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, 107 insertions, 214 deletions

diff --git a/libc/sysdeps/linux/nds32/sysdep.h b/libc/sysdeps/linux/nds32/sysdep.h
index 7472a99d4..340797858 100644
--- a/libc/sysdeps/linux/nds32/sysdep.h
+++ b/libc/sysdeps/linux/nds32/sysdep.h
@@ -1,148 +1,96 @@
-//#include <sysdeps/generic/sysdep.h>
+/*
+ * Copyright (C) 2016-2017 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _LINUX_NDS32_SYSDEP_H
+#define _LINUX_NDS32_SYSDEP_H 1
+
+#include <common/sysdep.h>
+
 #ifdef	__ASSEMBLER__
 /* Define an entry point visible from C.  */
-#ifdef PIC
-#define ENTRY(name)                      \
+# ifdef PIC
+# define ENTRY(name)                      \
   .pic										\
   .align 2;                              \
   .globl C_SYMBOL_NAME(name);            \
   .func  C_SYMBOL_NAME(name);            \
   .type  C_SYMBOL_NAME(name), @function; \
-C_SYMBOL_NAME(name):
-#else
-#define ENTRY(name)                      \
+C_SYMBOL_NAME(name):			\
+	        cfi_startproc;
+
+# else
+# define ENTRY(name)                      \
   .align 2;                              \
   .globl C_SYMBOL_NAME(name);            \
   .func  C_SYMBOL_NAME(name);            \
   .type  C_SYMBOL_NAME(name), @function; \
-C_SYMBOL_NAME(name):
-#endif
+C_SYMBOL_NAME(name):			\
+	        cfi_startproc;
+# endif
 
 #undef END
 #define END(name) \
+  cfi_endproc;        \
   .endfunc;           \
   .size C_SYMBOL_NAME(name), .-C_SYMBOL_NAME(name)
 
 /* If compiled for profiling, call `mcount' at the start of each function.  */
-#ifdef HAVE_ELF
+# ifdef HAVE_ELF
 	#undef NO_UNDERSCORES
 	#define NO_UNDERSCORES
-#endif
+# endif
 
-#ifdef NO_UNDERSCORES
+# ifdef NO_UNDERSCORES
 	#define syscall_error __syscall_error
-#endif
+# endif
 
 #define SYS_ify(syscall_name)  (__NR_##syscall_name)
 
 #define __do_syscall(syscall_name)		\
   syscall	SYS_ify(syscall_name);
 
-#define SYSCALL_ERROR_HANDLER
-#define SYSCALL_ERROR __syscall_error
-
-
-#ifdef PIC
-#ifdef __NDS32_N1213_43U1H__
-#ifdef NDS_ABI_V0
-#define PSEUDO(name, syscall_name, args)	\
-  .pic;										\
-  .align 2;					\
-  1:	ret;	\
-  99:	addi	$r0,	$lp,	0;	\
-	jal	1b;	\
-	sethi	$r1,	hi20(_GLOBAL_OFFSET_TABLE_);	\
-	ori	$r1,	$r1,	lo12(_GLOBAL_OFFSET_TABLE_+4);	\
-	add	$r1,	$lp,	$r1;	\
-	addi	$lp,	$r0,	0;	\
-	sethi $r15, hi20(SYSCALL_ERROR@PLT);	\
-	ori	$r15,	$r15, lo12(SYSCALL_ERROR@PLT);	\
-	add	$r15, $r15, $r1;	\
-	jr		$r15;	\
-	nop;                                   	\
-	ENTRY(name);                          	\
-	__do_syscall(syscall_name);            	\
-	bgez $r5, 2f;				\
-	sltsi	$r0, $r5, -4096;		\
-	beqz	$r0, 99b;			\
-  2:
-#else
-#define PSEUDO(name, syscall_name, args)	\
-  .pic;										\
-  .align 2;					\
-  1:	ret;	\
-  99:	addi	$r2,	$lp,	0;	\
-	jal	1b;	\
-	sethi	$r1,	hi20(_GLOBAL_OFFSET_TABLE_);	\
-	ori	$r1,	$r1,	lo12(_GLOBAL_OFFSET_TABLE_+4);	\
-	add	$r1,	$lp,	$r1;	\
-	addi	$lp,	$r2,	0;	\
-	sethi $r15, hi20(SYSCALL_ERROR@PLT);	\
-	ori	$r15,	$r15, lo12(SYSCALL_ERROR@PLT);	\
-	add	$r15, $r15, $r1;	\
-	jr		$r15;	\
-	nop;                                   	\
-	ENTRY(name);                          	\
-	__do_syscall(syscall_name);            	\
-	bgez $r0, 2f;				\
-	sltsi	$r1, $r0, -4096;		\
-	beqz	$r1, 99b;			\
-  2:
-#endif
-#else
-#define PSEUDO(name, syscall_name, args)	\
-  .pic;										\
-  .align 2;					\
-  99:	mfusr $r15, $PC;	\
-	sethi	$r1,	hi20(_GLOBAL_OFFSET_TABLE_ + 4);	\
+# ifdef PIC
+# define PSEUDO(name, syscall_name, args)				\
+  .pic;									\
+  .align 2;								\
+  99:	mfusr $r15, $PC;						\
+	sethi	$r1,	hi20(_GLOBAL_OFFSET_TABLE_ + 4);		\
 	ori	$r1,	$r1,	lo12(_GLOBAL_OFFSET_TABLE_ + 8);	\
-	add	$r1,	$r15,	$r1;	\
-	sethi $r15, hi20(SYSCALL_ERROR@PLT);	\
-	ori	$r15,	$r15, lo12(SYSCALL_ERROR@PLT);	\
-	add	$r15, $r15, $r1;	\
-	jr		$r15;	\
-	nop;                                   	\
-	ENTRY(name);                          	\
-	__do_syscall(syscall_name);            	\
-	bgez $r0, 2f;				\
-	sltsi	$r1, $r0, -4096;		\
-	beqz	$r1, 99b;			\
+	add	$r1,	$r15,	$r1;					\
+	sethi $r15, hi20(SYSCALL_ERROR@PLT);				\
+	ori	$r15,	$r15, 	lo12(SYSCALL_ERROR@PLT);		\
+	add	$r15,	$r15, 	$r1;					\
+	jr	$r15;							\
+	nop;                                   				\
+	ENTRY(name);                          				\
+	__do_syscall(syscall_name);            				\
+	bgez $r0, 2f;							\
+	sltsi	$r1, 	$r0, 	-4096;					\
+	beqz	$r1, 	99b;						\
   2:
-#endif
-#else
-#ifdef OLD2_ABI
-#define PSEUDO(name, syscall_name, args)	\
-  .align 2;					\
-  99:	j SYSCALL_ERROR;                  	\
-	nop;                                   	\
-	ENTRY(name);                          	\
-	__do_syscall(syscall_name);            	\
-        bgez $r5, 2f;                           \
-        sltsi   $r0, $r5, -4096;                \
-        beqz    $r0, 99b;                       \
+# else
+# define PSEUDO(name, syscall_name, args)				\
+  .align 2;								\
+  99:	j SYSCALL_ERROR;                  				\
+	nop;                                   				\
+	ENTRY(name);                          				\
+	__do_syscall(syscall_name);            				\
+        bgez $r0, 2f;                           			\
+        sltsi   $r1, $r0, -4096;                			\
+        beqz    $r1, 99b;                       			\
   2:
-#else
-#define PSEUDO(name, syscall_name, args)	\
-  .align 2;					\
-  99:	j SYSCALL_ERROR;                  	\
-	nop;                                   	\
-	ENTRY(name);                          	\
-	__do_syscall(syscall_name);            	\
-        bgez $r0, 2f;                           \
-        sltsi   $r1, $r0, -4096;                \
-        beqz    $r1, 99b;                       \
-  2:
-#endif
-#endif
+# endif
 
 
-#define PSEUDO_NOERRNO(name, syscall_name, args) \
-  ENTRY(name);                                   \
+#define PSEUDO_NOERRNO(name, syscall_name, args) 			\
+  ENTRY(name);                                   			\
   __do_syscall(syscall_name);
 
 #undef PSEUDO_END
-#define PSEUDO_END(sym)				\
-	SYSCALL_ERROR_HANDLER			\
+#define PSEUDO_END(sym)							\
+	SYSCALL_ERROR_HANDLER						\
 	END(sym)
 
 #undef PSEUDO_END_ERRVAL
@@ -152,120 +100,65 @@ C_SYMBOL_NAME(name):
 
 #define ret_ERRVAL ret
 
-#define ret_NOERRNO ret	
+#define ret_NOERRNO ret
 #if defined NOT_IN_libc
 	#define SYSCALL_ERROR __local_syscall_error
 	#ifdef PIC
-		#ifdef __NDS32_N1213_43U1H__
-			#ifdef NDS_ABI_V0
-				#define SYSCALL_ERROR_HANDLER				\
-				__local_syscall_error:	pushm	$gp, $lp, $sp;				\
-					jal	1f;	\
-					sethi	$gp,	hi20(_GLOBAL_OFFSET_TABLE_);	\
-					ori	$gp,	$gp,	lo12(_GLOBAL_OFFSET_TABLE_+4);	\
-					add	$gp,	$gp,	$lp;	\
-					neg	$r5, $r5;	\
-					push	$r5;				\
-					addi	$sp,	$sp, -28; \
-					bal	C_SYMBOL_NAME(__errno_location@PLT);	\
-					addi	$sp,	$sp, 28; \
-					pop	$r1;			\
-					swi	$r1, [$r5];				\
-					li		$r5, -1;				\
-					popm	$gp, $lp, $sp;				\
-				1:	ret;
-			#else
-				#define SYSCALL_ERROR_HANDLER				\
-					__local_syscall_error:	pushm	$gp, $lp, $sp;				\
-						jal	1f;	\
-						sethi	$gp,	hi20(_GLOBAL_OFFSET_TABLE_);	\
-						ori	$gp,	$gp,	lo12(_GLOBAL_OFFSET_TABLE_+4);	\
-						add	$gp,	$gp,	$lp;	\
-						neg	$r0, $r0;	\
-						push	$r0;				\
-					#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP) \
-					        addi    $sp,    $sp, -4; \
-					#else \
-						addi	$sp,	$sp, -28; \
-					#endif \
-						bal	C_SYMBOL_NAME(__errno_location@PLT);	\
-					#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP) \
-					        addi    $sp,    $sp, 4; \
-					#else \
-						addi	$sp,	$sp, 28; \
-					#endif \
-						pop	$r1;			\
-						swi	$r1, [$r0];				\
-						li		$r0, -1;				\
-						popm	$gp, $lp, $sp;				\
-					1:	ret;
-			#endif
-		#else
-			#define SYSCALL_ERROR_HANDLER				\
-				__local_syscall_error:	pushm	$gp, $lp, $sp;				\
-					mfusr $r15, $PC;	\
-					sethi	$gp,	hi20(_GLOBAL_OFFSET_TABLE_+4);	\
-					ori	$gp,	$gp,	lo12(_GLOBAL_OFFSET_TABLE_+8);	\
-					add	$gp,	$gp,	$r15;	\
-					neg	$r0, $r0;	\
-					push	$r0;				\
-					#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP) \
-					        addi    $sp,    $sp, -4; \
-					#else \
-						addi	$sp,	$sp, -28; \
-					#endif \
-					bal	C_SYMBOL_NAME(__errno_location@PLT);	\
-					#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP) \
-					        addi    $sp,    $sp, 4; \
-					#else \
-						addi	$sp,	$sp, 28; \
-					#endif \
-					pop	$r1;			\
-					swi	$r1, [$r0];				\
-					li		$r0, -1;				\
-					popm	$gp, $lp, $sp;				\
-				1:	ret;
-		#endif
+		#define SYSCALL_ERROR_HANDLER						\
+			__local_syscall_error:						\
+				pushm	$gp, 	$lp;					\
+			        cfi_adjust_cfa_offset(8)				\
+			        cfi_rel_offset(gp, 0)					\
+			        cfi_rel_offset(lp, 4)					\
+				mfusr 	$r15, 	$PC;					\
+				sethi	$gp,	hi20(_GLOBAL_OFFSET_TABLE_+4);		\
+				ori	$gp,	$gp,	lo12(_GLOBAL_OFFSET_TABLE_+8);	\
+				add	$gp,	$gp,	$r15;				\
+				neg	$r0, 	$r0;					\
+				push	$r0;						\
+			        cfi_adjust_cfa_offset(4)				\
+			        cfi_rel_offset(r0, 0)					\
+				addi    $sp,    $sp, 	-4; 			\
+				bal	C_SYMBOL_NAME(__errno_location@PLT);		\
+				addi    $sp,    $sp, 	4; 			\
+				pop	$r1;						\
+			        cfi_adjust_cfa_offset(-4);                      	\
+			        cfi_restore(r1);                                	\
+				swi	$r1,	[$r0];					\
+				li	$r0,	-1;					\
+				popm	$gp,	$lp;					\
+			        cfi_adjust_cfa_offset(-8);                      	\
+			        cfi_restore(lp);                                	\
+			        cfi_restore(gp);  					\
+			1:	ret;
 	#else
-		#ifdef NDS_ABI_V0
-			#define SYSCALL_ERROR_HANDLER	\
-			__local_syscall_error:	push	$lp;				\
-				neg	$r5, $r5;	\
-				push	$r5;				\
-				addi	$sp,	$sp, -28; \
-				bal	C_SYMBOL_NAME(__errno_location);	\
-				addi	$sp,	$sp, 28; \
-				pop	$r1;			\
-				swi	$r1, [$r5];				\
-				li		$r5, -1;				\
-				pop	$lp;				\
+		#define SYSCALL_ERROR_HANDLER						\
+			__local_syscall_error:						\
+				push	$lp;						\
+			        cfi_adjust_cfa_offset(4)				\
+			        cfi_rel_offset(lp, 0)					\
+				neg	$r0,	$r0;					\
+				push	$r0;						\
+			        cfi_adjust_cfa_offset(4)				\
+			        cfi_rel_offset(r0, 0)					\
+				addi    $sp,    $sp, 	-4; 			\
+				bal	C_SYMBOL_NAME(__errno_location);		\
+				addi    $sp,    $sp, 	4; 			\
+				pop	$r1;						\
+			        cfi_adjust_cfa_offset(-4);                      	\
+			        cfi_restore(r1);                                	\
+				swi	$r1,	[$r0];					\
+				li	$r0,	-1;					\
+				pop	$lp;						\
+			        cfi_adjust_cfa_offset(-4);                      	\
+			        cfi_restore(lp);                                	\
 				ret;
-		#else
-			#define SYSCALL_ERROR_HANDLER	\
-			__local_syscall_error:	push	$lp;				\
-				neg	$r0, $r0;	\
-				push	$r0;				\
-				#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP) \
-				        addi    $sp,    $sp, -4; \
-				#else \
-					addi	$sp,	$sp, -28; \
-				#endif \
-				bal	C_SYMBOL_NAME(__errno_location);	\
-				#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP) \
-				        addi    $sp,    $sp, 4; \
-				#else \
-					addi	$sp,	$sp, 28; \
-				#endif \
-				pop	$r1;			\
-				swi	$r1, [$r0];				\
-				li		$r0, -1;				\
-				pop	$lp;				\
-				ret;
-		#endif
 	#endif
 
 #else
 	#define SYSCALL_ERROR_HANDLER
 	#define SYSCALL_ERROR __syscall_error
 #endif
+
 #endif	/* __ASSEMBLER__ */
+#endif //_LINUX_NDS32_SYSDEP_H