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4abf7dea AJ |
1 | /* Copyright (C) 2005 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 | |
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 | |
37 | LOCALSZ= 1 | |
38 | FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK | |
39 | GPOFF= FRAMESZ-(1*SZREG) | |
40 | NESTED(__vfork,FRAMESZ,sp) | |
41 | #ifdef __PIC__ | |
42 | SETUP_GP | |
43 | #endif | |
44 | PTR_SUBU sp, FRAMESZ | |
45 | SETUP_GP64 (a5, __vfork) | |
46 | #ifdef __PIC__ | |
47 | SAVE_GP (GPOFF) | |
48 | #endif | |
49 | #ifdef PROF | |
50 | # if (_MIPS_SIM != _ABIO32) | |
51 | PTR_S a5, GPOFF(sp) | |
52 | # endif | |
53 | .set noat | |
54 | move $1, ra | |
55 | # if (_MIPS_SIM == _ABIO32) | |
56 | subu sp,sp,8 | |
57 | # endif | |
58 | jal _mcount | |
59 | .set at | |
60 | # if (_MIPS_SIM != _ABIO32) | |
61 | PTR_L a5, GPOFF(sp) | |
62 | # endif | |
63 | #endif | |
64 | ||
65 | PTR_ADDU sp, FRAMESZ | |
66 | ||
67 | SAVE_PID | |
68 | ||
69 | li a0, 0x4112 /* CLONE_VM | CLONE_VFORK | SIGCHLD */ | |
70 | move a1, sp | |
71 | ||
72 | /* Do the system call */ | |
73 | li v0,__NR_clone | |
74 | syscall | |
75 | ||
76 | RESTORE_PID | |
77 | ||
78 | bnez a3,L(error) | |
79 | ||
80 | /* Successful return from the parent or child. */ | |
81 | RESTORE_GP64 | |
82 | ret | |
83 | ||
84 | /* Something bad happened -- no child created. */ | |
85 | L(error): | |
86 | #ifdef __PIC__ | |
87 | PTR_LA t9, __syscall_error | |
88 | RESTORE_GP64 | |
89 | jr t9 | |
90 | #else | |
91 | RESTORE_GP64 | |
92 | j __syscall_error | |
93 | #endif | |
94 | END(__vfork) | |
95 | ||
96 | libc_hidden_def(__vfork) | |
8796ce21 | 97 | weak_alias (__vfork, vfork) |