🚀 go-pugleaf

In article <6860001@hp-ptp.HP.COM> barbh@hp-ptp.HP.COM (Barbara Holden) writes:
>I need to replace some of the standard functions in PMWIN.DLL with some
>handtailored ones of my own.  Is there any other way of doing besides
>generating  a new PMWIN.DLL that contains stub calls to the "real"
>PMWIN.DLL (renamed) for all non-tailored functions?
>Is the above even feasible?
>
>Comments, advice are eagerly solicited.  Thanks alot!

It is indeed feasible to generate a new PMWIN.DLL as you suggest
(I've done it for PMGPI.DLL), but there are a number of problems:

problem #1: is due to the number of exports: on OS|2 1.2 PMWIN.DLL
exports 311 functions! If you only wanted to tailor one function you
would have to write stubs for the remaining 310!

problem #2: is that the real PMWIN.DLL cannot simply be renamed,
since it has its module name embedded in its newexe header.

problem #3: is that some of the exports are not documented:
on OS|2 1.2 PMWIN.DLL exports 25 undocumented functions, for example:
	GETSCREENSELECTOR, FARCALLHOOK, STARTTIMER, ABNORMALPROCESSEXIT.
It is difficult to create stubs for undocumented functions.

I have managed to automate the process for creating such stub DLLs,
since I needed to obtain trace information from undocumented DLL functions.

solution #1: generate stubs automatically

solution #2: use objexit.exe, a sed look-alike for binary files.

solution #3: stubs pass 32 words of parameters to undocumented functions
             and then clean unused parameters from the stack

The mechanics work as follows:

dxgen c:\os2\dll\pmwin.dll
# creates pmwin.def, pmwin.c, pmwin.mk

pmwin.c can be edited to set the actual number of parameters
and trace format for known functions.

make pmwin.mk
# copies real pmwin.dll to p_win.dll and edits internal module name
# builds stub pmwin.dll which traces parameters and then calls p_win.dll
# pmwin.c can be edited to remove the functions that require special
# tailoring.


--
Derek Baum consulting at:
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