mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-21 04:31:04 +08:00
112 lines
2.8 KiB
ArmAsm
112 lines
2.8 KiB
ArmAsm
/* Copyright (C) 2005-2015 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>
|
|
#include <tls.h>
|
|
|
|
|
|
/* 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 the PID value. */
|
|
READ_THREAD_POINTER(v1) /* Get the thread pointer. */
|
|
lw a2, PID_OFFSET(v1) /* Load the saved PID. */
|
|
subu a2, $0, a2 /* Negate it. */
|
|
bnez a2, 1f /* If it was zero... */
|
|
lui a2, 0x8000 /* use 0x80000000 instead. */
|
|
1: sw a2, PID_OFFSET(v1) /* Store the temporary PID. */
|
|
|
|
li a0, 0x4112 /* CLONE_VM | CLONE_VFORK | SIGCHLD */
|
|
move a1, sp
|
|
|
|
/* Do the system call */
|
|
li v0,__NR_clone
|
|
syscall
|
|
|
|
/* Restore the old PID value in the parent. */
|
|
beqz v0, 1f /* If we are the parent... */
|
|
READ_THREAD_POINTER(v1) /* Get the thread pointer. */
|
|
lw a2, PID_OFFSET(v1) /* Load the saved PID. */
|
|
subu a2, $0, a2 /* Re-negate it. */
|
|
lui a0, 0x8000 /* Load 0x80000000... */
|
|
bne a2, a0, 2f /* ... compare against it... */
|
|
li a2, 0 /* ... use 0 instead. */
|
|
2: sw a2, PID_OFFSET(v1) /* Restore the PID. */
|
|
1:
|
|
|
|
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)
|
|
strong_alias (__vfork, __libc_vfork)
|