[git commit] LT.old: Add ARC support

[Bernhard Reutner-Fischer]

commit: http://git.uclibc.org/uClibc/commit/?id=374db5d1748fe23d8203479c29ecff2b22fca95c
branch: http://git.uclibc.org/uClibc/commit/?id=refs/heads/master

Signed-off-by: Vineet Gupta <vgupta at synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop at gmail.com>
---
 .../linuxthreads.old/sysdeps/arc/pt-machine.h      |   42 ++++++++++++++++++++
 1 files changed, 42 insertions(+), 0 deletions(-)

diff --git a/libpthread/linuxthreads.old/sysdeps/arc/pt-machine.h b/libpthread/linuxthreads.old/sysdeps/arc/pt-machine.h
new file mode 100644
index 0000000..8df1e77
--- /dev/null
+++ b/libpthread/linuxthreads.old/sysdeps/arc/pt-machine.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _PT_MACHINE_H
+#define _PT_MACHINE_H   1
+#include <features.h>
+
+#ifndef PT_EI
+# define PT_EI __extern_always_inline
+#endif
+
+extern long int testandset (int *spinlock);
+extern int __compare_and_swap (long int *p, long int oldval, long int newval);
+
+PT_EI long int
+testandset (int *spinlock)
+{
+	unsigned int old = 1;
+
+	/* Atomically exchange @spinlock with 1 */
+	__asm__ __volatile__(
+	"ex %0, [%1]"
+	: "+r" (old)
+	: "r" (spinlock)
+	: "memory");
+
+  return old;
+
+}
+
+/* Get some notion of the current stack.  Need not be exactly the top
+   of the stack, just something somewhere in the current frame.
+   I don't trust register variables, so let's do this the safe way.  */
+#define CURRENT_STACK_FRAME \
+__extension__ ({ char *__sp; __asm__ ("mov %0,sp" : "=r" (__sp)); __sp; })
+
+#else
+#error PT_MACHINE already defined
+#endif /* pt-machine.h */