Library /sys$common/syshlp/dbg$help.hlb DEBUG, Built in Symbols, %ADAEXC NAME  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    A special form of %EXC_NAME for Ada programs. In Ada, an
    exception can be raised with syntax such as "raise XXX;". In
    this case, the exception name in the operating system sense is
    just "EXCEPTION," which is what %E returns. The Ada exception
    name ("XXX") is returned by %ADAEXC_NAME.

    Example:

    DBG> SET BREAK/EXCEPTION WHEN -
    _DBG> (%ADAEXC_NAME = "XXX")