projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 568035b7 | 1 | /* Copyright (C) 2005-2013 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 | |
| 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 | |
| aea7a9b9 JM |
45 | cfi_adjust_cfa_offset (FRAMESZ) |
| 46 | SETUP_GP64_REG (a5, __vfork) | |
| 4abf7dea AJ |
47 | #ifdef __PIC__ |
| 48 | SAVE_GP (GPOFF) | |
| 49 | #endif | |
| 50 | #ifdef PROF | |
| 51 | # if (_MIPS_SIM != _ABIO32) | |
| 52 | PTR_S a5, GPOFF(sp) | |
| 53 | # endif | |
| 54 | .set noat | |
| 55 | move $1, ra | |
| 56 | # if (_MIPS_SIM == _ABIO32) | |
| 57 | subu sp,sp,8 | |
| 58 | # endif | |
| 59 | jal _mcount | |
| 60 | .set at | |
| 61 | # if (_MIPS_SIM != _ABIO32) | |
| 62 | PTR_L a5, GPOFF(sp) | |
| 63 | # endif | |
| 64 | #endif | |
| 65 | ||
| 66 | PTR_ADDU sp, FRAMESZ | |
| aea7a9b9 | 67 | cfi_adjust_cfa_offset (-FRAMESZ) |
| 4abf7dea AJ |
68 | |
| 69 | SAVE_PID | |
| 70 | ||
| 71 | li a0, 0x4112 /* CLONE_VM | CLONE_VFORK | SIGCHLD */ | |
| 72 | move a1, sp | |
| 73 | ||
| 74 | /* Do the system call */ | |
| 75 | li v0,__NR_clone | |
| 76 | syscall | |
| 77 | ||
| 78 | RESTORE_PID | |
| 79 | ||
| aea7a9b9 | 80 | cfi_remember_state |
| 4abf7dea AJ |
81 | bnez a3,L(error) |
| 82 | ||
| 83 | /* Successful return from the parent or child. */ | |
| aea7a9b9 | 84 | RESTORE_GP64_REG |
| 4abf7dea AJ |
85 | ret |
| 86 | ||
| 87 | /* Something bad happened -- no child created. */ | |
| 88 | L(error): | |
| aea7a9b9 | 89 | cfi_restore_state |
| 4abf7dea AJ |
90 | #ifdef __PIC__ |
| 91 | PTR_LA t9, __syscall_error | |
| aea7a9b9 | 92 | RESTORE_GP64_REG |
| 4abf7dea AJ |
93 | jr t9 |
| 94 | #else | |
| aea7a9b9 | 95 | RESTORE_GP64_REG |
| 4abf7dea AJ |
96 | j __syscall_error |
| 97 | #endif | |
| 98 | END(__vfork) | |
| 99 | ||
| 100 | libc_hidden_def(__vfork) | |
| 8796ce21 | 101 | weak_alias (__vfork, vfork) |