Some General PB/DOS ASM Questions

[Clay Clear]

(1) is this safe (or functional)? Having a SUB thus in my
include-in-everything-INC file:

SUB GetDS ()
    ! push ss
    ! pop ds
END SUB
 
SUB GetES ()
    ! push ss
    ! pop es
END SUB

...or would such tactics only work if the ASM code were physically
located in each UNIT's proceures?

(2) is there a way, I presume it would be with a DOS interrupt service,
to allocate memory to an EXE (from within a UNIT procedure), and
have the procedure directly access it? What I mean is, to duplicate
the functionality of the Win32 "HeapAlloc()" API? If there is a DOS
service that does this, then do not go to the trouble of spelling it
out for me, as I can do the research, myself. A simple "yes" or "no"
will be sufficient.

Thank you for any replies.


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[Tom Hanlin]

1. No. Registers must be preserved across SUB or FUNCTION boundaries.
The state needs to be the same when you exit a SUB as when you entered it.

2. Yes.

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Tom Hanlin
PowerBASIC Staff