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, 87 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/nds32/vfork.S b/libc/sysdeps/linux/nds32/vfork.S
new file mode 100644
index 000000000..c955359fb
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/vfork.S
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1999, 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; 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>
+
+#define _ERRNO_H    1
+
+/* Clone the calling process, but without copying the whole address space.
+   The calling process is suspended until the new process exits or is
+   replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
+   and the process ID of the new process to the old process.  */
+
+ENTRY (__vfork)
+#ifdef PIC
+.pic
+#endif
+
+#ifdef __NR_vfork
+
+    syscall __NR_vfork
+    bltz $r0, 2f
+1:
+    ret
+2:
+    sltsi $r1, $r0, -4096
+    bnez $r1, 1b;
+
+#  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
+	#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
+	#endif
+
+	! r15=C_SYMBOL_NAME(__syscall_error)@PLT
+	sethi $r15, hi20(C_SYMBOL_NAME(__syscall_error)@PLT)
+	ori	$r15,	$r15, lo12(C_SYMBOL_NAME(__syscall_error)@PLT)
+	add	$r15, $r15, $r1
+
+	! jump to SYSCALL_ERROR
+	jr		$r15
+#  else
+	j C_SYMBOL_NAME(__syscall_error)
+#  endif
+
+#else
+# error "__NR_vfork not available"
+#endif
+
+PSEUDO_END (__vfork)
+weak_alias (__vfork, vfork)
+libc_hidden_def(vfork)