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>

3 files changed, 167 insertions, 0 deletions

diff --git a/libc/string/nds32/Makefile b/libc/string/nds32/Makefile
new file mode 100644
index 000000000..0a95346fd
--- /dev/null
+++ b/libc/string/nds32/Makefile
@@ -0,0 +1,13 @@
+# Makefile for uClibc
+#
+# Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
+#
+# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+#
+
+top_srcdir:=../../../
+top_builddir:=../../../
+all: objs
+include $(top_builddir)Rules.mak
+include ../Makefile.in
+include $(top_srcdir)Makerules
diff --git a/libc/string/nds32/memcpy.S b/libc/string/nds32/memcpy.S
new file mode 100644
index 000000000..4f285b5ee
--- /dev/null
+++ b/libc/string/nds32/memcpy.S
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sysdep.h>
+!==========================================================
+!  void *memcpy(void *dst, const void *src, int n);
+!
+!        dst: $r0
+!        src: $r1
+!        n  : $r2
+!        ret: $r0 - pointer to the memory area dst.
+!==========================================================
+.weak memcpy
+ENTRY(memcpy)
+	move    $r5, $r0
+	beq     $r0, $r1, .Lquit_memcpy
+	beqz    $r2, .Lquit_memcpy
+	srli	$r3, $r2, #5			! check if len < cache-line size 32
+	beqz	$r3, .Lword_copy_entry
+	andi	$r4, $r0, #0x3			! check byte-align
+	beqz	$r4, .Lunalign_word_copy_entry
+
+	addi    $r4, $r4, #-4
+	abs		$r4, $r4				! check how many un-align byte to copy
+	sub		$r2, $r2, $r4			! update $R2
+
+.Lunalign_byte_copy:
+	lbi.bi	$r3, [$r1], #1
+	addi	$r4, $r4, #-1
+	sbi.bi	$r3, [$r0], #1
+	bnez	$r4, .Lunalign_byte_copy
+	beqz	$r2, .Lquit_memcpy
+
+.Lunalign_word_copy_entry:
+	andi	$r3, $r0, 0x1f			! check cache-line unaligncount
+	beqz	$r3, .Lcache_copy
+
+	addi	$r3, $r3, #-32
+	abs		$r3, $r3
+	sub		$r2, $r2, $r3			! update $R2
+
+.Lunalign_word_copy:
+	lmw.bim	$r4, [$r1], $r4
+	addi	$r3, $r3, #-4
+	smw.bim	$r4, [$r0], $r4
+	bnez	$r3, .Lunalign_word_copy
+	beqz	$r2, .Lquit_memcpy
+
+	addi	$r3, $r2, #-32			! to check $r2 < cache_line, than go to .Lword_copy
+	bltz	$r3, .Lword_copy_entry
+.Lcache_copy:
+	srli	$r3, $r2, #5
+	beqz	$r3, .Lword_copy_entry
+	pushm	$r6, $r13
+.L3:
+	lmw.bim	$r6, [$r1], $r13
+	addi	$r3, $r3, #-1
+	smw.bim	$r6, [$r0], $r13
+	bnez	$r3, .L3
+	popm	$r6, $r13
+
+.Lword_copy_entry:
+	andi	$r2, $r2, #31
+	beqz	$r2, .Lquit_memcpy
+	srli	$r3, $r2, #2
+	beqz	$r3, .Lbyte_copy
+.Lword_copy:
+	lmw.bim	$r4, [$r1], $r4
+	addi	$r3, $r3, #-1
+	smw.bim	$r4, [$r0], $r4
+	bnez	$r3, .Lword_copy
+	andi	$r2, $r2, #3
+	beqz	$r2, .Lquit_memcpy
+
+.Lbyte_copy:
+	lbi.bi	$r3, [$r1], #1
+	addi	$r2, $r2, #-1
+	sbi.bi	$r3, [$r0], #1
+	bnez	$r2, .Lbyte_copy
+
+.Lquit_memcpy:
+	move	$r0, $r5
+	ret
+
+END(memcpy)
+libc_hidden_def(memcpy)
diff --git a/libc/string/nds32/memset.S b/libc/string/nds32/memset.S
new file mode 100644
index 000000000..edd15a410
--- /dev/null
+++ b/libc/string/nds32/memset.S
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/*  Copyright (C) 1998, 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; if not, write to the Free
+ *  Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ *  02111-1307 USA.
+ */
+
+#include <features.h>
+#include <sysdep.h>
+!==========================================================
+!  void *memset(void *dst, int val, int len);
+!
+!        dst: $r0
+!        val: $r1
+!        len: $r2
+!        ret: $r0 - pointer to the memory area dst.
+!==========================================================
+.weak memset
+ENTRY(memset)
+	move	$r5, $r0	        ! Return value
+	beqz    $r2, .Lend_memset   ! Exit when len = 0
+	srli	$r3, $r2, 2	        ! r3 is how many words to copy
+	andi	$r2, $r2, 3	        ! How many bytes are less than a word
+	beqz	$r3, .Lbyte_set	    ! When n is less than a word
+
+    ! set r1 from to abababab
+	andi    $r1, $r1, 0x00ff        ! r1 = 000000ab
+	slli    $r4, $r1, 8             ! r4 = 0000ab00
+	or      $r1, $r1, $r4           ! r1 = 0000abab
+	slli    $r4, $r1, 16            ! r4 = abab0000
+	or      $r1, $r1, $r4           ! r1 = abababab
+
+.Lword_set:
+	addi	$r3, $r3, -1	        ! How many words left to copy
+	smw.bim $r1, [$r5], $r1	    	! Copy the word to det
+	bnez    $r3, .Lword_set			! Still words to set, continue looping
+	beqz	$r2, .Lend_memset		! No left byte to set
+
+.Lbyte_set:
+	! Less than 4 bytes left to set
+	addi	$r2, $r2, -1		! Decrease len by 1
+	sbi.p	$r1, [$r5], 1		! Set data of the next byte to r1
+	bnez	$r2, .Lbyte_set		! Still bytes left to set
+
+.Lend_memset:
+	ret
+
+END(memset)
+libc_hidden_def(memset)