On 2018-11-30 4:01 AM, Farley, Peter x23353 wrote:
The PDS/E directory entry for a program contains, among other information, the
EPA offset within the program.
The EPA offset is also contained in the SMDE/PMAR information returned by
DESERV.
After much RTFM however, I cannot seem to find anywhere in the Binder API data
areas an indication of which section/label is the entry point for the program.
In particular, I would have expected that an LD entry in the ESD table would
contain such an indicator, but I do not see one anywhere.
Wasn't PDS/E the first commercial version of free PDS command?
PDS/E was later renamed PDSTOOLS and then StarTool, IIRC.
Both a PDS and a PDSE program member directory entry contain the EPA
offset. Typically the EPA is chosen from label and section ESDs because
it matches a real or alias member name, or was explicitly named on a
Binder ENTRY statement, or was some sort of default.
I think that no change is made to the relevant external symbol's
recorded details as a result of being selected to be the entry point.
Often a tool will report one of several symbols with matching offsets as
the entry point simply because it was the first symbol found which had
the correct offset, even if the reason the entry point was chosen was
because of another symbol at the same offset address.
I'll propose that it's a bit like a NOTE list TTR stored in the
directory entry. Such a TTR may record the location of an "important"
block within the member, but the block itself is not changed simply
because something recorded its location.
Cheers,
Greg P.
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