vfork implementation for LinuxThreads/Arm.

sysdeps/unix/sysv/linux/arm/linuxthreads/vfork.S

@@ -0,0 +1,57 @@
+/* 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>
+
+/* Clone the calling process, but without copying the whole address
+pace.
+   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
+rocess,
+   and the process ID of the new process to the old process.  */
+
+	PSEUDO_PROLOGUE
+
+ENTRY (__vfork)
+
+#ifdef __NR_vfork
+	SINGLE_THREAD_P
+	bne	HIDDEN_JUMPTARGET (__fork)
+	swi	__NR_vfork
+	cmn	a1, #4096
+	RETINSTR(movcc, pc, lr)
+
+	/* Check if vfork syscall is known at all.  */
+	ldr	a2, =-ENOSYS
+	teq	a1, a2
+	bne	PLTJMP(C_SYMBOL_NAME(__syscall_error))
+#endif
+
+	/* If we don't have vfork, fork is close enough.  */
+	swi	__NR_fork
+	cmn	a1, #4096
+	RETINSTR(movcc, pc, lr)
+    	b	PLTJMP(C_SYMBOL_NAME(__syscall_error))
+
+PSEUDO_END (__vfork)
+libc_hidden_def (__vfork)
+
+weak_alias (__vfork, vfork)