From d4ef8a6368e8e5b22808e3df64306418f1971ba9 Mon Sep 17 00:00:00 2001
From: Corinna Vinschen <corinna@vinschen.de>
Date: Mon, 15 Dec 2014 13:30:07 +0000
Subject: [PATCH] 	* libgloss/nds32/_exit.S: Finish with an infinite loop
 in _exit. 	* libgloss/nds32/_getpid.S: Don't issue _getpid system call,
 it is 	always successful. 	* libgloss/nds32/_gettimeofday.S: No error for
 _gettimeofday is defined 	in SYS_geterr handler. 	*
 libgloss/nds32/_isatty.S: No error for _isatty is defined in 	SYS_geterr
 handler. 	* libgloss/nds32/_kill.S: Alway fail. errno = EINVAL. 	*
 libgloss/nds32/_link.S: Alway fail. errno =  EMLINK. 	*
 libgloss/nds32/_times.S: Alway fail. errno = EACCES. 	*
 libgloss/nds32/_unlink.S: fix copy and paste error. 	*
 libgloss/nds32/crt0.S: Add pre_c_init, post_c_init, arg_init. 	*
 libgloss/nds32/crt1.S: Add pre_c_init, post_c_init, arg_init. 	*
 libgloss/nds32/syscall_extra.h: Re-format. 	* libgloss/nds32/vh.h: Add
 more virtual hosting number.

---
 libgloss/ChangeLog             | 18 +++++++
 libgloss/nds32/_exit.S         | 20 +++----
 libgloss/nds32/_getpid.S       | 17 +++---
 libgloss/nds32/_gettimeofday.S | 10 +++-
 libgloss/nds32/_isatty.S       | 26 ++++++++-
 libgloss/nds32/_kill.S         | 25 ++++++---
 libgloss/nds32/_link.S         | 23 +++++---
 libgloss/nds32/_times.S        | 23 +++++---
 libgloss/nds32/_unlink.S       |  2 +-
 libgloss/nds32/crt0.S          | 94 +++++++++++++++++++++++++++------
 libgloss/nds32/crt1.S          | 96 ++++++++++++++++++++++++++++------
 libgloss/nds32/syscall_extra.h |  9 ++--
 libgloss/nds32/vh.h            |  3 ++
 13 files changed, 285 insertions(+), 81 deletions(-)

diff --git a/libgloss/ChangeLog b/libgloss/ChangeLog
index 0f236a7e7..b1293fb4e 100644
--- a/libgloss/ChangeLog
+++ b/libgloss/ChangeLog
@@ -1,3 +1,21 @@
+2014-12-15  Nick Hung  <nick@andestech.com>
+
+	* libgloss/nds32/_exit.S: Finish with an infinite loop in _exit.
+	* libgloss/nds32/_getpid.S: Don't issue _getpid system call, it is
+	always successful.
+	* libgloss/nds32/_gettimeofday.S: No error for _gettimeofday is defined
+	in SYS_geterr handler.
+	* libgloss/nds32/_isatty.S: No error for _isatty is defined in
+	SYS_geterr handler.
+	* libgloss/nds32/_kill.S: Alway fail. errno = EINVAL.
+	* libgloss/nds32/_link.S: Alway fail. errno =  EMLINK.
+	* libgloss/nds32/_times.S: Alway fail. errno = EACCES.
+	* libgloss/nds32/_unlink.S: fix copy and paste error.
+	* libgloss/nds32/crt0.S: Add pre_c_init, post_c_init, arg_init.
+	* libgloss/nds32/crt1.S: Add pre_c_init, post_c_init, arg_init.
+	* libgloss/nds32/syscall_extra.h: Re-format.
+	* libgloss/nds32/vh.h: Add more virtual hosting number.
+
 2014-12-11  Anthony Green  <green@moxielogic.com>
 
 	* moxie/configure: Rebuilt.
diff --git a/libgloss/nds32/_exit.S b/libgloss/nds32/_exit.S
index 8154fbed5..1a73fa20a 100644
--- a/libgloss/nds32/_exit.S
+++ b/libgloss/nds32/_exit.S
@@ -27,22 +27,18 @@ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
-#ifdef __NDS32_VH__
-
 #include "vh.h"
-.extern _impure_ptr
-TYPE3 _exit, VH_EXIT
-
-#else	/* not __NDS32_VH__ */
-
 #include "../syscall.h"
-#include "syscall_extra.h"
-	.section .text
+	.text
 	.global	_exit
 	.type	_exit, @function
-	.align 2
+	.align	2
 _exit:
+#ifdef __NDS32_VH__
+	BREAK	VH_EXIT		/* Generate_Exception(Breakpoint);  */
+#else
 	syscall	SYS_exit	/* Make syscall 'SYS_exit'.  */
+#endif
+.L_infinite_loop:
+	b	.L_infinite_loop
 	.size	_exit, .-_exit
-
-#endif	/* not __NDS32_VH__ */
diff --git a/libgloss/nds32/_getpid.S b/libgloss/nds32/_getpid.S
index 086be8461..c8662d20d 100644
--- a/libgloss/nds32/_getpid.S
+++ b/libgloss/nds32/_getpid.S
@@ -28,10 +28,13 @@ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
-#ifndef __NDS32_VH__
-
-#include "../syscall.h"
-#include "syscall_extra.h"
-SYS_WRAPPER _getpid, SYS_getpid
-
-#endif	/* not __NDS32_VH__ */
+	.text
+	.global	_getpid
+	.type	_getpid, @function
+	.align	2
+_getpid:
+	/* The getpid() function shall always be successful and
+	   no return value is reserved to indicate an error.  */
+	movi	$r0, 1	/* A minimal implementation, success.  */
+	ret
+	.size   _getpid, .-_getpid
diff --git a/libgloss/nds32/_gettimeofday.S b/libgloss/nds32/_gettimeofday.S
index adc5f6847..e78bd5e19 100644
--- a/libgloss/nds32/_gettimeofday.S
+++ b/libgloss/nds32/_gettimeofday.S
@@ -30,13 +30,19 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifdef __NDS32_VH__
 
 #include "vh.h"
-.extern _impure_ptr
 TYPE3 _gettimeofday, VH_GETTIMEOFDAY
 
 #else	/* not __NDS32_VH__ */
 
 #include "../syscall.h"
 #include "syscall_extra.h"
-SYS_WRAPPER _gettimeofday, SYS_gettimeofday
+	.text
+	.global	_gettimeofday
+	.type	_gettimeofday, @function
+	.align	2
+_gettimeofday:
+	syscall	SYS_gettimeofday
+	ret
+	.size   _gettimeofday, .-_gettimeofday
 
 #endif	/* not __NDS32_VH__ */
diff --git a/libgloss/nds32/_isatty.S b/libgloss/nds32/_isatty.S
index c90028afc..37776ed7d 100644
--- a/libgloss/nds32/_isatty.S
+++ b/libgloss/nds32/_isatty.S
@@ -27,6 +27,15 @@ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
+/*
+  SYNOPSIS
+    #include <unistd.h>
+    int isatty(int fildes);
+  RETURN VALUE
+    The isatty() function shall return 1 if fildes is associated with
+    a terminal;	 otherwise, it shall return 0 and may set errno
+    to indicate the error.
+*/
 #ifdef __NDS32_VH__
 
 #include "vh.h"
@@ -37,6 +46,21 @@ TYPE0 _isatty, VH_ISATTY
 
 #include "../syscall.h"
 #include "syscall_extra.h"
-SYS_WRAPPER _isatty, SYS_isatty
+	.text
+	.global	_isatty
+	.type	_isatty, @function
+	.align	2
+_isatty:
+	syscall	SYS_isatty	/* Make syscall with SWID=`SYS_isatty'.
+				   Reture value `0' stored in $r0 means
+				   there is something wrong.  */
+	bnez	$r0, 1f		/* Branch if success.  */
+	syscall	SYS_geterr	/* There is something wrong.  */
+	l.w     $r15, _impure_ptr
+	swi     $r0, [$r15]     /* Set errno.  */
+	move	$r0, #0
+1:
+	ret
+	.size   _isatty, .-_isatty
 
 #endif	/* not __NDS32_VH__ */
diff --git a/libgloss/nds32/_kill.S b/libgloss/nds32/_kill.S
index 69d8b41c6..bb8c6ebd3 100644
--- a/libgloss/nds32/_kill.S
+++ b/libgloss/nds32/_kill.S
@@ -27,11 +27,20 @@ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
-
-#ifndef __NDS32_VH__
-
-#include "../syscall.h"
-#include "syscall_extra.h"
-SYS_WRAPPER _kill, SYS_kill
-
-#endif	/* not __NDS32_VH__ */
+/* Upon successful completion, 0 shall be returned. Otherwise,
+   -1 shall be returned and errno set to indicate the error.  */
+	.extern	_impure_ptr	/* The first element is _errno.  */
+	.text
+	.global	_kill
+	.type	_kill, @function
+	.align	2
+_kill:
+	/* A minimal implementation has no concept of either signals,
+	   nor of processes to receive those signals. So this function
+	   should always fail with an appropriate value in errno.  */
+	movi	$r0, #22	/* EINVAL: Invalid argument  */
+	l.w     $r15, _impure_ptr
+	swi     $r0, [$r15]
+	movi	$r0, -1		/* Set return value to -1.  */
+	ret
+	.size   _kill, .-_kill
diff --git a/libgloss/nds32/_link.S b/libgloss/nds32/_link.S
index 15016fcc1..7f6b7f0fa 100644
--- a/libgloss/nds32/_link.S
+++ b/libgloss/nds32/_link.S
@@ -27,10 +27,19 @@ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
-#ifndef __NDS32_VH__
-
-#include "../syscall.h"
-#include "syscall_extra.h"
-SYS_WRAPPER _link, SYS_link
-
-#endif	/* not __NDS32_VH__ */
+/* Upon successful completion, 0 shall be returned. Otherwise,
+   -1 shall be returned and errno set to indicate the error.  */
+	.extern	_impure_ptr	/* The first element is _errno.  */
+	.text
+	.global	_link
+	.type	_link, @function
+	.align	2
+_link:
+	/* A minimal implementation has no file system, so this function
+	   must always fail, with an appropriate value set in errno.  */
+	movi	$r0, #31	/* EMLINK: Too many links  */
+	l.w     $r15, _impure_ptr
+	swi     $r0, [$r15]
+	movi	$r0, -1		/* Set return value to -1.  */
+	ret
+	.size   _link, .-_link
diff --git a/libgloss/nds32/_times.S b/libgloss/nds32/_times.S
index 048de6208..3343f315b 100644
--- a/libgloss/nds32/_times.S
+++ b/libgloss/nds32/_times.S
@@ -27,10 +27,19 @@ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
-#ifndef __NDS32_VH__
-
-#include "../syscall.h"
-#include "syscall_extra.h"
-SYS_WRAPPER _times, SYS_times
-
-#endif	/* not __NDS32_VH__ */
+/* If times() fails, (clock_t)-1 shall be returned and errno set
+   to indicate the error.  */
+	.extern	_impure_ptr	/* The first element is _errno.  */
+	.text
+	.global	_times
+	.type	_times, @function
+	.align	2
+_times:
+	/* A minimal implementation need not offer any timing information,
+	   so should always fail with an appropriate value in errno.  */
+	movi	$r0, #13	/* EACCES: Permission denied  */
+	l.w     $r15, _impure_ptr
+	swi     $r0, [$r15]
+	movi	$r0, -1		/* Set return value to -1.  */
+	ret
+	.size   _times, .-_times
diff --git a/libgloss/nds32/_unlink.S b/libgloss/nds32/_unlink.S
index ec251b504..bb5989c3f 100644
--- a/libgloss/nds32/_unlink.S
+++ b/libgloss/nds32/_unlink.S
@@ -32,7 +32,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "vh.h"
 .extern _impure_ptr
-TYPE1 _lseek, VH_LSEEK
+TYPE1 _unlink, VH_UNLINK
 
 #else	/* not __NDS32_VH__ */
 
diff --git a/libgloss/nds32/crt0.S b/libgloss/nds32/crt0.S
index 968b7352b..68a6f76d4 100644
--- a/libgloss/nds32/crt0.S
+++ b/libgloss/nds32/crt0.S
@@ -36,6 +36,8 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ##
 ##==============================================================================
 
+#include "syscall_extra.h"
+
 ##------------------------------------------------------------------------------
 ## Vector table setup
 ##------------------------------------------------------------------------------
@@ -47,6 +49,11 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ##------------------------------------------------------------------------------
 	.section	.text
 	.weak	_SDA_BASE_
+	.weak	_ITB_BASE_
+	.weak	_arg_init
+	.weak	__pre_c_init
+	.weak	__post_c_init
+	.weak	_call_exit
 	.global	_start
 	.type	_start, @function
 	.align	2
@@ -60,8 +67,22 @@ _start:
 	   determined by Linker.  SDA stands for Small Data Access.  */
 	la	$gp, _SDA_BASE_
 
+#if __NDS32_EXT_EX9__
+.L_init_itb:
+	/* Initialization for Instruction Table Base (ITB).
+	   The symbol _ITB_BASE_ is determined by Linker.
+	   Set $ITB only if MSC_CFG.EIT (cr4.b'24) is set.  */
+	mfsr	$r0, $MSC_CFG
+	srli	$r0, $r0, 24
+	andi	$r0, $r0, 0x1
+	beqz	$r0, 1f		/* Fall through ?  */
+	la	$r0, _ITB_BASE_
+	mtusr	$r0, $ITB
+1:
+#endif
+
 .L_init_sp:
-	/* Initialization for stack pointe.  The symbol _stack is defined
+	/* Initialization for stack pointer.  The symbol _stack is defined
 	   in linker script.  Make sure $sp is 8-byte aligned.  */
 	la	$sp, _stack
 #if __NDS32_ISA_V3__
@@ -71,23 +92,33 @@ _start:
 	and	$sp, $sp, $r0
 #endif
 
-#if __NDS32_EX9_EXT__
-.L_init_itb:
-	/* Initialization for Instruction Table Base (ITB).
-	   The symbol $_ITB_BASE_ is determined by Linker.
-	   Set $ITB only if MSC_CFG.EIT (cr4.b'24) is set.  */
-	mfsr    $r0, $MSC_CFG
-	srli    $r0, $r0, 24
-	andi    $r0, $r0, 0x1
-	beqz    $r0, .L_zero_out_bss	/* Fall through ?  */
-	la      $r0, $_ITB_BASE_
-	mtusr   $r0, $ITB
+#if __NDS32_EXT_FPU_SP__ || __NDS32_EXT_FPU_DP__
+.L_init_fpu:
+	/* Initialize FPU
+	   Set FUCOP_CTL.CP0EN (fucpr.b'0).  */
+	mfsr	$r0, $FUCOP_CTL
+	ori	$r0, $r0, 0x1
+	mtsr	$r0, $FUCOP_CTL
+	dsb
+	/* According to [bugzilla #9425], set flush-to-zero mode.
+	   That is, set $FPCSR.DNZ(b'12) = 1.  */
+	FMFCSR	$r0
+	ori	$r0, $r0, 0x1000
+	FMTCSR	$r0
+	dsb
 #endif
 
+.L_pre_c_init:
+	! call __pre_c_init if provided
+	! sample __pre_c_init is in BSP
+	la	$r15, __pre_c_init	! load address of __pre_c_init
+	beqz	$r15, .L_zero_out_bss	! check existence of __pre_c_init
+	jral	$r15			! pre-c-runtime initialization
+
 .L_zero_out_bss:
 	/* Zero out the bss section.
 	   Equivalence C code for follow part:
-	   if (_end == _edata) goto .L_call_main
+	   if (_end == _edata) goto .L_post_c_init
 	   unsinged int *ptr = _edata;
 	   while (ptr != _end)
 	     *ptr++ = 0
@@ -98,21 +129,52 @@ _start:
 	la	$r0, _edata
 	la	$r1, _end
 	movi	$r2, #0
-	beq	$r0, $r1, .L_call_main	/* Branch if no bss.  */
+	beq	$r0, $r1, .L_post_c_init	/* Branch if no bss.  */
 .Lword_clear:
 	swi.bi	$r2, [$r0], #4
 	bne	$r0, $r1, .Lword_clear
 
-.L_call_main:
+.L_post_c_init:
+	! call __post_c_init if provided
+	! no sample __post_c_init is provided
+	la	$r15, __post_c_init	! load address of __post_c_init
+	beqz	$r15, .L_arg_init	! check existence of __post_c_init
+	jral	$r15			! post-c-runtime initialization
+
+.L_arg_init:
+	! argc/argv initialization if necessary
+	la	$r7, _arg_init		! get address of _arg_init
+	beqz	$r7, .L_clean_reg	! if there isn't _arg_init, go main
+	addi	$sp, $sp, -512		! allocate space for command line
+					! and arguments
+	move	$r6, $sp		! r6 = buffer addr of cmd line
+	move	$r0, $r6		! r0 = buffer addr of cmd line
+	syscall	SYS_getcmdline		! get cmd line
+	move	$r0, $r6		! r0 = buffer addr of cmd line
+	addi	$r1, $r6, 256		! r1 = argv
+	jral	$r7			! init argc/argv
+	addi	$r1, $r6, 256		! r1 = argv
+	b	.L_call_main
+
+.L_clean_reg:
 	/* Prepare argc/argv/env for main function.
 	   Since there is no operating system so far,
 	   we set $r0, $r1, and $r2 to be zero.
-	   Note: $r2 already set to zero in line 84.  */
+	   Note: $r2 already set to zero in .L_zero_out_bss: code fragment.  */
 	movi	$r0, 0
 	movi	$r1, 0
+	movi	$r2, 0
+
+.L_call_main:
 	/* Call 'main'.  */
 	bal	main
 
+	/* Call _call_exit.  */
+	! call _call_exit if necessary; default implementation is in crtexit.c
+	la	$r15, _call_exit		! load address of _call_exit
+	beqz	$r15, .L_terminate_program	! no _call_exit? go exit
+	jral	$r15				! _call_exit will never return
+
 .L_terminate_program:
 	/* There are two ways to terminate program:
 	    1. User "syscall 0x1" directly.
diff --git a/libgloss/nds32/crt1.S b/libgloss/nds32/crt1.S
index 2ff2eea6d..ec8b86683 100644
--- a/libgloss/nds32/crt1.S
+++ b/libgloss/nds32/crt1.S
@@ -36,6 +36,8 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ##
 ##==============================================================================
 
+#include "syscall_extra.h"
+
 ##------------------------------------------------------------------------------
 ## Vector table setup
 ##------------------------------------------------------------------------------
@@ -47,6 +49,11 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ##------------------------------------------------------------------------------
 	.section	.text
 	.weak	_SDA_BASE_
+	.weak	_ITB_BASE_
+	.weak	_arg_init
+	.weak	__pre_c_init
+	.weak	__post_c_init
+	.weak	_call_exit
 	.global	_start
 	.type	_start, @function
 	.align	2
@@ -60,8 +67,22 @@ _start:
 	   determined by Linker.  SDA stands for Small Data Access.  */
 	la	$gp, _SDA_BASE_
 
+#if __NDS32_EXT_EX9__
+.L_init_itb:
+	/* Initialization for Instruction Table Base (ITB).
+	   The symbol _ITB_BASE_ is determined by Linker.
+	   Set $ITB only if MSC_CFG.EIT (cr4.b'24) is set.  */
+	mfsr	$r0, $MSC_CFG
+	srli	$r0, $r0, 24
+	andi	$r0, $r0, 0x1
+	beqz	$r0, 1f		/* Fall through ?  */
+	la	$r0, _ITB_BASE_
+	mtusr	$r0, $ITB
+1:
+#endif
+
 .L_init_sp:
-	/* Initialization for stack pointe.  The symbol _stack is defined
+	/* Initialization for stack pointer.  The symbol _stack is defined
 	   in linker script.  Make sure $sp is 8-byte aligned.  */
 	la	$sp, _stack
 #if __NDS32_ISA_V3__
@@ -71,19 +92,29 @@ _start:
 	and	$sp, $sp, $r0
 #endif
 
-#if __NDS32_EX9_EXT__
-.L_init_itb:
-	/* Initialization for Instruction Table Base (ITB).
-	   The symbol $_ITB_BASE_ is determined by Linker.
-	   Set $ITB only if MSC_CFG.EIT (cr4.b'24) is set.  */
-	mfsr    $r0, $MSC_CFG
-	srli    $r0, $r0, 24
-	andi    $r0, $r0, 0x1
-	beqz    $r0, .L_zero_out_bss	/* Fall through ?  */
-	la      $r0, $_ITB_BASE_
-	mtusr   $r0, $ITB
+#if __NDS32_EXT_FPU_SP__ || __NDS32_EXT_FPU_DP__
+.L_init_fpu:
+	/* Initialize FPU
+	   Set FUCOP_CTL.CP0EN (fucpr.b'0).  */
+	mfsr	$r0, $FUCOP_CTL
+	ori	$r0, $r0, 0x1
+	mtsr	$r0, $FUCOP_CTL
+	dsb
+	/* According to [bugzilla #9425], set flush-to-zero mode.
+	   That is, set $FPCSR.DNZ(b'12) = 1.  */
+	FMFCSR	$r0
+	ori	$r0, $r0, 0x1000
+	FMTCSR	$r0
+	dsb
 #endif
 
+.L_pre_c_init:
+	! call __pre_c_init if provided
+	! sample __pre_c_init is in BSP
+	la	$r15, __pre_c_init	! load address of __pre_c_init
+	beqz	$r15, .L_zero_out_bss	! check existence of __pre_c_init
+	jral	$r15			! pre-c-runtime initialization
+
 .L_zero_out_bss:
 	/* Zero out the bss section.
 	   Equivalence C code for follow part:
@@ -97,28 +128,61 @@ _start:
 	 */
 	la	$r0, _edata
 	la	$r1, _end
-	beq	$r0, $r1, .L_call_main	/* Branch if no bss.  */
 	movi	$r2, #0
+	beq	$r0, $r1, .L_cpp_init	/* Branch if no bss.  */
 .Lword_clear:
 	swi.bi	$r2, [$r0], #4
 	bne	$r0, $r1, .Lword_clear
 
-.L_call_main:
+.L_cpp_init:
 	/* Call '_init' to invoke constructors.  */
 	jal	_init
 	/* Register '_fini' into atexit() to invoke destructors when
 	   exit() has been reached.  */
 	la	$r0, _fini
 	jal	atexit
+
+.L_post_c_init:
+	! call __post_c_init if provided
+	! no sample __post_c_init is provided
+	la	$r15, __post_c_init	! load address of __post_c_init
+	beqz	$r15, .L_arg_init	! check existence of __post_c_init
+	jral	$r15			! post-c-runtime initialization
+
+.L_arg_init:
+	! argc/argv initialization if necessary
+	la	$r7, _arg_init		! get address of _arg_init
+	beqz	$r7, .L_clean_reg	! if there isn't _arg_init, go main
+	addi	$sp, $sp, -512		! allocate space for command line
+					! and arguments
+	move	$r6, $sp		! r6 = buffer addr of cmd line
+	move	$r0, $r6		! r0 = buffer addr of cmd line
+	syscall	SYS_getcmdline		! get cmd line
+	move	$r0, $r6		! r0 = buffer addr of cmd line
+	addi	$r1, $r6, 256		! r1 = argv
+	jral	$r7			! init argc/argv
+	addi	$r1, $r6, 256		! r1 = argv
+	b	.L_call_main
+
+.L_clean_reg:
 	/* Prepare argc/argv/env for main function.
 	   Since there is no operating system so far,
-	   we set $r0, $r1, and $r2 to be zero.  */
+	   we set $r0, $r1, and $r2 to be zero.
+	   Note: $r2 already set to zero in .L_zero_out_bss: code fragment.  */
 	movi	$r0, 0
 	movi	$r1, 0
 	movi	$r2, 0
+
+.L_call_main:
 	/* Call 'main'.  */
 	bal	main
 
+	/* Call _call_exit.  */
+	! call _call_exit if necessary; default implementation is in crtexit.c
+	la	$r15, _call_exit		! load address of _call_exit
+	beqz	$r15, .L_terminate_program	! no _call_exit? go exit
+	jral	$r15				! _call_exit will never return
+
 .L_terminate_program:
 	/* There are two ways to terminate program:
 	    1. User "syscall 0x1" directly.
@@ -128,7 +192,7 @@ _start:
 	    Currently, we use option 2 as a solution to follow C99 5.1.2.2.3,
 	    but aware that general exit() will do some cleanup procedures
 	    which may result in large-memory-footprints.  */
-	
+
 	bal	exit
 
 .L_forever_loop:
diff --git a/libgloss/nds32/syscall_extra.h b/libgloss/nds32/syscall_extra.h
index 7af4a4550..7c69489ca 100644
--- a/libgloss/nds32/syscall_extra.h
+++ b/libgloss/nds32/syscall_extra.h
@@ -32,11 +32,12 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 
 /* These are additional syscalls for nds32 target. */
-#define SYS_rename       3001
-#define SYS_isatty       3002
-#define SYS_system       3003
+#define SYS_rename	3001
+#define SYS_isatty	3002
+#define SYS_system	3003
 
-#define SYS_geterr       6001
+#define SYS_geterr	6001
+#define SYS_getcmdline	6002
 
 
 /* Define macros that generate assembly output.  */
diff --git a/libgloss/nds32/vh.h b/libgloss/nds32/vh.h
index 4ee3e8961..ca3a43f30 100644
--- a/libgloss/nds32/vh.h
+++ b/libgloss/nds32/vh.h
@@ -43,6 +43,9 @@ BREAK #SWID definition:
 #define VH_ISATTY       0x7F2B
 #define VH_SYSTEM       0x7F2C
 #define VH_GETERR       0x7F2D	/* The method we get errno.  */
+#define VH_GETPID       0x7F2E
+#define VH_KILL         0x7F2F
+#define VH_TIMES        0x7F30
 
 
 /* Define macros that generate assembly output.