libpthread/nptl: core of the "Native Posix Threading Library" for uClibc

targetting arm,sh,i386,mips,sparc for now

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/alpha/vfork.S b/libpthread/nptl/sysdeps/unix/sysv/linux/alpha/vfork.S
new file mode 100644
index 000000000..f0c39982c
--- /dev/null
+++ b/libpthread/nptl/sysdeps/unix/sysv/linux/alpha/vfork.S
@@ -0,0 +1,46 @@
+/* Copyright (C) 2004 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sysdep.h>
+#include <tcb-offsets.h>
+
+#undef PSEUDO_PREPARE_ARGS
+#define PSEUDO_PREPARE_ARGS						\
+	/* Load the current cached pid value across the vfork.  */	\
+	rduniq;								\
+	ldl	a2, PID_OFFSET(v0);					\
+	mov	v0, a1;							\
+	/* If the cached value is initialized (nonzero), then write	\
+	   back its negation, or INT_MIN, to indicate that the pid	\
+	   value is uninitialized in the the child, and in the window	\
+	   between here and the point at which we restore the value.  */ \
+	ldah	t0, -0x8000;						\
+	negl	a2, t1;							\
+	cmovne	a2, t1, t0;						\
+	stl	t0, PID_OFFSET(v0);
+
+PSEUDO (__vfork, vfork, 0)
+
+	/* If we're back in the parent, restore the saved pid.  */
+	beq	v0, 1f
+	stl	a2, PID_OFFSET(a1)
+1:	ret
+
+PSEUDO_END (__vfork)
+hidden_def (__vfork)
+weak_alias (__vfork, vfork)