Index: head/sys/powerpc/powerpc/elf_common.c
===================================================================
--- head/sys/powerpc/powerpc/elf_common.c
+++ head/sys/powerpc/powerpc/elf_common.c
@@ -36,7 +36,22 @@
 	Elf_Auxinfo *argarray, *pos;
 	int error;
 
-	if (imgp->proc->p_osrel >= P_OSREL_POWERPC_NEW_AUX_ARGS)
+	/*
+	 * XXX If we can't find image's OSREL, assume it uses the new auxv
+	 * format.
+	 *
+	 * This is specially important for rtld, that is not tagged. Using
+	 * direct exec mode with new (ELFv2) binaries that expect the new auxv
+	 * format would result in crashes otherwise.
+	 *
+	 * Unfortunately, this may break direct exec'ing old binaries,
+	 * but it seems better to correctly support new binaries by default,
+	 * considering the transition to ELFv2 happened quite some time
+	 * ago. If needed, a sysctl may be added to allow old auxv format to
+	 * be used when OSREL is not found.
+	 */
+	if (imgp->proc->p_osrel >= P_OSREL_POWERPC_NEW_AUX_ARGS ||
+	    imgp->proc->p_osrel == 0)
 		return (__elfN(freebsd_copyout_auxargs)(imgp, base));
 
 	args = (Elf_Auxargs *)imgp->auxargs;