Re: debug x86 custom OS

[Jim Halfpenny <jim.halfpenny () gmail com>]

You might want to try different CPU settings for qemu until you find one
that works (see below). Try experimenting with different x86  chips, you
may get lucky. qemu -cpu pentium3 might be a good start.

Regards,
Jim

$ qemu -cpu ?
x86           [n270]
x86         [athlon]
x86       [pentium3]
x86       [pentium2]
x86        [pentium]
x86            [486]
x86        [coreduo]
x86          [kvm32]
x86         [qemu32]
x86          [kvm64]
x86       [core2duo]
x86         [phenom]
x86         [qemu64]
x86           [host]




On 18 September 2013 23:27, HaQue <admin () smartwave-wireless com> wrote:

> Thank you to all the responses so far.
> I will be looking at Qemu today.
>
> The hardware this system runs on is Intel 810e,815, 845 based motherboards
> only. basically PentiumIII and 4.
> It is very specifically written to access this hardware directly, with no
> bloat whatsoever.
>
> This is why emulation and virtualisation is so tricky.  Unless I can get
> the VM/emu to mimick these exact mainboards, Its going to crash.
>
>
> On 2013-09-18 10:30, Danilo Nascimento wrote:
>
> > Did You try to run it on qemu?
> > Qemu has the -s switch that may do what you want.
> >
> > Em terça-feira, 17 de setembro de 2013, Chris Campbell escreveu:
> >
> >  If it runs on Intel can you not run it in VMware with debugging
> > > turned on?
> > >
> > > http://wiki.osdev.org/VMware [3]
> > >
> > >
> > > --
> > > Chris Campbell
> > >
> > > On 17 September 2013 at 19:48:50, HaQue
> > > (admin () smartwave-wireless com) wrote:
> > >
> > >  Hi all,
> > > > Long time listener, first time caller.
> > > >
> > > > The hint to post here came from Intern Mikes great talk at
> > > > B-Sides.
> > > >
> > > > I am hoping that someone here can give me some pointers on how to
> > > > debug/monitor a custom OS that runs on a standard Intel mainboard.
> > > >
> > > > Basically it boots up and used the hardware directly, the Intel
> > > > chipset
> > > > and integrated video. Doesn't run on DOS, windows or Linux, is not
> > > > a
> > > > Linux or DOS "derivative or clone. It does use hardware
> > > > interrupts, and
> > > > I believe BIOS routines.
> > > >
> > > > Obviously this means custom drivers and executables (which are
> > > > very
> > > > few).
> > > >
> > > > IDA sees the driver files as "MS-DOS SYS-file(perhaps device
> > > > driver)[dos.ldw]" and I get some coherent code mentioning
> > > > interrupts,
> > > > such as Strategy_Routine, Interrupt_Routine but nothing to really
> > > > speak
> > > > of.
> > > >
> > > > I Initially thought to hook up to the serial port and monitor with
> > > >
> > > > another PC, similar to what you would do in an embedded system,
> > > > though
> > > > quickly realised that this output of dmesg Is programmed into
> > > > Linux, and
> > > > no such functionality exists in my case.
> > > >
> > > > Short of JTAG on the CPU or video, is there anything anyone could
> > > > suggest to figure out the routines?
> > > >
> > > > Is there anything on a standard Intel PC motherboard that can
> > > > help?
> > > >
> > > > All the embedded hardware hacking I have done doesn't seem to
> > > > transfer
> > > > to this, and though ripping apart the software is kind of helpful
> > > > to see
> > > > the overall picture of how the system works, I don't see how to
> > > > use the
> > > > info to interact with the OS aside from the basic, intended
> > > > functionality.
> > > >
> > > > Any tips or links to sites that may help would be great.
> > > >
> > > > Cheers,
> > > >
> > > > HaQue
> > > >
> > > > ------------------------------**-----------------------------
> > > > Is "Gone in 60 Seconds" a movie about Warranty Stickers?
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> > > >
> > > > Main Web Site: http://pauldotcom.com [2]
> > --
> > []'s Danilo Nascimento
> >
> >
> > Links:
> > ------
> > [1] 
> > http://mail.pauldotcom.com/**cgi-bin/mailman/listinfo/**pauldotcom<http://mail.pauldotcom.com/cgi-bin/mailman/listinfo/pauldotcom>
> > [2] http://pauldotcom.com
> > [3] http://wiki.osdev.org/VMware
> >
> >
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> --
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