Pete Popov writes:

Hi Erik,

I'm not sure why the NIOS support is not in uClibc -- perhaps the patch
was rejected or never submitted? In any case, I'm playing with some NIOS
stuff and created this patch against 0.9.26. The work was done by
Microtronix. I'm not sure who else contributed to it. It would be great
to have the NIOS support available in uClibc so developers don't have to
go searching for these bits.

Pete

1 files changed, 46 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/nios2/brk.c b/libc/sysdeps/linux/nios2/brk.c
new file mode 100644
index 000000000..3b81e7018
--- /dev/null
+++ b/libc/sysdeps/linux/nios2/brk.c
@@ -0,0 +1,46 @@
+/* brk system call for Linux/Nios2.
+   Copyright (C) 1995, 1996, 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 <unistd.h>
+#include <sys/syscall.h>
+#include <errno.h>
+
+
+/* This must be initialized data because commons can't have aliases.  */
+void *___brk_addr = 0;
+
+
+int brk (void *addr)
+{
+    void *newbrk;
+    register int r2 asm("r2") = TRAP_ID_SYSCALL;
+    register int r3 asm("r3") = __NR_brk;
+    register void *r4 asm("r4") = addr;
+
+    asm volatile ("trap\n\t" : "=r"(newbrk) : "0"(r2), "r"(r3), "r"(r4));
+
+    ___brk_addr = newbrk;
+
+    if (newbrk < addr) {
+      __set_errno (ENOMEM);
+      return -1;
+    }
+
+    return 0;
+}