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Diffstat (limited to 'libc/sysdeps/linux/nds32/brk.c')
-rw-r--r--libc/sysdeps/linux/nds32/brk.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/nds32/brk.c b/libc/sysdeps/linux/nds32/brk.c
new file mode 100644
index 000000000..a3c38d9b8
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/brk.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* brk system call for Linux/NDS32.
+ Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <errno.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+/* This must be initialized data because commons can't have aliases. */
+void *__curbrk attribute_hidden = 0;
+
+libc_hidden_proto(brk)
+int
+brk (void *addr)
+{
+ void *newbrk;
+
+#ifdef NDS32_ABI_V0
+ __asm__ __volatile__ ("move $r0, %1 \n\t" // save the argment in r0
+ "pushm $r7, $r8 \n\t"
+ "sethi $r7, hi20(%2)\n\t" // put the syscall number in r7
+ "ori $r7, $r7, lo12(%2)\n\t"
+ "syscall 0x7fff \n\t" // do the system call
+ "popm $r7, $r8 \n\t"
+ "move %0, $r5 \n\t" // keep the return value
+ : "=r"(newbrk)
+ : "r"(addr), "i"(SYS_ify(brk))
+ : "$r0", "$r5");
+#else
+ __asm__ __volatile__ ("move $r0, %1 \n\t" // save the argment in r0
+ "syscall %2 \n\t" // do the system call
+ "move %0, $r0 \n\t" // keep the return value
+ : "=r"(newbrk)
+ : "r"(addr), "i"(SYS_ify(brk))
+ : "$r0");
+#endif
+
+ __curbrk = newbrk;
+
+ if (newbrk < addr)
+ {
+ __set_errno (ENOMEM);
+ return -1;
+ }
+
+ return 0;
+}
+libc_hidden_def(brk)