Basic VM and other minor improvements.

Not complete, probably not fully debugged or optimized.

lib/syslib/vm_push_sig.c

@@ -0,0 +1,20 @@
+
+#include "syslib.h"
+
+#include <minix/vm.h>
+
+/*===========================================================================*
+ *                                vm_push_sig			     *
+ *===========================================================================*/
+PUBLIC int vm_push_sig(endpoint_t ep, vir_bytes *old_sp)
+{
+    message m;
+    int result;
+
+    m.VMPS_ENDPOINT = ep;
+    result = _taskcall(VM_PROC_NR, VM_PUSH_SIG, &m);
+    *old_sp = (vir_bytes)  m.VMPS_OLD_SP;
+
+    return result;
+}
+