Subject: [PATCH] libpthread: AVR32 support

Implement pt-machine.h for AVR32.
---

 libpthread/linuxthreads/sysdeps/avr32/pt-machine.h |   92 +++++++++++++++++++++
 1 file changed, 92 insertions(+)

Index: uClibc-0.9.28/libpthread/linuxthreads/sysdeps/avr32/pt-machine.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ uClibc-0.9.28/libpthread/linuxthreads/sysdeps/avr32/pt-machine.h	2006-02-07 17:14:47.000000000 +0100
@@ -0,0 +1,92 @@
+/* Machine-dependent pthreads configuration and inline functions.
+
+   Copyright (C) 2005 Atmel Norway
+   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; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef _PT_MACHINE_H
+#define _PT_MACHINE_H   1
+
+#include <features.h>
+
+static inline int
+_test_and_set (int *p, int v) __THROW
+{
+	int result;
+
+	__asm__ __volatile__(
+		"/* Inline test and set */\n"
+		"1:	ssrf	5\n"
+		"	ld.w	%0, %2\n"
+		"	tst	%0, %3\n"
+		"	breq	2f\n"
+		"	stcond	%1, %3\n"
+		"	brne	1b\n"
+		"2:"
+		: "=&r"(result), "=m"(*p)
+		: "m"(*p), "r"(v)
+		: "memory", "cc");
+
+	return result;
+}
+
+#ifndef PT_EI
+# define PT_EI extern inline
+#endif
+
+extern long int testandset (int *spinlock);
+extern int __compare_and_swap (long int *p, long int oldval, long int newval);
+
+/* Spinlock implementation; required.  */
+PT_EI long int
+testandset (int *spinlock)
+{
+	return _test_and_set(spinlock, 1);
+}
+
+
+/* Get some notion of the current stack.  Need not be exactly the top
+   of the stack, just something somewhere in the current frame.  */
+#define CURRENT_STACK_FRAME  stack_pointer
+register char * stack_pointer __asm__ ("sp");
+
+/* Compare-and-swap for semaphores. */
+
+#define HAS_COMPARE_AND_SWAP
+PT_EI int
+__compare_and_swap(long int *p, long int oldval, long int newval)
+{
+	long int result, tmp;
+
+	__asm__ __volatile__(
+		"/* Inline compare and swap */\n"
+		"1:	ssrf	5\n"
+		"	ld.w	%1, %3\n"
+		"	cp.w	%1, %5\n"
+		"	sreq	%0\n"
+		"	brne	2f\n"
+		"	stcond	%2, %4\n"
+		"	brne	1b\n"
+		"2:"
+		: "=&r"(result), "=&r"(tmp), "=m"(*p)
+		: "m"(*p), "r"(newval), "r"(oldval)
+		: "cc", "memory");
+
+	return result;
+}
+
+#endif /* pt-machine.h */