https://svnweb.freebsd.org/ports/head/devel/libffi/files/patch-src__arm__ffi.c?revision=337118&view=markup

Index: src/arm/ffi.c
--- src/arm/ffi.c.orig
+++ src/arm/ffi.c
@@ -68,6 +68,11 @@ extern unsigned char ffi_arm_trampoline[12] FFI_HIDDEN
 #include <sys/mman.h>
 #endif
 
+#ifdef __arm__
+#include <machine/sysarch.h>
+#include <stdint.h>
+#endif
+
 /* Forward declares. */
 static int vfp_type_p (const ffi_type *);
 static void layout_vfp_args (ffi_cif *);
@@ -625,6 +630,16 @@ ffi_prep_closure_loc (ffi_closure * closure,
   config[0] = closure;
   config[1] = closure_func;
 #else
+
+#ifdef __arm__
+#define __clear_cache(start, end) do {					\
+		struct arm_sync_icache_args ua;				\
+									\
+		ua.addr = (uintptr_t)(start);				\
+		ua.len = (char *)(end) - (char *)start;			\
+		sysarch(ARM_SYNC_ICACHE, &ua);				\
+	} while (0);
+#endif
 
 # if defined(FFI_EXEC_STATIC_TRAMP)
   if (ffi_tramp_is_present(closure))