Index: sys/arm/arm/vm_machdep.c
===================================================================
--- sys/arm/arm/vm_machdep.c
+++ sys/arm/arm/vm_machdep.c
@@ -56,6 +56,7 @@
 #include <sys/sysctl.h>
 #include <sys/sysent.h>
 #include <sys/unistd.h>
+#include <sys/errno.h>
 
 #include <machine/cpu.h>
 #include <machine/frame.h>
@@ -219,7 +219,13 @@
 		/* nothing to do */
 		break;
 	default:
-		frame->tf_r0 = error;
+		if (td->td_proc->p_sysent->sv_errsize) {
+			if (error >= td->td_proc->p_sysent->sv_errsize)
+				error = -1;	/* XXX */
+			else
+				error = td->td_proc->p_sysent->sv_errtbl[error];
+		}
+                frame->tf_r0 = error;
 		frame->tf_spsr |= PSR_C;    /* carry bit */
 		break;
 	}