| /* Copyright (C) 2005-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* vfork() is just a special case of clone(). */ |
| |
| #include <sys/asm.h> |
| #include <sysdep.h> |
| #include <asm/unistd.h> |
| #include <sgidefs.h> |
| |
| #ifndef SAVE_PID |
| #define SAVE_PID |
| #endif |
| |
| #ifndef RESTORE_PID |
| #define RESTORE_PID |
| #endif |
| |
| |
| /* int vfork() */ |
| |
| .text |
| .set nomips16 |
| LOCALSZ= 1 |
| FRAMESZ= (((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK |
| GPOFF= FRAMESZ-(1*SZREG) |
| NESTED(__vfork,FRAMESZ,sp) |
| #ifdef __PIC__ |
| SETUP_GP |
| #endif |
| PTR_SUBU sp, FRAMESZ |
| cfi_adjust_cfa_offset (FRAMESZ) |
| SETUP_GP64_REG (a5, __vfork) |
| #ifdef __PIC__ |
| SAVE_GP (GPOFF) |
| #endif |
| #ifdef PROF |
| # if (_MIPS_SIM != _ABIO32) |
| PTR_S a5, GPOFF(sp) |
| # endif |
| .set noat |
| move $1, ra |
| # if (_MIPS_SIM == _ABIO32) |
| subu sp,sp,8 |
| # endif |
| jal _mcount |
| .set at |
| # if (_MIPS_SIM != _ABIO32) |
| PTR_L a5, GPOFF(sp) |
| # endif |
| #endif |
| |
| PTR_ADDU sp, FRAMESZ |
| cfi_adjust_cfa_offset (-FRAMESZ) |
| |
| SAVE_PID |
| |
| li a0, 0x4112 /* CLONE_VM | CLONE_VFORK | SIGCHLD */ |
| move a1, sp |
| |
| /* Do the system call */ |
| li v0,__NR_clone |
| syscall |
| |
| RESTORE_PID |
| |
| cfi_remember_state |
| bnez a3,L(error) |
| |
| /* Successful return from the parent or child. */ |
| RESTORE_GP64_REG |
| ret |
| |
| /* Something bad happened -- no child created. */ |
| L(error): |
| cfi_restore_state |
| #ifdef __PIC__ |
| PTR_LA t9, __syscall_error |
| RESTORE_GP64_REG |
| jr t9 |
| #else |
| RESTORE_GP64_REG |
| j __syscall_error |
| #endif |
| END(__vfork) |
| |
| libc_hidden_def(__vfork) |
| weak_alias (__vfork, vfork) |
