Just as classic z/XDC can access dataspaces in live storage, so can dump/XDC access dataspaces contained within a dump. Also like classic z/XDC, dump/XDC uses ALETs for accessing dataspaces.
To display dataspace storage, one way is as follows:
Issue LIST DSPACES ALL to report all the dataspaces contained within a dump.
Use an F shortcut against any listed dataspace to display its origin storage (X'00001000' in this case).
Create a simple equate (X for example) to help in referencing locations within the dataspace:
- If the dspace has a zero origin, then just use EQUATE X +0 80000000 DATA
- If the dspace's origin is X'1000', then use EQUATE X -1000 80000000 DATA
Then references to X+whatever becomes an easy way to reference location whatever in the dataspace to which X has been assigned. Example: FORMAT X+11B00 displays location X'00011B00' of the dataspace.
Another way is to use the currently designated execution thread's access registers. Example:
- Suppose you've used the SET CURRENT tcbaddress (or CU shortcut) to assign the given TCB as the Current Execution Unit (CXU).
- Suppose the task's R9 points to a location within a dataspace.
- Suppose AR9 contains that dataspace's ALET.
- Then FORMAT AR9? will display that storage. (z/XDC uses the ALET that's in AR9, together with the address with R9 to access the desired storage.)
Another way is to use an address expression containing z/XDC's ~ALET() built-in function, but I'm not going to get into the details here. See HELP FUNCTIONS ALET if you would like to learn more about this.
Of course, just like in classic z/XDC, you can assign both equates and dsect maps to dataspace storage. See HELP EQUATES and HELP MAPS for the details.
