code_base_va

    OpenVMS usage: address
    type:          quadword (unsigned)
    access:        read only
    mechanism:     by value
    With code_size, defines the potential code range. code_base_va
    is required for both creation and extension calls. code_base_va
    is the process virtual address of the start of the code region.
    code_size is the size of the code region in bytes. An error is
    returned if this overlaps any existing range.

 code_size

    OpenVMS usage: address
    type:          quadword (unsigned)
    access:        read only
    mechanism:     by value
    With code_base_va, defines the potential code range. code_base_va
    is required for both creation and extension calls. code_base_va
    is the process virtual address of the start of the code region.
    code_size is the size of the code region in bytes. An error is
    returned if this overlaps any existing range.

 ut_base_va

    OpenVMS usage: address
    type:          quadword (unsigned)
    access:        read only
    mechanism:     by value
    With ut_size, describes the unwind table (UT). ut_base_va is the
    process virtual address of the UT and must be quadword aligned.
    ut_size is the size of the UT in bytes and must be a multiple of
    the size (24 bytes: 3 quadwords) of an unwind table entry (UTE).
    The UTEs must describe nonoverlapping code subregions within the
    overall code region.

 ut_size

    OpenVMS usage: address
    type:          quadword (unsigned)
    access:        read only
    mechanism:     by value
    With ut_base_va, describes the unwind table (UT). ut_base_va
    is the process virtual address of the UT and must be quadword
    aligned. ut_size is the size of the UT in bytes and must be
    a multiple of the size (24 bytes: 3 quadwords) of an unwind
    table entry (UTE). The UTEs must describe nonoverlapping code
    sub regions within the overall code region.

 gp_value

    OpenVMS usage: address
    type:          quadword (unsigned)
    access:        read only
    mechanism:     by value
    Ignored on extension calls, required on create calls. The Global
    Data Pointer (GP) value for the routines described by these
    unwind tables.

 unwind_info_base

    OpenVMS usage: address
    type:          quadword (unsigned)
    access:        read only
    mechanism:     by value
    Ignored on extension calls; required on create calls. The unwind_
    info_base plus a particular UTE UIB offset must add up to the
    process virtual address of that UIB. Typically for static
    code (activated images from disk), this specifies the process
    virtual base address of the segment containing the UIBs. However,
    dynamically generated code, for example, can pass a zero for the
    unwind_info_base and have the full process virtual addresses of
    the UIBs in their UTEs.

 name

    OpenVMS usage: pseudo-image-name
    type:          character-code-text-string
    access:        read only
    mechanism:     by descriptor-fixed-length string descriptor
    Passed by descriptor (ignored on extension calls). May be used
    for traceback. Need not be unique. Should be less than 255
    characters (will be truncated, otherwise).