2014-03-21 Sabrini Ni <sabrinanitw@gmail.com>

        * nds32/Makefile.in: Alter filename.
        * nds32/syscall_argv.S: Rename to _argv.S
        * nds32/syscall_argvlen.S: Rename to _argvlen.S
        * nds32/syscall_chdir.S: Rename to _chdir.S
        * nds32/syscall_chmod.S: Rename to _chmod.S
        * nds32/syscall_close.S: Rename to _close.S
        * nds32/syscall_exit.S: Rename to _exit.S
        * nds32/syscall_fstat.S: Rename to _fstat.S
        * nds32/syscall_getpid.S: Rename to _getpid.S
        * nds32/syscall_gettimeofday.S: Rename to _gettimeofday.S
        * nds32/syscall_isatty.S: Rename to _isatty.S
        * nds32/syscall_kill.S: Rename to _kill.S
        * nds32/syscall_link.S: Rename to _link.S
        * nds32/syscall_lseek.S: Rename to _lseek.S
        * nds32/syscall_open.S: Rename to _open.S
        * nds32/syscall_read.S: Rename to _read.S
        * nds32/syscall_rename.S: Rename to _rename.S
        * nds32/syscall_sbrk.S: Rename to _sbrk.S
        * nds32/syscall_stat.S: Rename to _stat.S
        * nds32/syscall_system.S: Rename to _system.S
        * nds32/syscall_time.S: Rename to _time.S
        * nds32/syscall_times.S: Rename to _times.S
        * nds32/syscall_unlink.S: Rename to _unlink.S
        * nds32/syscall_utime.S: Rename to _utime.S
        * nds32/syscall_write.S: Rename to _write.S

1 files changed, 78 insertions, 0 deletions

diff --git a/libgloss/nds32/_sbrk.S b/libgloss/nds32/_sbrk.S
new file mode 100644
index 000000000..ae32e8dcd
--- /dev/null
+++ b/libgloss/nds32/_sbrk.S
@@ -0,0 +1,78 @@
+/*
+Copyright (c) 2013 Andes Technology Corporation.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+    Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+    The name of the company may not be used to endorse or promote
+    products derived from this software without specific prior written
+    permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED.  IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+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.
+*/
+#include "../syscall.h"
+#include "syscall_extra.h"
+
+	.extern	_impure_ptr	/* The first element is _errno.  */
+	.extern	_end
+	.global	_sbrk
+
+	.text
+	.align	2
+_sbrk:
+	/* Get the value stored in heap_end (Top of Heap). If the value is zero,
+	   initialize it with the ending of bss section and leave a 1024-byte
+	   room to do low memory action.  */
+	l.w	$r1, heap_end
+	bnez	$r1, .L0
+        /* Note: leave 1024 byte to do low memory action.  */
+	la	$r1, _end + 1024
+	s.w	$r1, heap_end
+
+.L0:
+	/* Try to increments heap_end by $r0 bytes. Check if collision happens ?
+	   If collision happens, -1 is returned and errno is set to ENOMEM.
+	   Otherwise, save new value to heap_end and return the previous
+	   heap_end. */
+
+	/* Make sure new heap_end is aligned on 8-byte boundary.  */
+	addi	$r0, $r0, 7
+	srli	$r0, $r0, 3
+	slli	$r0, $r0, 3
+
+	add	$r0, $r1, $r0	/* Set $r0 as new heap_end.  */
+	slt	$r2, $sp, $r0	/* Set $r2 if $sp is lower than heap_end.  */
+	bnez	$r2, .Lerror	/* Branch if collision happens.  */
+
+	s.w	$r0, heap_end	/* Save new value to heap_end.  */
+	move	$r0, $r1	/* Return the previous heap_end.  */
+	ret
+
+.Lerror:
+	movi	$r0, 12
+	l.w     $r15, _impure_ptr
+	swi     $r0, [$r15]     /* Set errno.  */
+	movi	$r0, -1		/* Reture value is -1.  */
+	ret
+
+	.section	.bss
+	.align	2
+heap_end:
+	.word	0