sparc64 almost certainly has been fixed, but it hasn't been tested.

diff --git a/klibc/README b/klibc/README
index 2b4c9f1..663ec33 100644
--- a/klibc/README
+++ b/klibc/README
@@ -51,7 +51,7 @@
    s390:	 Working static, shared untested
    s390x:	 Working
    sh:		 Untested
-   sparc64:	 sigaction() fails in ash for unknown reason
+   sparc64:	 Untested
    sparc:	 Working
    v850:	 Not yet ported
    x86-64:	 Working