nds32: add NPTL/TLS, *context function, libm changes and code cleanup

This commit includes following features.
1. Support NPTL/TLS
2. Add libm function which is used to handle FP rounding and excpetions
   (ex: fclrexcpt,fedisblxcpti,feenablxcpt... )
3. Add *context function for operating user context
   (ex: setcontext,getcontext,makecontext... )
4. Change the return flow from signal handler
5. Cleanup of old code

The testsuite only has 2 errors, tst-cpuclock1 and tst-cputimer1,
which are related to timing accuracy. (math and locale tests are disabled)

Signed-off-by: Vincent Ren-Wei Chen <vincentc@andestech.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/nds32/syscall.c b/libc/sysdeps/linux/nds32/syscall.c
new file mode 100644
index 000000000..2c949ef3a
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/syscall.c
@@ -0,0 +1,28 @@
+/*
+ *  Copyright (C) 2017 Andes Technology, Inc.
+ *  Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <errno.h>
+#include <stdarg.h>
+#include <sys/syscall.h>
+#include <sysdep.h>
+#include <unistd.h>
+long int syscall (long int __sysno, ...)
+{
+
+	int result;
+	unsigned long arg1,arg2,arg3,arg4,arg5,arg6;
+	va_list arg;
+	va_start (arg, __sysno);
+	arg1 = va_arg (arg, unsigned long);
+	arg2 = va_arg (arg, unsigned long);
+	arg3 = va_arg (arg, unsigned long);
+	arg4 = va_arg (arg, unsigned long);
+	arg5 = va_arg (arg, unsigned long);
+	arg6 = va_arg (arg, unsigned long);
+	va_end (arg);
+        __asm__ volatile ( "" ::: "memory" );
+	result = INLINE_SYSCALL(syscall,7,__sysno,arg1,arg2,arg3,arg4,arg5,arg6);
+	return result;
+}