move a1, sp | |
74 | ||
75 | /* Do the system call */ | |
76 | li v0,__NR_clone | |
77 | syscall | |
78 | ||
79 | RESTORE_PID | |
80 | ||
aea7a9b9 | 81 | cfi_remember_state |
4abf7dea AJ |
82 | bnez a3,L(error) |
83 | ||
84 | /* Successful return from the parent or child. */ | |
aea7a9b9 | 85 | RESTORE_GP64_REG |
4abf7dea AJ |
86 | ret |
87 | ||
88 | /* Something bad happened -- no child created. */ | |
89 | L(error): | |
aea7a9b9 | 90 | cfi_restore_state |
4abf7dea AJ |
91 | #ifdef __PIC__ |
92 | PTR_LA t9, __syscall_error | |
aea7a9b9 | 93 | RESTORE_GP64_REG |
4abf7dea AJ |
94 | jr t9 |
95 | #else | |
aea7a9b9 | 96 | RESTORE_GP64_REG |
4abf7dea AJ |
97 | j __syscall_error |
98 | #endif | |
99 | END(__vfork) | |
100 | ||
101 | libc_hidden_def(__vfork) | |
8796ce21 | 102 | weak_alias (__vfork, vfork) |