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, 101 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/nds32/mmap.S b/libc/sysdeps/linux/nds32/mmap.S
new file mode 100644
index 000000000..351d1c502
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/mmap.S
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1998, 2000, 2003 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; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sys/syscall.h>
+#include <sysdep.h>
+	.text
+
+.globl __mmap
+ENTRY (__mmap)
+
+#ifdef PIC
+.pic
+#endif
+
+   // reserve space for r0, r1
+#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP)
+#else
+   addi  $sp, $sp, -8
+#endif
+   // change to units  of the  system  page  size
+   srli $r5, $r5, 0xc
+
+   syscall SYS_ify(mmap2)
+#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP)
+#else
+   addi  $sp, $sp, 8
+#endif
+
+   /* r0 is < -4096 if there was an error.  */
+   bgez $r0, 1f
+   sltsi $r1,$r0,-4096
+   beqz $r1,2f
+
+1:
+   ret
+2:
+#ifdef PIC
+#ifdef __NDS32_N1213_43U1H__
+	! save lp
+	addi	$r2,	$lp,	0
+
+	! set r1 as gp
+	jal	1b
+	sethi	$r1,	hi20(_GLOBAL_OFFSET_TABLE_)
+	ori	$r1,	$r1,	lo12(_GLOBAL_OFFSET_TABLE_+4)
+	add	$r1,	$lp,	$r1
+
+	! restore lp
+	addi	$lp,	$r2,	0
+
+	! r15=SYSCALL_ERROR@PLT
+	sethi $r15, hi20(SYSCALL_ERROR@PLT)
+	ori	$r15,	$r15, lo12(SYSCALL_ERROR@PLT)
+	add	$r15, $r15, $r1
+
+	! jump to SYSCALL_ERROR
+	jr		$r15
+#else
+	! set r1 as gp
+	mfusr $r15, $PC
+	sethi	$r1,	hi20(_GLOBAL_OFFSET_TABLE_+4)
+	ori	$r1,	$r1,	lo12(_GLOBAL_OFFSET_TABLE_+8)
+	add	$r1,	$r1,	$r15
+
+	! r15=SYSCALL_ERROR@PLT
+	sethi $r15, hi20(SYSCALL_ERROR@PLT)
+	ori	$r15,	$r15, lo12(SYSCALL_ERROR@PLT)
+	add	$r15, $r15, $r1
+
+	! jump to SYSCALL_ERROR
+	jr		$r15
+#endif
+#else
+	j SYSCALL_ERROR
+#endif
+
+ret
+
+PSEUDO_END (__mmap)
+
+weak_alias (__mmap, mmap)
+libc_hidden_def(mmap)