[680] in NetBSD-Development
Re: wanted: gdb that disassembles 16-bit code, and/or equivalent
daemon@ATHENA.MIT.EDU (Theodore Ts'o)
Wed Mar 15 18:06:20 1995
Date: Wed, 15 Mar 1995 18:05:28 +0500
From: "Theodore Ts'o" <tytso@MIT.EDU>
To: John Kohl <jtk@atria.com>
Cc: port-i386@netbsd.org, eichin@cygnus.com, raeburn@cygnus.com,
linux-help@MIT.EDU, netbsd-dev@MIT.EDU
In-Reply-To: John Kohl's message of Wed, 15 Mar 1995 13:42:04 -0500,
<9503151842.AA07122@banana>
Date: Wed, 15 Mar 1995 13:42:04 -0500
From: John Kohl <jtk@atria.com>
I'm hacking on dosemu/NetBSD, and I would very much like to be able to
disassemble 80x86 code that assumes it's in a 16-bit segment. gdb
appears to always assume a 32-bit segment when interpreting instructions.
This especially matters for things that use immediate constants whose
size is a function of the default operand size.
Is there a way to coerce gdb into 16-bit disassembly mode? Is there
some other tool I could use? (I'd prefer teaching gdb, since that would
let me do live debugging rather than post-mortems).
I could be wrong, but I vaguely remember someone in working with dosemu
had patches which tortured gdb enough so that it would handle 16-bit
segments. Or it have been someone working with Wine; it was a while ago
that I saw this, and my memory isn't clear. You might ask the Dosemu
people (linux-msdos@vger.rutgers.edu) or the Wine people
(comp.emulators.ms-windows.wine) to see if this rings any bells.
- Ted
