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8eed661a56
* sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_VFORK_SYSCALL): Define for kernel 2.4 on arm. * sysdeps/unix/sysv/linux/arm/vfork.S: Elide compatibility code when __ASSUME_VFORK_SYSCALL is defined. * sysdeps/unix/sysv/linux/arm/mmap64.S: Likewise for __ASSUME_MMAP2_SYSCALL. * sysdeps/unix/sysv/linux/arm/sigaction.c: Likewise for __ASSUME_REALTIME_SIGNALS.
59 lines
1.8 KiB
ArmAsm
59 lines
1.8 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.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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ENTRY (__vfork)
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#ifdef __NR_vfork
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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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# ifdef __ASSUME_VFORK_SYSCALL
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b PLTJMP(C_SYMBOL_NAME(__syscall_error))
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# else
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/* Check if vfork syscall is known at all. */
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ldr a2, =-ENOSYS
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teq a1, a2
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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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b PLTJMP(C_SYMBOL_NAME(__syscall_error))
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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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