Commit what we need for libretro-common

libretro/libretro-common/libco/genode.cpp

@@ -0,0 +1,29 @@
+/*
+  libco.genode_secondary_stack (2018-09-15)
+  author: Emery Hemingway
+  license: public domain
+*/
+
+/* Genode include */
+#include <base/thread.h>
+
+/* Libco include */
+#include <libco.h>
+
+extern "C"
+void *genode_alloc_secondary_stack(unsigned long stack_size)
+{
+	try {
+		return Genode::Thread::myself()->alloc_secondary_stack("libco", stack_size); }
+	catch (...) {
+		Genode::error("libco: failed to allocate ", stack_size, " byte secondary stack");
+		return nullptr;
+	}
+
+}
+
+extern "C"
+void genode_free_secondary_stack(void *stack)
+{
+	Genode::Thread::myself()->free_secondary_stack(stack);
+}