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glibc/linuxthreads/sysdeps/unix/sysv/linux/arm/vfork.S
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/* Copyright (C) 1999, 2002, 2003 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Philip Blundell <philb@gnu.org>. | |
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, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#include <sysdep-cancel.h> | |
#define _ERRNO_H 1 | |
#include <bits/errno.h> | |
#include <kernel-features.h> | |
/* Clone the calling process, but without copying the whole address space. | |
The calling process is suspended until the new process exits or is | |
replaced by a call to `execve'. Return -1 for errors, 0 to the new process, | |
and the process ID of the new process to the old process. */ | |
PSEUDO_PROLOGUE | |
ENTRY (__vfork) | |
#ifdef __NR_vfork | |
#ifdef SHARED | |
ldr ip, 1f | |
ldr r0, 2f | |
3: add ip, pc, ip | |
ldr r0, [ip, r0] | |
#else | |
ldr r0, 1f | |
#endif | |
movs r0, r0 | |
bne HIDDEN_JUMPTARGET (__fork) | |
swi __NR_vfork | |
cmn a1, #4096 | |
RETINSTR(movcc, pc, lr) | |
#ifndef __ASSUME_VFORK_SYSCALL | |
/* Check if vfork syscall is known at all. */ | |
cmn a1, #ENOSYS | |
bne PLTJMP(C_SYMBOL_NAME(__syscall_error)) | |
#endif | |
#endif | |
#ifndef __ASSUME_VFORK_SYSCALL | |
/* If we don't have vfork, fork is close enough. */ | |
swi __NR_fork | |
cmn a1, #4096 | |
RETINSTR(movcc, pc, lr) | |
#elif !defined __NR_vfork | |
# error "__NR_vfork not available and __ASSUME_VFORK_SYSCALL defined" | |
#endif | |
b PLTJMP(C_SYMBOL_NAME(__syscall_error)) | |
#ifdef SHARED | |
1: .word _GLOBAL_OFFSET_TABLE_ - 3b - 8 | |
2: .word __libc_pthread_functions(GOTOFF) | |
#else | |
.weak pthread_create | |
1: .word pthread_create | |
#endif | |
PSEUDO_END (__vfork) | |
libc_hidden_def (__vfork) | |
weak_alias (__vfork, vfork) |