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* libgloss/nds32/_exit.S: Finish with an infinite loop in _exit.

Browse Source 
* 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.
This commit is contained in:
Corinna Vinschen 2014-12-15 13:30:07 +00:00
parent 0cbcde7bdb
commit d4ef8a6368
13 changed files with 285 additions and 81 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
libgloss/ChangeLog
View File

@ -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> 2014-12-11 Anthony Green <green@moxielogic.com>
* moxie/configure: Rebuilt. * moxie/configure: Rebuilt.

20
libgloss/nds32/_exit.S
View File

@ -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 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/ */
#ifdef __NDS32_VH__
#include "vh.h" #include "vh.h"
.extern _impure_ptr
TYPE3 _exit, VH_EXIT
#else /* not __NDS32_VH__ */
#include "../syscall.h" #include "../syscall.h"
#include "syscall_extra.h" .text
.section .text
.global _exit .global _exit
.type _exit, @function .type _exit, @function
.align 2 .align 2
_exit: _exit:
#ifdef __NDS32_VH__
BREAK VH_EXIT /* Generate_Exception(Breakpoint); */
#else
syscall SYS_exit /* Make syscall 'SYS_exit'. */ syscall SYS_exit /* Make syscall 'SYS_exit'. */
#endif
.L_infinite_loop:
b .L_infinite_loop
.size _exit, .-_exit .size _exit, .-_exit
#endif /* not __NDS32_VH__ */

17
libgloss/nds32/_getpid.S
View File

@ -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. SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/ */
#ifndef __NDS32_VH__ .text
.global _getpid
#include "../syscall.h" .type _getpid, @function
#include "syscall_extra.h" .align 2
SYS_WRAPPER _getpid, SYS_getpid _getpid:
/* The getpid() function shall always be successful and
#endif /* not __NDS32_VH__ */ no return value is reserved to indicate an error. */
movi $r0, 1 /* A minimal implementation, success. */
ret
.size _getpid, .-_getpid

10
libgloss/nds32/_gettimeofday.S
View File

@ -30,13 +30,19 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifdef __NDS32_VH__ #ifdef __NDS32_VH__
#include "vh.h" #include "vh.h"
.extern _impure_ptr
TYPE3 _gettimeofday, VH_GETTIMEOFDAY TYPE3 _gettimeofday, VH_GETTIMEOFDAY
#else /* not __NDS32_VH__ */ #else /* not __NDS32_VH__ */
#include "../syscall.h" #include "../syscall.h"
#include "syscall_extra.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__ */ #endif /* not __NDS32_VH__ */

26
libgloss/nds32/_isatty.S
View File

@ -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 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 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__ #ifdef __NDS32_VH__
#include "vh.h" #include "vh.h"
@ -37,6 +46,21 @@ TYPE0 _isatty, VH_ISATTY
#include "../syscall.h" #include "../syscall.h"
#include "syscall_extra.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__ */ #endif /* not __NDS32_VH__ */

25
libgloss/nds32/_kill.S
View File

@ -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 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/ */
/* Upon successful completion, 0 shall be returned. Otherwise,
#ifndef __NDS32_VH__ -1 shall be returned and errno set to indicate the error. */
.extern _impure_ptr /* The first element is _errno. */
#include "../syscall.h" .text
#include "syscall_extra.h" .global _kill
SYS_WRAPPER _kill, SYS_kill .type _kill, @function
.align 2
#endif /* not __NDS32_VH__ */ _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

23
libgloss/nds32/_link.S
View File

@ -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 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/ */
#ifndef __NDS32_VH__ /* Upon successful completion, 0 shall be returned. Otherwise,
-1 shall be returned and errno set to indicate the error. */
#include "../syscall.h" .extern _impure_ptr /* The first element is _errno. */
#include "syscall_extra.h" .text
SYS_WRAPPER _link, SYS_link .global _link
.type _link, @function
#endif /* not __NDS32_VH__ */ .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

23
libgloss/nds32/_times.S
View File

@ -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 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/ */
#ifndef __NDS32_VH__ /* If times() fails, (clock_t)-1 shall be returned and errno set
to indicate the error. */
#include "../syscall.h" .extern _impure_ptr /* The first element is _errno. */
#include "syscall_extra.h" .text
SYS_WRAPPER _times, SYS_times .global _times
.type _times, @function
#endif /* not __NDS32_VH__ */ .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

2
libgloss/nds32/_unlink.S
View File

@ -32,7 +32,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "vh.h" #include "vh.h"
.extern _impure_ptr .extern _impure_ptr
TYPE1 _lseek, VH_LSEEK TYPE1 _unlink, VH_UNLINK
#else /* not __NDS32_VH__ */ #else /* not __NDS32_VH__ */

94
libgloss/nds32/crt0.S
View File

@ -36,6 +36,8 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
## ##
##============================================================================== ##==============================================================================
#include "syscall_extra.h"
##------------------------------------------------------------------------------ ##------------------------------------------------------------------------------
## Vector table setup ## Vector table setup
##------------------------------------------------------------------------------ ##------------------------------------------------------------------------------
@ -47,6 +49,11 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##------------------------------------------------------------------------------ ##------------------------------------------------------------------------------
.section .text .section .text
.weak _SDA_BASE_ .weak _SDA_BASE_
.weak _ITB_BASE_
.weak _arg_init
.weak __pre_c_init
.weak __post_c_init
.weak _call_exit
.global _start .global _start
.type _start, @function .type _start, @function
.align 2 .align 2
@ -60,8 +67,22 @@ _start:
determined by Linker. SDA stands for Small Data Access. */ determined by Linker. SDA stands for Small Data Access. */
la $gp, _SDA_BASE_ 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: .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. */ in linker script. Make sure $sp is 8-byte aligned. */
la $sp, _stack la $sp, _stack
#if __NDS32_ISA_V3__ #if __NDS32_ISA_V3__
@ -71,23 +92,33 @@ _start:
and $sp, $sp, $r0 and $sp, $sp, $r0
#endif #endif
#if __NDS32_EX9_EXT__ #if __NDS32_EXT_FPU_SP__ || __NDS32_EXT_FPU_DP__
.L_init_itb: .L_init_fpu:
/* Initialization for Instruction Table Base (ITB). /* Initialize FPU
The symbol $_ITB_BASE_ is determined by Linker. Set FUCOP_CTL.CP0EN (fucpr.b'0). */
Set $ITB only if MSC_CFG.EIT (cr4.b'24) is set. */ mfsr $r0, $FUCOP_CTL
mfsr $r0, $MSC_CFG ori $r0, $r0, 0x1
srli $r0, $r0, 24 mtsr $r0, $FUCOP_CTL
andi $r0, $r0, 0x1 dsb
beqz $r0, .L_zero_out_bss /* Fall through ? */ /* According to [bugzilla #9425], set flush-to-zero mode.
la $r0, $_ITB_BASE_ That is, set $FPCSR.DNZ(b'12) = 1. */
mtusr $r0, $ITB FMFCSR $r0
ori $r0, $r0, 0x1000
FMTCSR $r0
dsb
#endif #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: .L_zero_out_bss:
/* Zero out the bss section. /* Zero out the bss section.
Equivalence C code for follow part: 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; unsinged int *ptr = _edata;
while (ptr != _end) while (ptr != _end)
*ptr++ = 0 *ptr++ = 0
@ -98,21 +129,52 @@ _start:
la $r0, _edata la $r0, _edata
la $r1, _end la $r1, _end
movi $r2, #0 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: .Lword_clear:
swi.bi $r2, [$r0], #4 swi.bi $r2, [$r0], #4
bne $r0, $r1, .Lword_clear 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. /* Prepare argc/argv/env for main function.
Since there is no operating system so far, 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 line 84. */ Note: $r2 already set to zero in .L_zero_out_bss: code fragment. */
movi $r0, 0 movi $r0, 0
movi $r1, 0 movi $r1, 0
movi $r2, 0
.L_call_main:
/* Call 'main'. */ /* Call 'main'. */
bal 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: .L_terminate_program:
/* There are two ways to terminate program: /* There are two ways to terminate program:
1. User "syscall 0x1" directly. 1. User "syscall 0x1" directly.

96
libgloss/nds32/crt1.S
View File

@ -36,6 +36,8 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
## ##
##============================================================================== ##==============================================================================
#include "syscall_extra.h"
##------------------------------------------------------------------------------ ##------------------------------------------------------------------------------
## Vector table setup ## Vector table setup
##------------------------------------------------------------------------------ ##------------------------------------------------------------------------------
@ -47,6 +49,11 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
##------------------------------------------------------------------------------ ##------------------------------------------------------------------------------
.section .text .section .text
.weak _SDA_BASE_ .weak _SDA_BASE_
.weak _ITB_BASE_
.weak _arg_init
.weak __pre_c_init
.weak __post_c_init
.weak _call_exit
.global _start .global _start
.type _start, @function .type _start, @function
.align 2 .align 2
@ -60,8 +67,22 @@ _start:
determined by Linker. SDA stands for Small Data Access. */ determined by Linker. SDA stands for Small Data Access. */
la $gp, _SDA_BASE_ 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: .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. */ in linker script. Make sure $sp is 8-byte aligned. */
la $sp, _stack la $sp, _stack
#if __NDS32_ISA_V3__ #if __NDS32_ISA_V3__
@ -71,19 +92,29 @@ _start:
and $sp, $sp, $r0 and $sp, $sp, $r0
#endif #endif
#if __NDS32_EX9_EXT__ #if __NDS32_EXT_FPU_SP__ || __NDS32_EXT_FPU_DP__
.L_init_itb: .L_init_fpu:
/* Initialization for Instruction Table Base (ITB). /* Initialize FPU
The symbol $_ITB_BASE_ is determined by Linker. Set FUCOP_CTL.CP0EN (fucpr.b'0). */
Set $ITB only if MSC_CFG.EIT (cr4.b'24) is set. */ mfsr $r0, $FUCOP_CTL
mfsr $r0, $MSC_CFG ori $r0, $r0, 0x1
srli $r0, $r0, 24 mtsr $r0, $FUCOP_CTL
andi $r0, $r0, 0x1 dsb
beqz $r0, .L_zero_out_bss /* Fall through ? */ /* According to [bugzilla #9425], set flush-to-zero mode.
la $r0, $_ITB_BASE_ That is, set $FPCSR.DNZ(b'12) = 1. */
mtusr $r0, $ITB FMFCSR $r0
ori $r0, $r0, 0x1000
FMTCSR $r0
dsb
#endif #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: .L_zero_out_bss:
/* Zero out the bss section. /* Zero out the bss section.
Equivalence C code for follow part: Equivalence C code for follow part:
@ -97,28 +128,61 @@ _start:
*/ */
la $r0, _edata la $r0, _edata
la $r1, _end la $r1, _end
beq $r0, $r1, .L_call_main /* Branch if no bss. */
movi $r2, #0 movi $r2, #0
beq $r0, $r1, .L_cpp_init /* Branch if no bss. */
.Lword_clear: .Lword_clear:
swi.bi $r2, [$r0], #4 swi.bi $r2, [$r0], #4
bne $r0, $r1, .Lword_clear bne $r0, $r1, .Lword_clear
.L_call_main: .L_cpp_init:
/* Call '_init' to invoke constructors. */ /* Call '_init' to invoke constructors. */
jal _init jal _init
/* Register '_fini' into atexit() to invoke destructors when /* Register '_fini' into atexit() to invoke destructors when
exit() has been reached. */ exit() has been reached. */
la $r0, _fini la $r0, _fini
jal atexit 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. /* Prepare argc/argv/env for main function.
Since there is no operating system so far, 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 $r0, 0
movi $r1, 0 movi $r1, 0
movi $r2, 0 movi $r2, 0
.L_call_main:
/* Call 'main'. */ /* Call 'main'. */
bal 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: .L_terminate_program:
/* There are two ways to terminate program: /* There are two ways to terminate program:
1. User "syscall 0x1" directly. 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, 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 but aware that general exit() will do some cleanup procedures
which may result in large-memory-footprints. */ which may result in large-memory-footprints. */
bal exit bal exit
.L_forever_loop: .L_forever_loop:

9
libgloss/nds32/syscall_extra.h
View File

@ -32,11 +32,12 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
/* These are additional syscalls for nds32 target. */ /* These are additional syscalls for nds32 target. */
#define SYS_rename 3001 #define SYS_rename 3001
#define SYS_isatty 3002 #define SYS_isatty 3002
#define SYS_system 3003 #define SYS_system 3003
#define SYS_geterr 6001 #define SYS_geterr 6001
#define SYS_getcmdline 6002
/* Define macros that generate assembly output. */ /* Define macros that generate assembly output. */

3
libgloss/nds32/vh.h
View File

@ -43,6 +43,9 @@ BREAK #SWID definition:
#define VH_ISATTY 0x7F2B #define VH_ISATTY 0x7F2B
#define VH_SYSTEM 0x7F2C #define VH_SYSTEM 0x7F2C
#define VH_GETERR 0x7F2D /* The method we get errno. */ #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. /* Define macros that generate assembly output.