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81 lines
2.2 KiB
ArmAsm
81 lines
2.2 KiB
ArmAsm
/* Copyright (C) 1999, 2002, 2003 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Philip Blundell <philb@gnu.org>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep-cancel.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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#include <kernel-features.h>
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/* Clone the calling process, but without copying the whole address space.
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The calling process is suspended until the new process exits or is
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replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
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and the process ID of the new process to the old process. */
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PSEUDO_PROLOGUE
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ENTRY (__vfork)
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#ifdef __NR_vfork
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#ifdef SHARED
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ldr ip, 1f
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ldr r0, 2f
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3: add ip, pc, ip
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ldr r0, [ip, r0]
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#else
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ldr r0, 1f
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#endif
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movs r0, r0
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bne HIDDEN_JUMPTARGET (__fork)
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swi __NR_vfork
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cmn a1, #4096
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RETINSTR(movcc, pc, lr)
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#ifndef __ASSUME_VFORK_SYSCALL
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/* Check if vfork syscall is known at all. */
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cmn a1, #ENOSYS
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bne PLTJMP(C_SYMBOL_NAME(__syscall_error))
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#endif
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#endif
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#ifndef __ASSUME_VFORK_SYSCALL
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/* If we don't have vfork, fork is close enough. */
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swi __NR_fork
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cmn a1, #4096
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RETINSTR(movcc, pc, lr)
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#elif !defined __NR_vfork
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# error "__NR_vfork not available and __ASSUME_VFORK_SYSCALL defined"
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#endif
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b PLTJMP(C_SYMBOL_NAME(__syscall_error))
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#ifdef SHARED
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1: .word _GLOBAL_OFFSET_TABLE_ - 3b - 8
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2: .word __libc_pthread_functions(GOTOFF)
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#else
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.weak pthread_create
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1: .word pthread_create
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#endif
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PSEUDO_END (__vfork)
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libc_hidden_def (__vfork)
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weak_alias (__vfork, vfork)
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