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, 23 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/nds32/prctl.c b/libc/sysdeps/linux/nds32/prctl.c
new file mode 100644
index 000000000..b20f4ca79
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/prctl.c
@@ -0,0 +1,23 @@
+/*
+ *  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 <sysdep.h>
+#include <sys/prctl.h>
+#include <sys/syscall.h>
+
+int prctl (int __option, ...)
+{
+	unsigned long arg1,arg2,arg3,arg4;
+	va_list arg;
+	va_start (arg, __option);
+	arg1 = va_arg (arg, unsigned long);
+	arg2 = va_arg (arg, unsigned long);
+	arg3 = va_arg (arg, unsigned long);
+	arg4 = va_arg (arg, unsigned long);
+	va_end (arg);
+	return INLINE_SYSCALL(prctl,5,__option,arg1,arg2,arg3,arg4);
+}