Date: Mon, 14 Mar 94 10:38:43 EST
From: peprbv AT cfa0 DOT harvard DOT edu (Bob Babcock)
To: terra AT diku DOT dk
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: Re: How do you debug a debugger?
Reply-To: babcock AT cfa DOT harvard DOT edu

> You're welcome -- version 1.00 is due "very soon now" featuring a lot
> of extensions.  I'll try to add your corrections also.

I looked a little more at the problem with sleep(1).  As far as I can tell,
the problem is in gettimeofday() in gettimeo.s.  This just sets al=4 and
jumps to turbo_assist which expects ebx and ecx to contain valid pointers or
zero.  Unless I'm missing something, the contents of ebx and ecx are random
at this point.

I still don't understand the change I made in read.s.

I noticed a few cosmetic problems.  Long source lines overwrite the adjacent
window and error messages at the top of the screen don't get cleared.  (For
example, hit control-g and enter an unknown name.)  It might be easier to
read the screen if you displayed the C source and disassembly in different
colors.

The manual should say that you invoke the debugger by
   go32 -d sallyxxx filename
This isn't obvious for a first-time user.

If you really want to look like the Turbo Debugger, you need to interchange
the order of operands in the disassembly.  <maybe there should be a smiley
here> I don't know if doing this would be easy or hard, but I do have
problems switching between src,dest and dest,src order depending on what I'm
debugging.