Re: [RFC] New info command for win32 native target

Eli Zaretskii
2002-02-06T12:27:17Z

On Wed, 6 Feb 2002, Pierre Muller wrote:

> > - I think it's a good idea to make the format used to print the segment
> > as similar as possible to the one used by "info dos ..." commands;
>
> I didn't find any command that can display individual selector info

"info dos ldt $ds" will display the entry for DS selector's segment.
It's in the manual.

> and
> "(gdb) inf dos ldt" gives
> "LDT is present (at 0xc0000), but unreadable by GDB."
> on my win2000 box

Yes, all versions of Windows NT family don't let programs access the
descriptor tables, even for reading.

> so I can't really try to get closer to the go32 output.
> Could you please send go32 specific output?

There are examples in the GDB manual which show that, and the code is in
go32-nat.c. If the manual examples are not enough, please ask for
examples of specific commands, and I will send the output.

> > - why do you only print CS, DS, and FS if no argument is given? why not
> > all of the segment registers? I think at least SS and GS might be
> > interesting
>
> Simply because in my experience, I always saw that
> ds,es and ss are equal and that gs contains zero that is a special
> selector ment to create SIGSEGV if used.

I don't think it's a good idea to make decisions based on what you see in
a normal Windows program. Some programmer could do unconventional things
to segment registers, perhaps in assembly or some other way, and that's
when they will need to see them.