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, 49 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/nios2/clone.c b/libc/sysdeps/linux/nios2/clone.c
new file mode 100644
index 000000000..0555658b4
--- /dev/null
+++ b/libc/sysdeps/linux/nios2/clone.c
@@ -0,0 +1,49 @@
+/*
+ * libc/sysdeps/linux/nios2/clone.c -- `clone' syscall for linux/nios2
+ *
+ *  Copyright (C) 2004,05  Microtronix Datacom Ltd
+ *  Copyright (C) 2002,03  NEC Electronics Corporation
+ *  Copyright (C) 2002,03  Miles Bader <miles@gnu.org>
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License.  See the file COPYING.LIB in the main
+ * directory of this archive for more details.
+ *
+ * Written by Miles Bader <miles@gnu.org>
+ * Nios2 port by Wentao Xu
+ */
+
+#include <errno.h>
+#include <sys/syscall.h>
+
+int clone (int (*fn)(void *arg), void *child_stack, int flags, void *arg)
+{
+  register unsigned long rval asm ("r2") = -EINVAL;
+
+  if (fn && child_stack) {
+      register unsigned long syscall asm ("r3");
+      register unsigned long arg0 asm ("r4");
+      register unsigned long arg1 asm ("r5");
+
+      /* Clone this thread.  */
+      rval = TRAP_ID_SYSCALL;
+      syscall = __NR_clone;
+      arg0 = flags;
+      arg1 = (unsigned long)child_stack;
+      asm volatile ("trap "
+         : "=r" (rval), "=r" (syscall)
+         : "0" (rval),"1" (syscall), "r" (arg0), "r" (arg1)
+         );
+
+      if (rval == 0) {
+         /* In child thread, call fn and exit.  */
+         arg0 = (*fn) (arg);
+         syscall = __NR_exit;
+         asm volatile ("trap "
+          : "=r" (rval), "=r" (syscall)
+          : "1" (syscall), "r" (arg0));
+      }
+   }
+
+  __syscall_return (int, rval);
+}