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From:	"Dorel Zamfir" <dorel_z AT ics-iq DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: RHIDE debugger fails to start on board without floating point unit
Date:	Thu, 21 Feb 2002 09:09:22 -0800
Organization:	Intelligent Computer Solutions
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I tried loading the shareware version of Q87 before running the debugger and
I am now able to debug and run the program just fine.  I don't understand
why the debugger itself would require floating point support but having this
software emulator in memory seems to be a work around.

The problem now is that the shareware version of Q87 stops running after 20
minutes and requires me to reboot the PC.  Since Quickware who created Q87
is out of business I can't register the program.  If anyone knows of a way
around this problem or of another floating point emulator that will work
with 32-bit protected mode programs, please let me know.

Thanks,

Dorel Zamfir

"Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il> wrote in message
news:Pine DOT SUN DOT 3 DOT 91 DOT 1020221085218 DOT 2258E-100000 AT is...
>
> On Wed, 20 Feb 2002, Charles Sandmann wrote:
>
> > You can't use debuggers with an emulator if I remember correctly..  Does
your
> > program use floating point?  If it does not, this might work:
> >  1) SET 387=N
> >  2) Rename EMU387.DXE so it's not found.
> > See if you can debug.  I believe this should avoid all FP instructions.
>
> Unfortunately, I don't think it will work because the debugger tries to
> save the x87 state before it runs the debuggee, even if there's no x87
> (because the emulator state needs also to be saved).  Without emu387.dxe,
> the code in the debugger which does that will bomb.
>
> > If it does use floating point I think you are stuck, since the emulator
> > doesn't know how to handle floating traps in a different address space.
>
> It doesn't need to, I think: the debug support in libdbg.a should do the
> necessary footwork for it to be transparent.  This should really be fixed
> some day.

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