Add support for the Analog Devices Blackfin mmuless processor

1 files changed, 39 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/bfin/clone.c b/libc/sysdeps/linux/bfin/clone.c
new file mode 100644
index 000000000..746da8e22
--- /dev/null
+++ b/libc/sysdeps/linux/bfin/clone.c
@@ -0,0 +1,39 @@
+/*
+ * libc/sysdeps/linux/bfin/clone.c -- `clone' syscall for linux/blackfin
+ *
+ *
+ * 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.
+ *
+ */
+
+#include <asm/unistd.h>
+
+int
+clone (int (*fn)(void *arg), void *child_stack, int flags, void *arg)
+{
+	register long rval = -1;
+
+	if (fn && child_stack) {
+
+	__asm__ __volatile__ (
+			"r1 = %2;"
+			"r0 = %3;"
+			"P0 = %1;"
+			"excpt 0;"	 /*Call sys_clone*/
+			"%0  = r0;"
+			"cc = r0 == 0;"
+			"if !cc jump xxx;"	/* if (rval != 0) skip to parent */
+			"r0 = %4;"
+			"p0 = %5;"
+			"call (p0);"	/* Call cloned function */
+			"p0 = %6;"
+			"excpt 0;"	/* Call sys_exit */
+			"xxx: nop;"
+			: "=d" (rval)
+			: "i" (__NR_clone), "a" (child_stack), "a" (flags), "a" (arg), "a" (fn), "i" (__NR_exit)
+			: "CC", "R0", "R1", "P0");
+	}
+	return rval;
+}