* sysdeps/alpha/tcb-offsets.sym (PID_OFFSET): New. * sysdeps/unix/sysv/linux/alpha/pt-vfork.S: Save/restore PID. * sysdeps/unix/sysv/linux/alpha/vfork.S: New file.

2004-03-11  Richard Henderson  <rth@redhat.com>

	* sysdeps/alpha/tcb-offsets.sym (PID_OFFSET): New.
	* sysdeps/unix/sysv/linux/alpha/pt-vfork.S: Save/restore PID.
	* sysdeps/unix/sysv/linux/alpha/vfork.S: New file.

3 files changed, 69 insertions, 4 deletions

diff --git a/nptl/sysdeps/alpha/tcb-offsets.sym b/nptl/sysdeps/alpha/tcb-offsets.sym
index 3f6433d..a1a1e45 100644
--- a/nptl/sysdeps/alpha/tcb-offsets.sym
+++ b/nptl/sysdeps/alpha/tcb-offsets.sym
@@ -10,3 +10,4 @@
 #if TLS_MULTIPLE_THREADS_IN_TCB
 MULTIPLE_THREADS_OFFSET		thread_offsetof (header.multiple_threads)
 #endif
+PID_OFFSET			thread_offsetof (pid)
diff --git a/nptl/sysdeps/unix/sysv/linux/alpha/pt-vfork.S b/nptl/sysdeps/unix/sysv/linux/alpha/pt-vfork.S
index 4a2df425..ec5d175 100644
--- a/nptl/sysdeps/unix/sysv/linux/alpha/pt-vfork.S
+++ b/nptl/sysdeps/unix/sysv/linux/alpha/pt-vfork.S
@@ -1,4 +1,4 @@
-/* Copyright (C) 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 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
@@ -16,10 +16,28 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <sysdep-cancel.h>
+#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;							\
+	/* Write back its negation, 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.  */	\
+	negl	a2, 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(__vfork, vfork, 0)
-	ret
 PSEUDO_END (__vfork)
 
 weak_alias (__vfork, vfork)
diff --git a/nptl/sysdeps/unix/sysv/linux/alpha/vfork.S b/nptl/sysdeps/unix/sysv/linux/alpha/vfork.S
new file mode 100644
index 0000000..8bdf0eb
--- /dev/null
+++ b/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)
+
+weak_alias (__vfork, vfork)