How can I generate the aarch32.ad for building hotspot?

[Z.W]

Hi,
       I want to cross-compile OpenJDK-jdk8u for aarch32. When I run make, it complains need 'aarch32.ad' and stop compile.
But I find other cpu's adfiles under the src/cpu/xxx/vm directory.
      How can I generate the 'aarch32.ad'?


Best,
ZhengWei