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, 26 insertions, 91 deletions

diff --git a/libc/sysdeps/linux/nds32/sys/ucontext.h b/libc/sysdeps/linux/nds32/sys/ucontext.h
index 4dca27fd5..0d7422aab 100644
--- a/libc/sysdeps/linux/nds32/sys/ucontext.h
+++ b/libc/sysdeps/linux/nds32/sys/ucontext.h
@@ -1,7 +1,20 @@
-/*
- * Copyright (C) 2016 Andes Technology, Inc.
- * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
- */
+/* Copyright (C) 1998, 1999, 2001, 2006 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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, see
+   <http://www.gnu.org/licenses/>.  */
+
 
 #ifndef _SYS_UCONTEXT_H
 #define _SYS_UCONTEXT_H	1
@@ -10,103 +23,25 @@
 #include <signal.h>
 #include <sys/procfs.h>
 
-typedef int greg_t;
-
-/* Number of general registers.  */
-#define NGREG	32
-
-/* Container for all general registers.  */
-typedef elf_gregset_t gregset_t;
+/* We need the signal context definitions even if they are not used
+ *    included in <signal.h>.  */
+#include <bits/sigcontext.h>
 
-/* Number of each register is the `gregset_t' array.  */
-enum
-{
-  R0 = 0,
-#define R0	R0
-  R1 = 1,
-#define R1	R1
-  R2 = 2,
-#define R2	R2
-  R3 = 3,
-#define R3	R3
-  R4 = 4,
-#define R4	R4
-  R5 = 5,
-#define R5	R5
-  R6 = 6,
-#define R6	R6
-  R7 = 7,
-#define R7	R7
-  R8 = 8,
-#define R8	R8
-  R9 = 9,
-#define R9	R9
-  R10 = 10,
-#define R10	R10
-  R11 = 11,
-#define R11	R11
-  R12 = 12,
-#define R12	R12
-  R13 = 13,
-#define R13	R13
-  R14 = 14,
-#define R14	R14
-  R15 = 15,
-#define R15	R15
-  R16 = 16,
-#define R16     R16
-  R17 = 17,
-#define R17     R17
-  R18 = 18,
-#define R18     R18
-  R19 = 19,
-#define R19     R19
-  R20 = 20,
-#define R20     R20
-  R21 = 21,
-#define R21     R21
-  R22 = 22,
-#define R22     R22
-  R23 = 23,
-#define R23     R23
-  R24 = 24,
-#define R24     R24
-  R25 = 25,
-#define R25     R25
-  R26 = 26,
-#define R26     R26
-  R27 = 27,
-#define R27     R27
-  R28 = 28,
-#define R28     R28
-  R29 = 29,
-#define R29     R29
-  R30 = 30,
-#define R30     R30
-  R31 = 31
-#define R31     R31
 
-};
+/* Context to describe whole processor state.  This only describes
+   the core registers; coprocessor registers get saved elsewhere
+   (e.g. in uc_regspace, or somewhere unspecified on the stack
+   during non-RT signal handlers).  */
+typedef struct sigcontext mcontext_t;
 
-/* Structure to describe FPU registers.  */
-typedef elf_fpregset_t	fpregset_t;
-
-/* Context to describe whole processor state.  */
-typedef struct
-  {
-    gregset_t gregs;
-    fpregset_t fpregs;
-  } mcontext_t;
 
 /* Userlevel context.  */
 typedef struct ucontext
   {
     unsigned long int uc_flags;
     struct ucontext *uc_link;
-    __sigset_t uc_sigmask;
     stack_t uc_stack;
     mcontext_t uc_mcontext;
-    long int uc_filler[5];
+    __sigset_t uc_sigmask;
   } ucontext_t;
-
 #endif /* sys/ucontext.h */