Revert "Revert "Handle exceptions.""

This reverts commit 81334588b1ccc9ce36ee5b95d38950d5e4dbb8f2.

Reason for revert: Relanding original change with fix.

Bug: 223166344
Test: Ran unprotected VM under crosvm.
Change-Id: Ia1a73afef6df10a8fecec8321233b4d8855329be
diff --git a/pvmfw/Android.bp b/pvmfw/Android.bp
index fbdd8d7..3f6cca4 100644
--- a/pvmfw/Android.bp
+++ b/pvmfw/Android.bp
@@ -28,6 +28,7 @@
     name: "pvmfw",
     srcs: [
         "entry.S",
+        "exceptions.S",
         "idmap.S",
     ],
     static_libs: [