m68k fixes for signed 8 and 16-bit calls.

src/m68k/ffi.c

@@ -123,6 +123,8 @@ ffi_prep_args (void *stack, extended_cif *ecif)
 #define CIF_FLAGS_POINTER	32
 #define CIF_FLAGS_STRUCT1	64
 #define CIF_FLAGS_STRUCT2	128
+#define CIF_FLAGS_SINT8		256
+#define CIF_FLAGS_SINT16	512
 
 /* Perform machine dependent cif processing */
 ffi_status
@@ -200,6 +202,14 @@ ffi_prep_cif_machdep (ffi_cif *cif)
       cif->flags = CIF_FLAGS_DINT;
       break;
 
+    case FFI_TYPE_SINT16:
+      cif->flags = CIF_FLAGS_SINT16;
+      break;
+
+    case FFI_TYPE_SINT8:
+      cif->flags = CIF_FLAGS_SINT8;
+      break;
+
     default:
       cif->flags = CIF_FLAGS_INT;
       break;