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, 271 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/nds32/sysdep.h b/libc/sysdeps/linux/nds32/sysdep.h
new file mode 100644
index 000000000..7472a99d4
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/sysdep.h
@@ -0,0 +1,271 @@
+//#include <sysdeps/generic/sysdep.h>
+#ifdef	__ASSEMBLER__
+/* Define an entry point visible from C.  */
+#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)                      \
+  .align 2;                              \
+  .globl C_SYMBOL_NAME(name);            \
+  .func  C_SYMBOL_NAME(name);            \
+  .type  C_SYMBOL_NAME(name), @function; \
+C_SYMBOL_NAME(name):
+#endif
+
+#undef END
+#define END(name) \
+  .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
+	#undef NO_UNDERSCORES
+	#define NO_UNDERSCORES
+#endif
+
+#ifdef NO_UNDERSCORES
+	#define syscall_error __syscall_error
+#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);	\
+	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;			\
+  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;                       \
+  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
+
+
+#define PSEUDO_NOERRNO(name, syscall_name, args) \
+  ENTRY(name);                                   \
+  __do_syscall(syscall_name);
+
+#undef PSEUDO_END
+#define PSEUDO_END(sym)				\
+	SYSCALL_ERROR_HANDLER			\
+	END(sym)
+
+#undef PSEUDO_END_ERRVAL
+#define PSEUDO_END_ERRVAL(sym) END(sym)
+
+#define PSEUDO_ERRVAL(name, syscall_name, args) PSEUDO_NOERRNO(name, syscall_name, args)
+
+#define ret_ERRVAL 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
+	#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;				\
+				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__ */