Date: Wed, 20 Dec 1995 16:47:03 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
To: Manfred Schiefert <manfred DOT schiefert AT aut DOT alcatel DOT at>
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu, schiefer AT aut DOT alcatel DOT at
Subject: Re: HELP: Problem with DJ gdb 412


On Wed, 20 Dec 1995, Manfred Schiefert wrote:

> calling gdb under MSDOS 6.20 alone AND also under WFW 3.11 results into:
> 
> Unsupported DOS request at eip 9003581b
> Register dump mentions:
> eax=0000fe01 ebx=7ffffe48 ecx=esi=0 edx=7ffffe4d edi=7ffffe3c
> epb=7ffffd68 esp=7ffffd60 cs=d8 ds=es=fs=ss=48 gs=38 cr2=0000b7b2
> call frame traceback EIPs
> 9003581b
> 90035aa0
> 90000b47

Please read the DJGPP FAQ list (available as faq102.zip from the same
place you get DJGPP), Chapter 12.  It describes how to invoke the debugger
correctly (``go32 -d gdb progname'').  Also note that under Windows you
need to use a DPMI version of the debugger (``go32 -d gdb-dpmi prog''). 

There is a known bug in the current DPMI version of gdb which most
probably will cause it to crash under Windows when a breakpoint is hit, 
so you'll be better off debugging with gdb outside Windows.  But the way 
it crashes for you now (Unsupported DOS request) is NOT what you'd see 
when you invoke gdb correctly under Windows.