bugcheck_code

    OpenVMS usage longword_unsigned
    type          longword (unsigned)
    access        read only
    mechanism     by value
    The bugcheck code to look up.

 buffer_ptr

    OpenVMS usage char_string
    type          character string
    access        write only
    mechanism     by reference
    Address of buffer to save bugcheck message.

 buffer_len

    OpenVMS usage longword_unsigned
    type          longword (unsigned)
    access        read only
    mechanism     by value
    Length of buffer to receive message.