(I64 only.) The Find Address of Unwind Information Block
    Language-Specific Data routine finds the address of the unwind
    information block language-specific data area.

    Format

      LIB$I64_GET_UNWIND_LSDA   pc_value, unwind_lsda_p

1 - Returns

    OpenVMS usage:cond_value
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value

2 - Arguments

 pc_value

    OpenVMS usage:PC value
    type:         quadword
    access:       read
    mechanism:    by reference

    Address of a quadword to receive the address of the language-
    specific data area, if there is one.

 unwind_lsda_p

    OpenVMS usage:address
    type:         quadword
    access:       write
    mechanism:    by reference

    Address of a location that contains the PC value. pc_value
    is used to find the unwind information block and the unwind
    information block language-specific data area address.