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>

1 files changed, 31 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/nds32/bits/uClibc_page.h b/libc/sysdeps/linux/nds32/bits/uClibc_page.h
new file mode 100644
index 000000000..0438493db
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/uClibc_page.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _UCLIBC_PAGE_H
+#define _UCLIBC_PAGE_H
+
+/*
+ * Linux/NDS32 supports 4k and 8k pages (build time).
+ *
+ * Although uClibc determines page size dynamically from kernel's auxv
+ * still the generic code needs a fall back
+ *  _dl_pagesize = auxvt[AT_PAGESZ].a_un.a_val ? : PAGE_SIZE
+ */
+
+#include <features.h>
+
+#if defined(__CONFIG_NDS32_PAGE_SIZE_8K__)
+#define PAGE_SHIFT		13
+#else
+#define PAGE_SHIFT		12
+#endif
+
+#define PAGE_SIZE	(1UL << PAGE_SHIFT)
+#define PAGE_MASK	(~(PAGE_SIZE-1))
+
+/* TBD: fix this with runtime value for a PAGE_SIZE agnostic uClibc */
+#define MMAP2_PAGE_SHIFT PAGE_SHIFT
+
+#endif /* _UCLIBC_PAGE_H */