nds32: add support for new architecture

Add support for Andes Technology NDS32 architecture.
See here http://www.andestech.com/en/index/index.htm for more
informaton. Verification of the port from an older uClibc
port was done on a sponsored AG101p board.

The testsuite only has 5 errors, three are related to
an existing bug in dlclose() with LT.old, also happening
on cris32 and m68k.

Failures to fallocate/posix_fallocate are unresolved.

Thanks to Andes Technology sponsoring the hardware and
being very helpful while doing the uClibc-ng porting.

Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>

2 files changed, 168 insertions, 0 deletions

diff --git a/libpthread/linuxthreads/sysdeps/nds32/pspinlock.c b/libpthread/linuxthreads/sysdeps/nds32/pspinlock.c
new file mode 100644
index 000000000..f8adf07be
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/nds32/pspinlock.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* POSIX spinlock implementation.
+   Copyright (C) 2000 Free Software Foundation, Inc.
+
+   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.  */
+
+#include <errno.h>
+#include <pthread.h>
+#include "internals.h"
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+	unsigned int		val ;
+	unsigned int		temp ;
+	unsigned int		offset = 0 ;
+
+	__asm__ __volatile__ (
+		"1:\n\t"
+		"llw	%0,	[%1 + %2 << 0]\n\t"
+		"bnez	%0, 1b\n\t"
+		"movi	%3, #0x1\n\t"
+		"scw	%3,	[%1 + %2 << 0]\n\t"
+		"beqz	%3, 1b\n\t"
+		: "=&r" (val)
+		: "r" (lock), "r" (offset), "r" (temp)
+		: "memory" ) ;
+		
+	return 0 ;
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+	unsigned int		val ;
+	unsigned int		temp ;
+	unsigned int		offset = 0 ;
+
+	__asm__ __volatile__ (
+		"llw	%0,	[%1 + %2 << 0]\n\t"
+		"bnez	%0, 1f\n\t"
+		"movi	%3, #0x1\n\t"
+		"scw	%3,	[%1 + %2 << 0]\n\t"
+		"beqz	%3, 1f\n\t"
+		"movi	%0, #0x0\n\t"
+		"b	2f\n\t"
+		"1:\n\t"
+		"movi	%0, #16\n\t"
+		"2:\n\t"
+		: "=&r" (val)
+		: "r" (lock), "r" (offset), "r" (temp)
+		: "memory" ) ;
+		
+  return val;
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  return *lock = 0;
+}
+weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
+
+
+int
+__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+  /* We can ignore the `pshared' parameter.  Since we are busy-waiting
+     all processes which can access the memory location `lock' points
+     to can use the spinlock.  */
+  return *lock = 0;
+}
+weak_alias (__pthread_spin_init, pthread_spin_init)
+
+
+int
+__pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+  /* Nothing to do.  */
+  return 0;
+}
+weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
diff --git a/libpthread/linuxthreads/sysdeps/nds32/pt-machine.h b/libpthread/linuxthreads/sysdeps/nds32/pt-machine.h
new file mode 100644
index 000000000..5bbb9e850
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/nds32/pt-machine.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Machine-dependent pthreads configuration and inline functions.
+   Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
+   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; 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>
+
+#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);
+
+/* Spinlock implementation; required.  */
+PT_EI long int
+testandset (int *spinlock)
+{
+	unsigned int		val;
+	unsigned int		temp;
+	unsigned int		offset = 0;
+
+	__asm__ __volatile__ (
+		"1:\n\t"
+		"llw	%[val],	[%[spinlock] + %[offset] << 0]\n\t"
+		"move	%[temp], #0x1\n\t"
+		"beq	%[val], %[temp], 2f\n\t"
+		"scw	%[temp], [%[spinlock] + %[offset] << 0]\n\t"
+		"beqz   %[temp], 1b\n\t"
+		"2:\n\t"
+		: [val] "=&r" (val), [temp] "=&r" (temp)
+		: [spinlock] "r" (spinlock), [offset] "r" (offset)
+		: "memory" ) ;
+		
+	return val ;
+}
+
+
+/* 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");
+
+#endif /* pt-machine.h */